Patent Grant
12331237
The present disclosure generally relates to organometallic compounds and formulations and their various uses including as emitters in devices such as organic light emitting diodes and related electronic devices.
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.
In one aspect, the present disclosure provides a compound comprising a first ligand LA of Formula I
In Formula I:
where:
In another aspect, the present disclosure provides a formulation of the compound of the present disclosure.
In yet another aspect, the present disclosure provides an OLED having an organic layer comprising the compound of the present disclosure.
In yet another aspect, the present disclosure provides a consumer product comprising an OLED with an organic layer comprising the compound of the present disclosure.
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)—Rs).
The term “ester” refers to a substituted oxycarbonyl (—O—C(O)—Rs or —C(O)—O—Rs) radical.
The term “ether” refers to an —ORs radical.
The terms “sulfanyl” or “thio-ether” are used interchangeably and refer to a —SRs radical.
The term “sulfinyl” refers to a —S(O)—Rs radical.
The term “sulfonyl” refers to a —SO2—Rs radical.
The term “phosphino” refers to a —P(Rs)3 radical, wherein each Rs can be same or different.
The term “silyl” refers to a —Si(Rs)3 radical, wherein each Rs can be same or different.
The term “boryl” refers to a —B(Rs)2 radical or its Lewis adduct —B(Rs)3 radical, wherein Rs can be same or different.
In each of the above, Rs 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 Rs 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, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, boryl, 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, alkenyl, cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile, sulfanyl, boryl, 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, boryl, 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[fh]quinoxaline and dibenzo[fh]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.
In one aspect, the present disclosure provides a compound comprising a first ligand LA of Formula I
In Formula I:
where:
In some embodiments, each RA, RB, and RC is independently a hydrogen or a substituent selected from the group consisting of the preferred general substituents disclosed herein, and combinations thereof. In some embodiments, each RA, RB, and RC is independently a hydrogen or a substituent selected from the group consisting of the more preferred general substituents disclosed herein, and combinations thereof.
In some embodiments, M is Ir. In some embodiments, M is Pt.
In some embodiments, X1 and X2 are N, and X3 is C. In some embodiments, X1 is N, and X2 and X3 are C. In some embodiments, X1 and X3 are N, and X2 is C. In some embodiments, X1 and X3 are C, and X2 is N.
In some embodiments, R is a substituted or unsubstituted 6-membered aryl or heteroaryl ring. In some embodiments, R is a substituted or unsubstituted 5-membered heteroaryl ring.
In some embodiments, R is a substituted or unsubstituted cyclohexyl ring. In some embodiments, R is a substituted or unsubstituted cyclopentyl ring. In some embodiments, R is selected from the group consisting of imidazole, oxazole, thiazole, pyridine, phenyl, biphenyl, carbazole, benzofuran, benzothiophene, dibenzofuran, and dibenzothiophene.
In some embodiments, R is two or more fused 5-membered or 6-membered carbocyclic or heterocyclic rings, which can be further fused or substituted. In some embodiments, R is two or more unfused 5-membered or 6-membered carbocyclic or heterocyclic rings, which can be further substituted. In some embodiments, R is two or more fused 5-membered or 6-membered aryl or heteroaryl rings, which can be further fused or substituted. In some embodiments, R is two or more unfused 5-membered or 6-membered aryl or heteroaryl rings, which can be further substituted.
In some embodiments, Ring B has the structure of Formula II, and each of Q1, Q2, Q3, Q4, Q5, and Q6 is C. In some embodiments, Ring B has the structure of Formula II, and at least one of Q1, Q2, Q3, Q4, Q5, and Q6 is N.
In some embodiments, Ring B is selected from the group consisting of phenyl, pyridine, pyrazine, pyridazine, pyrimidine, triazine, furan, thiophene, pyrrole, imidazole, oxazole, and thiazole. In some embodiments, Ring B is a 5-membered ring. In some embodiments, Ring B is a fused 5-membered ring
In some embodiments, the compound comprises at least one substituted or unsubstituted phenylpyridine ligand. In some embodiments, the compound comprises at least one substituted or unsubstituted acetyl-acetonate ligand.
