ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES

Abstract

Provided is a compound comprising a first ligand LA having a structure of Formula I,

Description

FIELD

The present disclosure generally relates to novel organometallic compounds and formulations and their various uses including as emitters in devices such as organic light emitting diodes and related electronic devices.

BACKGROUND

Opto-electronic devices that make use of organic materials are becoming increasingly desirable for various reasons. Many of the materials used to make such devices are relatively inexpensive, so organic opto-electronic devices have the potential for cost advantages over inorganic devices. In addition, the inherent properties of organic materials, such as their flexibility, may make them well suited for particular applications such as fabrication on a flexible substrate. Examples of organic opto-electronic devices include organic light emitting diodes/devices (OLEDs), organic phototransistors, organic photovoltaic cells, and organic photodetectors. For OLEDs, the organic materials may have performance advantages over conventional materials.

OLEDs make use of thin organic films that emit light when voltage is applied across the device. OLEDs are becoming an increasingly interesting technology for use in applications such as flat panel displays, illumination, and backlighting.

One application for phosphorescent emissive molecules is a full color display. Industry standards for such a display call for pixels adapted to emit particular colors, referred to as “saturated” colors. In particular, these standards call for saturated red, green, and blue pixels. Alternatively, the OLED can be designed to emit white light. In conventional liquid crystal displays emission from a white backlight is filtered using absorption filters to produce red, green and blue emission. The same technique can also be used with OLEDs. The white OLED can be either a single emissive layer (EML) device or a stack structure. Color may be measured using CIE coordinates, which are well known to the art.

SUMMARY

In one aspect, a compound comprising a first ligand L_A having a structure of Formula I,

is provided. In Formula I: moiety A is a monocyclic ring or a polycyclic fused ring system, where the monocyclic ring and each ring of the polycyclic fused ring system is independently a 5-membered or 6-membered carbocyclic or heterocyclic ring; K is selected from the group consisting of a direct bond, O, S, N(R^α), P(R^α), B(R^α), C(R^α)(R^β), and Si(R^α)(R^β); each of Z¹ and Z² is independently C or N; each of X¹ to X⁸ is independently C or N; Y is selected from the group consisting of BR, BRR′, NR, PR, P(O)R, O, S, Se, C═O, C═S, C═Se, C═NR′, C═CR′R″, S═O, SO₂, CR, CRR′, SiRR′, and GeRR′; each of R¹, R², and R³ independently represents mono to the maximum allowable substitution, or no substitutions; at least one R² or R³ is a substituted 5-membered heterocyclic ring, unsubstituted 5-membered heterocyclic ring, substituted 6-membered heterocyclic ring, unsubstituted 6-membered heterocyclic ring, or is a moiety comprising a substituent selected from the group consisting of the structures in the following Electron-Withdrawing Group List (EWG List): COR^R, CHO, COOR^R, NO₂, SF₃, SiF₃, PF₄, SF₅, OCF₃, SCF₃, SeCF₃, SOCF₃, SeOCF₃, SO₂F, SO₂CF₃, SeO₂CF₃, OSeO₂CF₃, OCN, SCN, SeCN, ⁺N(R^R)₃, (R^R)₂CCN, (R^R)₂CCF₃, CNC(CF₃)₂, BR^RR^R′, substituted or unsubstituted dibenzoborole, substituted or unsubstituted carbazole, substituted or unsubstituted oxazole, substituted or unsubstituted benzoxazole, substituted or unsubstituted thiazole, substituted or unsubstituted benzothiazole, substituted or unsubstituted imidazole, substituted or unsubstituted benzimidazole, ketone, carboxylic acid, ester, nitrile, isonitrile, sulfinyl, sulfonyl, partially or fully fluorinated alkyl, partially or fully fluorinated alkenyl, partially or fully fluorinated cycloalkyl, partially or fully fluorinated aryl, partially or fully fluorinated heteroaryl, cyano-containing alkyl, cyano-containing alkenyl, cyano-containing cycloalkyl, cyano-containing aryl, cyano-containing heteroaryl, isocyanate, and combinations thereof;

each R^α, R^β, R^R, R^R′, R, R′, R″, R¹, R², and R³ is independently hydrogen or a substituent selected from the group consisting of the General Substituents defined herein; L_A is coordinated to a metal M selected from the group consisting of Ir, Rh, Re, Ru, Os, Pt, Pd, Ag, Au, and Cu; metal M may be coordinated to other ligands; L_A may be joined with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand; wherein any two substituents may be joined or fused to form a ring.

In another aspect, the present disclosure provides a formulation comprising a compound having a first ligand L_A of Formula I as described herein.

In yet another aspect, the present disclosure provides an OLED having an organic layer comprising a compound having a first ligand L_A of Formula I as described herein.

In yet another aspect, the present disclosure provides a consumer product comprising an OLED with an organic layer comprising a compound having a first ligand L_A of Formula I as described herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an organic light emitting device.

FIG. 2 shows an inverted organic light emitting device that does not have a separate electron transport layer.

DETAILED DESCRIPTION

A. Terminology

Unless otherwise specified, the below terms used herein are defined as follows:

As used herein, the term “organic” includes polymeric materials as well as small molecule organic materials that may be used to fabricate organic opto-electronic devices. “Small molecule” refers to any organic material that is not a polymer, and “small molecules” may actually be quite large. Small molecules may include repeat units in some circumstances. For example, using a long chain alkyl group as a substituent does not remove a molecule from the “small molecule” class. Small molecules may also be incorporated into polymers, for example as a pendent group on a polymer backbone or as a part of the backbone. Small molecules may also serve as the core moiety of a dendrimer, which consists of a series of chemical shells built on the core moiety. The core moiety of a dendrimer may be a fluorescent or phosphorescent small molecule emitter. A dendrimer may be a “small molecule,” and it is believed that all dendrimers currently used in the field of OLEDs are small molecules.

As used herein, “top” means furthest away from the substrate, while “bottom” means closest to the substrate. Where a first layer is described as “disposed over” a second layer, the first layer is disposed further away from substrate. There may be other layers between the first and second layer, unless it is specified that the first layer is “in contact with” the second layer. For example, a cathode may be described as “disposed over” an anode, even though there are various organic layers in between.

As used herein, “solution processable” means capable of being dissolved, dispersed, or transported in and/or deposited from a liquid medium, either in solution or suspension form.

A ligand may be referred to as “photoactive” when it is believed that the ligand directly contributes to the photoactive properties of an emissive material. A ligand may be referred to as “ancillary” when it is believed that the ligand does not contribute to the photoactive properties of an emissive material, although an ancillary ligand may alter the properties of a photoactive ligand.

As used herein, and as would be generally understood by one skilled in the art, a first “Highest Occupied Molecular Orbital” (HOMO) or “Lowest Unoccupied Molecular Orbital” (LUMO) energy level is “greater than” or “higher than” a second HOMO or LUMO energy level if the first energy level is closer to the vacuum energy level. Since ionization potentials (IP) are measured as a negative energy relative to a vacuum level, a higher HOMO energy level corresponds to an IP having a smaller absolute value (an IP that is less negative). Similarly, a higher LUMO energy level corresponds to an electron affinity (EA) having a smaller absolute value (an EA that is less negative). On a conventional energy level diagram, with the vacuum level at the top, the LUMO energy level of a material is higher than the HOMO energy level of the same material. A “higher” HOMO or LUMO energy level appears closer to the top of such a diagram than a “lower” HOMO or LUMO energy level.

As used herein, and as would be generally understood by one skilled in the art, a first work function is “greater than” or “higher than” a second work function if the first work function has a higher absolute value. Because work functions are generally measured as negative numbers relative to vacuum level, this means that a “higher” work function is more negative. On a conventional energy level diagram, with the vacuum level at the top, a “higher” work function is illustrated as further away from the vacuum level in the downward direction. Thus, the definitions of HOMO and LUMO energy levels follow a different convention than work functions.

The terms “halo,” “halogen,” and “halide” are used interchangeably and refer to fluorine, chlorine, bromine, and iodine.

The term “acyl” refers to a substituted carbonyl radical (C(O)—R_s).

The term “ester” refers to a substituted oxycarbonyl (—O—C(O)—R_s or —C(O)—O—R_s) radical.

The term “ether” refers to an —OR_s radical.

The terms “sulfanyl” or “thio-ether” are used interchangeably and refer to a —SR_s radical.

The term “selenyl” refers to a —SeR_s radical.

The term “sulfinyl” refers to a —S(O)—R_s radical.

The term “sulfonyl” refers to a —SO₂—R_s radical.

The term “phosphino” refers to a —P(R_s)₂ radical, wherein each R, can be same or different.

The term “silyl” refers to a —Si(R_s)₃ radical, wherein each R, can be same or different.

The term “germyl” refers to a —Ge(R_s)₃ radical, wherein each R, can be same or different.

The term “boryl” refers to a —B(R_s)₂ radical or its Lewis adduct —B(R_s)₃ radical, wherein R_s can be same or different.

In each of the above, R_s can be hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aiylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, and combination thereof. Preferred R_s is selected from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl, and combination thereof.

The term “alkyl” refers to and includes both straight and branched chain alkyl radicals. Preferred alkyl groups are those containing from one to fifteen carbon atoms and includes methyl, ethyl, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, 2,2-dimethylpropyl, and the like. Additionally, the alkyl group may be optionally substituted.

The term “cycloalkyl” refers to and includes monocyclic, polycyclic, and spiro alkyl radicals. Preferred cycloalkyl groups are those containing 3 to 12 ring carbon atoms and includes cyclopropyl, cyclopentyl, cyclohexyl, bicyclo[3.1.1]heptyl, spiro[4.5]decyl, spiro[5.5]undecyl, adamantyl, and the like. Additionally, the cycloalkyl group may be optionally substituted.

The terms “heteroalkyl” or “heterocycloalkyl” refer to an alkyl or a cycloalkyl radical, respectively, having at least one carbon atom replaced by a heteroatom. Optionally the at least one heteroatom is selected from O, S, N, P, B, Si and Se, preferably, O, S or N. Additionally, the heteroalkyl or heterocycloalkyl group may be optionally substituted.

The term “alkenyl” refers to and includes both straight and branched chain alkene radicals. Alkenyl groups are essentially alkyl groups that include at least one carbon-carbon double bond in the alkyl chain. Cycloalkenyl groups are essentially cycloalkyl groups that include at least one carbon-carbon double bond in the cycloalkyl ring. The term “heteroalkenyl” as used herein refers to an alkenyl radical having at least one carbon atom replaced by a heteroatom. Optionally the at least one heteroatom is selected from O, S, N, P, B, Si, and Se, preferably, O, S, or N. Preferred alkenyl, cycloalkenyl, or heteroalkenyl groups are those containing two to fifteen carbon atoms. Additionally, the alkenyl, cycloalkenyl, or heteroalkenyl group may be optionally substituted.

The term “alkynyl” refers to and includes both straight and branched chain alkyne radicals. Alkynyl groups are essentially alkyl groups that include at least one carbon-carbon triple bond in the alkyl chain. Preferred alkynyl groups are those containing two to fifteen carbon atoms. Additionally, the alkynyl group may be optionally substituted.

The terms “aralkyl” or “arylalkyl” are used interchangeably and refer to an alkyl group that is substituted with an aryl group. Additionally, the aralkyl group may be optionally substituted.

The term “heterocyclic group” refers to and includes aromatic and non-aromatic cyclic radicals containing at least one heteroatom. Optionally the at least one heteroatom is selected from O, S, N, P, B, Si, and Se, preferably, O, S, or N. Hetero-aromatic cyclic radicals may be used interchangeably with heteroaryl. Preferred hetero-non-aromatic cyclic groups are those containing 3 to 7 ring atoms which includes at least one hetero atom, and includes cyclic amines such as morpholino, piperidino, pyrrolidino, and the like, and cyclic ethers/thio-ethers, such as tetrahydrofuran, tetrahydropyran, tetrahydrothiophene, and the like. Additionally, the heterocyclic group may be optionally substituted.

The term “aryl” refers to and includes both single-ring aromatic hydrocarbyl groups and polycyclic aromatic ring systems. The polycyclic rings may have two or more rings in which two carbons are common to two adjoining rings (the rings are “fused”) wherein at least one of the rings is an aromatic hydrocarbyl group, e.g., the other rings can be cycloalkyls, cycloalkenyls, aryl, heterocycles, and/or heteroaryls. Preferred aryl groups are those containing six to thirty carbon atoms, preferably six to twenty carbon atoms, more preferably six to twelve carbon atoms. Especially preferred is an aryl group having six carbons, ten carbons or twelve carbons. Suitable aryl groups include phenyl, biphenyl, triphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenalene, phenanthrene, fluorene, pyrene, chrysene, perylene, and azulene, preferably phenyl, biphenyl, triphenyl, triphenylene, fluorene, and naphthalene. Additionally, the aryl group may be optionally substituted.

The term “heteroaryl” refers to and includes both single-ring aromatic groups and polycyclic aromatic ring systems that include at least one heteroatom. The heteroatoms include, but are not limited to O, S, N, P, B, Si, and Se. In many instances, O, S, or N are the preferred heteroatoms. Hetero-single ring aromatic systems are preferably single rings with 5 or 6 ring atoms, and the ring can have from one to six heteroatoms. The hetero-polycyclic ring systems can have two or more rings in which two atoms are common to two adjoining rings (the rings are “fused”) wherein at least one of the rings is a heteroaryl, e.g., the other rings can be cycloalkyls, cycloalkenyls, aryl, heterocycles, and/or heteroaryls. The hetero-polycyclic aromatic ring systems can have from one to six heteroatoms per ring of the polycyclic aromatic ring system. Preferred heteroaryl groups are those containing three to thirty carbon atoms, preferably three to twenty carbon atoms, more preferably three to twelve carbon atoms. Suitable heteroaryl groups include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridylindole, pyrrolodipyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indoxazine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine, benzofuropyridine, furodipyridine, benzothienopyridine, thienodipyridine, benzoselenophenopyridine, and selenophenodipyridine, preferably dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, triazine, benzimidazole, 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazine, and aza-analogs thereof. Additionally, the heteroaryl group may be optionally substituted.

Of the aryl and heteroaryl groups listed above, the groups of triphenylene, naphthalene, anthracene, dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, pyrazine, pyrimidine, triazine, and benzimidazole, and the respective aza-analogs of each thereof are of particular interest.

The terms alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aralkyl, heterocyclic group, aryl, and heteroaryl, as used herein, are independently unsubstituted, or independently substituted, with one or more General Substituents.

In many instances, the General Substituents are selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, selenyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

In some instances, the Preferred General Substituents are selected from the group consisting of deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, sulfanyl, and combinations thereof.

In some instances, the More Preferred General Substituents are selected from the group consisting of deuterium, fluorine, alkyl, cycloalkyl, alkoxy, aryloxy, amino, silyl, aryl, heteroaryl, sulfanyl, and combinations thereof.

In yet other instances, the Most Preferred General Substituents are selected from the group consisting of deuterium, fluorine, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof.

The terms “substituted” and “substitution” refer to a substituent other than H that is bonded to the relevant position, e.g., a carbon or nitrogen. For example, when R¹ represents mono-substitution, then one R¹ must be other than H (i.e., a substitution). Similarly, when R¹ represents di-substitution, then two of R¹ must be other than H. Similarly, when R¹ represents zero or no substitution, R¹, for example, can be a hydrogen for available valencies of ring atoms, as in carbon atoms for benzene and the nitrogen atom in pyrrole, or simply represents nothing for ring atoms with fully filled valencies, e.g., the nitrogen atom in pyridine. The maximum number of substitutions possible in a ring structure will depend on the total number of available valencies in the ring atoms.

As used herein, “combinations thereof” indicates that one or more members of the applicable list are combined to form a known or chemically stable arrangement that one of ordinary skill in the art can envision from the applicable list. For example, an alkyl and deuterium can be combined to form a partial or fully deuterated alkyl group; a halogen and alkyl can be combined to form a halogenated alkyl substituent; and a halogen, alkyl, and aryl can be combined to form a halogenated arylalkyl. In one instance, the term substitution includes a combination of two to four of the listed groups. In another instance, the term substitution includes a combination of two to three groups. In yet another instance, the term substitution includes a combination of two groups. Preferred combinations of substituent groups are those that contain up to fifty atoms that are not hydrogen or deuterium, or those which include up to forty atoms that are not hydrogen or deuterium, or those that include up to thirty atoms that are not hydrogen or deuterium. In many instances, a preferred combination of substituent groups will include up to twenty atoms that are not hydrogen or deuterium.

The “aza” designation in the fragments described herein, i.e. aza-dibenzofuran, aza-dibenzothiophene, etc. means that one or more of the C—H groups in the respective aromatic ring can be replaced by a nitrogen atom, for example, and without any limitation, azatriphenylene encompasses both dibenzo[f,h]quinoxaline and dibenzo[f,h]quinoline. One of ordinary skill in the art can readily envision other nitrogen analogs of the aza-derivatives described above, and all such analogs are intended to be encompassed by the terms as set forth herein.

As used herein, “deuterium” refers to an isotope of hydrogen. Deuterated compounds can be readily prepared using methods known in the art. For example, U.S. Pat. No. 8,557,400, Patent Pub. No. WO 2006/095951, and U.S. Pat. Application Pub. No. US 2011/0037057, which are hereby incorporated by reference in their entireties, describe the making of deuterium-substituted organometallic complexes. Further reference is made to Ming Yan, et al., Tetrahedron 2015, 71, 1425-30 and Atzrodt et al., Angew. Chem. Int. Ed. (Reviews) 2007, 46, 7744-65, which are incorporated by reference in their entireties, describe the deuteration of the methylene hydrogens in benzyl amines and efficient pathways to replace aromatic ring hydrogens with deuterium, respectively.

It is to be understood that when a molecular fragment is described as being a substituent or otherwise attached to another moiety, its name may be written as if it were a fragment (e.g. phenyl, phenylene, naphthyl, dibenzofuryl) or as if it were the whole molecule (e.g. benzene, naphthalene, dibenzofuran). As used herein, these different ways of designating a substituent or attached fragment are considered to be equivalent.

In some instance, a pair of adjacent substituents can be optionally joined or fused into a ring. The preferred ring is a five, six, or seven-membered carbocyclic or heterocyclic ring, includes both instances where the portion of the ring formed by the pair of substituents is saturated and where the portion of the ring formed by the pair of substituents is unsaturated. As used herein, “adjacent” means that the two substituents involved can be on the same ring next to each other, or on two neighboring rings having the two closest available substitutable positions, such as 2, 2′ positions in a biphenyl, or 1, 8 position in a naphthalene, as long as they can form a stable fused ring system.

B. The Compounds of the Present Disclosure

In one aspect, the present disclosure provides a compound comprising a first ligand L_A having a structure of Formula I,

is provided. In Formula I:

• • moiety A is a monocyclic ring or a polycyclic fused ring system, where the monocyclic ring and each ring of the polycyclic fused ring system is independently a 5-membered or 6-membered carbocyclic or heterocyclic ring;
  • K is selected from the group consisting of a direct bond, O, S, N(R^α), P(R^α), B(R^α), C(R^α)(R^β), and Si(R^α)(R^β);
  • each of Z³ and Z² is independently C or N;
  • each of X³ to X⁸ is independently C or N;
  • Y is selected from the group consisting of BR, BRR′, NR, PR, P(O)R, O, S, Se, C═O, C═S, C═Se, C═NR′, C═CR′R″, S═O, SO₂, CR, CRR′, SiRR′, and GeRR′;
  • each of R¹, R², and R³ independently represents mono to the maximum allowable substitution, or no substitutions;
  • at least one R² or R³ is a substituted or unsubstituted 5-membered or 6-membered carbocyclic or heterocyclic ring, a silyl group, a germyl group, or an electron-withdrawing group;
  • each R^α, R^β, R^R, R^R′, R, R′, R″, R¹, R², and R³ is independently a hydrogen or a substituent selected from the group consisting of the General Substituents defined herein;
  • L_A is coordinated to a metal M selected from the group consisting of Ir, Rh, Re, Ru, Os, Pt, Pd, Ag, Au, and Cu;
  • metal M may be coordinated to other ligands;
  • L_A may be joined with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand;
  • wherein any two substituents may be joined or fused to form a ring.

In some embodiments, if an R³ substituent is a heterocyclic ring, then no other R³ substituent is F or CN.

In some embodiments, no R² substituent is carbazole. In some embodiments, no R² substituent is carbazole if moiety A is imidazole or pyridine.

In some embodiments, L_A does not comprise

where X is O or S.

In some embodiments, the compound is not

In some embodiments, the compound does not include

In some embodiments of Formula I, at least one of R¹, R², or R³ is partially or fully deuterated. In some embodiments, at least one 1V is partially or fully deuterated. In some embodiments, at least one R² is partially chor fully deuterated. In some embodiments, at least one R³ is partially or fully deuterated. In some embodiments, at least R or R′ if present is partially or fully deuterated.

In some embodiments, each R^α, R^β, R^R, R^R′, R, R′, R″, R¹, R², and R³ is independently hydrogen or a substituent selected from the group consisting of the Preferred General Substituents defined herein. In some embodiments, each R^α, R^β, R^R, R^R′, R, R′, R″, R¹, R², and R³ is independently hydrogen or a substituent selected from the group consisting of the More Preferred General Substituents defined herein. In some embodiments, each R^α, R^β, R^R, R^R′, R, R′, R″, R¹, R², and R³ is independently hydrogen or a substituent selected from the group consisting of the Most Preferred General Substituents defined herein.

In some embodiments, Z¹ is N and Z² is C. In some embodiments, Z¹ is C and Z² is N. In some embodiments, Z¹ is C and Z² is C. In some embodiments where Z¹ is C, Z¹ is carbene carbon.

In some embodiments, K is a direct bond. In some embodiments, K is O. In some embodiments, K is S.

In some embodiments, K is N(R^α), P(R^α), or B(R^α). In some embodiments, K is C(R^α)(R^β) or Si(R^α)(R^β).

In some embodiments, moiety A is a monocyclic ring. In some embodiments, moiety A is selected from the group consisting of benzene, pyridine, pyrimidine, pyridazine, pyrazine, triazine, imidazole, pyrazole, pyrrole, oxazole, furan, thiophene, and thiazole.

In some embodiments, moiety A is a polycyclic fused ring system. In some embodiments, moiety A is selected from the group consisting of naphthalene, quinoline, isoquinoline, quinazoline, benzofuran, aza-benzofuran, benzoxazole, aza-benzoxazole, benzothiophene, aza-benzothiophene, benzothiazole, aza-benzothiazole, benzoselenophene, aza-benzoselenophene, indene, aza-indene, indole, aza-indole, benzimidazole, aza-benzimidazole, carbazole, aza-carbazole, dibenzofuran, aza-dibenzofuran, dibenzothiophene, aza-dibenzothiophene, quinoxaline, phthalazine, phenanthrene, aza-phenanathrene, anthracene, aza-antracene, phenanthridine, fluorene, and aza-fluorene.

In some embodiments, moiety A is an aza-polycyclic fused ring system including a benzo ring where one C is replaced with an N. In some such embodiments, the N that replaced a C of the benzo ring is bonded to the metal M.

In some embodiments, moiety A is selected from the group consisting of pyridine and benzimidazole.

In some embodiments, ring B is bonded to moiety A by a C atom.

In some embodiments, ring B is bonded to metal M by a C atom. In some embodiments, ring B is bonded to metal M by a N atom.

In some embodiments, each of X¹ to X⁴ is C.

In some embodiments, moiety A is a polycyclic fused ring structure. In some embodiments, moiety A is independently a polycyclic fused ring structure comprising at least three fused rings. In some embodiments, the polycyclic fused ring structure has two 6-membered rings and one 5-membered ring. In some such embodiments, the 5-membered ring is fused to the ring coordinated to metal M and the second 6-membered ring is fused to the 5-membered ring. In some embodiments, moiety A is selected from the group consisting of dibenzofuran, dibenzothiophene, dibenzoselenophene, and aza-variants thereof. In some such embodiments, moiety A can independently be further substituted at the ortho- or meta-position of the O, S, or Se atom by a substituent selected from the group consisting of deuterium, fluorine, nitrile, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof. In some such embodiments, the aza-variants contain exactly one N atom at the 6-position (ortho to the O, S, or Se) with a substituent at the 7-position (meta to the O, S, or Se).

In some embodiments, moiety A is a polycyclic fused ring structure comprising at least four fused rings. In some embodiments, the polycyclic fused ring structure comprises three 6-membered rings and one 5-membered ring. In some such embodiments, the 5-membered ring is fused to the ring coordinated to metal M, the second 6-membered ring is fused to the 5-membered ring, and the third 6-membered ring is fused to the second 6-membered ring. In some such embodiments, the third 6-membered ring is further substituted by a substituent selected from the group consisting of deuterium, fluorine, nitrile, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof.

In some embodiments, moiety A is a polycyclic fused ring structure comprising at least five fused rings. In some embodiments, the polycyclic fused ring structure comprises four 6-membered rings and one 5-membered ring or three 6-membered rings and two 5-membered rings. In some embodiments comprising two 5-membered rings, the rings are fused together. In some embodiments comprising two 5-membered rings, the 5-membered rings are separated by at least one 6-membered ring. In some embodiments with one 5-membered ring, the 5-membered ring is fused to the ring coordinated to metal M, the second 6-membered ring is fused to the 5-membered ring, the third 6-membered ring is fused to the second 6-membered ring, and the fourth 6-membered ring is fused to the third-6-membered ring.

In some embodiments, moiety A is an aza version of the polycyclic fused rings described above. In some such embodiments, moiety A contains exactly one aza N atom. In some such embodiments, moiety A contains exactly two aza N atoms, which can be in one ring, or in two different rings. In some such embodiments, the ring having aza N atom is separated by at least two other rings from the metal M atom. In some such embodiments, the ring having aza N atom is separated by at least three other rings from the metal M atom. In some such embodiments, each of the ortho position of the aza N atom is substituted.

In some embodiments, at least one of X¹ to X⁴ is N. In some embodiments, exactly one of X¹ to X⁴ is N.

In some embodiments, each of X⁵ to X⁸ is C. In some embodiments, at least one of X⁵ to X⁸ is N. In some embodiments, exactly one of X⁵ to X⁸ is N.

In some embodiments, X⁵ is N. In some embodiments, X⁶ is N. In some embodiments, X⁷ is N. In some embodiments, X⁸ is N.

In some embodiments, Y is selected from the group consisting of O, S, and Se. In some embodiments, Y is O. In some embodiments, Y is S. In some embodiments, Y is Se.

In some embodiments, Y is selected from the group consisting of BR, NR, PR, and CR.

In some embodiments, Y is selected from the group consisting of BRR′, CRR′, SiRR′, and GeRR′.

