KR101647197B1 - Carbazole derivatives and organic light emitting device comprising the same - Google Patents

Abstract

The present invention provides a carbazole derivative and an organic light emitting device comprising the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a carbazole derivative and an organic light emitting device including the same. BACKGROUND ART [0002]

This specification claims the benefit of Korean Patent Application No. 10-2013-0114653, filed on September 26, 2013, to the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference.

The present invention relates to a carbazole derivative and an organic light emitting device including the same.

The organic light emission phenomenon is one example in which current is converted into visible light by an internal process of a specific organic molecule. The principle of organic luminescence phenomenon is as follows.

When an organic layer is positioned between the anode and the cathode, when a voltage is applied between the two electrodes, electrons and holes are injected into the organic layer from the cathode and the anode, respectively. Electrons and holes injected into the organic material layer recombine to form an exciton, and the exciton falls back to the ground state to emit light. An organic light emitting device using such a principle may be generally composed of an organic material layer including a cathode, an anode, and an organic material layer disposed therebetween, for example, a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer.

As a material used in an organic light emitting device, a pure organic material or a complex in which an organic material and a metal form a complex is mostly used. Depending on the application, a hole injecting material, a hole transporting material, a light emitting material, an electron transporting material, . As the hole injecting material and the hole transporting material, an organic material having a p-type property, that is, an organic material that is easily oxidized and electrochemically stable at the time of oxidation is mainly used. On the other hand, as an electron injecting material or an electron transporting material, an organic material having an n-type property, that is, an organic material that is easily reduced and electrochemically stable when being reduced is mainly used. As the light emitting layer material, a material having both a p-type property and an n-type property, that is, a material having both a stable form in oxidation and in a reduced state is preferable, and a material having a high luminous efficiency for converting an exciton into light desirable.

Therefore, there is a need in the art to develop new organic materials.

Korean Patent Publication No. 2007-0003586

It is an object of the present invention to provide a carbazole derivative and an organic light emitting device including the same.

In one embodiment of the present invention, there is provided a carbazole derivative represented by the following general formula (1).

[Chemical Formula 1]

In formula (1)

L1 and L2 are the same or different from each other, and are each independently a direct bond; A substituted or unsubstituted arylene group; Or a substituted or unsubstituted divalent heterocyclic group,

A substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkoxy group, Or a substituted or unsubstituted alkenyl group,

R1 to R4 are the same or different from each other and each independently hydrogen; heavy hydrogen; A halogen group; A nitrile group; A nitro group; A hydroxy group; Carbonyl group; An ester group; Imide; An amide group; A substituted or unsubstituted alkyl group; A substituted or unsubstituted cycloalkyl group; A substituted or unsubstituted alkoxy group; A substituted or unsubstituted aryloxy group; A substituted or unsubstituted alkylthio group; A substituted or unsubstituted arylthio group; A substituted or unsubstituted alkylsulfoxy group; A substituted or unsubstituted arylsulfoxy group; A substituted or unsubstituted alkenyl group; A substituted or unsubstituted silyl group; A substituted or unsubstituted boron group; A substituted or unsubstituted alkylamine group; A substituted or unsubstituted aralkylamine group; A substituted or unsubstituted arylamine group; A substituted or unsubstituted heteroarylamine group; A substituted or unsubstituted arylphosphine group; A substituted or unsubstituted phosphine oxide group; A substituted or unsubstituted aryl group; A substituted or unsubstituted fluorenyl group; A substituted or unsubstituted carbazole group; A substituted or unsubstituted benzocarbazole group; A substituted or unsubstituted triazine group; Or a substituted or unsubstituted aromatic or aliphatic heterocyclic group, or forms an aliphatic, aromatic, aliphatic hetero or aromatic heterocyclic ring with an adjacent group or forms a spiro bond,

n is an integer of 0 to 7,

c is an integer of 0 to 7,

When n is 2 or more, R "are the same or different from each other,

When c is 2 or more, R1 is the same as or different from each other.

In addition, in one embodiment of the present specification, the first electrode; A second electrode facing the first electrode; And at least one organic material layer including a light emitting layer provided between the first electrode and the second electrode, wherein at least one of the organic material layers includes the carbazole derivative .

The carbazole derivatives according to the embodiments of the present disclosure have appropriate energy levels and are excellent in electrochemical stability and thermal stability. Therefore, the organic light emitting device including the carbazole derivative provides high efficiency and / or high driving stability.

1 to 5 are cross-sectional views illustrating the structure of an organic light emitting diode according to an embodiment of the present invention.
Figures 6 and 7 show the MS data results of the compounds of formulas 1-7, which are the compounds prepared in the examples.

Hereinafter, the present invention will be described in more detail.

In one embodiment of the present invention, a carbazole derivative represented by Formula 1 is provided.

In one embodiment of the present invention, the carbazole derivative represented by Formula 1 is substituted with a substituted or unsubstituted fluorenyl group with L2 as a linking group at the 4-position of the carbazole group.