In some embodiments, the compound is heteroleptic. In some embodiments, the compound is homoleptic. In some embodiments, the compound is neutral.
In some embodiments, LA has a structure selected from the group consisting of
In some embodiments, Ring B has a structure selected from the group consisting of:
wherein n is an integer from 1 to 480 and, for each n, substituents RD, RE, RF, and RG are selected as follows:
where R1 to R30 have the following structures:
In some embodiments, R in Formula I has a structure selected from the group consisting of
which can be further substituted;
where:
In some embodiments, at least one of X1, X2, and X3 is N, and R has the structure of
In some such embodiments, RCy is selected from the group consisting of halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aryl, heteroaryl, partially or fully deutereated variants thereof, partially or fully fluorinated variants thereof, and combinations thereof.
In some embodiments, the ligand LA is selected from the group consisting of LA1-1 to LA3600-344 defined as follows:
wherein i is an integer from 1 to 3600 and, for each LAi-m, RH, RI, and G are defined as follows:
wherein RH1 to RH30 have the following structures:
and
wherein G1 to G20 have the following structures:
In some embodiments, the compound has a formula of M(LA)p(LB)q(LC)r, where LB and LC are each a bidentate ligand; and where 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 such, embodiments, the compound has a formula selected from the group consisting of Ir(LA)3, Ir(LA)(LB)2, Ir(LA)2(LB), Ir(LA)2(LC), and Ir(LA)(LB)(LC); and wherein LA, LB, and LC are different from each other.
In some embodiments, LB and LC are each independently selected from the group consisting of
where:
In some embodiments, LB and LC are each independently selected from the group consisting of:
wherein:
In some embodiments, LB is selected from the group consisting of LB1 to LB264 with general formula of LBk (k is 1 to 264):
In some embodiments, LC is selected from the group consisting of LCj-I has a structure based on formula
and
LCj-II has a structure based on formula
wherein j is an integer from 1 to 1416, wherein for each LCj in LCj-I and LCj-II, R201 and R202 are each independently defined as follows:
where RD1 to RD246 have the following structures:
In some embodiments, the compound has a formula Ir(LAi-m)(LBk)2 or formula Ir(LAi-m)2(LBk) consisting of only those compounds that correspond to LBk ligands that correspond to the following structures LB1, LB2, LB18, LB28, LB38, LB108, LB118, LB122, LB124, LB126, LB128, LB130, LB32, LB134, LB136, LB138, LB140, LB142, LB144, LB156, LB58, LB160, LB162, LB164, LB168, LB172, LB175, LB204, LB206, LB214, LB216, LB218, LB220, LB222, LB231, LB233, LB235, LB237, LB240, LB242, LB244, LB246, LB248, LB250, LB252, LB254, LB256, LB258, LB260, LB262, LB263, and LB264.
In some embodiments, the compound has a formula r(LAi-m)(LBk)2 or formula r(LAi-m)2(LBk) consisting of only those compounds that correspond to LBk ligands that correspond to the following structures LB, LB2, LB18, LB28, LB38, LB108, LB118, LB122, LB124, LB126, LB128, LB132, LB136, LB138, LB142, LB156, LB162, LB204, LB206, LB214, LB216, LB218, LB220, LB231, LB233, LB237, and LB264.
In some embodiments, the compound has a formula Ir(LAi-m)2(LCj-I) or formula Ir(LAi-m)2(LCj-II) consisting of only those compounds that correspond to LCj-I and LCj-II ligands whose corresponding R1′ and R2′ are defined to be one of the following structures: RD1, RD3, RD4, RD5, RD9, RD10, RD17, RD18, RD20, RD22, RD37, RD40, RD41, RD42, RD43, RD48, RD49, RD50, RD54, RD55, RD58, RD59, RD78, RD79, RD81, RD87, RD88, RD89, RD93, RD116, RD117, RD118, RD119, RD120, RD133, RD134, RD135, RD136, RD143, RD144, RD145, RD146, RD147, RD149, RD151, RD154, RD155, RD156, RD161, RD175, RD190, RD193, RD200, RD201, RD206, RD210, RD214, RD215, RD216, RD218, RD219, RD220, RD227, RD237, RD241, RD242, RD245, and RD246.