In some embodiments, Y is selected from the group consisting of P(O)R, C═O, C═S, C═Se, C═NR′, C═CR′R″, S═O, and SO₂.

In some embodiments, at least one R¹ is not hydrogen.

In some embodiments, at least one R¹ is a cyclic moiety A1 selected from the group consisting of cycloalkyl, aryl, or heteroaryl, which can be further substituted. In some embodiments, at least one atom of the cyclic moiety A1 adjacent to the bond with moiety A is substituted by a moiety that is not hydrogen. In some embodiments, at least one atom of the cyclic moiety A1 adjacent to the bond with moiety A substituted by a moiety selected from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof. In some embodiments, at least one atom of the cyclic moiety A1 adjacent to the bond with moiety A is substituted by alkyl comprising at least 3 C atoms.

In some embodiments, each atom of the cyclic moiety A1 adjacent to the bond with moiety A is substituted by a moiety that is not hydrogen. In some embodiments, each atom of the cyclic moiety A1 adjacent to the bond with moiety A is substituted by a moiety that is independently selected from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof. In some embodiments, each atom of the cyclic moiety A1 adjacent to the bond with moiety A is substituted by a moiety that is independently alkyl comprising at least 3 C atoms.

In some embodiments, at least one atom of the cyclic moiety A1 that is not adjacent to the bond with moiety A is substituted by a moiety that is not hydrogen. In some embodiments, at least one atom of the cyclic moiety A1 that is not adjacent to the bond with moiety A is substituted by a moiety selected from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof.

In some embodiments, at least one atom of the cyclic moiety A1 that is not adjacent to the bond with moiety A is substituted by alkyl comprising at least 3 C atoms. In some embodiments, at least one atom of the cyclic moiety A1 that is not adjacent to the bond with moiety A is substituted by benzene or substituted benzene.

In some embodiments, the cyclic moiety A1 is aryl or heteroaryl.

In some embodiments, the cyclic moiety A1 is a 6-membered ring. In some such embodiments, the atom para to the bond with moiety A is substituted by a moiety selected from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl, or a combination thereof. In some embodiments, the cyclic moiety A1 is benzene.

In some embodiments, at least one R² is not hydrogen.

In some embodiments, at least one R² is a substituent selected from the group consisting of a 5-membered or 6-membered heterocyclic ring and the structures in the EWG List defined herein.

In some embodiments, at least one R² substituent is a 5-membered or 6-membered heterocyclic ring comprising at least two heteroatoms. In some such embodiments, each of the at least two heteroatoms is independently selected from N and O.

In some embodiments, at least one R² substituent is a 5-membered or 6-membered heterocyclic ring comprising at least three heteroatoms. In some such embodiments, each of the at least three heteroatoms is independently selected from N, S, and O.

In some embodiment, at least one R² substituent is selected from the structures in the EWG List defined herein.

In some embodiments, two R² are joined or fused to form a ring.

In some embodiments, each R² is hydrogen.

In some embodiments, at least one R³ is not hydrogen. In some embodiments, R³ at X⁵ is not H. In some embodiments, R³ at X⁶ is not hydrogen. In some embodiments R³ at X⁷ is not hydrogen. In some embodiments, R³ at X⁸ is not hydrogen.

In some embodiments, at least one R³ is a substituent selected from the group consisting of a 5-membered heterocyclic ring, 6-membered heterocyclic ring, and the structures in the EWG List defined herein.

In some embodiments, at least one R³ substituent is a 5-membered or 6-membered heterocyclic ring comprising at least two heteroatoms. In some such embodiments, each of the at least two heteroatoms is independently selected from N and O.

In some embodiments, at least one R³ substituent is a 5-membered or 6-membered heterocyclic ring comprising at least three heteroatoms. In some such embodiments, each of the at least three heteroatoms is independently selected from N, S, and O.

In some embodiments, at least one R³ substituent is a 5-membered or 6-membered heterocyclic ring comprising at least three heteroatoms.

In some embodiments, at least one R³ substituent is selected from the structures in the EWG List defined herein.

In some embodiments, two R³ are joined or fused to form a ring.

In some embodiments, each R³ is hydrogen.

In some embodiments, the electron-withdrawing group commonly comprises one or more highly electronegative elements including but not limited to fluorine, oxygen, sulfur, nitrogen, chlorine, and bromine.

In some embodiments of the compound, the electron-withdrawing group has a Hammett constant larger than 0. In some embodiments, the electron-withdrawing group has a Hammett constant equal or larger than 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, or 1.1.

In some embodiments, the electron-withdrawn group is selected from the group consisting of the structures in the following LIST EWG 1: F, CF₃, CN, COCH₃, CHO, COCF₃, COOMe, COOCF₃, NO₂, SF₃, SiF₃, PF₄, SF₅, OCF₃, SCF₃, SeCF₃, SOCF₃, SeOCF₃, SO₂F, SO₂CF₃, SeO₂CF₃, OSeO₂CF₃, OCN, SCN, SeCN, NC, ⁺N(R^k2)₃, (R^k2)₂CCN, (R^k2)₂CCF₃, CNC(CF₃)₂, BR^k3R^k2, substituted or unsubstituted dibenzoborole, 1-substituted carbazole, 1,9-substituted carbazole, substituted or unsubstituted carbazole, substituted or unsubstituted pyridine, substituted or unsubstituted pyrimidine, substituted or unsubstituted pyrazine, substituted or unsubstituted pyridoxine, substituted or unsubstituted triazine, substituted or unsubstituted oxazole, substituted or unsubstituted benzoxazole, substituted or unsubstituted thiazole, substituted or unsubstituted benzothiazole, substituted or unsubstituted imidazole, substituted or unsubstituted benzimidazole, ketone, carboxylic acid, ester, nitrile, isonitrile, sulfinyl, sulfonyl, partially and fully fluorinated alkyl, partially and fully fluorinated aryl, partially and fully fluorinated heteroaryl, cyano-containing alkyl, cyano-containing aryl, cyano-containing heteroaryl, isocyanate,

wherein Y^G is selected from the group consisting of BR_e, NR_e, PR_e, O, S, Se, C═O, S═O, SO₂, CR_eR_f, SiR_eR_f, and GeR_eR_f; and

R^k1 each independently represents mono to the maximum allowable substitutions, or no substitution;

wherein each of R^k1, R^k2, R^k3, R_e, and R_f is independently a hydrogen or a substituent selected from the group consisting of the General Substituents defined herein.

In some embodiments, the electron-withdrawing group is selected from the group consisting of the structures in the following LIST EWG 2:

In some embodiments, the electron-withdrawing group is selected from the group consisting of the structures in the following LIST EWG 3:

In some embodiments, the electron-withdrawing group is selected from the group consisting of the structures in the following LIST EWG 4:

In some embodiments, the electron-withdrawing group is a π-electron deficient electron-withdrawing group. In some embodiments, the π-electron deficient electron-withdrawing group is selected from the group consisting of the structures in the following LIST Pi-EWG: CN, COCH₃, CHO, COCF₃, COOMe, COOCF₃, NO₂, SF₃, SiF₃, PF₄, SF₅, OCF₃, SCF₃, SeCF₃, SOCF₃, SeOCF₃, SO₂F, SO₂CF₃, SeO₂CF₃, OSeO₂CF₃, OCN, SCN, SeCN, NC, ⁺N(R^k1)₃, BR^k1R^k2, substituted or unsubstituted dibenzoborole, 1-substituted carbazole, 1,9-substituted carbazole, substituted or unsubstituted carbazole, substituted or unsubstituted pyridine, substituted or unsubstituted pyrimidine, substituted or unsubstituted pyrazine, substituted or unsubstituted pyridazine, substituted or unsubstituted triazine, substituted or unsubstituted oxazole, substituted or unsubstituted benzoxazole, substituted or unsubstituted thiazole, substituted or unsubstituted benzothiazole, substituted or unsubstituted imidazole, substituted or unsubstituted benzimidazole, ketone, carboxylic acid, ester, nitrile, isonitrile, sulfinyl, sulfonyl, partially and fully fluorinated aryl, partially and fully fluorinated heteroaryl, cyano-containing aryl, cyano-containing heteroaryl, isocyanate,

wherein the variables are the same as previously defined.

In some embodiments, the ligand L_A is selected from the group consisting of the structures of the following LIST 1:

wherein:

• • each of X⁹ to X¹⁷ is independently C or N;
  • when present, at least one of X⁹ to X¹³ is N;
  • Y^A is selected from the group consisting of BR, BRR′, NR, PR, P(O)R, O, S, Se, C═O, C═S, C═Se, C═NR′, C═CR′R″, S═O, SO₂, CR, CRR′, SiRR′, and GeRR′;
  • R⁴ represents mono to the maximum allowable number of substitutions, or no substitution;
  • R^W represents mono to the maximum allowable number of substitutions;
  • each R⁴ is independently hydrogen or a substituent selected from the group consisting of the General Substituents defined herein;
  • each R^W is independently selected from the group consisting of a substituted 5-membered heterocyclic ring, unsubstituted 5-membered heterocyclic ring, substituted 6-membered heterocyclic ring, unsubstituted 6-membered heterocyclic ring, and the structures in the EWG List defined herein.

In some embodiments for the structures of LIST 1, at least one of R¹, R², R³, or R⁴ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one of R¹, R², R³, or R⁴ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one of R¹, R², R³, or R⁴ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one of R¹, R², R³, or R⁴ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one of R¹, R², R³, or R⁴ is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments, the ligand L_A is selected from the group consisting of the structures of the following LIST 2:

wherein:

• • Y^A is selected from the group consisting of BR, BRR′, N, NR, PR, P(O)R, O, S, Se, S═O, SO₂, SiRR′, and GeRR′;
  • each of R^AA, R^BB, and R^CC represent mono to the maximum allowable substitutions, or no substitutions;
  • each R^AA, R^CC, and R^NN is independently hydrogen or a substituent selected from the group consisting of the General Substituents defined herein;
  • at least one of R^BB and R^CC is selected from the group consisting of the structures in the following LIST 3:

wherein

• • each of X^AA and X^BB is independently C or N;
  • Y^B is selected from the group consisting of BR, NR, O, S, Se, CRR′, SiRR′, and GeRR′;
  • R^S is mono to the maximum allowable substitution, or no substitution;
  • each R^N, R^S and R^O is independently hydrogen or a substituent selected from the group consisting of the General Substituents defined herein; and
  • R^WW is selected from the group consisting of the structures in the EWG List defined herein.

In some embodiments for the structures of LIST 2, at least one of R^AA, R^BB, or R^CC is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one of R^AA, R^BB, or R^CC is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one of R^AA, R^BB, or R^CC is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one of R^AA, R^BB, or R^CC is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one of R^AA, R^BB, or R^CC is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments comprising a structure of LIST 3, X^AA is C for those structures of LIST 3 where there is only X^AA in the structure, and X^AA and X^BB are both C for those structures where both X^AA and X^BB are present in the structure.

In some embodiments comprising a structure of LIST 3, X^AA is N and X^BB is C for those structures where both X^AA and X^BB are present in the structure. In some embodiments comprising a structure of LIST 3, X^AA is C and X^BB is N for those structures where both X^AA and X^BB are present in the structure.

In some embodiments comprising a structure of LIST 3, Y^B is O. In some embodiments comprising a structure of LIST 3, Y^B is S. In some embodiments comprising a structure of LIST 3, Y^B is NR.

In some embodiments comprising a structure of LIST 3, two R^S are joined to form a ring. In some embodiments comprising a structure of LIST 3, two R^S are joined to form a ring system selected from the group consisting of benzene, pyridine, pyrimidine, pyrazine, benzofuran, benzothiophene, indole, azabenzofuran, azabenzothiophene, and azaindole. In some embodiments comprising a structure of LIST 3, two R^S are joined to form a benzene ring, a pyridine ring, or a benzofuran moiety.

In some embodiments, the ligand L_A is selected from the group consisting of L_Ai(E^A)(R^K)(R^L)(R^M), wherein i is an integer from 1 to 88, E^A is a moiety selected from E1 to E140, and each of R^K, R^L, and R^M is independently selected from R1 to R50; wherein L_A1(E¹) (R¹)(R¹)(R¹) to L_A88(E¹⁴⁰)(R⁵⁰)(R⁵⁰)(R⁵⁰) have the structures defined in the following LIST 4:

LA	Structure of LA	LA	Structure of LA
LAI(EA)(RK)(RL)(RM), wherein LA1(E1)(R1)(R1)(R1) to LA1(E140)(R50)(R50) (R50) have the structure		LA2(EA)(RK)(RL)(RM), wherein LA2(E1)(R1)(R1)(R1) to LA2(E140)(R50)(R50) (R50) have the structure
LA3(EA)(RK)(RL)(RM), wherein LA3(E1)(R1)(R1)(R1) to LA3(E140)(R50)(R50) (R50) have the structure		LA4(EA)(RK)(RL)(RM), wherein LA4(E1)(R1)(R1)(R1) to LA4(E140)(R50)(R50) (R50) have the structure
LA5(EA)(RK)(RL)(RM), wherein LA5(E1)(R1)(R1)(R1) to LA5(E140)(R50)(R50) (R50) have the structure		LA6(EA)(RK)(RL)(RM), wherein LA6(E1)(R1)(R1)(R1) to LA6(E140)(R50)(R50) (R50) have the structure
LA7(EA)(RK)(RL)(RM), wherein LA7(E1)(R1)(R1)(R1) to LA7(E140)(R50)(R50) (R50) have the structure		LA8(EA)(RK)(RL)(RM), wherein LA8(E1)(R1)(R1)(R1) to LA8(E140)(R50)(R50) (R50) have the structure
LA9(EA)(RK)(RL)(RM), wherein LA9(E1)(R1)(R1)(R1) to LA9(E140)(R50)(R50) (R50) have the structure		LA10(EA)(RK)(RL)(RM), wherein LA10(E1)(R1)(R1)(R1) to LA10(E140)(R50)(R50) (R50) have the structure
LA11(EA)(RK)(RL)(RM), wherein LA11(E1)(R1)(R1)(R1) to LA11(E140)(R50)(R50) (R50) have the structure		LA12(EA)(RK)(RL)(RM), wherein LA12(E1)(R1)(R1)(R1) to LA12(E140)(R50)(R50) (R50) have the structure
LA13(EA)(RK)(RL)(RM), wherein LA13(E1)(R1)(R1)(R1) to LA13(E140)(R50)(R50) (R50) have the structure		LA14(EA)(RK)(RL)(RM), wherein LA14(E1)(R1)(R1)(R1) to LA14(E140)(R50)(R50) (R50) have the structure
LA15(EA)(RK)(RL)(RM), wherein LA15(E1)(R1)(R1)(R1) to LA15(E140)(R50)(R50) (R50) have the structure		LA16(EA)(RK)(RL)(RM), wherein LA16(E1)(R1)(R1)(R1) to LA16(E140)(R50)(R50) (R50) have the structure
LA17(EA)(RK)(RL)(RM), wherein LA17(E1)(R1)(R1)(R1) to LA17(E140)(R50)(R50) (R50) have the structure		LA18(EA)(RK)(RL)(RM), wherein LA18(E1)(R1)(R1)(R1) to LA18(E140)(R50)(R50) (R50) have the structure
LA19(EA)(RK)(RL)(RM), wherein LA19(E1)(R1)(R1)(R1) to LA19(E140)(R50)(R50) (R50) have the structure		LA20(EA)(RK)(RL)(RM), wherein LA20(E1)(R1)(R1)(R1) to LA20(E140)(R50)(R50) (R50) have the structure
LA21(EA)(RK)(RL)(RM), wherein LA21(E1)(R1)(R1)(R1) to LA21(E140)(R50)(R50) (R50) have the structure		LA22(EA)(RK)(RL)(RM), wherein LA22(E1)(R1)(R1)(R1) to LA22(E140)(R50)(R50) (R50) have the structure
LA23(EA)(RK)(RL)(RM), wherein LA23(E1)(R1)(R1)(R1) to LA23(E140)(R50)(R50) (R50) have the structure		LA24(EA)(RK)(RL)(RM), wherein LA24(E1)(R1)(R1)(R1) to LA24(E140)(R50)(R50) (R50) have the structure
LA25(EA)(RK)(RL)(RM), wherein LA25(E1)(R1)(R1)(R1) to LA25(E140)(R50)(R50) (R50) have the structure		LA26(EA)(RK)(RL)(RM), wherein LA26(E1)(R1)(R1)(R1) to LA26(E140)(R50)(R50) (R50) have the structure
LA27(EA)(RK)(RL)(RM), wherein LA27(E1)(R1)(R1)(R1) to LA27(E140)(R50)(R50) (R50) have the structure		LA28(EA)(RK)(RL)(RM), wherein LA28(E1)(R1)(R1)(R1) to LA28(E140)(R50)(R50) (R50) have the structure
LA29(EA)(RK)(RL)(RM), wherein LA29(E1)(R1)(R1)(R1) to LA29(E140)(R50)(R50) (R50) have the structure		LA30(EA)(RK)(RL)(RM), wherein LA30(E1)(R1)(R1)(R1) to LA30(E140)(R50)(R50) (R50) have the structure
LA31(EA)(RK)(RL)(RM), wherein LA31(E1)(R1)(R1)(R1) to LA31(E140)(R50)(R50) (R50) have the structure		LA32(EA)(RK)(RL)(RM), wherein LA32(E1)(R1)(R1)(R1) to LA32(E140)(R50)(R50) (R50) have the structure
LA33(EA)(RK)(RL)(RM), wherein LA33(E1)(R1)(R1)(R1) to LA33(E140)(R50)(R50) (R50) have the structure		LA34(EA)(RK)(RL)(RM), wherein LA34(E1)(R1)(R1)(R1) to LA34(E140)(R50)(R50) (R50) have the structure
LA35(EA)(RK)(RL)(RM), wherein LA35(E1)(R1)(R1)(R1) to LA35(E140)(R50)(R50) (R50) have the structure		LA36(EA)(RK)(RL)(RM), wherein LA36(E1)(R1)(R1)(R1) to LA36(E140)(R50)(R50) (R50) have the structure
LA37(EA)(RK)(RL)(RM), wherein LA37(E1)(R1)(R1)(R1) to LA37(E140)(R50)(R50) (R50) have the structure		LA38(EA)(RK)(RL)(RM), wherein LA38(E1)(R1)(R1)(R1) to LA38(E140)(R50)(R50) (R50) have the structure
LA39(EA)(RK)(RL)(RM), wherein LA39(E1)(R1)(R1)(R1) to LA39(E140)(R50)(R50) (R50) have the structure		LA40(EA)(RK)(RL)(RM), wherein LA40(E1)(R1)(R1)(R1) to LA40(E140)(R50)(R50) (R50) have the structure
LA41(EA)(RK)(RL)(RM), wherein LA41(E1)(R1)(R1)(R1) to LA41(E140)(R50)(R50) (R50) have the structure		LA42(EA)(RK)(RL)(RM), wherein LA42(E1)(R1)(R1)(R1) to LA42(E140)(R50)(R50) (R50) have the structure
LA43(EA)(RK)(RL)(RM), wherein LA43(E1)(R1)(R1)(R1) to LA43(E140)(R50)(R50) (R50) have the structure		LA44(EA)(RK)(RL)(RM), wherein LA44(E1)(R1)(R1)(R1) to LA44(E140)(R50)(R50) (R50) have the structure
LA45(EA)(RK)(RL)(RM), wherein LA45(E1)(R1)(R1)(R1) to LA45(E140)(R50)(R50) (R50) have the structure		LA46(EA)(RK)(RL)(RM), wherein LA46(E1)(R1)(R1)(R1) to LA46(E140)(R50)(R50) (R50) have the structure
LA47(EA)(RK)(RL)(RM), wherein LA47(E1)(R1)(R1)(R1) to LA47(E140)(R50)(R50) (R50) have the structure		LA48(EA)(RK)(RL)(RM), wherein LA48(E1)(R1)(R1)(R1) to LA48(E140)(R50)(R50) (R50) have the structure
LA49(EA)(RK)(RL)(RM), wherein LA49(E1)(R1)(R1)(R1) to LA49(E140)(R50)(R50) (R50) have the structure		LA50(EA)(RK)(RL)(RM), wherein LA50(E1)(R1)(R1)(R1) to LA50(E140)(R50)(R50) (R50) have the structure
LA51(EA)(RK)(RL)(RM), wherein LA51(E1)(R1)(R1)(R1) to LA51(E140)(R50)(R50) (R50) have the structure		LA52(EA)(RK)(RL)(RM), wherein LA52(E1)(R1)(R1)(R1) to LA52(E140)(R50)(R50) (R50) have the structure
LA53(EA)(RK)(RL)(RM), wherein LA53(E1)(R1)(R1)(R1) to LA53(E140)(R50)(R50) (R50) have the structure		LA54(EA)(RK)(RL)(RM), wherein LA54(E1)(R1)(R1)(R1) to LA54(E140)(R50)(R50) (R50) have the structure
LA55(EA)(RK)(RL)(RM), wherein LA55(E1)(R1)(R1)(R1) to LA55(E140)(R50)(R50) (R50) have the structure		LA56(EA)(RK)(RL)(RM), wherein LA56(E1)(R1)(R1)(R1) to LA56(E140)(R50)(R50) (R50) have the structure
LA57(EA)(RK)(RL)(RM), wherein LA57(E1)(R1)(R1)(R1) to LA57(E140)(R50)(R50) (R50) have the structure		LA58(EA)(RK)(RL)(RM), wherein LA58(E1)(R1)(R1)(R1) to LA58(E140)(R50)(R50) (R50) have the structure
LA59(EA)(RK)(RL)(RM), wherein LA59(E1)(R1)(R1)(R1) to LA59(E140)(R50)(R50) (R50) have the structure		LA60(EA)(RK)(RL)(RM), wherein LA60(E1)(R1)(R1)(R1) to LA60(E140)(R50)(R50) (R50) have the structure
LA61(EA)(RK)(RL)(RM), wherein LA61(E1)(R1)(R1)(R1) to LA61(E140)(R50)(R50) (R50) have the structure		LA62(EA)(RK)(RL)(RM), wherein LA62(E1)(R1)(R1)(R1) to LA62(E140)(R50)(R50) (R50) have the structure
LA63(EA)(RK)(RL)(RM), wherein LA63(E1)(R1)(R1)(R1) to LA63(E140)(R50)(R50) (R50) have the structure		LA64(EA)(RK)(RL)(RM), wherein LA64(E1)(R1)(R1)(R1) to LA64(E140)(R50)(R50) (R50) have the structure
LA65(EA)(RK)(RL)(RM), wherein LA65(E1)(R1)(R1)(R1) to LA65(E140)(R50)(R50) (R50) have the structure		LA66(EA)(RK)(RL)(RM), wherein LA66(E1)(R1)(R1)(R1) to LA66(E140)(R50)(R50) (R50) have the structure
LA67(EA)(RK)(RL)(RM), wherein LA67(E1)(R1)(R1)(R1) to LA67(E140)(R50)(R50) (R50) have the structure		LA68(EA)(RK)(RL)(RM), wherein LA68(E1)(R1)(R1)(R1) to LA68(E140)(R50)(R50) (R50) have the structure
LA69(EA)(RK)(RL)(RM), wherein LA69(E1)(R1)(R1)(R1) to LA69(E140)(R50)(R50) (R50) have the structure		LA70(EA)(RK)(RL)(RM), wherein LA70(E1)(R1)(R1)(R1) to LA70(E140)(R50)(R50) (R50) have the structure
LA71(EA)(RK)(RL)(RM), wherein LA71(E1)(R1)(R1)(R1) to LA71(E140)(R50)(R50) (R50) have the structure		LA72(EA)(RK)(RL)(RM), wherein LA72(E1)(R1)(R1)(R1) to LA72(E140)(R50)(R50) (R50) have the structure
LA73(EA)(RK)(RL)(RM), wherein LA73(E1)(R1)(R1)(R1) to LA73(E140)(R50)(R50) (R50) have the structure		LA74(EA)(RK)(RL)(RM), wherein LA74(E1)(R1)(R1)(R1) to LA74(E140)(R50)(R50) (R50) have the structure
LA75(EA)(RK)(RL)(RM), wherein LA75(E1)(R1)(R1)(R1) to LA75(E140)(R50)(R50) (R50) have the structure		LA76(EA)(RK)(RL)(RM), wherein LA76(E1)(R1)(R1)(R1) to LA76(E140)(R50)(R50) (R50) have the structure
LA77(EA)(RK)(RL)(RM), wherein LA77(E1)(R1)(R1)(R1) to LA77(E140)(R50)(R50)(R 50) have the structure		LA78(EA)(RK)(RL)(RM), wherein LA78(E1)(R1) (R1)(R1) to LA78(E140)(R50)(R50) (R50) have the structure
LA79(EA)(RK)(RL)(RM), wherein LA79(E1)(R1)(R1)(R1) to LA79(E140)(R50)(R50)(R 50) have the structure		LA80(EA)(RK)(RL)(RM), wherein LA80(E1)(R1)(R1)(R1) to LA80(E140)(R50)(R50) (R50) have the structure
LA81(EA)(RK)(RL)(RM), wherein LA81(E1)(R1)(R1)(R1) to LA81(E140)(R50)(R50) (R50) have the structure		LA82(EA)(RK)(RL)(RM), wherein LA82(E1)(R1)(R1)(R1) to LA82(E140)(R50)(R50) (R50) have the structure
LA83(EA)(RK)(RL)(RM), wherein LA83(E1)(R1)(R1)(R1) to LA83(E140)(R50)(R50) (R50) have the structure		LA84(EA)(RK)(RL)(RM), wherein LA84(E1)(R1)(R1)(R1) to LA84(E140)(R50)(R50) (R50) have the structure
LA85(EA)(RK)(RL)(RM), wherein LA85(E1)(R1)(R1)(R1) to LA85(E140)(R50)(R50) (R50) have the structure		LA86(EA)(RK)(RL)(RM), wherein LA86(E1)(R1)(R1)(R1) to LA86(E140)(R50)(R50) (R50) have the structure
LA87(EA)(RK)(RL)(RM), wherein LA87(E1)(R1)(R1)(R1) to LA87(E140)(R50)(R50) (R50)have the structure		LA88(EA)(RK)(RL)(RM), wherein LA88(E1)(R1)(R1)(R1) to LA88(E140)(R50)(R50) (R50)have the structure

wherein R1 to R50 have the structures defined in the following LIST 5:

wherein each of E1 to E140 has the structure defined in the following LIST 6:

In some embodiments, the compound has a formula of M(L_A)_p(L_B)_q(L_C)_r wherein L_B and L_C are each a bidentate ligand; and wherein p is 1, 2, or 3; q is 0, 1, or 2; r is 0, 1, or 2; and p+q+r is the oxidation state of the metal M.