In one embodiment of the present invention, when the fluorenyl group is substituted at the 4-position of the carbazole group, there is an effect of inhibiting crystallization and providing a long-life device.

In one embodiment of the present invention, when an arylene group is used as a linking group at the 4-position of the carbazole group, high triplet energy is obtained and a high-efficiency device can be realized.

In one embodiment of the present invention, the carbazole derivative represented by the formula (1) is obtained by substituting a substituted or unsubstituted fluorenyl group with L2 as a linking group at the 4-position of the carbazole group and substituting N of the carbazole group Or an unsubstituted triazine group; A substituted or unsubstituted pyrimidine group; A substituted or unsubstituted pyridine group; A substituted or unsubstituted pyridazine group; Or a substituted or unsubstituted pyrazine group is substituted.

In one embodiment of the present invention, when N in the carbazole group is substituted with a triazine group, a pyrimidine group, a pyridine group, a pyridazine group, or a pyrazine group, the electron affinity is high and the effect of facilitating the injection of electrons into the light- .

는 다른 치환기 또는 결합부에 결합되는 부위를 의미한다.In the present specification,

Quot; refers to a moiety bonded to another substituent or bond.

In one embodiment of the present specification, R4 is a substituted or unsubstituted aryl group; Or a substituted or unsubstituted aromatic or aliphatic heterocyclic group.

In one embodiment of the present specification, R4 is a substituted or unsubstituted aromatic or aliphatic heterocyclic group containing at least one of N, O and S atoms.

In one embodiment of the present specification, R4 is a substituted or unsubstituted aromatic or aliphatic heterocyclic group containing at least one N atom.

In one embodiment of the present specification, R4 is a substituted or unsubstituted monocyclic aromatic or aliphatic heterocyclic group containing at least one N atom.

In one embodiment of the present specification, R4 is a substituted or unsubstituted monocyclic aromatic or aliphatic heterocyclic group containing 2 or more N atoms.

In one embodiment of the present specification, R4 is a substituted or unsubstituted monocyclic aromatic or aliphatic heterocyclic group containing 2 N atoms.

In one embodiment of the present specification, R4 is a substituted or unsubstituted monocyclic aromatic or aliphatic heterocyclic group containing 3 N atoms.

In one embodiment of the present specification, R4 is any one of the following substituents.

R10 to R13 are the same or different from each other, and each independently hydrogen; heavy hydrogen; A halogen group; A nitrile group; A nitro group; A hydroxy group; Carbonyl group; An ester group; Imide; Amide group; A substituted or unsubstituted alkyl group; A substituted or unsubstituted cycloalkyl group; A substituted or unsubstituted alkoxy group; A substituted or unsubstituted aryloxy group; A substituted or unsubstituted alkylthio group; A substituted or unsubstituted arylthio group; A substituted or unsubstituted alkylsulfoxy group; A substituted or unsubstituted arylsulfoxy group; A substituted or unsubstituted alkenyl group; A substituted or unsubstituted silyl group; A substituted or unsubstituted boron group; A substituted or unsubstituted alkylamine group; A substituted or unsubstituted aralkylamine group; A substituted or unsubstituted arylamine group; A substituted or unsubstituted heteroarylamine group; A substituted or unsubstituted imine group; A substituted or unsubstituted arylphosphine group; A substituted or unsubstituted phosphine oxide group; A substituted or unsubstituted aryl group; A substituted or unsubstituted fluorenyl group; A substituted or unsubstituted carbazole group; A substituted or unsubstituted benzocarbazole group; A substituted or unsubstituted triazine group; Or a substituted or unsubstituted aromatic or aliphatic heterocyclic group containing at least one of N, O and S atoms.

When the substituent is substituted at the N-position of the carbazole group, there is an effect that the electron injection and the electron mobility are varied to widen the light emitting region in the light emitting layer.

In one embodiment of the present disclosure, L1 is a direct bond; Or a substituted or unsubstituted phenylene group.

In one embodiment of the present specification, L2 is a substituted or unsubstituted phenylene group.

Illustrative examples of such substituents are set forth below, but are not limited thereto.

As used herein, the term " substituted or unsubstituted " A halogen group; A nitrile group; A nitro group; Imide; Amide group; A hydroxy group; Thiol group; An alkyl group; An alkenyl group; An alkoxy group; A cycloalkyl group; Silyl group; An arylalkenyl group; An aryl group; An aryloxy group; An alkyloxy group; Arylthioxy group; An alkylsulfoxy group; Arylsulfoxy group; Silyl group; Boron group; An alkylamine group; An aralkylamine group; An arylamine group; A heteroaryl group; Carbazole group; An aryl group; A fluorenyl group; Arylalkyl groups; An arylalkenyl group; And a heterocyclic group containing at least one of N, O, S, Se and Si atoms, or a substituted or unsubstituted one or more substituents selected from the group consisting of N, O, S, Se and Si atoms. For example, the "substituent group to which two or more substituents are connected" may be a biphenyl group. That is, the biphenyl group may be an aryl group, and may be interpreted as a substituent in which two phenyl groups are connected.