In some embodiments, the compound has a formula Ir(LAi-m)2(LCj-I) or formula Ir(LAi-m)2(LCj-II) consisting of only those compounds that correspond to LCj-I and LCj-II ligands whose corresponding R1′ and R2′ are defined to be one of the following structures: RD1, RD3, RD4, RD5, RD9, RD17, RD22, RD43, RD50, RD78, RD116, RD118, RD133, RD134, RD135, RD136, RD143, RD144, RD145, RD146, RD149, RD151, RD154, RD155, RD156, RD190, RD193, RD200, RD214, RD218, RD220, RD241, and RD245.
In some embodiments, the compound has a formula Ir(LAi-m)2(LCj-I) consisting of only those compounds that correspond to LCj-I ligands that correspond to the following structures
In some embodiments, the compound has formula Ir(LAi-m)3, wherein i is an integer from 1 to 3600; m is an integer from 1 to 344; and the compound is selected from the group consisting of Ir(LA1-1)3 to Ir(LA3600-344)3; the compound has formula Ir(LAi-m)(LBk)2, wherein i is an integer from 1 to 3600; m is an integer from 1 to 344; k is an integer from 1 to 264; and the compound is selected from the group consisting of Ir(LA1-1)(LB1)2 to Ir(LA3600-344)(LB264)2; the compound has formula Ir(LAi-m)2(LBk), wherein i is an integer from 1 to 3600; m is an integer from 1 to 344; k is an integer from 1 to 264; and the compound is selected from the group consisting of Ir(LA1-1)2(LB1) to Ir(LA3600-344)2(LB264); and the compound has formula Ir(LAi-m)2(LCj-I) or Ir(LAi-m)2(LCj-II), wherein i is an integer from 1 to 3600; m is an integer from 1 to 344; j is an integer from 1 to 1416; and the compound is selected from the group consisting of Ir(LA1-1)2(LC1-I) to Ir(LA3600-344)2(LC1416-I), and Ir(LA1-1)2(LC1-II) to Ir(LA3600-344)2(LC1416-II).
In some embodiments, the compound is selected from the group consisting of
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 a first organic layer disposed between the anode and the cathode. The first organic layer can comprise a compound comprising a first ligand LA of Formula I
In Formula I:
where:
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 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 CnH2n+1, OCnH2n+1, OAr1, N(CnH2n+1)2, N(Ar1)(Ar2), CH═CH—CnH2n+, C≡CCnH2n+1, Ar1, Ar1—Ar2, CnH2n—Ar1, or no substitution, wherein n is 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, 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene, aza-triphenylene, aza-carbazole, aza-indolocarbazole, aza-dibenzothiophene, aza-dibenzofuran, aza-dibenzoselenophene, and aza-(5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene).
In some embodiments, the host may be selected from the HOST Group 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 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 comprising a first ligand LA of Formula I
In Formula I:
where:
In some emissive region embodiments, the compound can be an emissive dopant or a non-emissive dopant. In some emissive region embodiments, the emissive region comprises a host, wherein the host contains at least one group selected from the group consisting of metal complex, triphenylene, carbazole, dibenzothiophene, dibenzofuran, dibenzoselenophene, aza-triphenylene, aza-carbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene.
In some emissive region embodiments, the emissive region comprises a host, wherein the host is selected from the group consisting of the structures listed in the HOST Group defined herein.
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 can comprise a compound comprising a first ligand LA of Formula I
In Formula I:
where:
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.
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 F-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.
The simple layered structure illustrated in
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
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), 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.
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 phosphonic acid and silane derivatives; a metal oxide derivative, such as MoOx; 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. 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.
