Patent Application
20250129034
present invention relates to an organic compound, and more specifically, to an organic compound with hole transport characteristics, and an organic light emitting diode including the same.
Interest in display devices is increasing according to the application to various fields. As one of the display devices, a technology of an organic light emitting display devices including an organic light emitting diode (OLED) is developing rapidly.
The OLED is a device for, when charges are injected into a light emitting layer formed between an anode and a cathode, emitting energies of excitons as light after forming electrons and holes in pair to form excitons. Compared to conventional display technologies, the OLED can implement a low voltage, consume relatively less power, have excellent colors, can be applied on a flexible substrate to be used variously, and can allow a display device to be freely adjusted in size.
The OLED can have an excellent viewing angle, contrast ratio, and the like compared to liquid crystal displays (LCDs) and do not require a backlight, making it lightweight and ultra-thin. The OLED is formed by arranging a plurality of organic layers, such as a hole injection layer, a hole transport layer, a hole transport auxiliary layer, an electron blocking layer, a light emitting layer, and an electron transport layer, between the cathode (electrode injection layer) and the anode (hole injection layer).
In the structure of the OLED, when a voltage is applied between two electrodes, electrons and holes are injected from the cathode and the anode, respectively, and excitons generated from the light emitting layer fall to a ground state to emit light.
Organic materials used in the OLED may be largely classified into light emitting materials and charge transport materials. The light emitting material is an important factor in determining the light emitting efficiency of the OLED, and the light emitting material should have high quantum efficiency, excellent mobility of electrons and holes, and exist uniformly and stably in the light emitting layer. The light emitting material is classified into light emitting materials such as blue, red, and green depending on colored light, and hosts and dopants are used to increase color purity and increase luminous efficiency through energy transfer as color materials.
In the case of fluorescent materials, only singlets of about 25% of the excitons formed in the light emitting layer are used to generate light, and triplets of 75% are mostly lost as heat, while phosphorescent materials has a luminous mechanism which converts both the singlets and the triplets into light.
The present invention is directed to providing an organic compound with hole transport characteristics.
In addition, the present invention is directed to providing an organic light emitting diode capable of improving operation voltage, efficiency, and lifetime characteristics by applying the organic compound to any one or more of a hole transport layer and a hole transport auxiliary layer.
In addition, the present invention is directed to providing an organic light emitting diode capable of implementing excellent color coordinates targeted by an any light emitting layer even when the hole transport layer and/or hole transport auxiliary layer including the organic compound are combined with a light emitting layer of any color.
Objects of the present invention are not limited to the above-described objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by embodiments of the present invention. In addition, it can be easily seen that the objects and advantages of the present invention can be achieved by means and combinations thereof which are described in the claims.
To achieve the objects, according to one aspect of the present invention, there may be provided an organic compound with a novel structure represented by Chemical Formula 1 below, and a definition of the Chemical Formula 1 below is the same as one described in the specification and the claims.
According to another aspect of the present invention, there may be provided an organic light emitting diode including a first electrode, a second electrode facing the first electrode, and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer may include one or more of a hole transport layer and a hole transport auxiliary layer, and the one or more of the hole transport layer and the hole transport auxiliary layer include an organic compound represented by Chemical Formula 1.
The organic compound represented by chemical formula 1 of the present invention can implement excellent hole transfer characteristics.
In addition, the one or more of the hole transport layer and the hole transport auxiliary layer of the organic light emitting diode of the present invention can improve operation voltage, efficiency, and lifetime characteristics of the organic light emitting diode by including the organic compound represented by Chemical Formula 1 of the present invention.
In addition, the organic light emitting diode of the present invention can implement excellent color coordinates targeted by the light emitting layer even when the hole transport layer and/or hole transport auxiliary layer including the organic compound represented by Chemical Formula 1 of the present invention are combined with the light emitting layer of any color.
Effects of the present invention are not limited to the above-described effects, and other effects that are not mentioned will be able to be clearly understood by those skilled in the art from the overall description of the specification.
The above-described objects, features, and advantages will be described below in detail with reference to the following embodiments, and thus those skilled in the art to which the present invention pertains will be able to easily carry out the technical spirit of the present invention. In describing the present invention, when it is determined that a detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted.