In the present specification, examples of the halogen group include fluorine, chlorine, bromine or iodine.

In the present specification, the ester group may be substituted with a straight-chain, branched or cyclic alkyl group having 1 to 25 carbon atoms or an aryl group having 6 to 25 carbon atoms in the ester group. Specifically, it may be a compound of the following structural formula, but is not limited thereto.

In the present specification, the carbon number of the imine group is not particularly limited, but is preferably 1 to 25 carbon atoms. Specifically, it may be a compound having the following structure, but is not limited thereto.

In the present specification, the amide group may be mono- or di-substituted by nitrogen of the amide group with hydrogen, a straight-chain, branched-chain or cyclic alkyl group having 1 to 25 carbon atoms or an aryl group having 6 to 25 carbon atoms. Specifically, it may be a compound of the following structural formula, but is not limited thereto.

In the present specification, the carbon number of the carbonyl group is not particularly limited, but is preferably 1 to 50 carbon atoms. Specifically, it may be a compound having the following structure, but is not limited thereto.

In the present specification, the number of carbon atoms of the imide group is not particularly limited, but is preferably 2 to 50 carbon atoms. Specifically, it may be a compound having the following structure, but is not limited thereto.

In the present specification, the alkyl group may be linear or branched, and the number of carbon atoms is not particularly limited, but is preferably 1 to 50. Specific examples include methyl, ethyl, propyl, n-propyl, isopropyl, butyl, n-butyl, isobutyl, tert-butyl, sec- N-pentyl, 3-dimethylbutyl, 2-ethylbutyl, heptyl, n-hexyl, N-octyl, 2-ethylhexyl, 2-propylpentyl, n-nonyl, 2,2-dimethyl Heptyl, 1-ethyl-propyl, 1,1-dimethyl-propyl, isohexyl, 2-methylpentyl, 4-methylhexyl, 5-methylhexyl and the like.

In the present specification, the cycloalkyl group is not particularly limited, but preferably has 3 to 60 carbon atoms. Specific examples thereof include cyclopropyl, cyclobutyl, cyclopentyl, 3-methylcyclopentyl, 2,3-dimethylcyclopentyl, But are not limited to, 3-methylcyclohexyl, 4-methylcyclohexyl, 2,3-dimethylcyclohexyl, 3,4,5-trimethylcyclohexyl, 4-tert- butylcyclohexyl, cycloheptyl, Do not.

In the present specification, the alkoxy group may be linear, branched or cyclic. The number of carbon atoms of the alkoxy group is not particularly limited, but is preferably 1 to 25 carbon atoms. Specific examples include methoxy, ethoxy, n-propoxy, isopropoxy, i-propyloxy, n-butoxy, isobutoxy, tert-butoxy, sec-butoxy, n-pentyloxy, neopentyloxy, N-hexyloxy, n-hexyloxy, 3,3-dimethylbutyloxy, 2-ethylbutyloxy, n-octyloxy, n-nonyloxy, n-decyloxy, benzyloxy, But is not limited thereto.

In the present specification, the alkenyl group may be straight-chain or branched, and the number of carbon atoms is not particularly limited, but is preferably 2 to 40. Specific examples include vinyl, 1-propenyl, isopropenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, Butenyl, allyl, 1-phenylvinyl-1-yl, 2-phenylvinyl-1-yl, (Diphenyl-1-yl) vinyl-1-yl, stilbenyl, stilenyl, and the like.

In the present specification, the aryl group may be a monocyclic aryl group or a polycyclic aryl group, and includes a case where an alkyl group having 1 to 25 carbon atoms or an alkoxy group having 1 to 25 carbon atoms is substituted. In addition, an aryl group in the present specification may mean an aromatic ring.

When the aryl group is a monocyclic aryl group, the number of carbon atoms is not particularly limited, but is preferably 6 to 25 carbon atoms. Specific examples of the monocyclic aryl group include, but are not limited to, a phenyl group, a biphenyl group, a terphenyl group, and a stilbenyl group.

When the aryl group is a polycyclic aryl group, the number of carbon atoms is not particularly limited. And preferably has 10 to 24 carbon atoms. Specific examples of the polycyclic aryl group include, but are not limited to, a naphthyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a perylenyl group, a klycenyl group and a fluorenyl group.

In the present specification, a fluorenyl group may be substituted, and two substituents may be bonded to each other to form a spiro structure.

,

,

및

등이 될 수 있다. 다만, 이에 한정되는 것은 아니다.When the fluorenyl group is substituted,

,

,

And

And the like. However, the present invention is not limited thereto.

In the present specification, the silyl group specifically includes a trimethylsilyl group, a triethylsilyl group, a t-butyldimethylsilyl group, a vinyldimethylsilyl group, a propyldimethylsilyl group, a triphenylsilyl group, a diphenylsilyl group, But are not limited thereto.