In some embodiments, the compound has a formula selected from the group consisting of Ir(L_A)₃, Ir(L_A)(L_B)₂, Ir(L_A)₂(L_B), Ir(L_A)₂(L_C), and Ir(L_A)(L B)(L_C); and wherein L_A, L_B, and L_C are different from each other.

In some embodiments, L_B is a substituted or unsubstituted phenylpyridine, and L_C is a substituted or unsubstituted acetylacetonate.

In some embodiments, the compound has a formula of Pt(L_A)(L_B); and wherein L_A and L_B can be same or different. In some such embodiments, L_A and L_B are connected to form a tetradentate ligand.

In some embodiments, L_B and L_C are each independently selected from the group consisting of the structures of the following LIST 7:

wherein:

• • T is selected from the group consisting of B, Al, Ga, and In;
  • K^1′ is selected from the group consisting of a single bond, O, S, NR_e, PR_e, BR_e, CR_eR_f, and SiR_eR_f;
  • each of Y¹ to Y¹³ is independently selected from the group consisting of C and N;
  • Y′ is selected from the group consisting of BR_e, BR_eR_f, NR_e, PR_e, P(O)R e, O, S, Se, C═O, C═S, C═Se, C═NR_e, C═CR_eR_f, S═O, SO₂, CR_eR_f, SiR_eR_f, and GeR_eR_f;
  • R_e and R_f can be fused or joined to form a ring;
  • each R_a, R_b, R_c, and R_d independently represents from mono to the maximum allowed number of substitutions, or no substitution;
  • each of R_a1, R_b1, R_c1, R_d1, R_a, R_b, R_c, R_d, R_e, and R_f is independently a hydrogen or a substituent selected from the group consisting of the General Substituents defined herein; and
  • any two substituents of R_a1, R_b1, R_c1, R_a1, R_a, R_b, R_c, and R_d can be fused or joined to form a ring or form a multidentate ligand.

In some embodiments, L_B and L_C are each independently selected from the group consisting of the structures of the following LIST 8:

wherein:

• • R_a′, R_b′, R_c′, R_d′, and R_e′ each independently represents zero, mono, or up to a maximum allowed number of substitution to its associated ring;
  • R_a′, R_b′, R_c′, R_d′, and R_e′ each independently hydrogen or a substituent selected from the group consisting of the General Substituents defined herein; and
  • two substituents of R_a′, R_b′, R_c′, R_d′, and R_e′ can be fused or joined to form a ring or form a multidentate ligand.

In some embodiments, the compound has a structure of formula Ir(L_A)₃, formula Ir(L_A)(L_Bk)₂, formula Ir(L_A)₂(L_Bk), formula Ir(L_A)₂(L_Cj-I), or formula Ir(L_A)₂(L_Cj-II),

• • wherein L_A is a ligand according to any of the structures for L_A described herein, including the structures in LIST 1, LIST 2, and LIST 4, and L_A1 (E¹)(R¹)(R¹)(R¹) to L_A86(E¹⁴⁰)(R⁵⁰)(R⁵⁰)(R⁵⁰);
  • wherein k is an integer from 1 to 474;
  • wherein j is an integer from 1 to 1416;
  • wherein each L_Bk has the structure defined in the following LIST 9:

• • wherein each L_Cj-I has a structure based on formula

andeach L_Cj-II has a structure based on formula

wherein for each L_Cj in L_Cj-I and R²⁰¹ and R²⁰² are each independently defined in the following LIST 10:

LCj	R201	R202	LCj	R201	R202	LCj	R201	R202	LCj	R201	R202
LC1	RD1	RD1	LC193	RD1	RD3	LC385	RD17	RD40	LC577	RD143	RD120
LC2	RD2	RD2	LC194	RD1	RD4	LC386	RD17	RD41	LC578	RD143	RD133
LC3	RD3	RD3	LC195	RD1	RD5	LC387	RD17	RD42	LC579	RD143	RD134
LC4	RD4	RD4	LC196	RD1	RD9	LC388	RD17	RD43	LC580	RD143	RD135
LC5	RD5	RD5	LC197	RD1	RD10	LC389	RD17	RD48	LC581	RD143	RD136
LC6	RD6	RD6	LC198	RD1	RD17	LC390	RD17	RD49	LC582	RD143	RD144
LC7	RD7	RD7	LC199	RD1	RD18	LC391	RD17	RD50	LC583	RD143	RD145
LC8	RD8	RD8	LC200	RD1	RD20	LC392	RD17	RD54	LC584	RD143	RD146
LC9	RD9	RD9	LC201	RD1	RD22	LC393	RD17	RD55	LC585	RD143	RD147
LC10	RD10	RD10	LC202	RD1	RD37	LC394	RD17	RD58	LC586	RD143	RD149
LC11	RD11	RD11	LC203	RD1	RD40	LC395	RD17	RD59	LC587	RD143	RD151
LC12	RD12	RD12	LC204	RD1	RD41	LC396	RD17	RD78	LC588	RD143	RD154
LC13	RD13	RD13	LC205	RD1	RD42	LC397	RD17	RD79	LC589	RD143	RD155
LC14	RD14	RD14	LC206	RD1	RD43	LC398	RD17	RD81	LC590	RD143	RD161
LC15	RD15	RD15	LC207	RD1	RD48	LC399	RD17	RD87	LC591	RD143	RD175
LC16	RD16	RD16	LC208	RD1	RD49	LC400	RD17	RD88	LC592	RD144	RD3
LC17	RD17	RD17	LC209	RD1	RD50	LC401	RD17	RD89	LC593	RD144	RD5
LC18	RD18	RD18	LC210	RD1	RD54	LC402	RD17	RD93	LC594	RD144	RD17
LC19	RD19	RD19	LC211	RD1	RD55	LC403	RD17	RD116	LC595	RD144	RD18
LC20	RD20	RD20	LC212	RD1	RD58	LC404	RD17	RD117	LC596	RD144	RD20
LC21	RD21	RD21	LC213	RD1	RD59	LC405	RD17	RD118	LC597	RD144	RD22
LC22	RD22	RD22	LC214	RD1	RD78	LC406	RD17	RD119	LC598	RD144	RD37
LC23	RD23	RD23	LC215	RD1	RD79	LC407	RD17	RD120	LC599	RD144	RD40
LC24	RD24	RD24	LC216	RD1	RD81	LC408	RD17	RD133	LC600	RD144	RD41
LC25	RD25	RD25	LC217	RD1	RD87	LC409	RD17	RD134	LC601	RD144	RD42
LC26	RD26	RD26	LC218	RD1	RD88	LC410	RD17	RD135	LC602	RD144	RD43
LC27	RD27	RD27	LC219	RD1	RD89	LC411	RD17	RD136	LC603	RD144	RD48
LC28	RD28	RD28	LC220	RD1	RD93	LC412	RD17	RD143	LC604	RD144	RD49
LC29	RD29	RD29	LC221	RD1	RD116	LC413	RD17	RD144	LC605	RD144	RD54
LC30	RD30	RD30	LC222	RD1	RD117	LC414	RD17	RD145	LC606	RD144	RD58
LC31	RD31	RD31	LC223	RD1	RD118	LC415	RD17	RD146	LC607	RD144	RD59
LC32	RD32	RD32	LC224	RD1	RD119	LC416	RD17	RD147	LC608	RD144	RD78
LC33	RD33	RD33	LC225	RD1	RD120	LC417	RD17	RD149	LC609	RD144	RD79
LC34	RD34	RD34	LC226	RD1	RD133	LC418	RD17	RD151	LC610	RD144	RD81
LC35	RD35	RD35	LC227	RD1	RD134	LC419	RD17	RD154	LC611	RD144	RD87
LC36	RD36	RD36	LC228	RD1	RD135	LC420	RD17	RD155	LC612	RD144	RD88
LC37	RD37	RD37	LC229	RD1	RD136	LC421	RD17	RD161	LC613	RD144	RD89
LC38	RD38	RD38	LC230	RD1	RD143	LC422	RD17	RD175	LC614	RD144	RD93
LC39	RD39	RD39	LC231	RD1	RD144	LC423	RD50	RD3	LC615	RD144	RD116
LC40	RD40	RD40	LC232	RD1	RD145	LC424	RD50	RD5	LC616	RD144	RD117
LC41	RD41	RD41	LC233	RD1	RD146	LC425	RD50	RD18	LC617	RD144	RD118
LC42	RD42	RD42	LC234	RD1	RD147	LC426	RD50	RD20	LC618	RD144	RD119
LC43	RD43	RD43	LC235	RD1	RD149	LC427	RD50	RD22	LC619	RD144	RD120
LC44	RD44	RD44	LC236	RD1	RD151	LC428	RD50	RD37	LC620	RD144	RD133
LC45	RD45	RD45	LC237	RD1	RD154	LC429	RD50	RD40	LC621	RD144	RD134
LC46	RD46	RD46	LC238	RD1	RD155	LC430	RD50	RD41	LC622	RD144	RD135
LC47	RD47	RD47	LC239	RD1	RD161	LC431	RD50	RD42	LC623	RD144	RD136
LC48	RD48	RD48	LC240	RD1	RD175	LC432	RD50	RD43	LC624	RD144	RD145
LC49	RD49	RD49	LC241	RD4	RD3	LC433	RD50	RD48	LC625	RD144	RD146
LC50	RD50	RD50	LC242	RD4	RD5	LC434	RD50	RD49	LC626	RD144	RD147
LC51	RD51	RD51	LC243	RD4	RD9	LC435	RD50	RD54	LC627	RD144	RD149
LC52	RD52	RD52	LC244	RD4	RD10	LC436	RD50	RD55	LC628	RD144	RD151
LC53	RD53	RD53	LC245	RD4	RD17	LC437	RD50	RD58	LC629	RD144	RD154
LC54	RD54	RD54	LC246	RD4	RD18	LC438	RD50	RD59	LC630	RD144	RD155
LC55	RD55	RD55	LC247	RD4	RD20	LC439	RD50	RD78	LC631	RD144	RD161
LC56	RD56	RD56	LC248	RD4	RD22	LC440	RD50	RD79	LC632	RD144	RD175
LC57	RD57	RD57	LC249	RD4	RD37	LC441	RD50	RD81	LC633	RD145	RD3
LC58	RD58	RD58	LC250	RD4	RD40	LC442	RD50	RD87	LC634	RD145	RD5
LC59	RD59	RD59	LC251	RD4	RD41	LC443	RD50	RD88	LC635	RD145	RD17
LC60	RD60	RD60	LC252	RD4	RD42	LC444	RD50	RD89	LC636	RD145	RD18
LC61	RD61	RD61	LC253	RD4	RD43	LC445	RD50	RD93	LC637	RD145	RD20
LC62	RD62	RD62	LC254	RD4	RD48	LC446	RD50	RD116	LC638	RD145	RD22
LC63	RD63	RD63	LC255	RD4	RD49	LC447	RD50	RD117	LC639	RD145	RD37
LC64	RD64	RD64	LC256	RD4	RD50	LC448	RD50	RD118	LC640	RD145	RD40
LC65	RD65	RD65	LC257	RD4	RD54	LC449	RD50	RD119	LC641	RD145	RD41
LC66	RD66	RD66	LC258	RD4	RD55	LC450	RD50	RD120	LC642	RD145	RD42
LC67	RD67	RD67	LC259	RD4	RD58	LC451	RD50	RD133	LC643	RD145	RD43
LC68	RD68	RD68	LC260	RD4	RD59	LC452	RD50	RD134	LC644	RD145	RD48
LC69	RD69	RD69	LC261	RD4	RD78	LC453	RD50	RD135	LC645	RD145	RD49
LC70	RD70	RD70	LC262	RD4	RD79	LC454	RD50	RD136	LC646	RD145	RD54
LC71	RD71	RD71	LC263	RD4	RD81	LC455	RD50	RD143	LC647	RD145	RD58
LC72	RD72	RD72	LC264	RD4	RD87	LC456	RD50	RD144	LC648	RD145	RD59
LC73	RD73	RD73	LC265	RD4	RD88	LC457	RD50	RD145	LC649	RD145	RD78
LC74	RD74	RD74	LC266	RD4	RD89	LC458	RD50	RD146	LC650	RD145	RD79
LC75	RD75	RD75	LC267	RD4	RD93	LC459	RD50	RD147	LC651	RD145	RD81
LC76	RD76	RD76	LC268	RD4	RD116	LC460	RD50	RD149	LC652	RD145	RD87
LC77	RD77	RD77	LC269	RD4	RD117	LC461	RD50	RD151	LC653	RD145	RD88
LC78	RD78	RD78	LC270	RD4	RD118	LC462	RD50	RD154	LC654	RD145	RD89
LC79	RD79	RD79	LC271	RD4	RD119	LC463	RD50	RD155	LC655	RD145	RD93
LC80	RD80	RD80	LC272	RD4	RD120	LC464	RD50	RD161	LC656	RD145	RD116
LC81	RD81	RD81	LC273	RD4	RD133	LC465	RD50	RD175	LC657	RD145	RD117
LC82	RD82	RD82	LC274	RD4	RD134	LC466	RD55	RD3	LC658	RD145	RD118
LC83	RD83	RD83	LC275	RD4	RD135	LC467	RD55	RD5	LC659	RD145	RD119
LC84	RD84	RD84	LC276	RD4	RD136	LC468	RD55	RD18	LC660	RD145	RD120
LC85	RD85	RD85	LC277	RD4	RD143	LC469	RD55	RD20	LC661	RD145	RD133
LC86	RD86	RD86	LC278	RD4	RD144	LC470	RD55	RD22	LC662	RD145	RD134
LC87	RD87	RD87	LC279	RD4	RD145	LC471	RD55	RD37	LC663	RD145	RD135
LC88	RD88	RD88	LC280	RD4	RD146	LC472	RD55	RD40	LC664	RD145	RD136
LC89	RD89	RD89	LC281	RD4	RD147	LC473	RD55	RD41	LC665	RD145	RD146
LC90	RD90	RD90	LC282	RD4	RD149	LC474	RD55	RD42	LC666	RD145	RD147
LC91	RD91	RD91	LC283	RD4	RD151	LC475	RD55	RD43	LC667	RD145	RD149
LC92	RD92	RD92	LC284	RD4	RD154	LC476	RD55	RD48	LC668	RD145	RD151
LC93	RD93	RD93	LC285	RD4	RD155	LC477	RD55	RD49	LC669	RD145	RD154
LC94	RD94	RD94	LC286	RD4	RD161	LC478	RD55	RD54	LC670	RD145	RD155
LC95	RD95	RD95	LC287	RD4	RD175	LC479	RD55	RD58	LC671	RD145	RD161
LC96	RD96	RD96	LC288	RD9	RD3	LC480	RD55	RD59	LC672	RD145	RD175
LC97	RD97	RD97	LC289	RD9	RD5	LC481	RD55	RD78	LC673	RD146	RD3
LC98	RD98	RD98	LC290	RD9	RD10	LC482	RD55	RD7	LC674	RD146	RD5
LC99	RD99	RD99	LC291	RD9	RD17	LC483	RD55	RD81	LC675	RD146	RD17
LC100	RD100	RD100	LC292	RD9	RD18	LC484	RD55	RD87	LC676	RD146	RD18
LC101	RD101	RD101	LC293	RD9	RD20	LC485	RD55	RD88	LC677	RD146	RD20
LC102	RD102	RD102	LC294	RD9	RD22	LC486	RD55	RD89	LC678	RD146	RD22
LC103	RD103	RD103	LC295	RD9	RD37	LC487	RD55	RD93	LC679	RD146	RD37
LC104	RD104	RD104	LC296	RD9	RD40	LC488	RD55	RD116	LC680	RD146	RD40
LC105	RD105	RD105	LC297	RD9	RD41	LC489	RD55	RD117	LC681	RD146	RD41
LC106	RD106	RD106	LC298	RD9	RD42	LC490	RD55	RD118	LC682	RD146	RD42
LC107	RD107	RD107	LC299	RD9	RD43	LC491	RD55	RD119	LC683	RD146	RD43
LC108	RD108	RD108	LC300	RD9	RD48	LC492	RD55	RD120	LC684	RD146	RD48
LC109	RD109	RD109	LC301	RD9	RD49	LC493	RD55	RD133	LC685	RD146	RD49
LC110	RD110	RD110	LC302	RD9	RD50	LC494	RD55	RD134	LC686	RD146	RD54
LC111	RD111	RD111	LC303	RD9	RD54	LC495	RD55	RD135	LC687	RD146	RD58
LC112	RD112	RD112	LC304	RD9	RD55	LC496	RD55	RD136	LC688	RD146	RD59
LC113	RD113	RD113	LC305	RD9	RD58	LC497	RD55	RD143	LC689	RD146	RD78
LC114	RD114	RD114	LC306	RD9	RD59	LC498	RD55	RD144	LC690	RD146	RD79
LC115	RD115	RD115	LC307	RD9	RD78	LC499	RD55	RD145	LC691	RD146	RD81
LC116	RD116	RD116	LC308	RD9	RD79	LC500	RD55	RD146	LC692	RD146	RD87
LC117	RD117	RD117	LC309	RD9	RD81	LC501	RD55	RD147	LC693	RD146	RD88
LC118	RD118	RD118	LC310	RD9	RD87	LC502	RD55	RD149	LC694	RD146	RD89
LC119	RD119	RD119	LC311	RD9	RD88	LC503	RD55	RD151	LC695	RD146	RD93
LC120	RD120	RD120	LC312	RD9	RD89	LC504	RD55	RD154	LC696	RD146	RD117
LC121	RD121	RD121	LC313	RD9	RD93	LC505	RD55	RD155	LC697	RD146	RD118
LC122	RD122	RD122	LC314	RD9	RD116	LC506	RD55	RD161	LC698	RD146	RD119
LC123	RD123	RD123	LC315	RD9	RD117	LC507	RD55	RD175	LC699	RD146	RD120
LC124	RD124	RD124	LC316	RD9	RD118	LC508	RD116	RD3	LC700	RD146	RD133
LC125	RD125	RD125	LC317	RD9	RD119	LC509	RD116	RD5	LC701	RD146	RD134
LC126	RD126	RD126	LC318	RD9	RD120	LC510	RD116	RD17	LC702	RD146	RD135
LC127	RD127	RD127	LC319	RD9	RD133	LC511	RD116	RD18	LC703	RD146	RD136
LC128	RD128	RD128	LC320	RD9	RD134	LC512	RD116	RD20	LC704	RD146	RD146
LC129	RD129	RD129	LC321	RD9	RD135	LC513	RD116	RD22	LC705	RD146	RD147
LC130	RD130	RD130	LC322	RD9	RD136	LC514	RD116	RD37	LC706	RD146	RD149
LC131	RD131	RD131	LC323	RD9	RD143	LC515	RD116	RD40	LC707	RD146	RD151
LC132	RD132	RD132	LC324	RD9	RD144	LC516	RD116	RD41	LC708	RD146	RD154
LC133	RD133	RD133	LC325	RD9	RD145	LC517	RD116	RD42	LC709	RD146	RD155
LC134	RD134	RD134	LC326	RD9	RD146	LC518	RD116	RD43	LC710	RD146	RD161
LC135	RD135	RD135	LC327	RD9	RD147	LC519	RD116	RD48	LC711	RD146	RD175
LC136	RD136	RD136	LC328	RD9	RD149	LC520	RD116	RD49	LC712	RD133	RD3
LC137	RD137	RD137	LC329	RD9	RD151	LC521	RD116	RD54	LC713	RD133	RD5
LC138	RD138	RD138	LC330	RD9	RD154	LC522	RD116	RD58	LC714	RD133	RD3
LC139	RD139	RD139	LC331	RD9	RD155	LC523	RD116	RD59	LC715	RD133	RD18
LC140	RD140	RD140	LC332	RD9	RD161	LC524	RD116	RD78	LC716	RD133	RD20
LC141	RD141	RD141	LC333	RD9	RD175	LC525	RD116	RD79	LC717	RD133	RD22
LC142	RD142	RD142	LC334	RD10	RD3	LC526	RD116	RD81	LC718	RD133	RD37
LC143	RD143	RD143	LC335	RD10	RD5	LC527	RD116	RD87	LC719	RD133	RD40
LC144	RD144	RD144	LC336	RD10	RD17	LC528	RD116	RD88	LC720	RD133	RD41
LC145	RD145	RD145	LC337	RD10	RD18	LC529	RD116	RD89	LC721	RD133	RD42
LC146	RD146	RD146	LC338	RD10	RD20	LC530	RD116	RD93	LC722	RD133	RD43
LC147	RD147	RD147	LC339	RD10	RD22	LC531	RD116	RD117	LC723	RD133	RD48
LC148	RD148	RD148	LC340	RD10	RD37	LC532	RD116	RD118	LC724	RD133	RD49
LC149	RD149	RD149	LC341	RD10	RD40	LC533	RD116	RD119	LC725	RD133	RD54
LC150	RD150	RD150	LC342	RD10	RD41	LC534	RD116	RD120	LC726	RD133	RD58
LC151	RD151	RD151	LC343	RD10	RD42	LC535	RD116	RD133	LC727	RD133	RD59
LC152	RD152	RD152	LC344	RD10	RD43	LC536	RD116	RD134	LC728	RD133	RD78
LC153	RD153	RD153	LC345	RD10	RD48	LC537	RD116	RD135	LC729	RD133	RD79
LC154	RD154	RD154	LC346	RD10	RD49	LC538	RD116	RD136	LC730	RD133	RD81
LC155	RD155	RD155	LC347	RD10	RD50	LC539	RD116	RD143	LC731	RD133	RD87
LC156	RD156	RD156	LC348	RD10	RD54	LC540	RD116	RD144	LC732	RD133	RD88
LC157	RD157	RD157	LC349	RD10	RD55	LC541	RD116	RD145	LC733	RD133	RD89
LC158	RD158	RD158	LC350	RD10	RD58	LC542	RD116	RD146	LC734	RD133	RD93
LC159	RD159	RD159	LC351	RD10	RD59	LC543	RD116	RD147	LC735	RD133	RD117
LC160	RD160	RD160	LC352	RD10	RD78	LC544	RD116	RD149	LC736	RD133	RD118
LC161	RD161	RD161	LC353	RD10	RD79	LC545	RD116	RD151	LC737	RD133	RD119
LC162	RD162	RD162	LC354	RD10	RD81	LC546	RD116	RD154	LC738	RD133	RD120
LC163	RD163	RD163	LC355	RD10	RD87	LC547	RD116	RD155	LC739	RD133	RD133
LC164	RD164	RD164	LC356	RD10	RD88	LC548	RD116	RD161	LC740	RD133	RD134
LC165	RD165	RD165	LC357	RD10	RD89	LC549	RD116	RD175	LC741	RD133	RD135
LC166	RD166	RD166	LC358	RD10	RD93	LC550	RD143	RD3	LC742	RD133	RD136
LC167	RD167	RD167	LC359	RD10	RD116	LC551	RD143	RD5	LC743	RD133	RD146
LC168	RD168	RD168	LC360	RD10	RD117	LC552	RD143	RD17	LC744	RD133	RD147
LC169	RD169	RD169	LC361	RD10	RD118	LC553	RD143	RD18	LC745	RD133	RD149
LC170	RD170	RD170	LC362	RD10	RD119	LC554	RD143	RD20	LC746	RD133	RD151
LC171	RD171	RD171	LC363	RD10	RD120	LC555	RD143	RD22	LC747	RD133	RD154
LC172	RD172	RD172	LC364	RD10	RD133	LC556	RD143	RD37	LC748	RD133	RD155
LC173	RD173	RD173	LC365	RD10	RD134	LC557	RD143	RD40	LC749	RD133	RD161
LC174	RD174	RD174	LC366	RD10	RD135	LC558	RD143	RD41	LC750	RD133	RD175
LC175	RD175	RD175	LC367	RD10	RD136	LC559	RD143	RD42	LC751	RD175	RD3
LC176	RD176	RD176	LC368	RD10	RD143	LC560	RD143	RD43	LC752	RD175	RD5
LC177	RD177	RD177	LC369	RD10	RD144	LC561	RD143	RD48	LC753	RD175	RD18
LC178	RD178	RD178	LC370	RD10	RD145	LC562	RD143	RD49	LC754	RD175	RD20
LC179	RD179	RD179	LC371	RD10	RD146	LC563	RD143	RD54	LC755	RD175	RD22
LC180	RD180	RD180	LC372	RD10	RD147	LC564	RD143	RD58	LC756	RD175	RD37
LC181	RD181	RD181	LC373	RD10	RD149	LC565	RD143	RD59	LC757	RD175	RD40
LC182	RD182	RD182	LC374	RD10	RD151	LC566	RD143	RD78	LC758	RD175	RD41
LC183	RD183	RD183	LC375	RD10	RD154	LC567	RD143	RD79	LC759	RD175	RD42
LC184	RD184	RD184	LC376	RD10	RD155	LC568	RD143	RD81	LC760	RD175	RD43
LC185	RD185	RD185	LC377	RD10	RD161	LC569	RD143	RD87	LC761	RD175	RD48
LC186	RD186	RD186	LC378	RD10	RD175	LC570	RD143	RD88	LC762	RD175	RD49
LC187	RD187	RD187	LC379	RD17	RD3	LC571	RD143	RD89	LC763	RD175	RD54
LC188	RD188	RD188	LC380	RD17	RD5	LC572	RD143	RD93	LC764	RD175	RD58
LC189	RD189	RD189	LC381	RD17	RD18	LC573	RD143	RD116	LC765	RD175	RD59
LC190	RD190	RD190	LC382	RD17	RD20	LC574	RD143	RD117	LC766	RD175	RD78
LC191	RD191	RD191	LC383	RD17	RD22	LC575	RD143	RD118	LC767	RD175	RD79
LC192	RD192	RD192	LC384	RD17	RD37	LC576	RD143	RD119	LC768	RD175	RD81
LC769	RD193	RD193	LC877	RD1	RD193	LC985	RD4	RD193	LC1093	RD9	RD193
LC770	RD194	RD194	LC878	RD1	RD194	LC986	RD4	RD194	LC1094	RD9	RD194
LC771	RD195	RD195	LC879	RD1	RD195	LC987	RD4	RD195	LC1095	RD9	RD195
LC772	RD196	RD196	LC880	RD1	RD196	LC988	RD4	RD196	LC1096	RD9	RD196
LC773	RD197	RD197	LC881	RD1	RD197	LC989	RD4	RD197	LC1097	RD9	RD197
LC774	RD198	RD198	LC882	RD1	RD198	LC990	RD4	RD198	LC1098	RD9	RD198
LC775	RD199	RD199	LC883	RD1	RD199	LC991	RD4	RD199	LC1099	RD9	RD199
LC776	RD200	RD200	LC884	RD1	RD200	LC992	RD4	RD200	LC1100	RD9	RD200
LC777	RD201	RD201	LC885	RD1	RD201	LC993	RD4	RD201	LC1101	RD9	RD201
LC778	RD202	RD202	LC886	RD1	RD202	LC994	RD4	RD202	LC1102	RD9	RD202
LC779	RD203	RD203	LC887	RD1	RD203	LC995	RD4	RD203	LC1103	RD9	RD203
LC780	RD204	RD204	LC888	RD1	RD204	LC996	RD4	RD204	LC1104	RD9	RD204
LC781	RD205	RD205	LC889	RD1	RD205	LC997	RD4	RD205	LC1105	RD9	RD205
LC782	RD206	RD206	LC890	RD1	RD206	LC998	RD4	RD206	LC1106	RD9	RD206
LC783	RD207	RD207	LC891	RD1	RD207	LC999	RD4	RD207	LC1107	RD9	RD207
LC784	RD208	RD208	LC892	RD1	RD208	LC1000	RD4	RD208	LC1108	RD9	RD208
LC785	RD209	RD209	LC893	RD1	RD209	LC1001	RD4	RD209	LC1109	RD9	RD209
LC786	RD210	RD210	LC894	RD1	RD210	LC1002	RD4	RD210	LC1110	RD9	RD210
LC787	RD211	RD211	LC895	RD1	RD211	LC1003	RD4	RD211	LC1111	RD9	RD211
LC788	RD212	RD212	LC896	RD1	RD212	LC1004	RD4	RD212	LC1112	RD9	RD212
LC789	RD213	RD213	LC897	RD1	RD213	LC1005	RD4	RD213	LC1113	RD9	RD213
LC790	RD214	RD214	LC898	RD1	RD214	LC1006	RD4	RD214	LC1114	RD9	RD214
LC791	RD215	RD215	LC899	RD1	RD215	LC1007	RD4	RD215	LC1115	RD9	RD215
LC792	RD216	RD216	LC900	RD1	RD216	LC1008	RD4	RD216	LC1116	RD9	RD216
LC793	RD217	RD217	LC901	RD1	RD217	LC1009	RD4	RD217	LC1117	RD9	RD217
LC794	RD218	RD218	LC902	RD1	RD218	LC1010	RD4	RD218	LC1118	RD9	RD218
LC795	RD219	RD219	LC903	RD1	RD219	LC1011	RD4	RD219	LC1119	RD9	RD219
LC796	RD220	RD220	LC904	RD1	RD220	LC1012	RD4	RD220	LC1120	RD9	RD220
LC797	RD221	RD221	LC905	RD1	RD221	LC1013	RD4	RD221	LC1121	RD9	RD221
LC798	RD222	RD222	LC906	RD1	RD222	LC1014	RD4	RD222	LC1122	RD9	RD222
LC799	RD223	RD223	LC907	RD1	RD223	LC1015	RD4	RD223	LC1123	RD9	RD223
LC800	RD224	RD224	LC908	RD1	RD224	LC1016	RD4	RD224	LC1124	RD9	RD224
LC801	RD225	RD225	LC909	RD1	RD225	LC1017	RD4	RD225	LC1125	RD9	RD225
LC802	RD226	RD226	LC910	RD1	RD226	LC1018	RD4	RD226	LC1126	RD9	RD226
LC803	RD227	RD227	LC911	RD1	RD227	LC1019	RD4	RD227	LC1127	RD9	RD227
LC804	RD228	RD228	LC912	RD1	RD228	LC1020	RD4	RD228	LC1128	RD9	RD228
LC805	RD229	RD229	LC913	RD1	RD229	LC1021	RD4	RD229	LC1129	RD9	RD229
LC806	RD230	RD230	LC914	RD1	RD230	LC1022	RD4	RD230	LC1130	RD9	RD230
LC807	RD231	RD231	LC915	RD1	RD231	LC1023	RD4	RD231	LC1131	RD9	RD231
LC808	RD232	RD232	LC916	RD1	RD232	LC1024	RD4	RD232	LC1132	RD9	RD232
LC809	RD233	RD233	LC917	RD1	RD233	LC1025	RD4	RD233	LC1133	RD9	RD233
LC810	RD234	RD234	LC918	RD1	RD234	LC1026	RD4	RD234	LC1134	RD9	RD234
LC811	RD235	RD235	LC919	RD1	RD235	LC1027	RD4	RD235	LC1135	RD9	RD235
LC812	RD236	RD236	LC920	RD1	RD236	LC1028	RD4	RD236	LC1136	RD9	RD236
LC813	RD237	RD237	LC921	RD1	RD237	LC1029	RD4	RD237	LC1137	RD9	RD237
LC814	RD238	RD238	LC922	RD1	RD238	LC1030	RD4	RD238	LC1138	RD9	RD238
LC815	RD239	RD239	LC923	RD1	RD239	LC1031	RD4	RD239	LC1139	RD9	RD239
LC816	RD240	RD240	LC924	RD1	RD240	LC1032	RD4	RD240	LC1140	RD9	RD240
LC817	RD241	RD241	LC925	RD1	RD241	LC1033	RD4	RD241	LC1141	RD9	RD241
LC818	RD242	RD242	LC926	RD1	RD242	LC1034	RD4	RD242	LC1142	RD9	RD242
LC819	RD243	RD243	LC927	RD1	RD243	LC1035	RD4	RD243	LC1143	RD9	RD243
LC820	RD244	RD244	LC928	RD1	RD244	LC1036	RD4	RD244	LC1144	RD9	RD244
LC821	RD245	RD245	LC929	RD1	RD245	LC1037	RD4	RD245	LC1145	RD9	RD245
LC822	RD246	RD246	LC930	RD1	RD246	LC1038	RD4	RD246	LC1146	RD9	RD246
LC823	RD17	RD193	LC931	RD50	RD193	LC1039	RD145	RD193	LC1147	RD168	RD193
LC824	RD17	RD194	LC932	RD50	RD194	LC1040	RD145	RD194	LC1148	RD168	RD194
LC825	RD17	RD195	LC933	RD50	RD195	LC1041	RD145	RD195	LC1149	RD168	RD195
LC826	RD17	RD196	LC934	RD50	RD196	LC1042	RD145	RD196	LC1150	RD168	RD196
LC827	RD17	RD197	LC935	RD50	RD197	LC1043	RD145	RD197	LC1151	RD168	RD197
LC828	RD17	RD198	LC936	RD50	RD198	LC1044	RD145	RD198	LC1152	RD168	RD198
LC829	RD17	RD199	LC937	RD50	RD199	LC1045	RD145	RD199	LC1153	RD168	RD199
LC830	RD17	RD200	LC938	RD50	RD200	LC1046	RD145	RD200	LC1154	RD168	RD200
LC831	RD17	RD201	LC939	RD50	RD201	LC1047	RD145	RD201	LC1155	RD168	RD201
LC832	RD17	RD202	LC940	RD50	RD202	LC1048	RD145	RD202	LC1156	RD168	RD202
LC833	RD17	RD203	LC941	RD50	RD203	LC1049	RD145	RD203	LC1157	RD168	RD203
LC834	RD17	RD204	LC942	RD50	RD204	LC1050	RD145	RD204	LC1158	RD168	RD204
LC835	RD17	RD205	LC943	RD50	RD205	LC1051	RD145	RD205	LC1159	RD168	RD205
LC836	RD17	RD206	LC944	RD50	RD206	LC1052	RD145	RD206	LC1160	RD168	RD206
LC837	RD17	RD207	LC945	RD50	RD207	LC1053	RD145	RD207	LC1161	RD168	RD207
LC838	RD17	RD208	LC946	RD50	RD208	LC1054	RD145	RD208	LC1162	RD168	RD208
LC839	RD17	RD209	LC947	RD50	RD209	LC1055	RD145	RD209	LC1163	RD168	RD209
LC840	RD17	RD210	LC948	RD50	RD210	LC1056	RD145	RD210	LC1164	RD168	RD210
LC841	RD17	RD211	LC949	RD50	RD211	LC1057	RD145	RD211	LC1165	RD168	RD211
LC842	RD17	RD212	LC950	RD50	RD212	LC1058	RD145	RD212	LC1166	RD168	RD212
LC843	RD17	RD213	LC951	RD50	RD213	LC1059	RD145	RD213	LC1167	RD168	RD213
LC844	RD17	RD214	LC952	RD50	RD214	LC1060	RD145	RD214	LC1168	RD168	RD214
LC845	RD17	RD215	LC953	RD50	RD215	LC1061	RD145	RD215	LC1169	RD168	RD215
LC846	RD17	RD216	LC954	RD50	RD216	LC1062	RD145	RD216	LC1170	RD168	RD216
LC847	RD17	RD217	LC955	RD50	RD217	LC1063	RD145	RD217	LC1171	RD168	RD217
LC848	RD17	RD218	LC956	RD50	RD218	LC1064	RD145	RD218	LC1172	RD168	RD218
LC849	RD17	RD219	LC957	RD50	RD219	LC1065	RD145	RD219	LC1173	RD168	RD219
LC850	RD17	RD220	LC958	RD50	RD220	LC1066	RD145	RD220	LC1174	RD168	RD220
LC851	RD17	RD221	LC959	RD50	RD221	LC1067	RD145	RD221	LC1175	RD168	RD221
LC852	RD17	RD222	LC960	RD50	RD222	LC1068	RD145	RD222	LC1176	RD168	RD222
LC853	RD17	RD223	LC961	RD50	RD223	LC1069	RD145	RD223	LC1177	RD168	RD223
LC854	RD17	RD224	LC962	RD50	RD224	LC1070	RD145	RD224	LC1178	RD168	RD224
LC855	RD17	RD225	LC963	RD50	RD225	LC1071	RD145	RD225	LC1179	RD168	RD225
LC856	RD17	RD226	LC964	RD50	RD226	LC1072	RD145	RD226	LC1180	RD168	RD226
LC857	RD17	RD227	LC965	RD50	RD227	LC1073	RD145	RD227	LC1181	RD168	RD227
LC858	RD17	RD228	LC966	RD50	RD228	LC1074	RD145	RD228	LC1182	RD168	RD228
LC859	RD17	RD229	LC967	RD50	RD229	LC1075	RD145	RD229	LC1183	RD168	RD229
LC860	RD17	RD230	LC968	RD50	RD230	LC1076	RD145	RD230	LC1184	RD168	RD230
LC861	RD17	RD231	LC969	RD50	RD231	LC1077	RD145	RD231	LC1185	RD168	RD231
LC862	RD17	RD232	LC970	RD50	RD232	LC1078	RD145	RD232	LC1186	RD168	RD232
LC863	RD17	RD233	LC971	RD50	RD233	LC1079	RD145	RD233	LC1187	RD168	RD233
LC864	RD17	RD234	LC972	RD50	RD234	LC1080	RD145	RD234	LC1188	RD168	RD234
LC865	RD17	RD235	LC973	RD50	RD235	LC1081	RD145	RD235	LC1189	RD168	RD235
LC866	RD17	RD236	LC974	RD50	RD236	LC1082	RD145	RD236	LC1190	RD168	RD236
LC867	RD17	RD237	LC975	RD50	RD237	LC1083	RD145	RD237	LC1191	RD168	RD237
LC868	RD17	RD238	LC976	RD50	RD238	LC1084	RD145	RD238	LC1192	RD168	RD238
LC869	RD17	RD239	LC977	RD50	RD239	LC1085	RD145	RD239	LC1193	RD168	RD239
LC870	RD17	RD240	LC978	RD50	RD240	LC1086	RD145	RD240	LC1194	RD168	RD240
LC871	RD17	RD241	LC979	RD50	RD241	LC1087	RD145	RD241	LC1195	RD168	RD241
LC872	RD17	RD242	LC980	RD50	RD242	LC1088	RD145	RD242	LC1196	RD168	RD242
LC873	RD17	RD243	LC981	RD50	RD243	LC1089	RD145	RD243	LC1197	RD168	RD243
LC874	RD17	RD244	LC982	RD50	RD244	LC1090	RD145	RD244	LC1198	RD168	RD244
LC875	RD17	RD245	LC983	RD50	RD245	LC1091	RD145	RD245	LC1199	RD168	RD245
LC876	RD17	RD246	LC984	RD50	RD246	LC1092	RD145	RD246	LC1200	RD168	RD246
LC1201	RD10	RD193	LC1255	RD55	RD193	LC1309	RD37	RD193	LC1363	RD143	RD193
LC1202	RD10	RD194	LC1256	RD55	RD194	LC1310	RD37	RD194	LC1364	RD143	RD194
LC1203	RD10	RD195	LC1257	RD55	RD195	LC1311	RD37	RD195	LC1365	RD143	RD195
LC1204	RD10	RD196	LC1258	RD55	RD196	LC1312	RD37	RD196	LC1366	RD143	RD196
LC1205	RD10	RD197	LC1259	RD55	RD197	LC1313	RD37	RD197	LC1367	RD143	RD197
LC1206	RD10	RD198	LC1260	RD55	RD198	LC1314	RD37	RD198	LC1368	RD143	RD198
LC1207	RD10	RD199	LC1261	RD55	RD199	LC1315	RD37	RD199	LC1369	RD143	RD199
LC1208	RD10	RD200	LC1262	RD55	RD200	LC1316	RD37	RD200	LC1370	RD143	RD200
LC1209	RD10	RD201	LC1263	RD55	RD201	LC1317	RD37	RD201	LC1371	RD143	RD201
LC1210	RD10	RD202	LC1264	RD55	RD202	LC1318	RD37	RD202	LC1372	RD143	RD202
LC1211	RD10	RD203	LC1265	RD55	RD203	LC1319	RD37	RD203	LC1373	RD143	RD203
LC1212	RD10	RD204	LC1266	RD55	RD204	LC1320	RD37	RD204	LC1374	RD143	RD204
LC1213	RD10	RD205	LC1267	RD55	RD205	LC1321	RD37	RD205	LC1375	RD143	RD205
LC1214	RD10	RD206	LC1268	RD55	RD206	LC1322	RD37	RD206	LC1376	RD143	RD206
LC1215	RD10	RD207	LC1269	RD55	RD207	LC1323	RD37	RD207	LC1377	RD143	RD207
LC1216	RD10	RD208	LC1270	RD55	RD208	LC1324	RD37	RD208	LC1378	RD143	RD208
LC1217	RD10	RD209	LC1271	RD55	RD209	LC1325	RD37	RD209	LC1379	RD143	RD209
LC1218	RD10	RD210	LC1272	RD55	RD210	LC1326	RD37	RD210	LC1380	RD143	RD210
LC1219	RD10	RD211	LC1273	RD55	RD211	LC1327	RD37	RD211	LC1381	RD143	RD211
LC1220	RD10	RD212	LC1274	RD55	RD212	LC1328	RD37	RD212	LC1382	RD143	RD212
LC1221	RD10	RD213	LC1275	RD55	RD213	LC1329	RD37	RD213	LC1383	RD143	RD213
LC1222	RD10	RD214	LC1276	RD55	RD214	LC1330	RD37	RD214	LC1384	RD143	RD214
LC1223	RD10	RD215	LC1277	RD55	RD215	LC1331	RD37	RD215	LC1385	RD143	RD215
LC1224	RD10	RD216	LC1278	RD55	RD216	LC1332	RD37	RD216	LC1386	RD143	RD216
LC1225	RD10	RD217	LC1279	RD55	RD217	LC1333	RD37	RD217	LC1387	RD143	RD217
LC1226	RD10	RD218	LC1280	RD55	RD218	LC1334	RD37	RD218	LC1388	RD143	RD218
LC1227	RD10	RD219	LC1281	RD55	RD219	LC1335	RD37	RD219	LC1389	RD143	RD219
LC1228	RD10	RD220	LC1282	RD55	RD220	LC1336	RD37	RD220	LC1390	RD143	RD220
LC1229	RD10	RD221	LC1283	RD55	RD221	LC1337	RD37	RD221	LC1391	RD143	RD221
LC1230	RD10	RD222	LC1284	RD55	RD222	LC1338	RD37	RD222	LC1392	RD143	RD222
LC1231	RD10	RD223	LC1285	RD55	RD223	LC1339	RD37	RD223	LC1393	RD143	RD223
LC1232	RD10	RD224	LC1286	RD55	RD224	LC1340	RD37	RD224	LC1394	RD143	RD224
LC1233	RD10	RD225	LC1287	RD55	RD225	LC1341	RD37	RD225	LC1395	RD143	RD225
LC1234	RD10	RD226	LC1288	RD55	RD226	LC1342	RD37	RD226	LC1396	RD143	RD226
LC1235	RD10	RD227	LC1289	RD55	RD227	LC1343	RD37	RD227	LC1397	RD143	RD227
LC1236	RD10	RD228	LC1290	RD55	RD228	LC1344	RD37	RD228	LC1398	RD143	RD228
LC1237	RD10	RD229	LC1291	RD55	RD229	LC1345	RD37	RD229	LC1399	RD143	RD229
LC1238	RD10	RD230	LC1292	RD55	RD230	LC1346	RD37	RD230	LC1400	RD143	RD230
LC1239	RD10	RD231	LC1293	RD55	RD231	LC1347	RD37	RD231	LC1401	RD143	RD231
LC1240	RD10	RD232	LC1294	RD55	RD232	LC1348	RD37	RD232	LC1402	RD143	RD232
LC1241	RD10	RD233	LC1295	RD55	RD233	LC1349	RD37	RD233	LC1403	RD143	RD233
LC1242	RD10	RD234	LC1296	RD55	RD234	LC1350	RD37	RD234	LC1404	RD143	RD234
LC1243	RD10	RD235	LC1297	RD55	RD235	LC1351	RD37	RD235	LC1405	RD143	RD235
LC1244	RD10	RD236	LC1298	RD55	RD236	LC1352	RD37	RD236	LC1406	RD143	RD236
LC1245	RD10	RD237	LC1299	RD55	RD237	LC1353	RD37	RD237	LC1407	RD143	RD237
LC1246	RD10	RD238	LC1300	RD55	RD238	LC1354	RD37	RD238	LC1408	RD143	RD238
LC1247	RD10	RD239	LC1301	RD55	RD239	LC1355	RD37	RD239	LC1409	RD143	RD239
LC1248	RD10	RD240	LC1302	RD55	RD240	LC1356	RD37	RD240	LC1410	RD143	RD240
LC1249	RD10	RD241	LC1303	RD55	RD241	LC1357	RD37	RD241	LC1411	RD143	RD241
LC1250	RD10	RD242	LC1304	RD55	RD242	LC1358	RD37	RD242	LC1412	RD143	RD242
LC1251	RD10	RD243	LC1305	RD55	RD243	LC1359	RD37	RD243	LC1413	RD143	RD243
LC1252	RD10	RD244	LC1306	RD55	RD244	LC1360	RD37	RD244	LC1414	RD143	RD244
LC1253	RD10	RD245	LC1307	RD55	RD245	LC1361	RD37	RD245	LC1415	RD143	RD245
LC1254	RD10	RD246	LC1308	RD55	RD246	LC1362	RD37	RD246	LC1416	RD143	RD246