2,4-Dichloro-5-iodopyridine (6.00 g, 21.9 mmol) and copper(I) iodide (8.34 g, 43.8 mmol) were dissolved in dry N,N-dimethylformamide (DMF)(140 mL) and the reaction mixture was sparged with nitrogen for 15 minutes. Methyl 2,2-difluoro-2-(fluorosulfonyl)acetate (5.6 mL, 43.8 mmol) was added and the reaction mixture was heated at 100° C. for 3 hours. The mixture was allowed to cool to room temperature (˜22° C.), then it was diluted with water (100 mL) and extracted with diethyl ether (3×100 mL). The combined organic extracts were washed with water (100 mL), then brine (3×100 mL), then dried over magnesium sulfate and, finally, the solvents were removed in vacuo. 2,4-dichloro-5-(trifluoromethyl)pyridine was obtained as a yellow oil (4.55 g, 21.1 mmol, 96%) and was used in the next step without further purification.
2,4-dichloro-5-(trifluoromethyl)pyridine (4.55 g, 21.1 mmol), sodium carbonate (10.05 g, 94.8 mmol), 2-(4-tert-butyl-2-naphthyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (6.21 g, 20.0 mmol) were dissolved in dimethoxyethane (DME)(60 mL) and water (12 mL) in a 500 mL 3-necked round bottomed flask fitted with a reflux condenser. The mixture was then sparged with nitrogen for 15 minutes, followed by the addition of tetrakis(triphenylphosphine)palladium(0) (Pd(PPh3)4)(1.22 g, 1.05 mmol) and degasified for 15 minutes. The reaction mixture was heated at 90° C. under nitrogen for 18 hours. The reaction was then cooled to room temperature (˜22° C.) and filtered through a bed of silica gel, such as Celite diatomaceous earth distributed by Imersys Minerals California, Inc. Solvents were removed in vacuo and the crude was partitioned between brine (100 mL) and ethyl acetate (100 mL). The aqueous phase was extracted with ethyl acetate (3×100 mL), then combined with the organic extracts before being washed with water (100 mL), then brine (100 mL), then being dried over magnesium sulfate and having the solvents removed in vacuo. The resulting crude mixture was purified by flash chromatography using mixtures of isohexane and ethyl acetate in a standard silica gel column to yield 2-(4-(tert-butyl)naphthalen-2-yl)-4-chloro-5-(trifluoromethyl)pyridine as a white solid (6.13 g, 15.3 mmol, 72%).
2-(4-(tert-butyl)naphthalen-2-yl)-4-chloro-5-(trifluoromethyl)pyridine (5.55 g, 15.3 mmol), 4-biphenylboronic acid (4.53 g, 22.9 mmol), potassium phosphate tribasic (9.71 g, 45.8 mmol) and dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine (0.63 g, 1.53 mmol) were dissolved in toluene (60 mL) and water (6 mL) in a 500 mL 3-necked round bottomed flask fitted with a reflux condenser. The mixture was sparged with nitrogen for 15 minutes, followed by the addition of tris(dibenzylideneacetone) dipalladium (0) (Pd2dba3) (0.70 g, 0.763 mmol) and degasified for an additional 15 minutes. The resulting dark purple mixture was heated at 100° C. for 18 hours. The mixture was then allowed to cool to room temperature (˜22° C.) and the solvents were removed in vacuo. The crude was partitioned between water (100 mL) and ethyl acetate (100 mL), and the aqueous phase was extracted with ethyl acetate (3×100 mL). The combined organic extracts were washed with brine (100 mL), dried over magnesium sulfate, and the solvents removed in vacuo. The resulting crude mixture was purified by flash chromatography using mixtures of isohexane and ethyl acetate in a standard silica gel column, followed by recrystallization from isopropanol to afford the product as a white solid (4.21 g, 8.74 mmol, 57%).