In the specification, when terms “including,” “having,” “consisting of,” “arranging,” “providing,” and the like are used, other portions can be added unless “-only” is used. When a component is expressed in the singular, it includes a case in which the component is provided as a plurality of components unless specifically stated otherwise.
In construing a component in the specification, the component is construed as including the margin of error even when there is no separate explicit description.
In the specification, the arrangement of an arbitrary component on an “upper portion (or a lower portion)” of a component or “above (or under)” the component may not only mean that the arbitrary component is disposed in contact with an upper surface (or a lower surface) of the component, but also mean that other components may be interposed between the component and the arbitrary component disposed above (or under) the component.
The term “halo” or “halogen” used herein includes fluorine, chlorine, bromine, and iodine.
The term “alkyl group” used herein indicates both linear alkyl radicals and branched alkyl radicals. Unless otherwise specified, the alkyl group contains 1 to 20 carbon atoms and includes methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, and the like, and additionally, the alkyl group may be substituted arbitrarily.
The term “cycloalkyl group” indicates cyclic alkyl radicals. Unless otherwise specified, the cycloalkyl group contains 3 to 20 carbon atoms and includes cyclopropyl, cyclopentyl, cyclohexyl, and the like, and additionally, the cycloalkyl group may be substituted arbitrarily.
The term “alkenyl group” indicates both linear alkene radicals and branched alkene radicals. Unless otherwise specified, the alkenyl group contains 2 to 20 carbon atoms, and additionally, the alkenyl group may be substituted arbitrarily.
The term “alkynyl group” used herein indicates both linear alkyne radicals and branched alkyne radicals. Unless otherwise specified, the alkynyl group contains 2 to 20 carbon atoms. Additionally, the alkynyl group may be substituted arbitrarily.
The terms “aralkyl group” or “arylalkyl group” used herein are used interchangeably and indicates an alkyl group having an aromatic group as a substituent, and additionally, the aralkyl group (arylalkyl group) may be substituted arbitrarily.
Unless otherwise specified, the term “carbon ring” used herein may be used as the term including both “cycloalkyl group”, which is an alicyclic ring group, and/or “aryl group (aromatic group)”, which is an aromatic ring group.
The term “aryl group” or “aromatic group” used herein is used with the same meaning, and the aryl group includes both single ring groups and polycyclic ring groups. The polycyclic ring may include “condensed ring,” which are two or more rings in which two carbons are common to two adjacent rings. Unless otherwise specified, the aryl group contains 6 to 60 carbon atoms, and additionally, the aryl group may be substituted arbitrarily.
The term “heterocyclic group” used herein indicates that one or more of the carbon atoms constituting the aryl group, the cycloalkyl group, and the aralkyl group (arylalkyl group) are substituted with a heteroatom such as oxygen (O), nitrogen (N), or sulfur (S), and additionally, the heterocycle may be substituted arbitrarily.
The terms “heteroalkyl group” and “heteroalkenyl group” used herein indicate that one or more of the carbon atoms constituting the same are substituted with heteroatoms such as oxygen (O), nitrogen (N), and sulfur (S), and additionally, the heteroalkyl group and the heteroalkenyl group may be substituted arbitrarily.
The term “substituted” used herein indicates that a substituent other than hydrogen (H) is bonded to the corresponding carbon.
Unless otherwise specified herein, a position to be substituted is not limited as long as it is a position where a hydrogen atom is substituted, that is, a position where a substituent may be substituted, and when two or more substituents are present, the substituents may be the same as or different from each other.
The objects and substituents defined in the specification may be the same as or different from each other unless otherwise specified.
Hereinafter, a structure of an organic compound according to the present invention and an organic light emitting diode including the same will be described in detail.
According to one embodiment of the present invention, the organic light emitting diode of the present invention may include a first electrode, a second electrode facing the first electrode, and an organic layer disposed between the first electrode and the second electrode. The organic layer may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer and optionally further include a hole transport auxiliary layer. A surface of a cathode may include a capping layer. Additionally, a seal cap containing a moisture absorbent may be bonded on the capping layer using a UV curable adhesive to form a protecting film (encapsulation layer or protecting layer) to protect the organic light emitting diode from oxygen or moisture in the atmosphere.