wherein R^D1 to R^D246 have the structures in the following LIST 11:

In some embodiments, the compound is selected from the group consisting of only those compounds whose L_Bk corresponds to one of the following: L_B1, L_B2, L_B18, L_B28, L_B38, L_B108, L_B118, L_B122, L_B124, L_B126, L_B128, L_B130, L_B132, L_B134, L_B136, L_B138, L_B140, L_B142, L_B144, L_B156, L_B158, L_B160, L_B162, L_B164, L_B168, L_B172, L_B175, L_B204, L_B206, L_B214, L_B216, L_B218, L_B220, L_B222, L_B231, L_B233, L_B235, L_B237, L_B240, L_B242, L_B244, L_B246, L_B248, L_B250, L_B252, L_B254, L_B256, L_B258, L_B260, L_B262, L_B264, L_B265, L_B266, L_B267, L_B268, L_B269, and L_B270.

In some embodiments, the compound is selected from the group consisting of only those compounds whose L_Bk corresponds to one of the following: L_B1, L_B2, L_B18, L_B28, L_B38, L_B108, L_B118, L_B122, L_B126, L_B128, L_B132, L_B136, L_B138, L_B142, L_B156, L_B162, L_B204, L_B206, L_B214, L_B216, L_B218, L_B220, L_B231, L_B233, L_B237, L_B264, L_B265, L_B266, L_B267, L_B268, L_B269, and L_B270.

In some embodiments, the compound is selected from the group consisting of only those compounds having L_Cj-I or L_Cj-II ligand whose corresponding R²⁰¹ and R²⁰² are defined to be one of the following structures: R^D1, R^D3, R^D4, R^D5, R^D9, R^D10, R^D17, R^D18, R^D20, R^D22, R^D37, R^D40, R^D41, R^D42, R^D43, R^D48, R^D49, R^D50, R^D54, R^D55, R^D58, R^D59, R^D78, R^D79, R^D81, R^D87, R^D88, R^D89, R^D93, R^D116, R^D117, R^D118, R^D119, R^D120, R^D133, R^D134, R^D135, R^D136, R^D143, R^D144, R^D145, R^D146, R^D147, R^D149, R^D151, R^D154, R^D155, R^D161, R^D175R^D190, R^D193, R^D200, R^D201, R^D206, R^D210, R^D214, R^D215, R^D216, R^D218, R^D219, R^D220, R^D227, R^D237, R^D241, R^D242, R^D245, and R^D246.

In some embodiments, the compound is selected from the group consisting of only those compounds having L_Cj-I or L_Cj-II ligand whose corresponding R²⁰¹ and R²⁰² are defined to be one of selected from the following structures: R^D1, R^D3, R^D4, R^D5, R^D9, R^D10, R^D17, R^D22, R^D43, R^D50, R^D78, R^D116, R^D118, R^D133, R^D134, R^D135, R^D136, R^D143, R^D144, R^D145, R^D146, R^D149, R^D151, R^D154, R^D155R^D190, R^D193, R^D200, R^D201, R^D206, R^D210, R^D214, R^D215, R^D216, R^D218, R^D219, R^D220, R^D227, R^D237, R^D241, R^D242, R^D245, and R^D246.

In some embodiments, the compound is selected from the group consisting of only those compounds having one of the structures in the following LIST 12 for the L_Cj-I ligand:

In some embodiments, L_A is selected from the group consisting of the structures of LIST 1, LIST 2, and LIST 4, and L_B is selected from the group consisting of the structures of LIST 7, LIST 8, and LIST 9. In some embodiments, L_A is selected from the group consisting of the structures of LIST 1 and L_B is selected from the group consisting of the structures of LIST 9. In some embodiments, L_A is selected from the group consisting of the structures of LIST 2 and L_B is selected from the group consisting of the structures of LIST 9. In some embodiments, L_A is selected from LIST 4, and L_B is selected from the group consisting of the structures of LIST 9 of L_Bk wherein n is an integer from 1 to 474.

In some embodiments, the compound can be Ir(L_A)₂(L_B), or Ir(L_A)(L_B)₂. In some of these embodiments, L_A can have a Formula I as defined herein. In some of these embodiments, L_A can be selected from the group consisting of the structures of LIST 1, LIST 2, and LIST 4 as defined herein. In some of these embodiments, L_B can be selected from the group consisting of the structures of LIST 7, LIST 8, and LIST 9 as defined herein.

In some of these embodiments, the compound can be Ir(L_A)₂(L_Bk), Ir(L_A)(L_Bk)₂, Ir(L_A)(L_Bk)(L_Cj-I), or Ir(L_A)(L_Bk)(L_Cj-II). In some of these embodiments, the compound can be Ir(L_Ai(E^A)(R^K)(R^L)(R^M))₂(L_B), Ir(L_Ai(E^A)(R^K)(R^L)(R^M))(L_B)₂, Ir(L_Ai(E^A)(R^K)(R^L)(R^M))(L_B)(L_Cj-I), or Ir(L_Ai(E^A)(R^K)(R^L)(R^M))(L_B)(L_Cj-II). In some of these embodiments, the compound can be Ir(L_Ai(E^A)(R^K)(R^L)(R^M))₂ (L_Bk), Ir(L_Ai(E^A)(R^K)(R^L)(R^M))(L_Bk)₂, Ir(L_Ai(E^A)(R^K)(R^L)(R^M))(L_Bk)(L_Cj-I), or Ir(L_Ai(E^A)(R^K)(R^L)(R^M))(L_Bk)(L_Cj-II).

In some embodiments, the compound is selected from the group consisting of the structures of the following LIST 13:

In some embodiments, the compound has a formula Ir(L_AA)_x(L_BB)_y(L_CC)_z;

• • wherein x, y, z are each independently 0 or 1 or 2;
  • wherein x+y+z=3;
  • wherein L_AA has Formula IIIA:

• • wherein L_BB has a Formula IIIB:

• • wherein L_CC is a bidentate ligand;
  • wherein ring D′ is a 5-membered carbocyclic or heterocyclic ring;
  • wherein X¹-X¹⁶ are each independently C or N;
  • wherein Z¹ and Z² are each independently C or N;
  • wherein X¹-X⁴ is C if it is connected to moiety A;
  • wherein Y is selected from the group consisting of BR, BRR′, NR, PR, P(O)R, O, S, Se, C═O, C═S, C═Se, C═NR, C═CRR′, S═O, SO₂, CR, CRR′, SiRR′, and GeRR′;
  • wherein R¹, R², R³, R^D′, and R^E′ each independently represent mono to the maximum allowable substitution, or no substitution;
  • wherein each R¹, R², R³, R^D′, and R^E′ is independently a hydrogen or a substituent selected from the group consisting of the general substituents as defined herein;
  • wherein at least one R² or R³ comprises an electron-withdrawing group, a carbocyclic ring, a heterocyclic ring, a silyl group, or a germyl group; and
  • any two substituents may be optionally fused or joined to form a ring.

In some embodiments of Formula IIIA, at least one of R¹, R², or R³ is partially or fully deuterated. In some embodiments, at least one R¹ is partially or fully deuterated. In some embodiments, at least one R² is partially chor fully deuterated. In some embodiments, at least one R³ is partially or fully deuterated. In some embodiments, at least R or R′ if present is partially or fully deuterated.

In some embodiments of Formula IIIA, each of X⁹-X¹² is independently C. In some embodiments, one of X⁹-X¹² is N, and the remaining are C. In some embodiments, two of X⁹-X¹² are N, and the remaining are C.

In some embodiments of Formula IIIA, one of X¹ to X⁸ is N, and the remaining are C. In some embodiments, two of X¹ to X⁸ are N, and the reaming are C. In some embodiments, one of X¹ to X⁴ is N. In some embodiments, one of X⁵-X⁸ are N.

In some embodiments of Formula IIIA, at least one R² is/comprises an electron-withdrawing group. In some of these embodiments, at least one R² is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one R² is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one R² is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one R² is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one R² is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments, at least one R² is/comprise a carbocyclic ring. In some embodiments, at least one R² is/comprises a heterocyclic ring. In some embodiments, at least one R² is/comprises a silyl group. In some embodiments, at least one R² is/comprises a germyl group.