To a solution was added 2-(4-(tert-butyl)naphthalen-2-yl)-4-phenyl-5-(trifluoromethyl)pyridine (1.14 g, 2.8 mmol, 1.6 equiv) and iridium(III) chloride hydrate (650 mg, 1.75 mmol, 1.0 equiv). The reaction mixture was sparged with nitrogen for 10 minutes then heated to 110° C. for 24 hours to form the intermediate μ-dichloride complex shown in the above synthesis scheme. After cooling to room temperature, 3,7-Diethylnonane-4,6-dione (1.19 g, 5.60 mmol, 1.6 equiv) and tetrahydrofuran (50 mL) were added to the reaction mixture. The mixture was sparged with nitrogen for 10 minutes. Powdered potassium carbonate (1.16 g, 8.40 mmol, 2.4 equiv) was added and the reaction mixture was heated to 45° C. for 18 hours. The reaction mixture was then cooled to room temperature, concentrated under reduced pressure, and the residue was diluted with methanol (50 mL) and water (50 mL). The red suspension was filtered and the solid washed with methanol (50 mL). The resulting solid was dissolved in dichloromethane (150 mL), dried over anhydrous sodium sulfate (30 g) then dry-loaded onto a bed of silica gel (20 g), such as Celite® diatomaceous earth distributed by Imersys Minerals California, Inc. The crude product was purified over silica gel (300 g), eluting with a gradient of 0 to 25% dichloromethane in hexanes to give bis[(2-(4-(tert-butyl)naphthalen-2-yl)-1′-yl)-4-phenyl-5-(trifluoromethyl) pyridin-1-yl]-(3,7-diethylnonane-4,6-dione-κ2O,O′)-iridium(III) (1.84 g, 54% over two steps).
A suspension of 4-([1,1′-biphenyl]-4-yl)-2-(4-(tert-butyl)naphthalen-2-yl)-5-(trifluoromethyl)pyridine (2.0 g, 4.17 mmol, 2.2 equiv) and iridium(III) chloride hydrate (0.6 g, 1.895 mmol, 1.0 equiv) in 2-ethoxyethanol (36 mL) and deionized ultrafiltrated (DIUF) water (12 mL) was heated at 100° C. 16 hours. After the reaction mixture was cooled to room temperature, DIUF water (50 mL) was added and the suspension filtered. The resulting intermediate μ-dichloride complex was obtained as a red solid, which was washed with DIUF water (50 mL) and methanol (50 mL) then used directly in the next step. 3,7-diethylnonane-4,6-dione (1.352 g, 6.37 mmol, 2.0 equiv) and powdered potassium carbonate (1.32 g, 9.55 mmol, 3.0 equiv) were added to a suspension of crude intermediate μ-dichloride complex shown in the above synthesis scheme (4.51 g, est. 3.18 mmol, 1.0 equiv) in methanol (40 mL) and dichloromethane (40 mL). The reaction mixture was stirred at 42° C. for 16 hours. The crude reaction mixture was concentrated under reduced pressure and the residue diluted with DIUF water (100 mL). The slurry was filtered and the a red solid residue was washed with methanol (100 mL). The crude residue was dissolved in a minimal amount of dichloromethane, adsorbed onto silica gel (24 g) and purified on an Interchim automated chromatography system (80 g Sorbtech silica gel cartridge), eluting with a gradient of 5 to 50% dichloromethane in hexanes. The product was triturated with methanol (100 mL) and dried under vacuum at ˜50° C. for 16 hours to give bis[4-([1,1′-biphenyl]-4-yl)-2-(4-(tert-butyl)naphthalen-2-yl)-1′-yl)-5-(trifluoromethyl)pyridin-1-yl]-(3,7-diethyl-4,6-nonanedionato-k2O,O′)-iridium(III) (1.92 g, 44% yield, 99.4% purity) as a red solid.