According to one embodiment of the present invention, the organic light emitting diode can be used in any one of a flat panel display device, a flexible display device, a monochromatic or white flat panel lighting device, a monochromatic or white flexible lighting device, a vehicle display device, and a display device for virtual or augmented reality, but is not limited thereto.
The first electrode may be an anode and may be made of ITO, IZO, tin-oxide, or zinc-oxide, which are conductive materials with a relatively high work function value, but is not limited thereto.
The second electrode may be a cathode and may include Al, Mg, Ca, Ag, or an alloy or combination thereof, which is a conductive material with a relatively low work function value, but is not limited thereto.
A hole injection layer (HIL) may be formed on the first electrode. A material for the hole injection layer may include HATCN, copper phthalocyanine (CuPc), 4,4′,4″-tris(3-methylphenylamino)triphenylamine (m-MTDATA), 4,4′,4″-tris(3-methylphenylamino)phenoxybenzene (m-MTDAPB), 4,4′,4″-tri(N-carbazolyl)triphenylamine (TCTA), 4,4′,4″-tris(N-(2-naphthyl)-N-phenylamino)-triphenylamine(2-TNATA), and the like, but is not limited thereto.
A hole transport layer (HTL) is disposed adjacent to a light emitting layer between the first electrode and the light emitting layer, and optionally, a hole transport auxiliary layer may be disposed on the hole transport layer, and the hole transport auxiliary layer may be preferably disposed. The hole transport layer and the hole transport auxiliary layer of the present invention should be made of a material with excellent hole transport characteristics, and in particular, a material for forming the hole transport auxiliary layer can minimize a difference in HOMO energy levels between the hole transport layer and the light emitting layer together with the excellent hole transport characteristics, and thus reduce the accumulation of holes at an interface between the hole transport auxiliary layer and the light emitting layer by adjusting the injection characteristics of holes, thereby reducing quenching in which excitons are annihilated by polarons at the interface. Therefore, it is possible to reduce a degradation phenomenon of the device, thereby stabilizing the device and increasing efficiency and lifetime of the device.
To satisfy the above characteristics, in the present invention, an organic compound represented by Chemical Formula 1 of the present invention was derived as a material for a hole transport layer and/or a hole transport auxiliary layer. The present invention was completed by experimentally confirming the excellent effects in which it was possible to increase the luminous efficiency and lifetime of the organic light emitting diode, reduce an operation voltage, and clearly implement a light emitting layer of any color when the organic compound represented by Chemical Formula 1 of the present invention was applied to the hole transport layer and/or the hole transport auxiliary layer.
One or more of the hole transport layer and the hole transport auxiliary layer of the organic light emitting diode of the present invention may each be made of an organic compound represented by Chemical Formula 1 below.
In Chemical Formula 1,
Ar1 may be any one of Chemical Formulas 2, 3, 4, and 5 below,
X may be O or S.
Any one of R15 to R19 of the above Chemical Formulas 2 to 5 may be bonded to L1 in Chemical Formula 1.
L1 to L3 may be the same as or different from each other and be each independently one selected from the group consisting of a single bond, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 60 carbon atoms, and a substituted or unsubstituted heteroarylalkyl group having 6 to 60 carbon atoms.
R1 to R20 and Ar2 may be the same as or different from each other and be each independently one selected from the group consisting of hydrogen, deuterium, a cyano group, a nitro group, a halogen, a hydroxy group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 24 carbon atoms, a substituted or unsubstituted heteroalkyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms, a substituted or unsubstituted heteroarylalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 carbon atoms, a substituted or unsubstituted heterocycloalkyl group having 3 to 20 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 1 to 30 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 30 carbon atoms, and a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms.
Two adjacent groups among R1 to R20 may be bonded to form a substituted or unsubstituted carbon ring structure.