In the present specification, the number of carbon atoms of the amine group is not particularly limited, but is preferably 1 to 30. Specific examples of the amine group include a methylamine group, a dimethylamine group, an ethylamine group, a diethylamine group, a phenylamine group, a naphthylamine group, a biphenylamine group, an anthracenylamine group, a 9- , A diphenylamine group, a phenylnaphthylamine group, a ditolylamine group, a phenyltolylamine group, a triphenylamine group, and the like, but are not limited thereto.

In the present specification, examples of the arylamine group include a substituted or unsubstituted monoarylamine group, a substituted or unsubstituted diarylamine group, or a substituted or unsubstituted triarylamine group. The aryl group in the arylamine group may be a monocyclic aryl group or a polycyclic aryl group. The arylamine group having at least two aryl groups may contain a monocyclic aryl group, a polycyclic aryl group, or a monocyclic aryl group and a polycyclic aryl group at the same time.

Specific examples of the arylamine group include phenylamine, naphthylamine, biphenylamine, anthracenylamine, 3-methylphenylamine, 4-methyl-naphthylamine, 2-methyl- But are not limited to, cenylamine, diphenylamine, phenylnaphthylamine, ditolylamine, phenyltolylamine, carbazole and triphenylamine groups.

In the present specification, examples of the arylphosphine group include a substituted or unsubstituted monoarylphosphine group, a substituted or unsubstituted diarylphosphine group, or a substituted or unsubstituted triarylphosphine group. The aryl group in the arylphosphine group may be a monocyclic aryl group or a polycyclic aryl group. The arylphosphine group having at least two aryl groups may contain a monocyclic aryl group, a polycyclic aryl group, or a monocyclic aryl group and a polycyclic aryl group at the same time.

In the present specification, the heterocyclic group is a heterocyclic group and is a heterocyclic group containing at least one of O, N, S, Se and Si, and the number of carbon atoms is not particularly limited, but is preferably 2 to 60 carbon atoms. Examples of the heterocyclic group include a thiophene group, a furane group, a furyl group, an imidazole group, a thiazole group, an oxazole group, an oxadiazole group, a triazole group, a pyridyl group, a bipyridyl group, a pyrimidyl group, A pyridazinyl group, a pyrazinopyrazinyl group, an isoquinoline group, a pyrazinyl group, a pyrazinyl group, a pyrazinyl group, a pyrazinyl group, a quinolinyl group, a quinazolinyl group, a quinoxalinyl group, a phthalazinyl group, a pyridopyrimidinyl group, , An indole group, a carbazole group, a benzoxazole group, a benzoimidazole group, a benzothiazole group, a benzocarbazole group, a benzothiophene group, a dibenzothiophene group, a benzofuranyl group, a phenanthroline, An isoxazolyl group, an oxadiazolyl group, a thiadiazolyl group, a benzothiazolyl group, a phenothiazinyl group, and a dibenzofuranyl group, but is not limited thereto.

In the present specification, the aryl group in the aryloxy group, the arylthioxy group, the arylsulfoxy group and the aralkylamine group can be applied to the description of the aryl group described above. Specific examples of the aryloxy group include phenoxy, p-tolyloxy, m-tolyloxy, 3,5-dimethyl-phenoxy, 2,4,6-trimethylphenoxy, Naphthyloxy, 4-methyl-1-naphthyloxy, 5-methyl-2-naphthyloxy, 1-anthryloxy, 2-anthryl Phenanthryloxy, 9-phenanthryloxy and the like. Examples of the arylthioxy group include phenylthio group, 2-methylphenylthio group, 4-tert-butylphenyl And the like. Examples of the aryl sulfoxy group include a benzene sulfoxy group and a p-toluenesulfoxy group. However, the present invention is not limited thereto.

In the present specification, the alkyloxy group, the alkyl group in the alkylsulfoxy group, can be applied to the alkyl group described above. Specific examples of the alkyloxy group include a methylthio group, an ethylthio group, a tert-butylthio group, a hexylthio group and an octylthio group. Examples of the alkylsulfoxy group include a methylsulfoxy group, an ethylsulfoxy group, a propylsulfoxy group, But the present invention is not limited thereto.

As used herein, the term "adjacent" means that the substituent is a substituent substituted on an atom directly connected to the substituted atom, a substituent stereostructically closest to the substituent, or another substituent substituted on the substituted atom . For example, two substituents substituted at the ortho position in the benzene ring and two substituents substituted at the same carbon in the aliphatic ring may be interpreted as "adjacent" groups to each other.

In one embodiment of the present specification, adjacent groups are bonded to each other to form an aliphatic, aromatic, aliphatic hetero or aromatic heterocyclic ring, wherein each neighboring substituent forms a bond to form a 5- to 7-membered aliphatic ring, Means a 5- to 7-membered aromatic ring, a 5-to 7-membered aliphatic heterocyclic ring and a heteroatom to form a 5- to 7-membered aromatic heterocyclic ring.

In the present specification, the aliphatic ring, aromatic ring, aliphatic heterocyclic ring and aromatic heterocyclic ring may be monocyclic or polycyclic.