A suspension of 4-([1,1′-biphenyl]-4-yl)-2-(naphthalen-2-yl)-5-(trifluoromethyl)pyridine (2.81 g, 6.6 mmol, 2.2 equiv) and iridium(III) chloride hydrate (0.95 g, 3.0 mmol, 1.0 equiv) in 2-ethoxyethanol (30 mL) and DIUF water (10 mL) was heated at 100° C. for 16 hours. After cooling to room temperature, DIUF water (25 mL) was added. The resulting solid was filtered, washed with DIUF water (25 mL) and methanol (3×25 mL) to give crude intermediate μ-dichloride complex shown in the synthesis scheme as a red solid. 3,7-Diethylnonane-4,6-dione (1.282 g, 6.04 mmol, 2.0 equiv) and powdered potassium carbonate (1.252 g, 9.06 mmol, 3.0 equiv) were added to a suspension of the crude μ-dichloride complex (6.5 g, est. 3.02 mmol, 1.0 equiv) in methanol (50 mL) and dichloromethane (50 mL). The reaction mixture was stirred at 42° C. for 16 hours. The resulting crude reaction mixture was concentrated under reduced pressure and the residue diluted with DIUF water (50 mL). The red solid was filtered and washed with methanol (3×25 mL). The crude residue was dissolved in a minimal amount of dichloromethane, adsorbed onto silica gel (100 g) and purified on an Interchim automated chromatography system (220 g Sorbtech silica gel column), eluting with a gradient of 20 to 50% dichloromethane in hexanes The product obtained was triturated with refluxing methanol (250 mL), and filtered warm. The solid was dried under vacuum at 50° C. for 16 hours to give bis[4-([1,1′-biphenyl]-4-yl)-(2-(naphthalen-2-yl)-3′-yl)-5-(trifluoromethyl)pyridin-1-yl]-(3,7-diethyl-4,6-nonane-dionato-k2O,O′)-iridium(III) (1.9 g, 50% yield, 99.9% purity) as a red solid.
A suspension of 4,6-bis(4-(tert-butyl) naphthalen-2-yl)pyrimidine (3.28 g, 7.37 mmol, 2.2 equiv) in 2-ethoxyethyanol (98 mL) and DIUF water (32 mL) was sparged with nitrogen for ten minutes. Iridium(III) chloride hydrate (1.0 g, 3.35 mmol, 1.0 equiv) was added and the reaction mixture heated at 100° C. for 16 hours. The reaction mixture was cooled to room temperature, then DIUF water (100 mL) was added and the solid filtered. The crude intermediate μ-dichloride complex shown in the synthesis scheme above was obtained as a red solid, which was washed with DIUF water (500 mL) and methanol (3×100 mL) then used directly for the next step.
To a suspension of crude di-μ-chloro-tetrakis[(4-(4-(tert-butyl)-naphthalen-2-yl)-1′-yl)-6-(4-(tert-butyl)naphthalen-2-yl)pyrimidin-1-yl]diiridium(III) (the intermediate μ-dichloride complex) (˜3.35 mmol, 1.0 equiv) in methanol (200 mL) and dichloromethane (150 mL) were added 3,7-diethylnonane-4,6-dione (1.42 g, 6.70 mmol, 2.0 equiv) and powdered potassium carbonate (1.39 g, 10.05 mmol, 3.0 equiv). The reaction mixture was stirred at 40° C. for 16 hours. The reaction mixture was then concentrated under reduced pressure. The residue was adsorbed onto silica gel (120 g) and purified on an Interchim automated system (220 g Sorbtech silica gel cartridge), eluting with a gradient of 5-50% dichloromethane in hexanes over 45 minutes. The product obtained was triturated with methanol (250 mL) to give bis[4-((4-(tert-butyl)naphthalen-2-yl)-1′-yl)-6-(4-(tert-butyl)naphthalen-2-yl)-pyrimidin-2-yl]-(3,7-diethyl-4,6-nonanedionato-k2O,O′)iridium(III) (2.85 g, 66% yield) as a red solid.