Optionally, when L1 to L3, R1 to R20 and Ar2 are substituted, substituent groups may be one or more selected from the group consisting of deuterium, a cyano group, a nitro group, halogen, a hydroxy group, an alkyl group having 1 to 30 carbon atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 24 carbon atoms, a heteroalkyl group having 2 to 30 carbon atoms, an aralkyl group having 6 to 30 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, a heterocycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 30 carbon atoms, a heteroaryl group having 2 to 30 carbon atoms, a heteroarylalkyl group having 3 to 30 carbon atoms, an alkoxy group having 1 to 30 carbon atoms, an alkylsilyl group having 1 to 30 carbon atoms, an arylsilyl group having 6 to 30 carbon atoms, and an aryloxy group having 6 to 30 carbon atoms, and when a plurality of substituents are present, the substituents may be the same as or different from each other.
According to one embodiment of the present invention, Chemical Formula 1 is one in which Ar1 is selected as Chemical Formula 2 and can be represented by Chemical Formula 1-1 below.
According to one embodiment of the present invention, Chemical Formula 1 may be one represented by any one of Chemical Formulas 6 to 12 below. Chemical Formulas 6 to 9 below are one in which a bonding position of Chemical Formula 2, which is Ari, different in Chemical Formula 1-1, Chemical Formula 10 below is one in which Ar1 is selected as Chemical Formula 3, Chemical Formula 11 below is one in which Ar1 is selected as Chemical Formula 4, and Chemical Formula 12 below is one in which Ar1 is selected as Chemical Formula 5.
According to one embodiment of the present invention, Ar2 may be one selected from the group consisting of a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms, a substituted or unsubstituted heteroarylalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, and a substituted or unsubstituted cycloalkyl group having 3 to 20 carbon atoms.
According to one embodiment of the present invention, Ar2 may be one selected from the group consisting of a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirofluorenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted cyclohexyl group, a substituted or unsubstituted napthobenzofuranyl group, and a substituted or unsubstituted napthobenzothiophenyl group.
According to one embodiment of the present invention, L1 to L3 may be the same as or different from each other and be each independently one of a single bond or a substituted or unsubstituted phenylene group.
According to one embodiment of the present invention, a substituted or unsubstituted carbon ring structure formed by bonding two adjacent groups among R1 to R20 may have a monocyclic or polycyclic aryl group structure.
According to one embodiment of the present invention, the compound represented by Chemical Formula 1 may be one selected from the group consisting of Products P1 to P1091 below, but is not limited thereto as long as it is included in the definition of Chemical Formula 1.
According to one embodiment of the present invention, any one of the hole transport layer or the hole transport auxiliary layer of the organic light emitting diode may be made of an organic compound represented by Chemical Formula 1, and in this case, the other not made of the organic compound represented by Chemical Formula 1 among the hole transport layer and the hole transport auxiliary layer may be made of a hole transport material used in the art. Specific hole transport materials may include a compound selected from the group consisting of TPD, NPD, CBP, N4,N4,N4′,N4′-tetra([1,1′-biphenyl]-4-yl)-[1,1′-biphenyl]-4,4′-diamine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl)-4-amine and the like, but is not limited thereto.
According to the present invention, the light emitting layer may be formed by being doped with a dopant to increase the luminous efficiency and the like of the host and the device, and the light emitting layer may emit blue, green, or red light, but is not limited thereto, and may be combined with light emitting layers of various colors and color coordinates used in the organic light emitting diode. For example, CIEx coordinates of the blue light emitting layer may range from 0.01 to 0.15 and CIEy coordinates thereof may range from 0.03 to 0.07, while CIEx coordinates of the green light emitting layer may range from 0.19 to 0.32 and CIEy coordinates thereof may range from 0.65 to 0.76.
A dopant material and a host material may be selected depending on a color selected for the light emitting layer included in the organic light emitting diode of the present invention. For example, a doping concentration of the dopant may be adjusted in the range of 1 to 20 wt % based on the total weight of the host, but is not limited thereto, and may be, for example, 3 to 15 wt %, for example, 5 to 10 wt %, for example, 3 to 8 wt %, and for example, 2 to 7 wt %, but is not limited thereto.
For example, the host of the light emitting layer is a common material used in the art and may include 9,10-Bis(2-naphthyl)anthracene(ADN), CBP(4,4′-N,N′-dicarbazole-biphenyl), and mCP(1,3-bis(carbazol-9-yl), and the like, but is not limited thereto.