In some embodiments of Formula IIIA, at least one R³ is/comprises an electron-withdrawing group. In some of these embodiments, at least one R³ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one R³ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one R³ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one R³ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one R³ is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments, at least one R³ is/comprise a carbocyclic ring. In some embodiments, at least one R³ is/comprises a heterocyclic ring. In some embodiments, at least one R³ is/comprises a silyl group. In some embodiments, at least one R³ is/comprises a germyl group.

In some embodiments of Formula IIIA, the silyl group refers to a —Si(R_s)₃ radical, wherein each R_s can be same or different, while the germyl group refers to a —Ge(R_s)₃ radical, wherein each R_s can be same or different. In some of these embodiments, R_s can be hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, and combination thereof. Preferred R_s is selected from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl, and combination thereof.

In some embodiments, the silyl and germyl group can be independently selected from the group consisting of the following structures: SiMe₃, SiEt₃, Si(ⁱPr)₃, Si(^tBu)₃, SiPh₃, Si(CD₃)₃,

GeMe₃, GeEt₃, Ge(ⁱPr)₃, Ge(^tBu)₃, GePh₃, Ge(CD₃)₃,

In some embodiments, any two R can be joined or fused to form a ring. In some embodiments, the silyl and germyl group is selected from the group consisting of the following list:

In some embodiments, the silyl group is selected from the group consisting of

• • wherein each R^T independently represents mono to the maximum allowable substitutions, or no substitution;
  • each R^T is independently hydrogen or a substituent selected from the group consisting of the General Substituents defined herein; and
  • any two substituents may be joined or fused to form a ring.

In some embodiments, the Si atom in each of the above structure of the silyl group can be replaced with Ge.

In some embodiments of Formula IIIB, at least one of R^D′, or R^E′ is partially or fully deuterated. In some embodiments, at least one R^D′ is partially or fully deuterated. In some embodiments, at least one R^E′ is partially or fully deuterated.

In some embodiments of formula Ir(L_AA)_x(L_BB)_y(L_CC)_z, if ring D′ is imidazole, then x=2 and y=1.

In some embodiments of Formula IIIB, ring D′ is benzimidazole. In some embodiments, ring D′ is N-heterocyclic carbene.

In some embodiments of Formula IIIB, each of X¹³ to X¹⁶ is independently C. In some embodiments of Formula IIIB, one of X¹³ to X¹⁶ is N. In some embodiments, ring D′ may be imidazole, pyrazole, pyrrole, oxazole, furan, triazole, thiophene, or thiazole. In some embodiments, two R^D′ may be fused or joined to form a ring. In some embodiments, one R^D′ and one R^E′ may be joined to form a ring. In some embodiments, two R^E′ may be joined or fused to form a ring.

In some embodiments of Formula IIIB, at least one R^D′ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one R^D′ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one R^D′ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one R^D′ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one R^D′ is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments of Formula IIIB, at least one R^E′ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one R^E′ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one R^E′ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one R^E′ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one R^E′ is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments of Formula IIIA, ligand L_AA is selected from the group consisting of the structures of the following LIST 20:

In some embodiments, ligand L_AA is selected from the group consisting of the structures of the following structures LIST 21:

• • wherein R^AA, R^BB, and R^CC each independently represent mono to the maximum allowable substitution, or no substitution;
  • wherein each R^AA, R^BB, and R^CC is independently a hydrogen or a substituent selected from the group consisting of the general substituents as defined herein;
  • wherein at least one R^BB or R^CC comprises an electron-withdrawing group, a carbocyclic ring, a heterocyclic ring, a silyl group, or a germyl group; and
  • any two substituents may be optionally fused or joined to form a ring.

In some embodiments, ligand L_AA is selected from L_AAn(R^J)(R^K)(R^L)(R^M), wherein n is an integer from 1 to 28, and each L_AAn(R^J)(R^K)(R^L)(R^M) is defined below (LIST 22)

LAA	Structure of LAA	LAA	Structure of LAA
LAA1(RJ)(RK)(RL)(RM), wherein LAA1(R17)(R1)(R1)(R1) to LAA1(R100)(R100)(R100) (R100) have the structure		LAA2(RJ)(RK)(RL)(RM), wherein LAA2(R17)(R1)(R1)(R1) to LAA2(R100)(R100)(R100) (R100) have the structure
LAA3(RJ)(RK)(RL)(RM), wherein LAA3(R17)(R1)(R1)(R1) to LAA3(R100)(R100)(R100) (R100) have the structure		LAA4(RJ)(RK)(RL)(RM), wherein LAA4(R17)(R1)(R1)(R1) to LAA4(R100)(R100)(R100) (R100) have the structure
LAA5(RJ)(RK)(RL)(RM), wherein LAA5(R17)(R1)(R1)(R1) to LAA5(R100)(R100)(R100) (R100) have the structure		LAA6(RJ)(RK)(RL)(RM), wherein LAA6(R17)(R1)(R1)(R1) to LAA6(R100)(R100)(R100) (R100) have the structure
LAA7(RJ)(RK)(RL)(RM), wherein LAA7(R17)(R1)(R1)(R1) to LAA7(R100)(R100)(R100) (R100) have the structure		LAA8(RJ)(RK)(RL)(RM), wherein LAA8(R17)(R1)(R1)(R1) to LAA8(R100)(R100)(R100) (R100) have the structure
LAA9(RJ)(RK)(RL)(RM), wherein LAA9(R17)(R1)(R1)(R1) to LAA9(R100)(R100)(R100) (R100) have the structure		LAA10(RJ)(RK)(RL)(RM), wherein LAA10(R17)(R1)(R1)(R1) to LAA10(R100)(R100)(R100) (R100) have the structure
LAA11(RJ)(RK)(RL)(RM), wherein LAA11(R17)(R1)(R1)(R1) to LAA11(R100)(R100)(R100) (R100) have the structure		LAA12(RJ)(RK)(RL)(RM), wherein LAA12(R17)(R1)(R1)(R1) to LAA12(R100)(R100)(R100) (R100) have the structure
LAA13(RJ)(RK)(RL)(RM), wherein LAA13(R17)(R1)(R1)(R1) to LAA13(R100)(R100)(R100) (R100) have the structure		LAA14(RJ)(RK)(RL)(RM), wherein LAA14(R17)(R1)(R1)(R1) to LAA14(R100)(R100)(R100) (R100) have the structure
LAA15(RJ)(RK)(RL)(RM), wherein LAA15(R17)(R1)(R1)(R1) to LAA15(R100)(R100)(R100) (R100) have the structure		LAA16(RJ)(RK)(RL)(RM), wherein LAA16(R17)(R1)(R1)(R1) to LAA16(R100)(R100)(R100) (R100) have the structure
LAA17(RJ)(RK)(RL)(RM), wherein LAA17(R17)(R1)(R1)(R1) to LAA17(R100)(R100)(R100) (R100) have the structure		LAA18(RJ)(RK)(RL)(RM), wherein LAA18(R17)(R1)(R1)(R1) to LAA18(R100)(R100)(R100) (R100) have the structure
LAA19(RJ)(RK)(RL)(RM), wherein LAA19(R17)(R1)(R1)(R1) to LAA19(R100)(R100)(R100) (R100) have the structure		LAA20(RJ)(RK)(RL)(RM), wherein LAA20(R17)(R1)(R1)(R1) to LAA20(R100)(R100)(R100) (R100) have the structure
LAA21(RJ)(RK)(RL)(RM), wherein LAA21(R17)(R1)(R1)(R1) to LAA21(R100)(R100)(R100) (R100) have the structure		LAA22(RJ)(RK)(RL)(RM), wherein LAA22(R17)(R1)(R1)(R1) to LAA22(R100)(R100)(R100) (R100) have the structure
LAA23(RJ)(RK)(RL)(RM), wherein LAA23(R17)(R1)(R1)(R1) to LAA23(R100)(R100)(R100) (R100) have the structure		LAA24(RJ)(RK)(RL)(RM), wherein LAA24(R17)(R1)(R1)(R1) to LAA24(R100)(R100)(R100) (R100) have the structure
LAA25(RJ)(RK)(RL)(RM), wherein LAA25(R17)(R1)(R1)(R1) to LAA25(R100)(R100)(R100) (R100) have the structure		LAA26(RJ)(RK)(RL)(RM), wherein LAA26(R17)(R1)(R1)(R1) to LAA26(R100)(R100)(R100) (R100) have the structure
LAA27(RJ)(RK)(RL)(RM), wherein LAA27(R17)(R1)(R1)(R1) to LAA27(R100)(R100)(R100) (R100) have the structure		LAA28(RJ)(RK)(RL)(RM), wherein LAA28(R17)(R1)(R1)(R1) to LAA28(R100)(R100)(R100) (R100) have the structure

wherein R1 to R100 have the structures in the following LIST 22a

In some embodiments, ligand L_BB is selected from the group consisting of the structures of the following LIST 23:

• • wherein each X is independently C or N;
  • R^DD′, and R^EE′ each independently represent mono to the maximum allowable substitution, or no substitution;
  • wherein each R^NN′, R^DD′, and R^EE′ is independently a hydrogen or a substituent selected from the group consisting of the general substituents as defined herein; and
  • any two substituents may be optionally fused or joined to form a ring.

In some embodiments, ligand L_BB is selected from the group consisting of the structures of the following LIST 24:

In some embodiments, ligand L_BB is selected from L_BBw-(R^G)(R^H)(R^I)(Q^J), wherein w is an integer from 1 to 21, and each L_BBw-(R^G)(R^H)(R^I)(Q^J) is defined below in LIST 25:

LBB1-(RG)(RH)(RI)(QJ), wherein	LBB2-(RG)(RH)(RI)(QJ), wherein	LBB3-(RG)(RH)(RI)(QJ), wherein
LBB1-(1)(1)(1)(1) to LBB1-	LBB2-(1)(1)(1)(1) to LBB2-	LBB3-(1)(1)(1)(1) to LBB3-
(100)(100)(100)(70), having the	(100)(100)(100)(70), having the	(100)(100)(100)(70), having the
structure	structure	structure
LBB4-(RG)(RH)(RI)(QJ), wherein	LBB5-(RG)(RH)(RI)(QJ), wherein	LBB6-(RG)(RH)(RI)(QJ), wherein
LBB4-(1)(1)(1)(1) to LBB4-	LBB5-(1)(1)(1)(1) to LBB5-	LBB6-(1)(1)(1)(1) to LBB6-
(100)(100)(100)(70), having the	(100)(100)(100)(70), having the	(100)(100)(100)(70), having the
structure	structure	structure
LBB7-(RG)(RH)(RI)(QJ), wherein	LBB8-(RG)(RH)(RI)(QJ), wherein	LBB9-(RG)(RH)(RI)(QJ), wherein
LBB7-(1)(1)(1)(1) to LBB7-	LBB8-(1)(1)(1)(1) to LBB8-	LBB9-(1)(1)(1)(1) to LBB9-
(100)(100)(100)(70), having the	(100)(100)(100)(70), having the	(100)(100)(100)(70), having the
structure	structure	structure
LBB10-(RG)(RH)(RI)(QJ), wherein	LBB11-(RG)(RH)(RI)(QJ), wherein	LBB12-(RG)(RH)(RI)(QJ), wherein
LBB10-(1)(1)(1)(1) to LBB10-	LBB11-(1)(1)(1)(1) to LBB11-	LBB12-(1)(1)(1)(1) to LBB12-
(100)(100)(100)(70), having the	(100)(100)(100)(70), having the	(100)(100)(100)(70), having the
structure	structure	structure
LBB13-(RG)(RH)(RI)(QJ), wherein	LBB14-(RG)(RH)(RI)(QJ), wherein	LBB15-(RG)(RH)(RI)(QJ), wherein
LBB13-(1)(1)(1)(1) to LBB13-	LBB14-(1)(1)(1)(1) to LBB14-	LBB15-(1)(1)(1)(1) to LBB15-
(100)(100)(100)(70), having the	(100)(100)(100)(70), having the	(100)(100)(100)(70), having the
structure	structure	structure
LBB16-(RG)(RH)(RI)(QJ), wherein	LBB17-(RG)(RH)(RI)(QJ), wherein	LBB18-(RG)(RH)(RI)(QJ), wherein
LBB16-(1)(1)(1)(1) to LBB16-	LBB17-(1)(1)(1)(1) to LBB17-	LBB18-(1)(1)(1)(1) to LBB18-
(100)(100)(100)(70), having the	(100)(100)(100)(70), having the	(100)(100)(100)(70), having the
structure	structure	structure
LBB19-(RG)(RH)(RI)(QJ), wherein	LBB20-(RG)(RH)(RI)(QJ), wherein	LBB21-(RG)(RH)(RI)(QJ), wherein
LBB19-(1)(1)(1)(1) to LBB19-	LBB20-(1)(1)(1)(1) to LBB20-	LBB21-(1)(1)(1)(1) to LBB21-
(100)(100)(100)(70), having the	(100)(100)(100)(70), having the	(100)(100)(100)(70), having the
structure	structure	structure

• • wherein R1 to R100 have the same structures as defined in LIST 22a;
  • wherein Q1 to Q70 have the structures in the following LIST 25a:

In some embodiments, the compound can be Ir(L_AA)₂(L_BB), Ir(L_AA)(L_BB)₂, or Ir(L_AA)(L_BB)(L_CC). In some of these embodiments, L_AA can have a Formula IIIA as defined herein. In some of these embodiments, L_BB can have a Formula IIIB as defined herein. In some of these embodiments, L_AA can be selected from the group consisting of the structures of LIST 20, LIST 21, and LIST 22 as defined herein. In some of these embodiments, L_BB can be selected from the group consisting of the structures of LIST 23, LIST 24, and LIST 25 as defined herein. In some of these embodiments, the compound can be Ir(L_AAn(R^J)(R^K)(R^L)(R^M))₂(L_BB), Ir(L_AAn(R^J)(R^K)(R^L)(R^M))(L_BB)₂, Ir(L_A)₂(L_BBw- (R^G)(R^H)(R^I)(Q^J)), Ir(L_A)(L_BBw-(R^G)(R^H)(R^I)(Q^J))₂, Ir(L_AAn (R^J)(R^K)(R^L)(R^M))₂ (L_BBw-(R^G)(R^H)(R^I)(Q^J)), Ir(L_AAn(R^J)(R^K)(R^L)(R^M))(L_BBw-(R^G)(R^H)(R^I)(Q^J))₂. In some of these embodiments, L_CC can be any bidentate ligands such as acac and its derivatives, or phenylpyridine and its derivatives. In some of these embodiments, L_CC can have a Formula I or Formula II as defined herein. In some embodiments, L_CC can be selected from LIST, 1, LIST, 2, LIST 4, LIST 7, LIST 8, LIST 9, LIST 20, LIST 21, LIST 22, LIST 23, LIST 24, and LIST 25. In some embodiments, the compound can be Ir(L_AAn(R^J)(R^K)(R^L)(R^M))(L_BBw-(R^G)(R^H)(R^I)(Q^J)(L_Bk), wherein L_Bk is defined as LIST 9 herein.

In some embodiments, the compound is selected from the group consisting of the structures in the following LIST 26:

In some embodiments, the present disclosure also priveds a compound selected from the group consisting of the structures of the following LIST 27:

• • wherein each R^O, R^P, R^Q, R^R, R^S, R^T, and R^U is selected from R1 to R100 of LIST 22a defined herein;
  • wherein each R^V, R^W, R^X, R^Y, and R^Z is selected from R1 to R20 of LIST 22a defined herein; and
  • wherein R¹ to R100 have the same structures of LIST 22a defined herein.

In some embodiments, the present disclosure further provides a compound selected from the group consisting of the structures of the following LIST 28:

In some embodiments, the compound having a formula of Ir(L_AA)_x(L_BB)_y(L_CC)_z or Ir(L_A)_p(L_B)_q(L_C)_r described herein can be at least 30% deuterated, at least 40% deuterated, at least 50% deuterated, at least 60% deuterated, at least 70% deuterated, at least 80% deuterated, at least 90% deuterated, at least 95% deuterated, at least 99% deuterated, or 100% deuterated. As used herein, percent deuteration has its ordinary meaning and includes the percent of possible hydrogen atoms (e.g., positions that are hydrogen or deuterium) that are replaced by deuterium atoms.

In some embodiments of heteroleptic compound having the formula of Ir(L_AA)_x(L_BB)_y(L_CC)_z or formula M(L_A)_p(L_B)_q(L_C)_r as defined above, the ligand L_AA or L_A, respectively, has a first substituent R¹, where the first substituent R^I has a first atom a-I that is the farthest away from the metal M among all atoms in the ligand L_AA or L_A, respectively. Additionally, the ligand L_BB or L_B, if present, has a second substituent R^II, where the second substituent R^II has a first atom a-II that is the farthest away from the metal M among all atoms in the ligand L_BB or L_B, respectively. Furthermore, the ligand L_CC or L_C, if present, has a third substituent R^III, where the third substituent R^III has a first atom a-III that is the farthest away from the metal M among all atoms in the ligand L_CC or L_C, respectively.

In such heteroleptic compounds, vectors V_D1, V_D2, and V_D3 can be defined that are defined as follows. V_D1 represents the direction from the metal M to the first atom a-I and the vector V_D1 has a value D¹ that represents the straight line distance between the metal M and the first atom a-I in the first substituent R^I. V_D2 represents the direction from the metal M to the first atom a-II and the vector V_D2 has a value D² that represents the straight line distance between the metal M and the first atom a-II in the second substituent R^II. V_D3 represents the direction from the metal M to the first atom a-III and the vector V_D3 has a value D³ that represents the straight line distance between the metal M and the first atom a-III in the third substituent R^III.

In such heteroleptic compounds, a sphere having a radius r is defined whose center is the metal M and the radius r is the smallest radius that will allow the sphere to enclose all atoms in the compound that are not part of the substituents R^I, R^II and R^III; and where at least one of D¹, D², and D³ is greater than the radius r by at least 1.5 Å. In some embodiments, at least one of D¹, D², and D³ is greater than the radius r by at least 2.9, 3.0, 4.3, 4.4, 5.2, 5.9, 7.3, 8.8, 10.3, 13.1, 17.6, or 19.1 Å.

In some embodiments of such heteroleptic compounds, the compound has a transition dipole moment axis and angles are defined between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3, where at least one of the angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 is less than 40°. In some embodiments, at least one of the angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 is less than 30°. In some embodiments, at least one of the angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 is less than 20°. In some embodiments, at least one of the angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 is less than 15°. In some embodiments, at least one of the angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 is less than 10°. In some embodiments, at least two of the angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 are less than 20°. In some embodiments, at least two of the angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 are less than 15°. In some embodiments, at least two of the angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 are less than 10°.

In some embodiments, all three angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 are less than 20°. In some embodiments, all three angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 are less than 15°. In some embodiments, all three angles between the transition dipole moment axis and the vectors V_D1, V_D2, and V_D3 are less than 10°.

In some embodiments of such heteroleptic compounds, the compound has a vertical dipole ratio (VDR) of 0.33 or less. In some embodiments of such heteroleptic compounds, the compound has a VDR of 0.30 or less. In some embodiments of such heteroleptic compounds, the compound has a VDR of 0.25 or less. In some embodiments of such heteroleptic compounds, the compound has a VDR of 0.20 or less. In some embodiments of such heteroleptic compounds, the compound has a VDR of 0.15 or less.

One of ordinary skill in the art would readily understand the meaning of the terms transition dipole moment axis of a compound and vertical dipole ratio of a compound. Nevertheless, the meaning of these terms can be found in U.S. Pat. No. 10,672,997 whose disclosure is incorporated herein by reference in its entirety. In U.S. Pat. No. 10,672,997, horizontal dipole ratio (HDR) of a compound, rather than VDR, is discussed. However, one skilled in the art readily understands that VDR=1−HDR.

In some embodiments, the compound has the Formula II:

wherein:

• • M¹ is Pd or Pt;
  • moieties E and F are each independently monocyclic or polycyclic ring structure comprising 5-membered and/or 6-membered carbocyclic or heterocyclic rings;
  • Z^1′ and Z^2′ are each independently C or N;
  • K¹ and K² are each independently selected from the group consisting of a direct bond, O, and S, wherein at least one of K, K¹, and K² are direct bonds;
  • L¹, L², and L³ are each independently absent or selected the group consisting of a direct bond, BR, BRR′, NR, PR, P(O)R, O, S, Se, C═O, C═S, C═Se, C═NR, C═CRR′, S═O, SO₂, CR, CRR′, SiRR′, GeRR′, alkylene, cycloalkyl, aryl, cycloalkylene, arylene, heteroarylene, and combinations thereof, wherein at least one of L¹ and L² is present;
  • R^E and R^F each independently represents zero, mono, or up to a maximum allowed number of substitutions to its associated ring;
  • each of R, R′, R^E, and R^F is independently a hydrogen or a substituent selected from the group consisting of the General Substituents defined herein; and
  • any two R, R′, R¹, R², R³, R^E, and R^F can be joined or fused together to form a ring where chemically feasible.

In some embodiments of Formula II, at least one of R¹, R², R³, R^E, or R^E is partially or fully deuterated. In some embodiments, at least one R¹ is partially or fully deuterated. In some embodiments, at least one R² is partially chor fully deuterated. In some embodiments, at least one R³ is partially or fully deuterated. In some embodiments, at least one R^E is partially or fully deuterated. In some embodiments, at least one R^F is partially or fully deuterated. In some embodiments, at least R or R′ if present is partially or fully deuterated.

In some embodiments of Formula II, at least one of R¹, R², R³, R^E, or R^F is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one of R¹, R², R³, R^E, or R^F is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one of R¹, R², R³, R^E, or R^F is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one of R¹, R², R³, R^E, or R^F is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one of R¹, R², R³, R^E, or R^F is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments of Formula II, at least one R¹ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one R¹ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one R¹ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one R¹ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one R¹ is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments of Formula II, at least one R² is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one R² is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one R² is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one R² is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one R² is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments of Formula II, at least one R³ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one R³ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one R³ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one R³ is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one R³ is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments of Formula II, at least one R^E is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one R^E is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one R^E is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one R^E is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one R^E is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments of Formula II, at least one R^F is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, at least one R^F is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, at least one R^F is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, at least one R^F is or comprises an electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, at least one R^F is or comprises an electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments of Formula II, Formula II comprises at least one electron-withdrawing group selected from the group consisting of the structures of LIST EWG1 defined herein. In some embodiments, Formula II comprises at least one electron-withdrawing group selected from the group consisting of the structures of LIST EWG2 defined herein. In some embodiments, Formula II comprises at least one electron-withdrawing group selected from the group consisting of the structures of LIST EWG3 defined herein. In some embodiments, Formula II comprises at least one electron-withdrawing group selected from the group consisting of the structures of LIST EWG4 defined herein. In some embodiments, Formula II comprises at least one electron-withdrawing group that is a π-electron deficient electron-withdrawing group selected from the group consisting of the structures of LIST Pi-EWG defined herein.

In some embodiments, each of R, R′, R^E, and R^F is independently a hydrogen or a substituent selected from the group consisting of the Preferred General Substituents defined herein.

In some embodiments of Formula II, moiety E and moiety F are both 6-membered aromatic rings.

In some embodiments of Formula II, moiety F is a 5-membered or 6-membered heteroaromatic ring.

In some embodiments of Formula II, L¹ is O or CRR′.

In some embodiments of Formula II, Z^2′ is N and Z^1′ is C. In some embodiments of Formula II, Z^2′ is C and Z^1′ is N.

In some embodiments of Formula II, L² is a direct bond. In some embodiments of Formula II, L² is NR.

In some embodiments of Formula II, K¹ and K² are both direct bonds. In some embodiments of Formula II, one of K¹ or K² is O.