To a solution was added 4,6-Di(naphthalen-2-yl)pyrimidine (2.09 g, 6.30 mmol, 1.8 equiv) and iridium(III) chloride hydrate (1.297 g, 3.5 mmol, 1.0 equiv). The reaction mixture was sparged with nitrogen for 5 minutes then heated at 75° C. for 18 hours to form the intermediate μ-dichloride complex. The reaction mixture was cooled and transferred to a 250 mL 3-necked round-bottom flask equipped with a thermocouple and a reflux condenser. 3,7-Diethylnonane-4,6-dione (1.49 g, 7.0 mmol, 4.0 equiv) and tetrahydrofuran (60 mL) were added and the mixture sparged with nitrogen for 10 minutes. Powdered potassium carbonate (1.45 g, 10.5 mmol, 6.0 equiv) was added then the reaction mixture stirred at 45° C. for 17 hours. After cooling to room temperature, the reaction mixture was concentrated under reduced pressure. The residue was diluted with methanol (100 mL) and water (50 mL). The red suspension was filtered and the solids washed with methanol (50 mL). The crude solid was purified over silica gel (400 g), eluting with a gradient of 0 to 15% tetrahydrofuran in hexanes. The recovered impure product was triturated with a 1 to 10 mixture of dichloromethane and methanol (110 mL) and filtered. The solid was repurified over silica gel (500 g), eluting with a gradient of 0 to 15% tetrahydrofuran in hexanes. The product was then triturated with a 1 to 10 mixture of dichloromethane and methanol (110 mL). The solid was filtered and dried under vacuum at 45° C. for 2 hours to give bis[(4-(naphthalen-2-yl)-3′-yl)-6-(naphthalen-2-yl)pyrimidin-3-yl]-(3,7-diethylnonane-4,6-dione-κ2O,O′)-iridium(III) (952 mg, 26% yield two steps) as a red solid.
All example devices were fabricated by high vacuum (<10-7 Torr) thermal evaporation. The anode electrode was 1,200 Å of indium tin oxide (ITO). The cathode consisted of 10 Å of Liq (8-hydroxyquinoline lithium) followed by 1,000 Å of aluminum (Al). 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 of LG101 (purchased from LG Chem) as the hole injection layer (HIL); 400 Å of HTM as a hole transporting layer (HTL); 50 Å of EBM as an electron blocking layer (EBL); 400 Å of an emissive layer (EML) containing RH as red host and 3% of emitter; and 350 Å of Liq (8-hydroxyquinoline lithium) doped with 35% of ETM as the electron transporting layer (ETL). Table 1 shows the thickness of the device layers and materials.
The chemical structures of the device materials are shown below:
Devices were fabricated using inventive example 1 and comparative examples 1 and 2. Upon fabrication, devices were tested for emission spectra, electroluminescent efficiency and power consumption. For this purpose, the sample was energized by a 2 channel Keysight B2902A SMU at a current density of 10 mA/cm2 and measured by a Photo Research PR735 Spectroradiometer. Radiance (W/str/cm2) from 380 nm to 1080 nm, and total integrated photon count were collected. Each device was then placed under a large area silicon photodiode for the JVL sweep. The integrated photon count of the device at 10 mA/cm2 was used to convert the photodiode current to photon count. The voltage was swept from 0 to a voltage equating to 200 mA/cm2. The EQE of each device was calculated using the total integrated photon count. The results are summarized in Table 2. Voltage and EQE of inventive examples are reported as relative numbers normalized to the results of the comparative example 2.
Table 2 is a summary of performance of electroluminescence devices that were evaluated. Compared to device 3 using comparative example 2, the inventive device (device 1) shows saturated red color and much narrower emission spectrum. In addition, EQE of the inventive device is 1.3 times higher than device 3. Compared to device 2, the inventive device (device 1) shows more saturated color and higher EQE. As a result, the inventive device emits more saturated red light and showed improved current efficiency.
A photoluminescence (PL) spectra of the inventive and comparative compounds measured in poly(methyl methacrylate) (PMMA) for inventive compound 2 and comparative compound 3. The values are shown in Table 3, below.
Inventive example 2 exhibits a much narrower emissions spectrum, while comparative example 3 shows a broad, slightly blue-shifted structural emission. In general, the FWHM for a phosphorescent emitter complex is broad, normally in the range of 60 to 100 nm. It has been a long-sought goal to achieve narrow FWHM. The narrower the FWHM, the better color purity for the display application. In the past OLED research, narrowing lineshape has been achieved nanometer by nanometer slowly. Current result is a remarkably unexpected result.
This application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Application No. 62/906,305, filed on Sep. 26, 2019, and U.S. Provisional Application No. 63/010,815, filed on Apr. 16, 2020, the entire contents of which are incorporated herein by reference.