In the present specification, an arylene group means a group having two bonding positions in an aryl group, that is, a divalent group. The description of the aryl group described above can be applied, except that these are two groups each.

In one embodiment of the present specification, L2 is connected to the 4-position of the carbazole group and the 1-position of the fluorenyl group.

In one embodiment of the present specification, L2 is connected to the 4-position of the carbazole group and the 2-position of the fluorenyl group.

In one embodiment of the present specification, L2 is connected to the 4-position of the carbazole group and the 3-position of the fluorenyl group.

In one embodiment of the present specification, L2 is connected to the 4-position of the carbazole group and the 4-position of the fluorenyl group.

In one embodiment of the present invention, the compound represented by the formula (1) is represented by any one of the following formulas (1-1) to (1-4).

 [Formula 1-1]

[Formula 1-2]

[Formula 1-3]

[Formula 1-4]

In Formulas 1-1 to 1-4,

c, L 1, L 2, n, R "and R 1 to R 4 are the same as defined above.

In one embodiment of the present disclosure, L1 is a direct bond; Or a substituted or unsubstituted arylene group.

In one embodiment of the present disclosure, L1 is a direct bond; Or a substituted or unsubstituted arylene group having 6 to 20 carbon atoms.

In one embodiment of the present disclosure, L1 is a direct bond; Or a substituted or unsubstituted arylene group having 1 to 3 rings.

In one embodiment of the present disclosure, L1 is a direct bond; Or a substituted or unsubstituted arylene group having 1 or 2 rings.

In one embodiment of the present specification, L1 is a substituted or unsubstituted arylene group.

In one embodiment of the present disclosure, L1 is a direct bond; Or a substituted or unsubstituted phenylene group.

In one embodiment of the present invention, L1 is a substituted or unsubstituted phenylene group.

In one embodiment of the present disclosure, L1 is a direct bond; Or a phenylene group.

In one embodiment of the present invention, L1 is a phenylene group.

In one embodiment of the present disclosure, L1 is a direct bond.

In one embodiment of the present disclosure, L2 is a direct bond; Or a substituted or unsubstituted arylene group.

In one embodiment of the specification, L2 is a direct bond; Or a substituted or unsubstituted arylene group having 6 to 20 carbon atoms.

In one embodiment of the present disclosure, L2 is a direct bond; Or a substituted or unsubstituted arylene group having 1 to 3 rings.

In one embodiment of the present disclosure, L2 is a direct bond; Or a substituted or unsubstituted arylene group having 1 or 2 rings.

In one embodiment of the present specification, L2 is a substituted or unsubstituted arylene group.

In one embodiment of the present disclosure, L2 is a direct bond; Or a substituted or unsubstituted phenylene group.

In one embodiment of the present specification, L2 is a substituted or unsubstituted phenylene group.

In one embodiment of the present disclosure, L2 is a direct bond; Or a phenylene group.

In one embodiment of the present invention, L2 is a phenylene group.

In one embodiment of the present specification, L2 is a direct bond.

In one embodiment of the present disclosure, L1 is a direct bond; Or a substituted or unsubstituted arylene group, and L2 is a direct bond.

In one embodiment of the present disclosure, L1 is a direct bond; Or a substituted or unsubstituted phenylene group, and L2 is a direct bond.

In one embodiment of the present specification, R 2 and R 3 are the same or different and each independently represents a substituted or unsubstituted alkyl group; Or a substituted or unsubstituted aryl group, or combine with each other to form an aliphatic or aromatic ring.

In one embodiment of the present invention, R 2 and R 3 are the same or different and are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms; Or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, or are bonded to each other to form an aliphatic or aromatic ring.

In one embodiment of the present invention, R 2 and R 3 are the same or different and are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms; Or a substituted or unsubstituted phenyl group, or combine with each other to form an aliphatic or aromatic ring.

 In one embodiment of the present invention, R 2 and R 3 are the same or different and are each independently a substituted or unsubstituted alkyl group.

In one embodiment of the present invention, R 2 and R 3 are the same or different and are each independently a substituted or unsubstituted aryl group.

In one embodiment of the present specification, R 2 and R 3 are bonded to each other to form an aliphatic or aromatic ring.

In one embodiment of the present invention, R10 to R13 are the same or different and each independently represents a substituted or unsubstituted aryl group.

In one embodiment of the present invention, R10 to R13 are the same or different and each independently a substituted or unsubstituted aryl group having 6 to 30 carbon atoms.

In one embodiment of the present invention, R10 to R13 are the same or different and are each independently a substituted or unsubstituted aryl group having 6 to 20 carbon atoms.

In one embodiment of the present invention, R10 to R13 are the same or different from each other, and each independently is a substituted or unsubstituted aryl group having 1 to 3 rings.

In one embodiment of the present invention, R10 to R13 are the same or different from each other, and each independently is a monocyclic or bicyclic substituted or unsubstituted aryl group.