In some embodiments of Formula II, the compound is selected from the group consisting of the compounds having the formula of Pt(L_A′)(Ly):

wherein ligand L_A′ is selected from the group consisting of L_A′i′(E^A)(R^K)(R^L)(R^M), wherein i′ is an integer from 1 to 69, E^A is a moiety selected from E1 to E140, and each of R^K, R^L, and R^M is independently selected from R1 to R50; wherein L_A′1(E¹)(R¹)(R¹)(R¹) to L_A′69 (E¹⁴⁰)(R⁵⁰)(R⁵⁰)(R⁵⁰) have the structures defined in the following LIST 14:

LA'	Structure of LA'	LA'	Structure of LA'
LA'1(EA)(RK) (RL)(RM), wherein LA'1(E1)(R1) (R1)(R1) to LA'1(E140)(R50) (R50)(R50) have the structure		LA'2(EA)(RK) (RL)(RM), wherein LA'2(E1)(R1) (R1)(R1) to LA'2(E140) (R50)(R50) (R50) have the structure
LA'3(EA)(RK) (RL)(RM), wherein LA'3(E1)(R1) (R1)(R1) to LA'3(E140) (R50)(R50) (R50) have the structure		LA'4(EA)(RK) (RL)(RM), wherein LA'4(E1)(R1) (R1)(R1) to LA'4(E140) (R50)(R50) (R50) have the structure
LA'5(EA)(RK)( RL)(RM), wherein LA'5(E1)(R1) (R1)(R1) to LA'5(E140) (R50)(R50) (R50) have the structure		LA'6(EA)(RK) (RL)(RM), wherein LA′6(E1)(R1) (R1)(R1) to LA'6(E140) (R50)(R50) (R50) have the structure
LA'7(EA)(RK) (RL)(RM), wherein LA'7(E1)(R1) (R1)(R1) to LA'7(E140) (R50)(R50) (R50) have the structure		LA'8(EA)(RK) (RL)(RM), wherein LA'8(E1)(R1) (R1)(R1) to LA'8(E140) (R50)(R50) (R50) have the structure
LA'9(EA)(RK) (RL)(RM), wherein LA'9(E1)(R1) (R1)(R1) to LA′9(E140) (R50)(R50) (R50) have the structure		LA'10(EA)(RK) (RL)(RM), wherein LA'10(E1)(R1) (R1)(R1) to LA'10(E140) (R50)(R50) (R50) have the structure
LA'11(EA)(RK) (RL)(RM), wherein LA'11(E1)(R1) (R1)(R1) to LA'11(E140) (R50)(R50) (R50) have the structure		LA'12(EA)(RK) (RL)(RM), wherein LA'12(E1)(R1) (R1)(R1) to LA'12(E140) (R50)(R50) (R50) have the structure
LA'13(EA)(RK) (RL)(RM), wherein LA'13(E1)(R1) (R1)(R1) to LA'13(E140) (R50)(R50) (R50) have the structure		LA'14(EA)(RK) (RL)(RM), wherein LA'14(E1)(R1) (R1)(R1) to LA'14(E140) (R50)(R50) (R50) have the structure
LA'15(EA)(RK) (RL)(RM), wherein LA'15(E1)(R1) (R1)(R1) to LA'15(E140) (R50)(R50) (R50) have the structure		LA'16(EA)(RK) (RL)(RM), wherein LA'16(E1)(R1) (R1)(R1) to LA'16(E140) (R50)(R50) (R50) have the structure
LA'17(EA)(RK) (RL)(RM), wherein LA'17(E1)(R1) (R1)(R1) to LA'17(E140 )(R50)(R50) (R50) have the structure		LA'18(EA)(RK)( RL)(RM), wherein LA'18(E1)(R1) (R1)(R1) to LA'18(E140) (R50)(R50) (R50) have the structure
LA'19(EA)(RK) (RL)(RM), wherein LA'19(E1)(R1) (R1)(R1) to LA'19(E140) (R50)(R50) (R50) have the structure		LA'20(EA)(RK) (RL)(RM), wherein LA′20(E1)(R1) (R1)(R1) to LA′20(E140) (R50)(R50) (R50) have the structure
LA'21(EA)(RK) (RL)(RM), wherein LA'21(E1)(R1) (R1)(R1) to LA'21(E140) (R50)(R50) (R50) have the structure		LA'22(EA)(RK) (RL)(RM), wherein LA'22(E1)(R1) (R1)(R1) to LA'22(E140) (R50)(R50) (R50) have the structure
LA'23(EA)(RK) (RL)(RM), wherein LA'23(E1)(R1) (R1)(R1) to LA'23(E140) (R50)(R50) (R50) have the structure		LA'24(EA)(RK) (RL)(RM), wherein LA'24(E1)(R1) (R1)(R1) to LA'24(E140) (R50)(R50) (R50) have the structure
LA'25(EA)(RK) (RL)(RM), wherein LA'25(E1)(R1) (R1)(R1) to LA′25(E140) (R50)(R50) (R50) have the structure		LA'26(EA)(RK) (RL)(RM), wherein LA'26(E1)(R1) (R1)(R1) to LA'26(E140 )(R50)(R50) (R50) have the structure
LA'27(EA)(RK) (RL)(RM), wherein LA'27(E1)(R1) (R1)(R1) to LA'27(E140) (R50)(R50) (R50) have the structure		LA'28(EA)(RK) (RL)(RM), wherein LA'28(E1)(R1) (R1)(R1) to LA′28(E140) (R50)(R50) (R50) have the structure
LA'29(EA)(RK) (RL)(RM), wherein LA'29(E1)(R1) (R1)(R1) to LA'29(E140) (R50)(R50) (R50) have the structure		LA'30(EA)(RK) (RL)(RM), wherein LA'30(E1)(R1) (R1)(R1) to LA'30(E140) (R50)(R50) (R50) have the structure
LA'31(EA)(RK) (RL)(RM), wherein LA'31(E1)(R1) (R1)(R1) to LA'31(E140) (R50)(R50) (R50) have the structure		LA'32(EA)(RK) (RL)(RM), wherein LA'32(E1)(R1) (R1)(R1) to LA'32(E140) (R50)(R50) (R50) have the structure
LA'33(EA)(RK) (RL)(RM), wherein LA'33(E1)(R1) (R1)(R1) to LA'33(E140) (R50)(R50) (R50) have the structure		LA'34(EA)(RK) (RL)(RM), wherein LA'34(E1)(R1) (R1)(R1) to LA'34(E140) (R50)(R50) (R50) have the structure
LA'35(EA)(RK) (RL)(RM), wherein LA'35(E1)(R1) (R1)(R1) to LA'35(E140) (R50)(R50) (R50) have the structure		LA'36(EA)(RK) (RL)(RM), wherein LA'36(E1)(R1) (R1)(R1) to LA'36(E140) (R50)(R50) (R50) have the structure
LA'37(EA)(RK) (RL)(RM), wherein LA'37(E1)(R1) (R1)(R1) to LA'37(E140) (R50)(R50) (R50) have the structure		LA'38(EA)(RK) (RL)(RM), wherein LA'38(E1)(R1) (R1)(R1) to LA'38(E140) (R50)(R50) (R50) have the structure
LA'39(EA)(RK) (RL)(RM), wherein LA'39(E1)(R1) (R1)(R1) to LA'39(E140) (R50)(R50) (R50) have the structure		LA'40(EA)(RK) (RL)(RM), wherein LA′40(E1)(R1) (R1)(R1) to LA′40(E140) (R50)(R50) (R50) have the structure
LA'41(EA)(RK) (RL)(RM), wherein LA'41(E1)(R1) (R1)(R1) to LA'41(E140) (R50)(R50) (R50) have the structure		LA'42(EA)(RK) (RL)(RM), wherein LA'42(E1)(R1) (R1)(R1) to LA'42(E140) (R50)(R50) (R50) have the structure
LA'43(EA)(RK) (RL)(RM), wherein LA'43(E1)(R1) (R1)(R1) to LA'43(E140) (R50)(R50) (R50) have the structure		LA'44(EA)(RK) (RL)(RM), wherein LA'44(E1)(R1) (R1)(R1) to LA'44(E140) (R50)(R50) (R50) have the structure
LA'45(EA)(RK) (RL)(RM), wherein LA'45(E1)(R1) (R1)(R1) to LA'45(E140) (R50)(R50) (R50) have the structure		LA'46(EA)(RK) (RL)(RM), wherein LA'46(E1)(R1) (R1)(R1) to LA'46(E140) (R50)(R50) (R50) have the structure
LA'47(EA)(RK) (RL)(RM), wherein LA'47(E1)(R1) (R1)(R1) to LA'47(E140) (R50)(R50) (R50) have the structure		LA'48(EA)(RK) (RL)(RM), wherein LA'48(E1)(R1) (R1)(R1) to LA′48(E140) (R50)(R50) (R50) have the structure
LA'49(EA)(RK) (RL)(RM), wherein LA'49(E1)(R1) (R1)(R1) to LA'49(E140) (R50)(R50) (R50) have the structure		LA'50(EA)(RK) (RL)(RM), wherein LA'50(E1)(R1) (R1)(R1) to LA'50(E140) (R50)(R50) (R50) have the structure
LA'51(EA)(RK) (RL)(RM), wherein LA'51(E1)(R1) (R1)(R1) to LA'51(E140) (R50)(R50) (R50) have the structure		LA'52(EA)(RK) (RL)(RM), wherein LA'52(E1)(R1) (R1)(R1) to LA'52(E140) (R50)(R50) (R50) have the structure
LA'53(EA)(RK) (RL)(RM), wherein LA'53(E1)(R1) (R1)(R1) to LA'53(E140) (R50)(R50) (R50) have the structure		LA'54(EA)(RK) (RL)(RM), wherein LA'54(E1)(R1) (R1)(R1) to LA'54(E140) (R50)(R50) (R50) have the structure
LA'55(EA)(RK) (RL)(RM), wherein LA'55(E1)(R1) (R1)(R1) to LA'55(E140) (R50)(R50) (R50) have the structure		LA'56(EA)(RK) (RL)(RM), wherein LA'56(E1)(R1) (R1)(R1) to LA'56(E140) (R50)(R50) (R50) have the structure
LA'57(EA)(RK) (RL)(RM), wherein LA'57(E1)(R1) (R1)(R1) to LA'57(E140) (R50)(R50) (R50) have the structure		LA'58(EA)(RK) (RL)(RM), wherein LA'58(E1)(R1) (R1)(R1) to LA'58(E140) (R50)(R50) (R50) have the structure
LA'59(EA)(RK) (RL)(RM), wherein LA'59(E1)(R1) (R1)(R1) to LA'59(E140) (R50)(R50) (R50) have the structure		LA'60(EA)(RK) (RL)(RM), wherein LA'60(E1)(R1) (R1)(R1) to LA'60(E140) (R50)(R50) (R50) have the structure
LA'61(EA)(RK) (RL)(RM), wherein LA'61(E1)(R1) (R1)(R1) to LA'61(E140) (R50)(R50) (R50) have the structure		LA'62(EA)(RK) (RL)(RM), wherein LA'62(E1)(R1) (R1)(R1) to LA'62(E140) (R50)(R50) (R50) have the structure
LA'63(EA)(RK) (RL)(RM), wherein LA'63(E1)(R1) (R1)(R1) to LA'63(E140) (R50)(R50) (R50) have the structure		LA'64(EA)(RK) (RL)(RM), wherein LA'64(E1)(R1) (R1)(R1) to LA'64(E140) (R50)(R50) (R50) have the structure
LA'65(EA)(RK) (RL)(RM), wherein LA'65(E1)(R1) (R1)(R1) to LA'65(E140) (R50)(R50) (R50) have the structure		LA'66(EA)(RK) (RL)(RM), wherein LA'66(E1)(R1) (R1)(R1) to LA'66(E140) (R50)(R50) (R50) have the structure
LA'67(EA)(RK) (RL)(RM), wherein LA'67(E1)(R1) (R1)(R1) to LA'67(E140) (R50)(R50) (R50) have the structure		LA'68(EA)(RK) (RL)(RM), wherein LA'68(E1)(R1) (R1)(R1) to LA'68(E140) (R50)(R50) (R50) have the structure
LA'69(EA)(RK) (RL)(RM), wherein LA'69(E1)(R1) (R1)(R1) to LA'69(E140) (R50)(R50) (R50) have the structure

wherein L_y is selected from the group consisting of L_yj-(Rs)(Rt)(Ru), wherein j is an integer from 1 to 42, each of s, t, and u is independently an integer from 1′ to 128′, and wherein each of L_y1-(R1′)(R1′)(R1′) to L_y42-(R128′)(R128′)(R128′) is defined by the structures of the following LIST 15:

R	Structure of Ly	Ly	Structure of Ly
Ly1-(Rs)(Rt)(Ru), wherein Ly1- (R1′)(R1′)(R1′) to Ly1- (R128′)(R128′)(R128′) have the structure		Ly22-(Rs)(Rt)(Ru), wherein Ly22- (R1′)(R1′)(R1′) to Ly22- (R128′)(R128′)(R128′) have the structure
Ly2-(Rs)(Rt)(Ru), wherein Ly2- (R1′)(R1′)(R1′) to Ly2- (R128′)(R128′)(R128′) have the structure		Ly23-(Rs)(Rt)(Ru), wherein Ly23- (R1′)(R1′)(R1′) to Ly23- (R128′)(R128′)(R128′) have the structure
Ly3-(Rs)(Rt)(Ru), wherein Ly3- (R1′)(R1′)(R1′) to Ly3- (R128′)(R128′)(R128′) have the structure		Ly24-(Rs)(Rt)(Ru), wherein Ly24- (R1′)(R1′)(R1′) to Ly24- (R128′)(R128′)(R128′) have the structure
Ly4-(Rs)(Rt)(Ru), wherein Ly4- (R1′)(R1′)(R1′) to Ly4- (R128′)(R128′)(R128′) have the structure		Ly25-(Rs)(Rt)(Ru), wherein Ly25- (R1′)(R1′)(R1′) to Ly25- (R128′)(R128′)(R128′) have the structure
Ly5-(Rs)(Rt)(Ru), wherein Ly5- (R1′)(R1′)(R1′) to Ly5- (R128′)(R128′)(R128′) have the structure		Ly26-(Rs)(Rt)(Ru), wherein Ly26- (R1′)(R1′)(R1′) to Ly26- (R128′)(R128′)(R128′) have the structure
Ly6-(Rs)(Rt)(Ru), wherein Ly6- (R1′)(R1′)(R1′) to Ly6- (R128′)(R128′)(R128′) have the structure		Ly27-(Rs)(Rt)(Ru), wherein Ly27- (R1′)(R1′)(R1′) to Ly27- (R128′)(R128′)(R128′) have the structure
Ly7-(Rs)(Rt)(Ru), wherein Ly7- (R1′)(R1′)(R1′) to Ly7- (R128′)(R128′)(R128′) have the structure		Ly28-(Rs)(Rt)(Ru), wherein Ly28- (R1′)(R1′)(R1′) to Ly28- (R128′)(R128′)(R128′) have the structure
Ly8-(Rs)(Rt)(Ru), wherein Ly8- (R1′)(R1′)(R1′) to Ly8- (R128′)(R128′)(R128′) have the structure		Ly29-(Rs)(Rt)(Ru), wherein Ly29- (R1′)(R1′)(R1′) to Ly29- (R128′)(R128′)(R128′) have the structure
Ly9-(Rs)(Rt)(Ru), wherein Ly9- (R1′)(R1′)(R1′) to Ly9- (R128′)(R128′)(R128′) have the structure		Ly30-(Rs)(Rt)(Ru), wherein Ly30- (R1′)(R1′)(R1′) to Ly30- (R128′)(R128′)(R128′) have the structure
Ly10-(Rs)(Rt)(Ru), wherein Ly10- (R1′)(R1′)(R1′) to Ly10- (R128′)(R128′)(R128′) have the structure		Ly31-(Rs)(Rt)(Ru), wherein Ly31- (R1′)(R1′)(R1′) to Ly31- (R128′)(R128′)(R128′) have the structure
Ly11-(Rs)(Rt)(Ru), wherein Ly11- (R1′)(R1′)(R1′) to Ly11- (R128′)(R128′)(R128′) have the structure		Ly32-(Rs)(Rt)(Ru), wherein Ly32- (R1′)(R1′)(R1′) to Ly32- (R128′)(R128′)(R128′) have the structure
Ly12-(Rs)(Rt)(Ru), wherein Ly12- (R1′)(R1′)(R1′) to Ly12- (R128′)(R128′)(R128′) have the structure		Ly33-(Rs)(Rt)(Ru), wherein Ly33- (R1′)(R1′)(R1′) to Ly33- (R128′)(R128′)(R128′) have the structure
Ly13-(Rs)(Rt)(Ru), wherein Ly13-(R1′) (R1′)( R1′) to Ly13- (R128′)(R128′)(R128′) have the structure		Ly34-(Rs)(Rt)(Ru), wherein Ly34- (R1′)(R1′)(R1′) to Ly34- (R128′)(R128′)(R128′) have the structure
Ly14-(Rs)(Rt) Ru), wherein Ly14- (R1′)(R1′)(R1′) to Ly14- (R128′)(R128′)(R128′) have the structure		Ly35-(Rs)(Rt)(Ru), wherein Ly35- (R1′)(R1′)(R1′) to Ly35- (R128′)(R128′)(R128′) have the structure
Ly15-(Rs)(Rt)(Ru), wherein Ly15- (R1′)(R1′)(R1′) to Ly15- (R128′)(R128′)(R128′) have the structure		Ly36-(Rs)(Rt)(Ru), wherein Ly36- (R1′)(R1′)(R1′) to Ly36- (R128′)(R128′)(R128′) have the structure
Ly16-(Rs)(Rt)(Ru), wherein Ly16- (R1′)(R1′)(R1′) to Ly16- (R128′)(R128′)(R128′) have the structure		Ly37-(Rs)(Rt)(Ru), wherein Ly37- (R1′)(R1′)(R1′) to Ly37- (R128′)(R128′)(R128′) have the structure
Ly17-(Rs)(Rt)(Ru), wherein Ly17- (R1′)(R1′)(R1′) to Ly17- (R128′)(R128′)(R128′) have the structure		Ly38-(Rs)(Rt)(Ru), wherein Ly38- (R1′)(R1′)(R1′) to Ly38- (R128′)(R128′)(R128′) have the structure
Ly18-(Rs)(Rt)(Ru), wherein Ly18- (R1′)(R1′)(R1′) to Ly18- (R128′)(R128′)(R128′) have the structure		Ly39-(Rs)(Rt)(Ru), wherein Ly39- (R1′)(R1′)(R1′) to Ly39- (R128′)(R128′)(R128′) have the structure
Ly19-(Rs)(Rt)(Ru), wherein Ly19- (R1′)(R1′)(R1′) to Ly19- (R128′)(R128′)(R128′) have the structure		Ly40-(Rs)(Rt)(Ru), wherein Ly40- (R1′)(R1′)(R1′) to Ly40- (R128′)(R128′)(R128′) have the structure
Ly20-(Rs)(Rt)(Ru), wherein Ly20- (R1′)(R1′)(R1′) to Ly20- (R128′)(R128′)(R128′) have the structure		Ly41-(Rs)(Rt)(Ru), wherein Ly41- (R1′)(R1′)(R1′) to Ly41- (R128′)(R128′)(R128′) have the structure
Ly21-(Rs)(Rt)(Ru), wherein Ly21- (R1′)(R1′)(R1′) to Ly21- (R128′)(R128′)(R128′) have the structure		Ly42-(Rs)(Rt)(Ru), wherein Ly42- (R1′)(R1′)(R1′) to Ly42- (R128′)(R128′)(R128′) have the structure

• • wherein R1 to R50 have the structures defined in LIST 5 defined herein;
  • wherein E1 to E140 have the structures defined in LIST 6 defined herein;
  • wherein R1′ to R128′ have the structures in the following LIST 16:

R# Structure
R1′
R2′
R3′
R4′
R5′
R′6′
R7′
R8′
R9′
R10′
R11′
R12′
R13′
R14′
R15′
R16′
R17′
R18′
R19′
R20′
R21′
R22′
R23′
R24′
R25′
R26′
R27′
R28′
R29′
R30′
R31′
R32′
R33′
R34′
R35′
R36′
R37′
R38′
R39′
R40′
R41′
R42′
R43′
R44′
R45′
R46′
R47′
R48′
R49′
R50′
R51′
R52′
R53′
R54′
R55′
R56′
R57′
R58′
R59′
R60′
R61′
R62′
R63′
R64′
R65′
R66′
R67′
R68′
R69′
R70′
R71′
R72′
R73′
R74′
R75′
R76′
R77′
R78′
R79′
R80′
R81′
R82′
R83′
R84′
R85′
R86′
R87′
R88′
R89′
R90′
R91′
R92′
R93′
R94′
R95′
R96′
R97′
R98′
R99′
R100′
R101′
R102′
R103′
R104′
R105′
R106′
R107′
R108′
R109′
R110′
R111′
R112′
R113′
R114′
R115′
R116′
R117′
R118′
R119′
R120′
R121′
R122′
R123′
R124′
R125′
R126′
R127′
R128′

In some embodiments, the compound is selected from the group consisting of the structures of the following LIST 17:

In some embodiments, the compound described here has a lowest triplet (T₁) excited state, a percentage of metal-to-ligand charge transfer ³MLCT (P1), and a percentage of ligand-centered ³LC involved in T₁ state (P2); wherein P2 is equal to or larger than 55%. In some embodiments, P2 is equal to or larger than 57%. In some embodiments, P2 is equal to or larger than 59%. In some embodiments, P2 is equal to or larger than 61%. A parameter T is defined as the product of P1 and P2 (T=P1×P2). In some embodiments, T is equal to or larger than 0.095. In some embodiments, T is equal to or larger than 0.100. In some embodiments, T is equal to or larger than 0.105. In some embodiments, T is equal to or larger than 0.110.

DFT calculations were performed to determine the energy of the lowest triplet (T₁) excited state, and the percentage of metal-to-ligand charge transfer (³MLCT), P1, and ligand-centered (³LC) involved in T₁ of the compounds, P2. The data was gathered using the program Gaussian16. Geometries were optimized using B3LYP functional and CEP-31G basis set. Excited state energies were computed by TDDFT at the optimized ground state geometries. THF solvent was simulated using a self-consistent reaction field to further improve agreement with the experiment. Metal-to-ligand charge transfer (³MLCT) and ligand-centered (³LC) contributions were determined via transition density matrix analysis of the excited states.

The calculations obtained with the above-identified DFT functional set and basis set are theoretical. Computational composite protocols, such as the Gaussian16 with B3LYP and CEP-31G protocol used herein, rely on the assumption that electronic effects are additive and, therefore, larger basis sets can be used to extrapolate to the complete basis set (CBS) limit. However, when the goal of a study is to understand variations in HOMO, LUMO, S₁, T₁, bond dissociation energies, etc. over a series of structurally-related compounds, the additive effects are expected to be similar. Accordingly, while absolute errors from using the B3LYP may be significant compared to other computational methods, the relative differences between the HOMO, LUMO, S₁, T₁, and bond dissociation energy values calculated with B3LYP protocol are expected to reproduce experiment quite well. See, e.g., Hong et al., Chem. Mater. 2016, 28, 5791-98, 5792-93 and Supplemental Information (discussing the reliability of DFT calculations in the context of OLED materials). Moreover, with respect to iridium or platinum complexes that are useful in the OLED art, the data obtained from DFT calculations correlate very well to actual experimental data. See Tavasli et al., J. Mater. Chem. 2012, 22, 6419-29, 6422 (Table 3) (showing DFT calculations closely correlating with actual data for a variety of emissive complexes); Morello, G. R., J. Mol. Model. 2017, 23:174 (studying of a variety of DFT functional sets and basis sets and concluding the combination of B3LYP and CEP-31G is particularly accurate for emissive complexes). The determination of excited state transition character is performed as a post-processing step on the above-mentioned DFT and TDDFT calculations. This analysis allows for decomposition of the excited state into the hole, i.e., where the excitation originates, and the electron, i.e., the final location of the excited state; see Martin, J. Chem. Phys. 2003, 118, 4775 (discussing the theoretical background and implementation of natural transition orbitals). Additionally, as this analysis is performed on a calculated property it is objective and repeatable; see Mai et al., Coord. Chem. Rev. 2018, 361, 74-97 (discussing the theoretical basis of the excited state decomposition in transition metal complexes).

C. The OLEDs and the Devices of the Present Disclosure

In another aspect, the present disclosure also provides an OLED device comprising a first organic layer that contains a compound as disclosed in the above compounds section of the present disclosure.

In some embodiments, the OLED comprises: an anode; a cathode; and an organic layer disposed between the anode and the cathode, where the organic layer comprises a compound having a formula of Ir(L_AA)_x(L_BB)_y(L_CC)_z or a compound comprising a first ligand L_A having a structure of Formula I as described herein.

In some embodiments, the organic layer may be an emissive layer and the compound as described herein may be an emissive dopant or a non-emissive dopant.

In some embodiments, the emissive layer comprises one or more quantum dots.

In some embodiments, the organic layer may further comprise a host, wherein the host comprises a triphenylene containing benzo-fused thiophene or benzo-fused furan, wherein any substituent in the host is an unfused substituent independently selected from the group consisting of C_nH₂₊₁, OC_nH₂₊₁, OAr₁, N(C_nH_2n+1)₂, N(Ar₁)(Ar₂), CH═CH—C_nH_2n+1, C≡CC_nH_2n+1, Ar₁, Ar₁—Ar₂, C_nH_2n—Ar₁, or no substitution, wherein n is an integer from 1 to 10; and wherein Ar₁ and Ar₂ are independently selected from the group consisting of benzene, biphenyl, naphthalene, triphenylene, carbazole, and heteroaromatic analogs thereof.

In some embodiments, the organic layer may further comprise a host, wherein host comprises at least one chemical group selected from the group consisting of triphenylene, carbazole, indolocarbazole, dibenzothiophene, dibenzofuran, dibenzoselenophene, 5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene, triazine, boryl, silyl, aza-triphenylene, aza-carbazole, aza-indolocarbazole, aza-dibenzothiophene, aza-dibenzofuran, aza-dibenzoselenophene, aza-5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, and aza-(5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene).

In some embodiments, the host may be selected from the HOST Group 1 consisting of:

wherein:

• • each of X¹ to X²⁴ is independently C or N;
  • L′ is a direct bond or an organic linker;
  • each Y^A is independently selected from the group consisting of absent a bond, O, S, Se, CRR′, SiRR′, GeRR′, NR, BR, BRR′;
  • each of R^A′, R^B′, R^C′, R^D′, R^E′, R^F′ and R^G′ independently represents mono, up to the maximum substitutions, or no substitutions;
  • each R, R′, R^A′, R^B′, R^C′, R^D′, R^E′, R^F′ and R^G′ is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, selenyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroalyl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, bolyl, and combinations thereof; wherein the organic layer further comprises a host,
  • two adjacent of R^A′, R^B′, R^C′, R^D′, R^E′, R^F′ and R^G′ are optionally joined or fused to form a ring.

In some embodiments, the host may be selected from the HOST Group 2 consisting of:

and combinations thereof.

In some embodiments, the organic layer may further comprise a host, wherein the host comprises a metal complex.

In some embodiments, the emissive layer can comprise two hosts, a first host and a second host. In some embodiments, the first host is a hole transporting host, and the second host is an electron transporting host. In some embodiments, the first host and the second host can form an exciplex.

In some embodiments, the compound as described herein may be a sensitizer; wherein the device may further comprise an acceptor; and wherein the acceptor may be selected from the group consisting of fluorescent emitter, delayed fluorescence emitter, and combination thereof.

In yet another aspect, the OLED of the present disclosure may also comprise an emissive region containing a compound as disclosed in the above compounds section of the present disclosure.

In some embodiments, the emissive region can comprise a compound having a formula of Ir(L_AA)_x(L_BB)_y(L_CC)_z or a compound comprising a first ligand L_A having a structure of Formula I as described herein.

In some embodiments, at least one of the anode, the cathode, or a new layer disposed over the organic emissive layer functions as an enhancement layer. The enhancement layer comprises a plasmonic material exhibiting surface plasmon resonance that non-radiatively couples to the emitter material and transfers excited state energy from the emitter material to non-radiative mode of surface plasmon polariton. The enhancement layer is provided no more than a threshold distance away from the organic emissive layer, wherein the emitter material has a total non-radiative decay rate constant and a total radiative decay rate constant due to the presence of the enhancement layer and the threshold distance is where the total non-radiative decay rate constant is equal to the total radiative decay rate constant. In some embodiments, the OLED further comprises an outcoupling layer. In some embodiments, the outcoupling layer is disposed over the enhancement layer on the opposite side of the organic emissive layer. In some embodiments, the outcoupling layer is disposed on opposite side of the emissive layer from the enhancement layer but still outcouples energy from the surface plasmon mode of the enhancement layer. The outcoupling layer scatters the energy from the surface plasmon polaritons. In some embodiments this energy is scattered as photons to free space. In other embodiments, the energy is scattered from the surface plasmon mode into other modes of the device such as but not limited to the organic waveguide mode, the substrate mode, or another waveguiding mode. If energy is scattered to the non-free space mode of the OLED other outcoupling schemes could be incorporated to extract that energy to free space. In some embodiments, one or more intervening layer can be disposed between the enhancement layer and the outcoupling layer. The examples for interventing layer(s) can be dielectric materials, including organic, inorganic, perovskites, oxides, and may include stacks and/or mixtures of these materials.

The enhancement layer modifies the effective properties of the medium in which the emitter material resides resulting in any or all of the following: a decreased rate of emission, a modification of emission line-shape, a change in emission intensity with angle, a change in the stability of the emitter material, a change in the efficiency of the OLED, and reduced efficiency roll-off of the OLED device. Placement of the enhancement layer on the cathode side, anode side, or on both sides results in OLED devices which take advantage of any of the above-mentioned effects. In addition to the specific functional layers mentioned herein and illustrated in the various OLED examples shown in the figures, the OLEDs according to the present disclosure may include any of the other functional layers often found in OLEDs.