For example, the dopant of the light emitting layer is a common material used in the art and may include N1,N1,N6,N6-tetrakis(4-(1-silyl)phenyl)pyrene-1,6-diamine, iridium complex metal compound (e.g. Ir(ppy)3), and the like, but is not limited thereto.
An electron transport layer and an electron injection layer may be sequentially stacked between the light emitting layer and the second electrode. The material of the electron transport layer requires high electron mobility, and electrons may be stably supplied to the light emitting layer through smooth electron transport.
For example, the material of the electron transport layer may include Alq3(tris(8-hydroxyquinolinato)aluminum), Liq(8-hydroxyquinolinolatolithium), PBD(2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4oxadiazole), TAZ(3-(4-biphenyl)4-phenyl-5-tert-butylphenyl-1,2,4-triazole), BAlq(bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium), TPBi(2,2′,2-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole), ZADN(2-[4-(9,10-Di-2-naphthalen2-yl-2-anthracen-2-yl)phenyl]-1-phenyl-1H-benzoimidazole), and the like, and may be used in combination with a metal compound. Examples of the metal compounds may include Liq, LiF, NaF, KF, RbF, CsF, FrF, BeF2, MgF2, CaF2, SrF2, BaF2, RaF2, and the like, but are not limited thereto.
The electron injection layer serves to smoothly inject electrons, the material of the electron injection layer may be made of a metal compound, and the metal compound may include any one or more among Liq, LiF, NaF, KF, RbF, CsF, FrF, BeF2, MgF2, CaF2, SrF2, BaF2, and RaF2, for example, but is not limited thereto.
The intermediate A (Sub A) may be synthesized according to Reaction Formula 1 below, but is not necessarily limited thereto. (In Reaction Formula 1 below, X═O or S, Hal=Br or Cl)
The definition of L1, L3, and R1 to R19 of Sub A are the same as those defined in Chemical Formula 1.
The compound belonging to Sub A may be any one of Products Sub 1 to Sub 120 below, but it is only an example and not limited.
Table 1 below shows FD-MS values of Products Sub 1 to Sub 120.
Hereinafter, synthesis examples of some of the compounds belonging to Sub A will be described.
Naphtho[1,2-b]benzofuran-10-ylboronic acid (100.0 g, 381.6 mmol), 4-bromoaniline (65.64 g, 381.6 mmol), K2CO3 (105.5 g, 763.2 mmol), Pd(PPh3)4(8.82 g, 7.63 mmol), toluene (1000 mL), ethanol (350 mL), and water (350 mL) were added, stirred, and refluxed in a 5 L flask under nitrogen atmosphere. After the reaction was finished, an organic layer was extracted by using toluene and water. The extracted solution was treated with MgSO4 to remove remaining moisture, concentrated under reduced pressure, then purified by using a column chromatography method, and then recrystallized to obtain Sub 5-1 of 90.9 g (yield 77%).
4-bromo-9,9-dimethyl-9H-fluorene (40.0 g, 146.4 mmol), Sub 5-1 (45.3 g, 146.4 mmol), t-BuONa (28.1 g, 292.9 mmol), Pd2(dba)3 (2.68 g, 2.93 mmol), sphos (2.41 g, 5.86 mmol), and toluene (800 mL) were added, stirred, and refluxed in a 3 L flask under nitrogen atmosphere. After the reaction was finished, an organic layer was extracted by using toluene and water. The extracted solution was treated with MgSO4 to remove remaining moisture, concentrated under reduced pressure, then purified by using a column chromatography method, and then recrystallized to obtain Sub 5 of 120.5 g (yield 82%).
Sub 15 of 53.5 g (yield 85%) was obtained by the synthesis and purification using the manufacturing method of Sub 5 except that 4-bromo-9,9-diphenyl-9H-fluorene (40.0 g, 100.7 mmol) was used instead of 4-bromo-9,9-dimethyl-9H-fluorene.
Sub 86-1 of 85.9 g (77% yield) was obtained by the synthesis and purification using the manufacturing method of Sub 5-1 except that 4-bromo-9,9-dimethyl-9H-fluorene (100.0 g, 366.1 mmol) and (4-chlorophenyl)boronic acid (21.5 g, 107.5 mmol) were used.