In one embodiment of the present specification, R10 to R13 are the same or different and are each independently a substituted or unsubstituted phenyl group; A substituted or unsubstituted biphenyl group; A substituted or unsubstituted terphenyl group; A substituted or unsubstituted stilbenyl group; A substituted or unsubstituted naphthyl group; A substituted or unsubstituted anthryl group; A substituted or unsubstituted phenanthryl group; A substituted or unsubstituted pyrenyl group; A substituted or unsubstituted perylenyl group; A substituted or unsubstituted chlorenyl group or a substituted or unsubstituted fluorenyl group.

In one embodiment of the present invention, R10 to R13 are the same or different from each other and each independently represents a phenyl group, a biphenyl group, a terphenyl group, a stilbenyl group, a naphthyl group, an anthryl group, a phenanthryl group, A perylenyl group, a crycenyl group or a fluorenyl group.

In one embodiment of the present specification, R10 to R13 are the same or different and are each independently a substituted or unsubstituted phenyl group; Or a substituted or unsubstituted biphenyl group.

및

에서 선택된 어느 하나이고, 상기 R10 내지 R12는 서로 동일하거나 상이하고, 각각 독립적으로 치환 또는 비치환된 아릴기이다.In one embodiment of the present disclosure, R4 is

And

, And R10 to R12 are the same or different and are each independently a substituted or unsubstituted aryl group.

이다. In one embodiment of the present disclosure, R4 is

to be.

이고, 상기 R10 및 R11은 서로 동일하거나 상이하고, 각각 독립적으로 치환 또는 비치환된 아릴기이다. In one embodiment of the present disclosure, R4 is

, And R10 and R11 are the same or different and are each independently a substituted or unsubstituted aryl group.

이고, 상기 R10 및 R11은 페닐기이다. In one embodiment of the present disclosure, R4 is

And R10 and R11 are phenyl groups.

In one embodiment of the present invention, the carbazole derivative represented by Formula 1 is any one of the following formulas.

The compound of formula (1) may be prepared based on the preparation examples described below. According to one embodiment of the present invention, it can be prepared in the following manner.

[Reaction Scheme 1]

In the above Reaction Scheme 1, the definition of substituents is as defined in the above formula (1), introducing a fluorenyl group into the carbazol group through Suzuki reaction, and reacting R4 with a Buchwald-Hartwig reaction Respectively.

In one embodiment of the present disclosure, the first electrode; A second electrode facing the first electrode; And an organic layer formed of one or more layers including a light emitting layer provided between the first electrode and the second electrode,

And at least one of the organic material layers includes the carbazole derivative.

In one embodiment of the present invention, the organic material layer includes a hole injection layer, a hole transport layer or hole injection and hole transport at the same time, and the layer including the hole injection layer, the hole transport layer, Sol derivatives.

In one embodiment of the present invention, the organic material layer includes an electron transporting layer, an electron injection layer, or a layer that simultaneously performs electron transport and electron injection, and the electron transport layer, the electron injection layer, And a carbazole derivative.

In one embodiment of the present invention, the light emitting layer includes the carbazole derivative.

In one embodiment of the present invention, the light emitting layer contains the carbazole derivative as a host and a phosphorescent dopant compound as a dopant.

When the heterocyclic compound according to one embodiment of the present invention is used as a host, the hole and / or electron mobility is improved as a bipolar host, thereby providing a high voltage, high efficiency and / or long life organic light emitting device.

The organic material layer of the organic light emitting device of the present invention may have a single layer structure, but may have a multilayer structure in which two or more organic material layers are stacked. For example, the organic light emitting device in this specification may have a structure including a hole injecting layer, a hole transporting layer, a light emitting layer, an electron transporting layer, an electron injecting layer, etc. as an organic material layer. However, the structure of the organic light emitting device is not limited thereto and may include a smaller number of organic layers.

In another embodiment, the organic light emitting device may be a normal type organic light emitting device in which an anode, at least one organic layer, and a cathode are sequentially stacked on a substrate.

 In another embodiment, the organic light emitting device may be an inverted type organic light emitting device in which a cathode, at least one organic compound layer, and an anode are sequentially stacked on a substrate.

In one embodiment of the present disclosure, the first electrode; A second electrode facing the first electrode; And a light emitting layer provided between the first electrode and the second electrode; Wherein at least one of the two or more organic layers includes the carbazole derivative. 2. The organic electroluminescent device according to claim 1, wherein the organic layer comprises a carbazole derivative. In one embodiment, the two or more organic layers may be selected from the group consisting of an electron transporting layer, an electron injecting layer, a layer that simultaneously transports electrons and an electron injecting layer, and a hole blocking layer.

In one embodiment of the present invention, the organic material layer includes two or more electron transporting layers, and at least one of the two or more electron transporting layers includes the carbazole derivative. Specifically, in one embodiment of the present specification, the carbazole derivative may be contained in one of the two or more electron transporting layers, and may be included in each of two or more electron transporting layers.

In one embodiment of the present invention, when the carbazole derivative is included in each of the two or more electron transporting layers, the materials other than the carbazole derivative may be the same or different from each other.