The enhancement layer can be comprised of plasmonic materials, optically active metamaterials, or hyperbolic metamaterials. As used herein, a plasmonic material is a material in which the real part of the dielectric constant crosses zero in the visible or ultraviolet region of the electromagnetic spectrum. In some embodiments, the plasmonic material includes at least one metal. In such embodiments the metal may include at least one of Ag, Al, Au, Ir, Pt, Ni, Cu, W, Ta, Fe, Cr, Mg, Ga, Rh, Ti, Ru, Pd, In, Bi, Ca alloys or mixtures of these materials, and stacks of these materials. In general, a metamaterial is a medium composed of different materials where the medium as a whole acts differently than the sum of its material parts. In particular, we define optically active metamaterials as materials which have both negative permittivity and negative permeability. Hyperbolic metamaterials, on the other hand, are anisotropic media in which the permittivity or permeability are of different sign for different spatial directions. Optically active metamaterials and hyperbolic metamaterials are strictly distinguished from many other photonic structures such as Distributed Bragg Reflectors (“DBRs”) in that the medium should appear uniform in the direction of propagation on the length scale of the wavelength of light. Using terminology that one skilled in the art can understand: the dielectric constant of the metamaterials in the direction of propagation can be described with the effective medium approximation. Plasmonic materials and metamaterials provide methods for controlling the propagation of light that can enhance OLED performance in a number of ways.

In some embodiments, the enhancement layer is provided as a planar layer. In other embodiments, the enhancement layer has wavelength-sized features that are arranged periodically, quasi-periodically, or randomly, or sub-wavelength-sized features that are arranged periodically, quasi-periodically, or randomly. In some embodiments, the wavelength-sized features and the sub-wavelength-sized features have sharp edges.

In some embodiments, the outcoupling layer has wavelength-sized features that are arranged periodically, quasi-periodically, or randomly, or sub-wavelength-sized features that are arranged periodically, quasi-periodically, or randomly. In some embodiments, the outcoupling layer may be composed of a plurality of nanoparticles and in other embodiments the outcoupling layer is composed of a plurality of nanoparticles disposed over a material. In these embodiments the outcoupling may be tunable by at least one of varying a size of the plurality of nanoparticles, varying a shape of the plurality of nanoparticles, changing a material of the plurality of nanoparticles, adjusting a thickness of the material, changing the refractive index of the material or an additional layer disposed on the plurality of nanoparticles, varying a thickness of the enhancement layer, and/or varying the material of the enhancement layer. The plurality of nanoparticles of the device may be formed from at least one of metal, dielectric material, semiconductor materials, an alloy of metal, a mixture of dielectric materials, a stack or layering of one or more materials, and/or a core of one type of material and that is coated with a shell of a different type of material. In some embodiments, the outcoupling layer is composed of at least metal nanoparticles wherein the metal is selected from the group consisting of Ag, Al, Au, Ir, Pt, Ni, Cu, W, Ta, Fe, Cr, Mg, Ga, Rh, Ti, Ru, Pd, In, Bi, Ca, alloys or mixtures of these materials, and stacks of these materials. The plurality of nanoparticles may have additional layer disposed over them. In some embodiments, the polarization of the emission can be tuned using the outcoupling layer. Varying the dimensionality and periodicity of the outcoupling layer can select a type of polarization that is preferentially outcoupled to air. In some embodiments the outcoupling layer also acts as an electrode of the device.

In yet another aspect, the present disclosure also provides a consumer product comprising an organic light-emitting device (OLED) having an anode; a cathode; and an organic layer disposed between the anode and the cathode, wherein the organic layer may comprise a compound as disclosed in the above compounds section of the present disclosure.

In some embodiments, the consumer product comprises an OLED having an anode; a cathode; and an organic layer disposed between the anode and the cathode, wherein the organic layer may comprise a compound having a formula of Ir(L_AA)_x(L_BB)_y(L_CC)_z or a compound comprising a first ligand L_A having a structure of Formula I as described herein.

In some embodiments, the consumer product can be one of a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a laser printer, a telephone, a cell phone, tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display that is less than 2 inches diagonal, a 3-D display, a virtual reality or augmented reality display, a vehicle, a video wall comprising multiple displays tiled together, a theater or stadium screen, a light therapy device, and a sign.

Generally, an OLED comprises at least one organic layer disposed between and electrically connected to an anode and a cathode. When a current is applied, the anode injects holes and the cathode injects electrons into the organic layer(s). The injected holes and electrons each migrate toward the oppositely charged electrode. When an electron and hole localize on the same molecule, an “exciton,” which is a localized electron-hole pair having an excited energy state, is formed. Light is emitted when the exciton relaxes via a photoemissive mechanism. In some cases, the exciton may be localized on an excimer or an exciplex. Non-radiative mechanisms, such as thermal relaxation, may also occur, but are generally considered undesirable.

Several OLED materials and configurations are described in U.S. Pat. Nos. 5,844,363, 6,303,238, and 5,707,745, which are incorporated herein by reference in their entirety.

The initial OLEDs used emissive molecules that emitted light from their singlet states (“fluorescence”) as disclosed, for example, in U.S. Pat. No. 4,769,292, which is incorporated by reference in its entirety. Fluorescent emission generally occurs in a time frame of less than 10 nanoseconds.

More recently, OLEDs having emissive materials that emit light from triplet states (“phosphorescence”) have been demonstrated. Baldo et al., “Highly Efficient Phosphorescent Emission from Organic Electroluminescent Devices,” Nature, vol. 395, 151-154, 1998; (“Baldo-I”) and Baldo et al., “Very high-efficiency green organic light-emitting devices based on electrophosphorescence,” Appl. Phys. Lett., vol. 75, No. 3, 4-6 (1999) (“Baldo-II”), are incorporated by reference in their entireties. Phosphorescence is described in more detail in U.S. Pat. No. 7,279,704 at cols. 5-6, which are incorporated by reference.

FIG. 1 shows an organic light emitting device 100. The figures are not necessarily drawn to scale. Device 100 may include a substrate 110, an anode 115, a hole injection layer 120, a hole transport layer 125, an electron blocking layer 130, an emissive layer 135, a hole blocking layer 140, an electron transport layer 145, an electron injection layer 150, a protective layer 155, a cathode 160, and a barrier layer 170. Cathode 160 is a compound cathode having a first conductive layer 162 and a second conductive layer 164. Device 100 may be fabricated by depositing the layers described, in order. The properties and functions of these various layers, as well as example materials, are described in more detail in U.S. Pat. No. 7,279,704 at cols. 6-10, which are incorporated by reference.

More examples for each of these layers are available. For example, a flexible and transparent substrate-anode combination is disclosed in U.S. Pat. No. 5,844,363, which is incorporated by reference in its entirety. An example of a p-doped hole transport layer is m-MTDATA doped with F₄-TCNQ at a molar ratio of 50:1, as disclosed in U.S. Patent Application Publication No. 2003/0230980, which is incorporated by reference in its entirety. Examples of emissive and host materials are disclosed in U.S. Pat. No. 6,303,238 to Thompson et al., which is incorporated by reference in its entirety. An example of an n-doped electron transport layer is BPhen doped with Li at a molar ratio of 1:1, as disclosed in U.S. Patent Application Publication No. 2003/0230980, which is incorporated by reference in its entirety. U.S. Pat. Nos. 5,703,436 and 5,707,745, which are incorporated by reference in their entireties, disclose examples of cathodes including compound cathodes having a thin layer of metal such as Mg:Ag with an overlying transparent, electrically-conductive, sputter-deposited ITO layer. The theory and use of blocking layers is described in more detail in U.S. Pat. No. 6,097,147 and U.S. Patent Application Publication No. 2003/0230980, which are incorporated by reference in their entireties. Examples of injection layers are provided in U.S. Patent Application Publication No. 2004/0174116, which is incorporated by reference in its entirety. A description of protective layers may be found in U.S. Patent Application Publication No. 2004/0174116, which is incorporated by reference in its entirety.

FIG. 2 shows an inverted OLED 200. The device includes a substrate 210, a cathode 215, an emissive layer 220, a hole transport layer 225, and an anode 230. Device 200 may be fabricated by depositing the layers described, in order. Because the most common OLED configuration has a cathode disposed over the anode, and device 200 has cathode 215 disposed under anode 230, device 200 may be referred to as an “inverted” OLED. Materials similar to those described with respect to device 100 may be used in the corresponding layers of device 200. FIG. 2 provides one example of how some layers may be omitted from the structure of device 100.

The simple layered structure illustrated in FIGS. 1 and 2 is provided by way of non-limiting example, and it is understood that embodiments of the present disclosure may be used in connection with a wide variety of other structures. The specific materials and structures described are exemplary in nature, and other materials and structures may be used. Functional OLEDs may be achieved by combining the various layers described in different ways, or layers may be omitted entirely, based on design, performance, and cost factors. Other layers not specifically described may also be included. Materials other than those specifically described may be used. Although many of the examples provided herein describe various layers as comprising a single material, it is understood that combinations of materials, such as a mixture of host and dopant, or more generally a mixture, may be used. Also, the layers may have various sublayers. The names given to the various layers herein are not intended to be strictly limiting. For example, in device 200, hole transport layer 225 transports holes and injects holes into emissive layer 220, and may be described as a hole transport layer or a hole injection layer. In one embodiment, an OLED may be described as having an “organic layer” disposed between a cathode and an anode. This organic layer may comprise a single layer, or may further comprise multiple layers of different organic materials as described, for example, with respect to FIGS. 1 and 2.

Structures and materials not specifically described may also be used, such as OLEDs comprised of polymeric materials (PLEDs) such as disclosed in U.S. Pat. No. 5,247,190 to Friend et al., which is incorporated by reference in its entirety. By way of further example, OLEDs having a single organic layer may be used. OLEDs may be stacked, for example as described in U.S. Pat. No. 5,707,745 to Forrest et al, which is incorporated by reference in its entirety. The OLED structure may deviate from the simple layered structure illustrated in FIGS. 1 and 2. For example, the substrate may include an angled reflective surface to improve out-coupling, such as a mesa structure as described in U.S. Pat. No. 6,091,195 to Forrest et al., and/or a pit structure as described in U.S. Pat. No. 5,834,893 to Bulovic et al., which are incorporated by reference in their entireties.

Unless otherwise specified, any of the layers of the various embodiments may be deposited by any suitable method. For the organic layers, preferred methods include thermal evaporation, ink-jet, such as described in U.S. Pat. Nos. 6,013,982 and 6,087,196, which are incorporated by reference in their entireties, organic vapor phase deposition (OVPD), such as described in U.S. Pat. No. 6,337,102 to Forrest et al., which is incorporated by reference in its entirety, and deposition by organic vapor jet printing (OVJP, also referred to as organic vapor jet deposition (OVJD)), such as described in U.S. Pat. No. 7,431,968, which is incorporated by reference in its entirety. Other suitable deposition methods include spin coating and other solution based processes. Solution based processes are preferably carried out in nitrogen or an inert atmosphere. For the other layers, preferred methods include thermal evaporation. Preferred patterning methods include deposition through a mask, cold welding such as described in U.S. Pat. Nos. 6,294,398 and 6,468,819, which are incorporated by reference in their entireties, and patterning associated with some of the deposition methods such as ink jet and organic vapor jet printing (OVJP). Other methods may also be used. The materials to be deposited may be modified to make them compatible with a particular deposition method. For example, substituents such as alkyl and aryl groups, branched or unbranched, and preferably containing at least 3 carbons, may be used in small molecules to enhance their ability to undergo solution processing. Substituents having 20 carbons or more may be used, and 3-20 carbons are a preferred range. Materials with asymmetric structures may have better solution processability than those having symmetric structures, because asymmetric materials may have a lower tendency to recrystallize. Dendrimer substituents may be used to enhance the ability of small molecules to undergo solution processing.

Devices fabricated in accordance with embodiments of the present disclosure may further optionally comprise a barrier layer. One purpose of the barrier layer is to protect the electrodes and organic layers from damaging exposure to harmful species in the environment including moisture, vapor and/or gases, etc. The barrier layer may be deposited over, under or next to a substrate, an electrode, or over any other parts of a device including an edge. The barrier layer may comprise a single layer, or multiple layers. The barrier layer may be formed by various known chemical vapor deposition techniques and may include compositions having a single phase as well as compositions having multiple phases. Any suitable material or combination of materials may be used for the barrier layer. The barrier layer may incorporate an inorganic or an organic compound or both. The preferred barrier layer comprises a mixture of a polymeric material and a non-polymeric material as described in U.S. Pat. No. 7,968,146, PCT Pat. Application Nos. PCT/US2007/023098 and PCT/US2009/042829, which are herein incorporated by reference in their entireties. To be considered a “mixture”, the aforesaid polymeric and non-polymeric materials comprising the barrier layer should be deposited under the same reaction conditions and/or at the same time. The weight ratio of polymeric to non-polymeric material may be in the range of 95:5 to 5:95. The polymeric material and the non-polymeric material may be created from the same precursor material. In one example, the mixture of a polymeric material and a non-polymeric material consists essentially of polymeric silicon and inorganic silicon.

Devices fabricated in accordance with embodiments of the present disclosure can be incorporated into a wide variety of electronic component modules (or units) that can be incorporated into a variety of electronic products or intermediate components. Examples of such electronic products or intermediate components include display screens, lighting devices such as discrete light source devices or lighting panels, etc. that can be utilized by the end-user product manufacturers. Such electronic component modules can optionally include the driving electronics and/or power source(s). Devices fabricated in accordance with embodiments of the present disclosure can be incorporated into a wide variety of consumer products that have one or more of the electronic component modules (or units) incorporated therein. A consumer product comprising an OLED that includes the compound of the present disclosure in the organic layer in the OLED is disclosed. Such consumer products would include any kind of products that include one or more light source(s) and/or one or more of some type of visual displays. Some examples of such consumer products include flat panel displays, curved displays, computer monitors, medical monitors, televisions, billboards, lights for interior or exterior illumination and/or signaling, heads-up displays, fully or partially transparent displays, flexible displays, rollable displays, foldable displays, stretchable displays, laser printers, telephones, mobile phones, tablets, phablets, personal digital assistants (PDAs), wearable devices, laptop computers, digital cameras, camcorders, viewfinders, micro-displays (displays that are less than 2 inches diagonal), 3-D displays, virtual reality or augmented reality displays, vehicles, video walls comprising multiple displays tiled together, theater or stadium screen, a light therapy device, and a sign. Various control mechanisms may be used to control devices fabricated in accordance with the present disclosure, including passive matrix and active matrix. Many of the devices are intended for use in a temperature range comfortable to humans, such as 18 degrees C. to 30 degrees C., and more preferably at room temperature (20-25° C.), but could be used outside this temperature range, for example, from −40 degree C. to +80° C.

More details on OLEDs, and the definitions described above, can be found in U.S. Pat. No. 7,279,704, which is incorporated herein by reference in its entirety.

The materials and structures described herein may have applications in devices other than OLEDs. For example, other optoelectronic devices such as organic solar cells and organic photodetectors may employ the materials and structures. More generally, organic devices, such as organic transistors, may employ the materials and structures.

In some embodiments, the OLED has one or more characteristics selected from the group consisting of being flexible, being rollable, being foldable, being stretchable, and being curved. In some embodiments, the OLED is transparent or semi-transparent. In some embodiments, the OLED further comprises a layer comprising carbon nanotubes.

In some embodiments, the OLED further comprises a layer comprising a delayed fluorescent emitter. In some embodiments, the OLED comprises a RGB pixel arrangement or white plus color filter pixel arrangement. In some embodiments, the OLED is a mobile device, a hand held device, or a wearable device. In some embodiments, the OLED is a display panel having less than 10 inch diagonal or 50 square inch area. In some embodiments, the OLED is a display panel having at least 10 inch diagonal or 50 square inch area. In some embodiments, the OLED is a lighting panel.

In some embodiments, the compound can be an emissive dopant. In some embodiments, the compound can produce emissions via phosphorescence, fluorescence, thermally activated delayed fluorescence, i.e., TADF (also referred to as E-type delayed fluorescence; see, e.g., U.S. application Ser. No. 15/700,352, which is hereby incorporated by reference in its entirety), triplet-triplet annihilation, or combinations of these processes. In some embodiments, the emissive dopant can be a racemic mixture, or can be enriched in one enantiomer. In some embodiments, the compound can be homoleptic (each ligand is the same). In some embodiments, the compound can be heteroleptic (at least one ligand is different from others). When there are more than one ligand coordinated to a metal, the ligands can all be the same in some embodiments. In some other embodiments, at least one ligand is different from the other ligands. In some embodiments, every ligand can be different from each other. This is also true in embodiments where a ligand being coordinated to a metal can be linked with other ligands being coordinated to that metal to form a tridentate, tetradentate, pentadentate, or hexadentate ligands. Thus, where the coordinating ligands are being linked together, all of the ligands can be the same in some embodiments, and at least one of the ligands being linked can be different from the other ligand(s) in some other embodiments.

In some embodiments, the compound can be used as a phosphorescent sensitizer in an OLED where one or multiple layers in the OLED contains an acceptor in the form of one or more fluorescent and/or delayed fluorescence emitters. In some embodiments, the compound can be used as one component of an exciplex to be used as a sensitizer. As a phosphorescent sensitizer, the compound must be capable of energy transfer to the acceptor and the acceptor will emit the energy or further transfer energy to a final emitter. The acceptor concentrations can range from 0.001% to 100%. The acceptor could be in either the same layer as the phosphorescent sensitizer or in one or more different layers. In some embodiments, the acceptor is a TADF emitter. In some embodiments, the acceptor is a fluorescent emitter. In some embodiments, the emission can arise from any or all of the sensitizer, acceptor, and final emitter

According to another aspect, a formulation comprising the compound described herein is also disclosed.

The OLED disclosed herein can be incorporated into one or more of a consumer product, an electronic component module, and a lighting panel. The organic layer can be an emissive layer and the compound can be an emissive dopant in some embodiments, while the compound can be a non-emissive dopant in other embodiments.

In yet another aspect of the present disclosure, a formulation that comprises the novel compound disclosed herein is described. The formulation can include one or more components selected from the group consisting of a solvent, a host, a hole injection material, hole transport material, electron blocking material, hole blocking material, and an electron transport material, disclosed herein.

The present disclosure encompasses any chemical structure comprising the novel compound of the present disclosure, or a monovalent or polyvalent variant thereof. In other words, the inventive compound, or a monovalent or polyvalent variant thereof, can be a part of a larger chemical structure. Such chemical structure can be selected from the group consisting of a monomer, a polymer, a macromolecule, and a supramolecule (also known as supermolecule). As used herein, a “monovalent variant of a compound” refers to a moiety that is identical to the compound except that one hydrogen has been removed and replaced with a bond to the rest of the chemical structure. As used herein, a “polyvalent variant of a compound” refers to a moiety that is identical to the compound except that more than one hydrogen has been removed and replaced with a bond or bonds to the rest of the chemical structure. In the instance of a supramolecule, the inventive compound can also be incorporated into the supramolecule complex without covalent bonds.

D. Combination of the Compounds of the Present Disclosure with Other Materials

The materials described herein as useful for a particular layer in an organic light emitting device may be used in combination with a wide variety of other materials present in the device. For example, emissive dopants disclosed herein may be used in conjunction with a wide variety of hosts, transport layers, blocking layers, injection layers, electrodes and other layers that may be present. The materials described or referred to below are non-limiting examples of materials that may be useful in combination with the compounds disclosed herein, and one of skill in the art can readily consult the literature to identify other materials that may be useful in combination.

a) Conductivity Dopants:

A charge transport layer can be doped with conductivity dopants to substantially alter its density of charge carriers, which will in turn alter its conductivity. The conductivity is increased by generating charge carriers in the matrix material, and depending on the type of dopant, a change in the Fermi level of the semiconductor may also be achieved. Hole-transporting layer can be doped by p-type conductivity dopants and n-type conductivity dopants are used in the electron-transporting layer.

Non-limiting examples of the conductivity dopants that may be used in an OLED in combination with materials disclosed herein are exemplified below together with references that disclose those materials: EP01617493, EP01968131, EP2020694, EP2684932, US20050139810, US20070160905, US20090167167, US2010288362, WO06081780, WO2009003455, WO2009008277, WO2009011327, WO2014009310, US2007252140, US2015060804, US20150123047, and US2012146012.

b) HIL/HTL:

A hole injecting/transporting material to be used in the present disclosure is not particularly limited, and any compound may be used as long as the compound is typically used as a hole injecting/transporting material. Examples of the material include, but are not limited to: a phthalocyanine or porphyrin derivative; an aromatic amine derivative; an indolocarbazole derivative; a polymer containing fluorohydrocarbon; a polymer with conductivity dopants; a conducting polymer, such as PEDOT/PSS; a self-assembly monomer derived from compounds such as phosphoric acid and silane derivatives; a metal oxide derivative, such as MoO_x; a p-type semiconducting organic compound, such as 1,4,5,8,9,12-Hexaazatriphenylenehexacarbonitrile; a metal complex, and a cross-linkable compounds.

Examples of aromatic amine derivatives used in HIL or HTL include, but not limit to the following general structures:

Each of Ar¹ to Ar⁹ is selected from the group consisting of aromatic hydrocarbon cyclic compounds such as benzene, biphenyl, triphenyl, triphenylene, naphthalene, anthracene, phenalene, phenanthrene, fluorene, pyrene, chrysene, perylene, and azulene; the group consisting of aromatic heterocyclic compounds such as dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridylindole, pyrrolodipyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indoxazine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine, benzofuropyridine, furodipyridine, benzothienopyridine, thienodipyridine, benzoselenophenopyridine, and selenophenodipyridine; and the group consisting of 2 to 10 cyclic structural units which are groups of the same type or different types selected from the aromatic hydrocarbon cyclic group and the aromatic heterocyclic group and are bonded to each other directly or via at least one of oxygen atom, nitrogen atom, sulfur atom, silicon atom, phosphorus atom, boron atom, chain structural unit and the aliphatic cyclic group. Each Ar may be unsubstituted or may be substituted by a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acids, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

In one aspect, Ar¹ to Ar⁹ is independently selected from the group consisting of:

• • wherein k is an integer from 1 to 20; X¹⁰¹ to X¹⁰⁸ is C (including CH) or N; Z¹⁰¹ is NAr¹, O, or S; Ar¹ has the same group defined above.

Examples of metal complexes used in HIL or HTL include, but are not limited to the following general formula:

wherein Met is a metal, which can have an atomic weight greater than 40; (Y¹⁰¹-Y¹⁰²) is a bidentate ligand, Y¹⁰¹ and Y¹⁰² are independently selected from C, N, O, P, and S; L¹⁰¹ is an ancillary ligand; k′ is an integer value from 1 to the maximum number of ligands that may be attached to the metal; and k′+k″ is the maximum number of ligands that may be attached to the metal.

In one aspect, (Y¹⁰¹-Y¹⁰²) is a 2-phenylpyridine derivative. In another aspect, (Y¹⁰¹-Y¹⁰²) is a carbene ligand. In another aspect, Met is selected from Ir, Pt, Os, and Zn. In a further aspect, the metal complex has a smallest oxidation potential in solution vs. Fc⁺/Fc couple less than about 0.6 V.

Non-limiting examples of the HIL and HTL materials that may be used in an OLED in combination with materials disclosed herein are exemplified below together with references that disclose those materials: CN102702075, DE102012005215, EP01624500, EP01698613, EP01806334, EP01930964, EP01972613, EP01997799, EP02011790, EP02055700, EP02055701, EP1725079, EP2085382, EP2660300, EP650955, JP07-073529, JP2005112765, JP2007091719, JP2008021687, JP2014-009196, KR20110088898, KR20130077473, TW201139402, U.S. Ser. No. 06/517,957, US20020158242, US20030162053, US20050123751, US20060182993, US20060240279, US20070145888, US20070181874, US20070278938, US20080014464, US20080091025, US20080106190, US20080124572, US20080145707, US20080220265, US20080233434, US20080303417, US2008107919, US20090115320, US20090167161, US2009066235, US2011007385, US20110163302, US2011240968, US2011278551, US2012205642, US2013241401, US20140117329, US2014183517, U.S. Pat. Nos. 5,061,569, 5,639,914, WO05075451, WO07125714, WO08023550, WO08023759, WO2009145016, WO2010061824, WO2011075644, WO2012177006, WO2013018530, WO2013039073, WO2013087142, WO2013118812, WO2013120577, WO2013157367, WO2013175747, WO2014002873, WO2014015935, WO2014015937, WO2014030872, WO2014030921, WO2014034791, WO2014104514, WO2014157018.

c) EBL:

An electron blocking layer (EBL) may be used to reduce the number of electrons and/or excitons that leave the emissive layer. The presence of such a blocking layer in a device may result in substantially higher efficiencies, and/or longer lifetime, as compared to a similar device lacking a blocking layer. Also, a blocking layer may be used to confine emission to a desired region of an OLED. In some embodiments, the EBL material has a higher LUMO (closer to the vacuum level) and/or higher triplet energy than the emitter closest to the EBL interface. In some embodiments, the EBL material has a higher LUMO (closer to the vacuum level) and/or higher triplet energy than one or more of the hosts closest to the EBL interface. In one aspect, the compound used in EBL contains the same molecule or the same functional groups used as one of the hosts described below.

d) Hosts:

The light emitting layer of the organic EL device of the present disclosure preferably contains at least a metal complex as light emitting material, and may contain a host material using the metal complex as a dopant material. Examples of the host material are not particularly limited, and any metal complexes or organic compounds may be used as long as the triplet energy of the host is larger than that of the dopant. Any host material may be used with any dopant so long as the triplet criteria is satisfied.

Examples of metal complexes used as host are preferred to have the following general formula:

wherein Met is a metal; (Y¹⁰³-Y¹⁰⁴) is a bidentate ligand, Y¹⁰³ and Y¹⁰⁴ are independently selected from C, N, O, P, and S; L¹⁰¹ is an another ligand; k′ is an integer value from 1 to the maximum number of ligands that may be attached to the metal; and k′+k″ is the maximum number of ligands that may be attached to the metal.

In one aspect, the metal complexes are:

wherein (O—N) is a bidentate ligand, having metal coordinated to atoms O and N.

In another aspect, Met is selected from Ir and Pt. In a further aspect, (Y¹⁰³-Y¹⁰⁴) is a carbene ligand.