Sub 86 of 64.1 g (78% yield) was obtained by the synthesis and purification using the manufacturing method of Sub 5 except that Sub 86-1 (40.0 g, 131.2 mmol) and Sub 5-1 (40.6 g, 131.2 mmol) were used.
Sub 42 of 60.7 g (yield 75%) was obtained by the synthesis and purification using the manufacturing method of Sub 5 except that 1-bromo-9,9-dimethyl-9H-fluorene (35.3 g, 129.3 mmol) and 3-(naphtho[1,2-b]benzofuran-10-yl)aniline (40.0 g, 129.3 mmol) were used.
Sub 18 of 51.6 g (yield 76%) was obtained by the synthesis and purification using the manufacturing method of Sub 5 except that 10-bromobenzo[b]naphtho[2,1-d]thiophene (37.6 g, 120.0 mmol) and 9,9-diphenyl-9H-fluoren-2-amine (40.0 g, 120.0 mmol) were used.
Sub 10-1 of 82.6 g (75% yield) was obtained by the synthesis and purification using the manufacturing method of Sub 5-1 except that 10-bromobenzo[b]naphtho[2,1-d]thiophene (100.0 g, 319.3 mmol) and (4-chlorophenyl)boronic acid (49.9 g, 319.3 mmol) were used.
Sub 10 of 52.5 g (yield 80%) was obtained by the synthesis and purification using the manufacturing method of Sub 5 except that Sub 10-1 (40.0 g, 116.0 mmol) and 9,9-dimethyl-9H-fluoren-4-amine (24.3 g, 116.0 mmol) were used.
Sub 82-1 of 83.9 g (70% yield) was obtained by the synthesis and purification using the manufacturing method of Sub 5-1 except that (9,9-dimethyl-9H-fluoren-2-yl)boronic acid (100.0 g, 420.0 mmol) and 3-bromoaniline (72.3 g, 420.0 mmol) were used.
Sub 82 of 48.9 g (yield 74%) was obtained by the synthesis and purification using the manufacturing method of Sub 5 except that Sub 82-1 (36.4 g, 127.7 mmol) and 10-bromobenzo[b]naphtho[2,1-d]thiophene (40.0 g, 127.7 mmol) were used.
Sub 17 of 46.0 g (yield 74%) was obtained by the synthesis and purification using the manufacturing method of Sub 5 except that 10-bromobenzo[b]naphtho[2,1-d]thiophene (37.6 g, 120.0 mmol) and 9,9-diphenyl-9H-fluoren-3-amine (40.0 g, 120.0 mmol) were used.
The final compound (is referred to as “product” and is the same as Formula 1-1), which is a compound belonging to Formula 1-1 in which Ar1 in Chemical Formula 1 of the present invention is selected as Chemical Formula 2, may be synthesized as represented by Reaction Formula 2 below, but is not limited thereto. (In Reaction Formula 2 below, X═O or S, Hal=Br or Cl)
Sub 5 (8.0 g, 15.95 mmol), 4-bromo-1,1′-biphenyl (4.09 g, 17.54 mmol), t-BuONa (3.07 g, 31.90 mmol), Pd2(dba)3 (0.29 g, 0.32 mmol), sphos (0.26 g, 0.64 mmol), and toluene (100 mL) were added, stirred, and refluxed in a 500 mL flask under nitrogen atmosphere. After the reaction was finished, an organic layer was extracted by using toluene and water. The extracted solution was treated with MgSO4 to remove remaining moisture, concentrated under reduced pressure, then purified by using a column chromatography method, and then recrystallized to obtain Compound P 44 of 7.30 g (yield 70%).
Compound P 45 of 7.52 g (yield 67%) was obtained by synthesis and purification in the same manner as the manufacturing method of Compound P 44 except that 2-(4-bromophenyl)naphthalene (4.97 g, 17.54 mmol) was used instead of 4-bromo-1,1′-biphenyl.
Compound P 29 of 7.97 g (yield 72%) was obtained by synthesis and purification using the manufacturing method of Compound P 44 except that 2-bromo-9,9-dimethyl-9H-fluorene (4.79 g, 17.54 mmol) was used instead of 4-bromo-1,1′-biphenyl.