For example, the structure of the organic light emitting device according to the present invention is illustrated in FIGS.

1 shows an organic light emitting device in which an anode 2, a hole injecting layer 3, a hole transporting layer 4, a light emitting layer 5, an electron transporting layer 6 and a cathode 7 are sequentially stacked on a substrate 1 Structure is illustrated. In such a structure, the compound represented by Formula 1 may be included in the hole injecting layer 3, the hole transporting layer 4, the light emitting layer 5, or the electron transporting layer 6.

2 illustrates a structure of an organic light emitting device in which an anode 2, a hole injecting layer 3, a hole transporting layer 4, a light emitting layer 5, and a cathode 7 are sequentially laminated on a substrate 1. In this structure, the compound represented by Formula 1 may be included in the hole injection layer 3, the hole transport layer 4, or the light emitting layer 5.

3 illustrates a structure of an organic light emitting device in which an anode 2, a hole transporting layer 4, a light emitting layer 5, an electron transporting layer 6, and a cathode 7 are sequentially laminated on a substrate 1. In such a structure, the compound represented by Formula 1 may be included in the hole transport layer 4, the light emitting layer 5, or the electron transport layer 6.

4 shows a structure of an organic light emitting device in which an anode 2, a light emitting layer 5, an electron transport layer 6 and a cathode 7 are sequentially laminated on a substrate 1. [ In such a structure, the compound represented by Formula 1 may be included in the light-emitting layer 5 or the electron-transporting layer 6.

5 illustrates a structure of an organic light emitting device in which an anode 2, a light emitting layer 5, and a cathode 7 are sequentially laminated on a substrate 1. [ In such a structure, the compound represented by Formula 1 may be included in the light emitting layer 5.

The organic light emitting device of the present invention can be manufactured by materials and methods known in the art, except that one or more of the organic layers includes the compound of the present invention, i.e., the carbazole derivative.

For example, the organic light emitting device of the present invention can be manufactured by sequentially laminating a first electrode, an organic material layer, and a second electrode on a substrate. At this time, by using a PVD (physical vapor deposition) method such as a sputtering method or an e-beam evaporation method, a metal or a metal oxide having conductivity or an alloy thereof is deposited on the substrate to form a positive electrode Forming an organic material layer including a hole injecting layer, a hole transporting layer, a light emitting layer and an electron transporting layer thereon, and depositing a material usable as a cathode thereon. In addition to such a method, an organic light emitting device can be formed by sequentially depositing a cathode material, an organic material layer, and a cathode material on a substrate.

In addition, the carbazole derivative may be formed into an organic material layer by a solution coating method as well as a vacuum evaporation method in the production of an organic light emitting device. Here, the solution coating method refers to spin coating, dip coating, doctor blading, inkjet printing, screen printing, spraying, roll coating and the like, but is not limited thereto.

In one embodiment of the present invention, the first electrode is a cathode and the second electrode is a cathode.

In one embodiment of the present invention, the first electrode is an anode and the second electrode is a cathode.

The substrate can be selected in consideration of optical properties and physical properties as required. For example, the substrate is preferably transparent. The substrate may be of a rigid material, but may also be of a flexible material such as plastic.

In addition to glass and quartz, the material of the substrate may be selected from the group consisting of polyethyleneterephthalate (PET), polyethylene naphthalate (PEN), polypropylene (PP), polyimide (PI), polycarbonate (PC), polystyrene (PS), polyoxymethylene (acrylonitrile butadiene styrene copolymer), TAC (triacetyl cellulose) and PAR (polyarylate), but are not limited thereto.

The negative electrode material is preferably a material having a small work function to facilitate electron injection into the organic material layer. Specific examples of the negative electrode material include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin and lead or alloys thereof; Layer structure materials such as LiF / Al or LiO ₂ / Al, but are not limited thereto.

As the anode material, a material having a large work function is preferably used so that hole injection can be smoothly conducted into the organic material layer. Specific examples of the cathode material that can be used in the present invention include metals such as vanadium, chromium, copper, zinc, and gold, or alloys thereof; Metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO), and indium zinc oxide (IZO); ZnO: Al or SNO _2: a combination of a metal and an oxide such as Sb; Conductive polymers such as poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene] (PEDOT), polypyrrole and polyaniline.

The hole transport layer is a layer that transports holes from the hole injection layer to the light emitting layer. The hole transport material is a material capable of transporting holes from the anode or the hole injection layer to the light emitting layer. The material is suitable. Specific examples include arylamine-based organic materials, conductive polymers, and block copolymers having a conjugated portion and a non-conjugated portion together, but are not limited thereto.