In one aspect, the host compound contains at least one of the following groups selected from the group consisting of aromatic hydrocarbon cyclic compounds such as benzene, biphenyl, triphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenalene, phenanthrene, fluorene, pyrene, chrysene, perylene, and azulene; the group consisting of aromatic heterocyclic compounds such as dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridylindole, pyrrolodipyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indoxazine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine, benzofuropyridine, furodipyridine, benzothienopyridine, thienodipyridine, benzoselenophenopyridine, and selenophenodipyridine; and the group consisting of 2 to 10 cyclic structural units which are groups of the same type or different types selected from the aromatic hydrocarbon cyclic group and the aromatic heterocyclic group and are bonded to each other directly or via at least one of oxygen atom, nitrogen atom, sulfur atom, silicon atom, phosphorus atom, boron atom, chain structural unit and the aliphatic cyclic group. Each option within each group may be unsubstituted or may be substituted by a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acids, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

In one aspect, the host compound contains at least one of the following groups in the molecule:

wherein R¹⁰¹ is selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acids, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof, and when it is aryl or heteroaryl, it has the similar definition as Ar's mentioned above. k is an integer from 0 to 20 or 1 to 20. X¹⁰¹ to X¹⁰⁸ are independently selected from C (including CH) or N. Z¹⁰¹ and Z¹⁰² are independently selected from NR¹⁰¹, O, or S.

Non-limiting examples of the host materials that may be used in an OLED in combination with materials disclosed herein are exemplified below together with references that disclose those materials: EP2034538, EP2034538A, EP2757608, JP2007254297, KR20100079458, KR20120088644, KR20120129733, KR20130115564, TW201329200, US20030175553, US20050238919, US20060280965, US20090017330, US20090030202, US20090167162, US20090302743, US20090309488, US20100012931, US20100084966, US20100187984, US2010187984, US2012075273, US2012126221, US2013009543, US2013105787, US2013175519, US2014001446, US20140183503, US20140225088, US2014034914, U.S. Pat. No. 7,154,114, WO2001039234, WO2004093207, WO2005014551, WO2005089025, WO2006072002, WO2006114966, WO2007063754, WO2008056746, WO2009003898, WO2009021126, WO2009063833, WO2009066778, WO2009066779, WO2009086028, WO2010056066, WO2010107244, WO2011081423, WO2011081431, WO2011086863, WO2012128298, WO2012133644, WO2012133649, WO2013024872, WO2013035275, WO2013081315, WO2013191404, WO2014142472, US20170263869, US20160163995, U.S. Pat. No. 9,466,803,

e) Additional Emitters:

One or more additional emitter dopants may be used in conjunction with the compound of the present disclosure. Examples of the additional emitter dopants are not particularly limited, and any compounds may be used as long as the compounds are typically used as emitter materials. Examples of suitable emitter materials include, but are not limited to, compounds which can produce emissions via phosphorescence, fluorescence, thermally activated delayed fluorescence, i.e., TADF (also referred to as E-type delayed fluorescence), triplet-triplet annihilation, or combinations of these processes.

Non-limiting examples of the emitter materials that may be used in an OLED in combination with materials disclosed herein are exemplified below together with references that disclose those materials: CN103694277, CN1696137, EB01238981, EP01239526, EP01961743, EP1239526, EP1244155, EP1642951, EP1647554, EP1841834, EP1841834B, EP2062907, EP2730583, JP2012074444, JP2013110263, JP4478555, KR1020090133652, KR20120032054, KR20130043460, TW201332980, U.S. Ser. No. 06/699,599, U.S. Ser. No. 06/916,554, US20010019782, US20020034656, US20030068526, US20030072964, US20030138657, US20050123788, US20050244673, US2005123791, US2005260449, US20060008670, US20060065890, US20060127696, US20060134459, US20060134462, US20060202194, US20060251923, US20070034863, US20070087321, US20070103060, US20070111026, US20070190359, US20070231600, US2007034863, US2007104979, US2007104980, US2007138437, US2007224450, US2007278936, US20080020237, US20080233410, US20080261076, US20080297033, US200805851, US2008161567, US2008210930, US20090039776, US20090108737, US20090115322, US20090179555, US2009085476, US2009104472, US20100090591, US20100148663, US20100244004, US20100295032, US2010102716, US2010105902, US2010244004, US2010270916, US20110057559, US20110108822, US20110204333, US2011215710, US2011227049, US2011285275, US2012292601, US20130146848, US2013033172, US2013165653, US2013181190, US2013334521, US20140246656, US2014103305, U.S. Pat. Nos. 6,303,238, 6,413,656, 6,653,654, 6,670,645, 6,687,266, 6,835,469, 6,921,915, 7,279,704, 7,332,232, 7,378,162, 7,534,505, 7,675,228, 7,728,137, 7,740,957, 7,759,489, 7,951,947, 8,067,099, 8,592,586, 8,871,361, WO06081973, WO06121811, WO07018067, WO07108362, WO07115970, WO07115981, WO08035571, WO2002015645, WO2003040257, WO2005019373, WO2006056418, WO2008054584, WO2008078800, WO2008096609, WO2008101842, WO2009000673, WO2009050281, WO2009100991, WO2010028151, WO2010054731, WO2010086089, WO2010118029, WO2011044988, WO2011051404, WO2011107491, WO2012020327, WO2012163471, WO2013094620, WO2013107487, WO2013174471, WO2014007565, WO2014008982, WO2014023377, WO2014024131, WO2014031977, WO2014038456, WO2014112450.

f) HBL:

A hole blocking layer (HBL) may be used to reduce the number of holes and/or excitons that leave the emissive layer. The presence of such a blocking layer in a device may result in substantially higher efficiencies and/or longer lifetime as compared to a similar device lacking a blocking layer. Also, a blocking layer may be used to confine emission to a desired region of an OLED. In some embodiments, the HBL material has a lower HOMO (further from the vacuum level) and/or higher triplet energy than the emitter closest to the HBL interface. In some embodiments, the HBL material has a lower HOMO (further from the vacuum level) and/or higher triplet energy than one or more of the hosts closest to the HBL interface.

In one aspect, compound used in HBL contains the same molecule or the same functional groups used as host described above.

In another aspect, compound used in HBL contains at least one of the following groups in the molecule:

wherein k is an integer from 1 to 20; L¹⁰¹ is another ligand, k′ is an integer from 1 to 3.

g) ETL:

Electron transport layer (ETL) may include a material capable of transporting electrons. Electron transport layer may be intrinsic (undoped), or doped. Doping may be used to enhance conductivity. Examples of the ETL material are not particularly limited, and any metal complexes or organic compounds may be used as long as they are typically used to transport electrons.

In one aspect, compound used in ETL contains at least one of the following groups in the molecule:

wherein R¹⁰¹ is selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acids, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof, when it is aryl or heteroaryl, it has the similar definition as Ar's mentioned above. Ar¹ to Ar³ has the similar definition as Ar's mentioned above. k is an integer from 1 to 20. X¹⁰¹ to X¹⁰⁸ is selected from C (including CH) or N.

In another aspect, the metal complexes used in ETL contains, but not limit to the following general formula:

wherein (O—N) or (N—N) is a bidentate ligand, having metal coordinated to atoms O, N or N, N; L¹⁰¹ is another ligand; k′ is an integer value from 1 to the maximum number of ligands that may be attached to the metal.

Non-limiting examples of the ETL materials that may be used in an OLED in combination with materials disclosed herein are exemplified below together with references that disclose those materials: CN103508940, EP01602648, EP01734038, EP01956007, JP2004-022334, JP2005149918, JP2005-268199, KR0117693, KR20130108183, US20040036077, US20070104977, US2007018155, US20090101870, US20090115316, US20090140637, US20090179554, US2009218940, US2010108990, US2011156017, US2011210320, US2012193612, US2012214993, US2014014925, US2014014927, US20140284580, U.S. Pat. Nos. 6,656,612, 8,415,031, WO2003060956, WO2007111263, WO2009148269, WO2010067894, WO2010072300, WO2011074770, WO2011105373, WO2013079217, WO2013145667, WO2013180376, WO2014104499, WO2014104535,

h) Charge Generation Layer (CGL)

In tandem or stacked OLEDs, the CGL plays an essential role in the performance, which is composed of an n-doped layer and a p-doped layer for injection of electrons and holes, respectively. Electrons and holes are supplied from the CGL and electrodes. The consumed electrons and holes in the CGL are refilled by the electrons and holes injected from the cathode and anode, respectively; then, the bipolar currents reach a steady state gradually. Typical CGL materials include n and p conductivity dopants used in the transport layers.

In any above-mentioned compounds used in each layer of the OLED device, the hydrogen atoms can be partially or fully deuterated. The minimum amount of hydrogen of the compound being deuterated is selected from the group consisting of 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99%, and 100%. Thus, any specifically listed substituent, such as, without limitation, methyl, phenyl, pyridyl, etc. may be undeuterated, partially deuterated, and fully deuterated versions thereof. Similarly, classes of substituents such as, without limitation, alkyl, aryl, cycloalkyl, heteroaryl, etc. also may be undeuterated, partially deuterated, and fully deuterated versions thereof.

It is understood that the various embodiments described herein are by way of example only and are not intended to limit the scope of the invention. For example, many of the materials and structures described herein may be substituted with other materials and structures without deviating from the spirit of the invention. The present invention as claimed may therefore include variations from the particular examples and preferred embodiments described herein, as will be apparent to one of skill in the art. It is understood that various theories as to why the invention works are not intended to be limiting.

E. Experimental Data

Synthesis of Materials

Synthesis of 4′-chloro-2′-fluoro-2-hydroxy-[1,1′-biphenyl]-3-carbaldehyde

A mixture of (4-chloro-2-fluorophenyl)boronic acid (19.43 g, 111 mmol), 3-bromo-2-hydroxy benzaldehyde (16 g, 80 mmol), palladium acetate (0.536 g, 2.388 mmol) and SPhos (1.958 g, 4.78 mmol) was suspended in Toluene (640 ml) and Water (128 ml), and then potassium phosphate (50.7 g, 239 mmol) was added under N₂. The reaction mixture was then heated to 95° C. for 3 hours. After cooling down, ethyl acetate (200 mL) and water (100 mL) were added with stirring. Organic layer was collected, and aqueous layer was extracted with ethyl acetate (100 mL). All solvents were removed, and the residue was used for next step without further purification.

Synthesis of 7-chlorodibenzo[b,d]furan-4-carbaldehyde

To a solution of 4′-chloro-2′-fluoro-2-hydroxy[1,1′-biphenyl]-3-carbaldehyde (33 g, 132 mmol) in DMF (200 ml), was added K₂CO₃ (54.6 g, 395 mmol). The reaction mixture was then heated to 70° C. for 20 hours. After cooling down, the suspension was filtrated, and washed with ethyl acetate (150 mL). Then the solution was washed with aqueous HCl (0.5 M, 100 mL). Organic layer was collected, and the solvent was removed. The residue was purified by flash chromatography, using heptanes:ethyl acetate, from 100:0 to 85:15 to give 17 g of product.

Synthesis of 4-bromo-2,6-diisopropyl-N-(2-nitrophenyl)aniline

A solution of 4-bromo-2,6-diisopropylaniline (15 g, 58.6 mmol), 1-bromo-2-nitrobenzene (13.01 g, 64.4 mmol), dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine (1.923 g, 4.68 mmol), Pd₂(dba)₃ (1.072 g, 1.171 mmol), Cs₂CO₃ (38.2 g, 117 mmol) in Toluene (195 ml) was degassed with N₂/vacuum cycle three times. The reaction mixture was stirred at 100° C. for 48 h. The crude mixture was cooled and filtered with DCM. The residue was purified by flash chromatography using 5 to 7% ethyl acetate/heptane to receive the desired compound as a yellow solid.

Synthesis of N-(4-bromo-2,6-diisopropylphenyl)benzene-1,2-diamine

To a solution of 4-bromo-2,6-diisopropyl-N-(2-nitrophenyl)aniline (5.4 g, 14.31 mmol) in ethanol (100 ml) was added ammonium chloride (2.71 g, 50.1 mmol), water (50 ml), and iron (4.00 g, 71.6 mmol). The reaction was heated in an oil bath set at 90° C. The reaction mixture was filtered and washed through using EtOAc. The filtrate was extracted with EtOAc and washed with brine, and the organic layer was dried with sodium sulfate, filtered, and concentrated down to a purple oil. The crude product was purified using 75/25/5 to 60/30/10 heptane/DCM/THF to get 5.05 g of the desired compound as a purple oil.

Synthesis of 5. 2-(7-chlorodibenzo[b,d]furan-4-yl)-1-(3,5-diisopropyl-[1,1′-biphenyl]-4-yl)-1H-benzo[d]imidazole

To a solution of N1-(3,5-diisopropyl[1,1′-biphenyl]-4-yl)benzene-1,2-diamine (18.0 g, 47.5 mmol) and 7-chlorodibenzo[b,d]furan-4-carbaldehyde (10.2 g, 43.3 mmol) in DMF (300 mL) was added sodium bisulfite (45.0 g, 432 mmol). The reaction mixture was heated at 120° C. for 90 h, cooled to room temperature and diluted with water (500 mL). The solid was collected by filtration and washed with water (200 mL). The solid was washed with DCM (200 mL) and THF (100 mL) and the remaining light orange solid was dissolved in DCM and purified by flash chromatography (0-100% THF/isohexane) to provide 2-(7-chlorodibenzo[b,d]furan-4-yl)-1-(3,5-diisopropyl-[1,1′-biphenyl]-4-yl)-1H-benzo[d]imidazole (11.5 g, 20.63 mmol, 44% yield) as a light brown solid.

Synthesis of 1-(3,5-diisopropyl-[1,1′-biphenyl]-4-yl)-2-(7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)dibenzo[b,d]furan-4-yl)-1H-benzo[d]imidazole

A 250 mL 4-neck round bottom flask, equipped with a thermocouple, stir bar and condenser was charged with 2-(7-chlorodibenzo[b,d]furan-4-yl)-1-(3,5-diiso-propyl-[1,1′-biphenyl]-4-yl)-1H-benzo[d]imidazole (8.00 g, 14.41 mmol, 1.0 equiv), bis(pinacolato)diboron (5.49 g, 21.6 mmol, 1.5 equiv), potassium pivalate (5.05 g, 36.03 mmol, 2.5 equiv), 2-(dicyclohexylphosphanyl)-2′, 4′, 6′-tris(isopropyl)biphenyl (XPhos) (0.41 g, 0.86 mmol, 0.06 equiv) and 1,4-dioxane (72 mL). The reaction mixture was sparged with nitrogen for 10 minutes. Tris(dibenzylideneacetone)dipalladium(O) (0.40 g, 0.43 mmol, 0.03 equiv) was added then the reaction mixture heated at 85° C. for 4 hours. After cooling to room temperature, the reaction mixture was filtered through a pad of Celite® (50 g), rinsing with ethyl acetate (600 mL). The filtrate was concentrated under reduced pressure. The crude product was purified by silica gel chromatography, eluting with a gradient of 0 to 30% ethyl acetate in hexanes to give 1-(3,5-diisopropyl-[1,1′-bi-phenyl]-4-yl)-2-(7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)dibenzo[b,d]furan-4-yl)-1H-benzo[d]imidazole (7.50 g, 80% yield) as a white amorphous solid.

Synthesis of 2-(7-(4,-di-tert-butyl-1,3,5-triazin-2-yl)dibenzo[b,d]furan-4-yl)-1-(3,5-diisopropyl-[1,1′-biphenyl]-4-yl)-1H-benzo[d]imidazole

A 250 mL 4-neck round bottom flask, equipped with a thermocouple, stir bar and condenser was charged with 1-(3,5-diisopropyl-[1,1′-biphenyl]-4-yl)-2-(7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)dibenzo[b,d]furan-4-yl)-1H-benzo[d]imidazole (5.00 g, 7.73 mmol, 1.0 equiv), 2,4-di-tert-butyl-6-chloro-1,3,5-triazine (1.94 g, 8.51 mmol, 1.1 equiv), potassium carbonate (2.67 g, 19.33 mmol, 2.5 equiv), 1,4-dioxane (58 mL) and water (20 mL). The reaction mixture was sparged with nitrogen for 10 minutes. Tetrakis(triphenylphosphine)palladium(O) (0.45 g, 0.39 mmol, 0.05 equiv) was added then the reaction mixture heated overnight at 85° C. After cooling to room temperature, the reaction mixture was poured into ethyl acetate (500 mL) and the layers separated. The organic layer was washed with saturated brine (100 mL), dried over sodium sulfate and concentrated under reduced pressure. The crude product was purified by silica gel chromatography, eluting with a gradient of 0 to 15% ethyl acetate in hexanes to give 2-(7-(4,6-di-tert-butyl-1,3,5-triazin-2-yl)dibenzo[b,d]furan-4-yl)-1-(3,5-diisopropyl-[1,1′-biphenyl]-4-yl)-1H-benzo[d]imidazole (4.63 g, 84% yield) as a white solid.

Synthesis of 2-(4-fluorophenyl)-4,5-bis(methyl-d3)pyridine (F-ppy)

To a solution of 2-bromo-4,5-bis(methyl-d3)pyridine (8.0 g, 41.6 mmol) and (4-fluorophenyl)(14-oxidaneylidene)borane (6.45 g, 52.1 mmol) in DME (210 ml) was added potassium carbonate (11.51 g, 83 mmol) and Water (70.0 ml). The reaction was purged with nitrogen for 15 min then Pd(PPh₃)₄ (1.93 g, 1.67 mmol) was added. The reaction was heated in an oil bath set at 95° C. for 36 hours under nitrogen. The reaction mixture was extracted with EtOAc, then the organic phase was washed with brine 2×, dried with sodium sulfate, filtered and concentrated down to a purple solid. The purple solid was purified by column chromatography, eluting with 50/47.5/2.5 to 50/40/10 DCM/heptane/EtOAc to afford 6.8 g of white solid as the desired product.

Synthesis of [(F-ppy)₂IrCl]₂

A 500 mL 4-neck flask was charged with iridium(III) chloride hydrate (20.1 g, 63.5 mmol, 1.0 equiv), 2-ethoxyethanol (280 mL) and DI water (93 mL). The reaction mixture was sparged with nitrogen for 10 minutes. 2-(4-Fluorophenyl)-4,5-bis(methyl-d₃)pyridine (29.0 g, 140 mmol, 2.2 equiv) was added and sparging continued for 10 additional minutes. After heating at 102° C. for 2 days, the reaction was cooled to room temperature and the resulting suspension was filtered. The solid was rinsed with methanol (100 mL) then dried under vacuum overnight at 50° C. to give [(F-ppy)₂IrCl]₂ (39.0 g, 96% yield) as a yellow solid.

Synthesis of solvento-[(F-ppy)₂Ir]OTf

A 1 L single neck flask was charged with di-μ-chloro-tetrakis[κ2(C2,N)-2-(4-fluorophenyl-2′-yl)-4,5-bis-(methyl-d₃)pyridin-1-yl]diiridium(III) (26.5 g, 20.7 mmol, 1.0 equiv) and dichloromethane (345 mL). A solution of silver trifluoromethane-sulfonate (11.2 g, 43.5 mmol, 2.1 equiv) in methanol (69 mL) was added and the flask wrapped in foil to exclude light. The reaction mixture was stirred overnight at room temperature. The reaction mixture was filtered through silica gel (200 g) topped with Celite® (40 g), rinsing with dichloromethane (2 L). The filtrate was concentrated under reduced pressure and the residue dried under vacuum for 2 hours at 50° C. to give solvento-[(F-ppy)₂Ir]OTf (22.1 g, 65% yield) as a yellow solid.

Synthesis of the Inventive Example

A 250 mL 4-neck round bottom flask, equipped with a thermocouple, condenser and stir bar, was charged with [(Ir(2-((4-fluorophenyl-2′-yl)-4,5-bis(methyl-d₃)-pyridin-1-yl(-1H))₂ (MeOH)₂]trifluoromethanesulfonate (4.00 g, 4.89 mmol, 1.0 equiv), 2-(7-(4,6-di-tert-butyl-1,3,5-triazin-2-yDdibenzo[b,d]-furan-4-yl)-1-(3,5-diisopropyl-[1,1′-biphenyl]-4-yl)-1H-benzo[d]imidazole (3.48 g, 4.89 mmol, 1.0 equiv), 2,6-lutidine (0.57 mL, 4.89 mmol, 1.0 equiv) and diglyme (60 mL). After heating at 125° C. for 4 hours, the reaction was cooled to room temperature and concentrated under reduced pressure. The residue was triturated with dichloromethane (30 mL), filtered and the solid washed with methanol (3×20 mL). A solution of the solid (˜3.1 g) in dichloromethane (200 mL) was filtered through a pad of silica gel (50 g) topped with a pad of basic alumina (100 g), eluting with dichloromethane (1.0 L). The filtrate was concentrated under reduced pressure. The residue was dissolved in dichloromethane (130 mL, 52 volumes) and precipitated with methanol (260 mL, 100 volumes). The suspension was stirred for 30 minutes, filtered and the solid washed with methanol (3×20 mL). The solid was dried under vacuum overnight at 50° C. to give the Inventive Example (1.34 g, 21% yield) as a yellow solid. Based on DFT data, this compound has 16.7% ³MLCT and 66.7% ³LC contributions, while the comparative compound shown below has 15.8% ³MLCT and 58.9% ³LC contributions.

All device examples were fabricated by high vacuum (<10⁻⁷ Torr) thermal evaporation (VTE). The anode electrode was 800 Å of indium tin oxide (ITO). The cathode consisted of 10 Å of LiF followed by 1000 Å of A1. All devices were encapsulated with a glass lid sealed with an epoxy resin in a nitrogen glove box (<1 ppm of H₂O and O₂) immediately after fabrication, and a moisture getter was incorporated inside the package.

The organic stack of the device examples consisted of sequentially, from the ITO surface, 100 Å of HATCN as the hole injection layer (HIL), 400 Å of hole transport material HTM as the hole transport layer (HTL), 50 Å of EBL as an electron blocking layer (EBL), 400 Å of H1 doped with 40 wt % H2 and 5 wt % emitter as the emissive layer (EML), 50 Å of H2 as a blocking layer (BL), and 300 Å of 35% ETM in Liq (8-quinolinolato lithium) as the electron transport layer (ETL). As used herein, HATCN, HTM, EBL, H1, H2, and ETM have the following structures:

Upon fabrication, the device was tested to measure EL and JVL. For this purpose, the samples were energized by the 2 channel Keysight B2902A SMU at a current density of 10 mA/cm² and measured by the Photo Research PR735 Spectroradiometer. Radiance (W/str/cm²) from 380 nm to 1080 nm, and total integrated photon count were collected. The devices were then placed under a large area silicon photodiode for the JVL sweep. The integrated photon count of the device at 10 mA/cm² is used to convert the photodiode current to photon count. The voltage is swept from 0 to a voltage equating to 200 mA/cm². The EQE of the device is calculated using the total integrated photon count. All results are summarized in Table 1. Voltage, LE, EQE, PE, and LT₉₇% of inventive example (Device 1) are reported as relative numbers normalized to the results of the comparative example (Device 2).

TABLE 1
Inventive and Comparative Example device data, as measured at a
current density of 10 mA/cm2.
	Peak WL	FWHM	Voltage	EQE
Emitter	(nm)	(nm)	(relative)	(relative)
Inventive Example	531	27	1.00	1.00
Comparative	525	58	1.00	1.00
Example

As shown by the device results in Table 1, the inventive examples exhibited markedly narrower lineshape (27 nm FWHM) while maintaining comparable performance otherwise. In general, the FWHM for a phosphorescent emitter complex is broad. It has been a long-sought goal to achieve the narrow FWHM. The narrower FWHM, the better color purity for the display application. As a background information, the ideal line shape is a single wavelength (single line). This improvement was beyond any value that could be attributed to experimental error and the observed improvement is significant and unexpected.

Claims

1. A compound comprising a first ligand LA having a structure of Formula I,

2. The compound of claim 1, wherein each Rα, Rβ, R, R′, R″, R1, R2, and R3 is independently hydrogen or a substituent selected from the group consisting of deuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, sulfanyl, and combinations thereof.

3. The compound of claim 1, wherein the compound has a formula Ir(LAA)x(LBB)y(LCC)z; wherein x, y, z are each independently 0 or 1 or 2;wherein x+y+z=3;wherein LAA has Formula IIIA:

4. The compound of claim 3, wherein the silyl group is selected from the group consisting of the following structures: SiMe3, SiEt3, Si(iPr)3, Si(tBu)3, SiPh3, Si(CD3)3,

5. The compound of claim 3, wherein the silyl group is selected from the group consisting of

6. The compound of claim 3, wherein the germyl group is selected from the group consisting of GeMe3, GeEt3, Ge(iPr)3, Ge(tBu)3, GePh3, Ge(CD3)3,

7. The compound of claim 3, wherein ligand LAA is selected from the group consisting of:

8. The compound of claim 3, wherein ligand LAA is selected from the group consisting of:

9. The compound of claim 3, wherein ligand LAA is selected from LAAn(RJ)(RK)(RL)(RM), wherein n is an integer from 1 to 28, and each LAAn(RJ)(RK)(RL)(RM) is defined below:

10. The compound of claim 3, wherein ring D′ is imidazole, pyrazole, pyrrole, oxazole, furan, triazole, thiophene, or thiazole.

11. The compound of claim 3, wherein ligand LBB is selected from the group consisting of:

12. The compound of claim 3, wherein ligand LBB is selected from the group consisting of:

13. The compound of claim 3, wherein ligand LBB is selected from LBBw-(RG)(RH)(RI)(QJ), wherein w is an integer from 1 to 21, and each LBBw-(RG)(RH)(RI)(QJ) is defined as follows:

14. The compound of claim 3, wherein the compound has a formula Ir(LAA)2(LBB), or Ir(LAA)(LBB)2.

15. The compound of claim 3, wherein the compound is selected from the group consisting of:

16. The compound of claim 11, wherein the compound has the Formula II:

17. An organic light emitting device (OLED) comprising: an anode;a cathode; andan organic layer disposed between the anode and the cathode, wherein the organic layer comprises a compound according to claim 1.

18. The OLED of claim 17, wherein the organic layer further comprises a host, wherein the host comprises at least one chemical moiety selected from the group consisting of triphenylene, carbazole, indolocarbazole, dibenzothiophene, dibenzofuran, dibenzoselenophene, 5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene, triazine, boryl, silyl, aza-triphenylene, aza-carbazole, aza-indolocarbazole, aza-dibenzothiophene, aza-dibenzofuran, aza-dibenzoselenophene, aza-5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, and aza-(5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene).

19. The OLED of claim 17, wherein the organic layer further comprises a host, wherein the host is selected from the group consisting of the HOST Group 1 defined herein.

20. A consumer product comprising an organic light-emitting device comprising: an anode;a cathode; andan organic layer disposed between the anode and the cathode, wherein the organic layer comprises a compound according to claim 1.