Compound P 31 of 7.19 g (yield 65%) was obtained by synthesis and purification using the manufacturing method of Compound P 44 except that 3-bromo-9,9-dimethyl-9H-fluorene (4.79 g, 17.54 mmol) was used instead of 4-bromo-1,1′-biphenyl.
Compound P 387 of 7.11 g (yield 74%) was obtained by synthesis and purification in the same manner as the manufacturing method of Compound P 44 except that Sub 15 (8.0 g, 12.78 mmol) and 1-bromonaphthalene (2.91 g, 14.06 mmol) were used.
Compound P 71 of 7.88 g (yield 78%) was obtained by synthesis and purification in the same manner as the manufacturing method of Compound P 44 except that Sub 86 (8.00 g, 13.85 mmol) and 4-bromo-1,1′-biphenyl (3.55 g, 15.23 mmol) were used.
Compound P 117 of 7.24 g (yield 68%) was obtained by synthesis and purification in the same manner as the manufacturing method of Compound P 44 except that Sub 42 (8.00 g, 15.95 mmol) and 2-bromodibenzo[b,d]furan (4.34 g, 17.54 mmol) were used.
Compound P 641 of 6.14 g (yield 65%) was obtained by synthesis and purification in the same manner as the manufacturing method of Compound P 44 except that Sub 18 (8.00 g, 14.14 mmol) and 1-(4-bromophenyl)naphthalene (4.41 g, 15.56 mmol) were used.
Compound P 228 of 7.99 g (yield 68%) was obtained by synthesis and purification in the same manner as the manufacturing method of Compound P 44 except that Sub 10 (8.00 g, 15.45 mmol) and 4-(4-bromophenyl)dibenzo[b,d]furan (5.50 g, 17.00 mmol) were used.
Compound P 311 of 7.49 g (yield 66%) was obtained by synthesis and purification in the same manner as the manufacturing method of Compound P 44 except that Sub 82 (4.79 g, 17.54 mmol) and 10-bromonaphtho[1,2-b]benzofuran (4.79 g, 17.54 mmol) were used.
Compound P 640 of 6.90 g (yield 68%) was obtained by synthesis and purification in the same manner as the manufacturing method of Compound P 44 except that Sub 17 (8.00 g, 14.14 mmol) and 3-bromo-1,1′-biphenyl (3.63 g, 15.56 mmol) were used.
Table 2 below shows FD-MS values of some of the final compounds
A positive electrode was formed with ITO on a substrate on which a reflective layer was formed and surface-treated with N2 plasma or UV-ozone. HAT-CN was deposited above the positive electrode in a thickness of 10 nm as a hole injection layer (HIL). Subsequently, the hole transport layer (HTL) was formed by depositing Compound P 5 in a thickness of 110 nm. A hole transport auxiliary layer was formed above the hole transport layer by forming N4,N4,N4′,N4′-tetra([1,1′-biphenyl]-4-yl)-[1,1′-biphenyl]-4,4′-diamine in a thickness of 15 nm through vacuum deposition, and to form a blue light emitting layer as the light emitting layer (EML) above the hole transport auxiliary layer, N1,N1,N6,N6-tetrakis(4-(1-silyl)phenyl)pyrene-1,6-diamine as a dopant was doped at about 3 wt % while 9,10-Bis(2-naphthyl)anthracene (ADN) as a host was deposited in a thickness of 25 nm. An electron transport layer (ETL) was deposited above the blue light emitting layer in a thickness of 30 nm by mixing anthracene derivative and Liq at a mass ratio of 1:1, and Liq as an electron injection layer (EIL) was deposited above the electron transport layer (ETL) in a thickness of 1 nm. Then, a mixture mixing magnesium and silver (Ag) at 9:1 was deposited in a thickness of 15 nm as a negative electrode, and N4,N4′-bis[4-[bis(3-Methylphenyl)amino]phenyl]-N4,N4′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (DNTPD) as a capping layer was deposited above the negative electrode in a thickness of 60 nm. An organic light emitting diode was manufactured by bonding a seal cap containing a moisture absorbent on the capping layer using a UV curable adhesive and forming a protecting film (encapsulation layer or protecting layer) to protect the organic light emitting diode from oxygen or moisture in the atmosphere.