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| 20150171348 | Stoessel | Jun 2015 | A1 |
| 20150295187 | Boudreault | Oct 2015 | A1 |
| 20150295188 | Kosuge | Oct 2015 | A1 |
| 20150364701 | Horiuchi | Dec 2015 | A1 |
| 20160111663 | Kim | Apr 2016 | A1 |
| 20160118606 | Inoue | Apr 2016 | A1 |
| 20170092880 | Boudreault | Mar 2017 | A1 |
| 20180097179 | Boudreault | Apr 2018 | A1 |
| 20190074458 | Lee | Mar 2019 | A1 |
| 20190296251 | Yen | Sep 2019 | A1 |
| 20210095196 | Yeager | Apr 2021 | A1 |
| Number | Date | Country |
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| 101935523 | Jan 2011 | CN |
| 104342117 | Feb 2015 | CN |
| 104418904 | Mar 2015 | CN |
| 105481903 | Apr 2016 | CN |
| 106632488 | May 2017 | CN |
| 107759639 | Mar 2018 | CN |
| 108191916 | Jun 2018 | CN |
| 108864196 | Nov 2018 | CN |
| 109705107 | May 2019 | CN |
| 109970804 | Jul 2019 | CN |
| 109970806 | Jul 2019 | CN |
| 110144213 | Aug 2019 | CN |
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| 1191612 | Mar 2002 | EP |
| 1725079 | Nov 2006 | EP |
| 2034538 | Mar 2009 | EP |
| 2066150 | Jun 2009 | EP |
| 200511610 | Jan 2005 | JP |
| 2007123392 | May 2007 | JP |
| 2007254297 | Oct 2007 | JP |
| 2008074939 | Apr 2008 | JP |
| 0139234 | May 2001 | WO |
| 0202714 | Jan 2002 | WO |
| 02015654 | Feb 2002 | WO |
| 03040257 | May 2003 | WO |
| 03060956 | Jul 2003 | WO |
| 2004093207 | Oct 2004 | WO |
| 2004107822 | Dec 2004 | WO |
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| 2005089025 | Sep 2005 | WO |
| 2005123873 | Dec 2005 | WO |
| 2006009024 | Jan 2006 | WO |
| 2006056418 | Jun 2006 | WO |
| 2006072002 | Jul 2006 | WO |
| 2006082742 | Aug 2006 | WO |
| 2006098120 | Sep 2006 | WO |
| 2006100298 | Sep 2006 | WO |
| 2006103874 | Oct 2006 | WO |
| 2006114966 | Nov 2006 | WO |
| 2006132173 | Dec 2006 | WO |
| 2007002683 | Jan 2007 | WO |
| 2007004380 | Jan 2007 | WO |
| 2007063754 | Jun 2007 | WO |
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| 2008056746 | May 2008 | WO |
| 2008101842 | Aug 2008 | WO |
| 2008132085 | Nov 2008 | WO |
| 2009000673 | Dec 2008 | WO |
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| 2009018009 | Feb 2009 | WO |
| 2009021126 | Feb 2009 | WO |
| 2009050290 | Apr 2009 | WO |
| 2009062578 | May 2009 | WO |
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| 2009066778 | May 2009 | WO |
| 2009066779 | May 2009 | WO |
| 2009086028 | Jul 2009 | WO |
| 2009100991 | Aug 2009 | WO |
| 2012053627 | Apr 2012 | WO |
| 2012141185 | Oct 2012 | WO |
| 2012147896 | Nov 2012 | WO |
| 2013094620 | Jun 2013 | WO |
| 2017168299 | Oct 2017 | WO |
| 2019097361 | May 2019 | WO |
| WO-2020170957 | Aug 2020 | WO |
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| Number | Date | Country | |
|---|---|---|---|
| 20210098717 A1 | Apr 2021 | US |
| Number | Date | Country | |
|---|---|---|---|
| 63010815 | Apr 2020 | US | |
| 62906305 | Sep 2019 | US |