Organic light emitting diodes of Examples 2 to 106 and Comparative Example 1 were manufactured in the same manner as Example 1 except that the material of Compound P 5 used as the material for a hole transport layer in Example 1 was changed to one expressed in Table 3 below. The material for a hole transport layer used in Comparative Example 1 is as follows.
For the organic light emitting diodes manufactured in Examples 1 to 106 and Comparative Example 1, operation voltage (unit: V) and efficiency, which are light-emitting characteristics when driven at a current of 10 mA/cm2, and lifetime (T95, unit: hrs) reduced by 95% when driven at a constant current of 20 mA/cm2 were measured, and thus a result of measurement is expressed in Table 3 below.
A positive electrode was formed with ITO on a substrate on which a reflective layer was formed and surface-treated with N2 plasma or UV-ozone. HAT-CN was deposited above the positive electrode in a thickness of 10 nm as a hole injection layer (HIL). Subsequently, a hole transport layer (HTL) was formed by depositing N4,N4,N4′,N4′-tetra([1,1′-biphenyl]-4-yl)-[1,1′-biphenyl]-4,4′-diamine in a thickness of 110 nm. A hole transport auxiliary layer was formed by forming Compound P 5 the present invention above the hole transport layer by vacuum deposition in a thickness of 40 nm, and to form a green light emitting layer (EML) above the hole transport auxiliary layer, Ir(ppy)3[tris(2-phenylpyridine)-iridium] as a dopant was doped at about 5 wt % while 4,4′-N,N′-dicarbazole-biphenyl(CBP) as a host was deposited in a thickness of 35 nm. An electron transport layer (ETL) was deposited above the green light emitting layer in a thickness of 30 nm by mixing anthracene derivative and Liq at a mass ratio of 1:1, and Liq as an electron injection layer (EIL) was deposited above the electron transport layer (ETL) in a thickness of 1 nm. Then, a mixture mixing magnesium and silver (Ag) at 1:4 was deposited in a thickness of 16 nm as a negative electrode, and N4,N4′-bis[4-[bis(3-Methylphenyl)amino]phenyl]-N4,N4′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (DNTPD) as a capping layer was deposited above the negative electrode in a thickness of 60 nm. An organic light emitting diode was manufactured by bonding a seal cap containing a moisture absorbent on the capping layer using a UV curable adhesive and forming a protecting film (encapsulation layer or protecting layer) to protect the organic light emitting diode from oxygen or moisture in the atmosphere.
Organic light emitting diodes of Examples 108 to 212 and Comparative Example 2 were each manufactured in the same manner as Example 107 except that the material of Compound P 5 used as the material for a hole transport auxiliary layer in Example 107 was changed to one expressed in Table 4 below. The material for a hole transport auxiliary layer used in Comparative Example 2 is as follows.
For the organic light emitting diodes manufactured in Examples 107 to 212 and Comparative Example 2, operation voltage (unit: V) and efficiency, which are light-emitting characteristics when driven at a current of 10 mA/cm2 and lifetime (T95, unit: hrs) reduced by 95% when driven at a constant current of 20 mA/cm2 were measured, and thus a result of measurement is expressed in Table 4 below.
Although the embodiments of the specification have been described in more detail, the specification is not necessarily limited to these embodiments, and various modifications can be made without departing from the technical spirit of the specification. Therefore, the embodiments disclosed in the present specification are not intended to limit the technical spirit of the present specification, but for describing it, and the scope of the technical spirit of the present specification is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative and not restrictive in all respects.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0042440 | Apr 2022 | KR | national |
| 10-2023-0044903 | Apr 2023 | KR | national |
The present application is a Continuation of PCT application number PCT/KR2023/004631, filed on Apr. 5, 2023, which is based upon and claims the benefit of priorities to Korean Patent Application Nos. 10-2022-0042440, filed on Apr. 5, 2022, and 10-2023-0044903, filed on Apr. 5, 2023, in the Korean Intellectual Property Office. All of the aforementioned applications are hereby incorporated by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/KR2023/004631 | Apr 2023 | WO |
| Child | 18906085 | US |