The hole injecting layer is a layer for injecting holes from an electrode. The hole injecting material has a hole injecting effect, and has a hole injecting effect on the light emitting layer or a light emitting material. A compound which prevents the migration of excitons to the electron injecting layer or the electron injecting material and is also excellent in the thin film forming ability is preferable. The hole injecting material preferably has a highest occupied molecular orbital (HOMO) between the work function of the cathode material and the HOMO of the surrounding organic layer. Specific examples of the hole injecting material include metal porphyrin, oligothiophene, arylamine-based organic material, phthalocyanine derivative, hexanitrile hexaazatriphenylene-based organic material, quinacridone-based organic material, Perylene-based organic materials, anthraquinone, polyaniline and polythiophene-based conductive polymers, but are not limited thereto.

The light emitting material is preferably a material capable of emitting light in the visible light region by transporting and receiving holes and electrons from the hole transporting layer and the electron transporting layer, respectively, and having good quantum efficiency for fluorescence or phosphorescence. Specific examples include 8-hydroxy-quinoline aluminum complex (Alq ₃ ); Carbazole-based compounds; Dimerized styryl compounds; BAlq; 10-hydroxybenzoquinoline-metal compounds; Compounds of the benzoxazole, benzothiazole and benzimidazole series; Polymers of poly (p-phenylenevinylene) (PPV) series; Spiro compounds; Polyfluorene, rubrene, and the like, but are not limited thereto.

The light emitting material is preferably a material capable of emitting light in the visible light region by transporting and receiving holes and electrons from the hole transporting layer and the electron transporting layer, respectively, and having good quantum efficiency for fluorescence or phosphorescence. Specific examples include 8-hydroxy-quinoline aluminum complex (Alq ₃ ); Carbazole-based compounds; Dimerized styryl compounds; BAlq; 10-hydroxybenzoquinoline-metal compounds; Compounds of the benzoxazole, benzothiazole and benzimidazole series; Polymers of poly (p-phenylenevinylene) (PPV) series; Spiro compounds; Polyfluorene, rubrene, and the like, but are not limited thereto.

The light emitting layer may include a host material and a dopant material. The host material is a condensed aromatic ring derivative or a heterocyclic compound. Specific examples of the condensed aromatic ring derivatives include anthracene derivatives, pyrene derivatives, naphthalene derivatives, pentacene derivatives, phenanthrene compounds, and fluoranthene compounds. Examples of the heterocycle-containing compounds include carbazole derivatives, dibenzofuran derivatives, Furan compounds, pyrimidine derivatives, and the like, but are not limited thereto.

Examples of the dopant material include aromatic amine derivatives, styrylamine compounds, boron complexes, fluoranthene compounds, and metal complexes. Specific examples of the aromatic amine derivatives include condensed aromatic ring derivatives having substituted or unsubstituted arylamino groups, and examples thereof include pyrene, anthracene, chrysene, and peripherrhene having an arylamino group. Examples of the styrylamine compound include substituted or unsubstituted Wherein at least one aryl vinyl group is substituted with at least one aryl vinyl group, and at least one substituent selected from the group consisting of an aryl group, a silyl group, an alkyl group, a cycloalkyl group and an arylamino group is substituted or unsubstituted. Specific examples thereof include, but are not limited to, styrylamine, styryldiamine, styryltriamine, styryltetraamine, and the like. Examples of the metal complex include iridium complex, platinum complex, and the like, but are not limited thereto.

The electron transporting layer is a layer that receives electrons from the electron injecting layer and transports electrons to the light emitting layer. The electron transporting material is a material capable of transferring electrons from the cathode well to the light emitting layer. Do. Specific examples include an Al complex of 8-hydroxyquinoline; Complexes containing Alq ₃ ; Organic radical compounds; Hydroxyflavone-metal complexes, and the like, but are not limited thereto. The electron transporting layer can be used with any desired cathode material as used according to the prior art. In particular, an example of a suitable cathode material is a conventional material having a low work function followed by an aluminum layer or a silver layer. Specifically cesium, barium, calcium, ytterbium and samarium, in each case followed by an aluminum layer or a silver layer.

The electron injection layer is a layer for injecting electrons from the electrode. The electron injection layer has the ability to transport electrons, has an electron injection effect from the cathode, and has an excellent electron injection effect with respect to the light emitting layer or the light emitting material. A compound which prevents migration to a layer and is excellent in a thin film forming ability is preferable. Specific examples thereof include fluorenone, anthraquinodimethane, diphenoquinone, thiopyran dioxide, oxazole, oxadiazole, triazole, imidazole, perylene tetracarboxylic acid, preorenylidene methane, A complex compound and a nitrogen-containing five-membered ring derivative, but are not limited thereto.

Examples of the metal complex compound include 8-hydroxyquinolinato lithium, bis (8-hydroxyquinolinato) zinc, bis (8-hydroxyquinolinato) copper, bis (8- Tris (8-hydroxyquinolinato) aluminum, tris (2-methyl-8-hydroxyquinolinato) aluminum, tris (8- hydroxyquinolinato) gallium, bis (10- Quinolinato) beryllium, bis (10-hydroxybenzo [h] quinolinato) zinc, bis (2-methyl-8- quinolinato) chlorogallium, bis (2-methyl-8-quinolinato) (2-naphtholato) gallium, and the like, But is not limited thereto.

In one embodiment of the present invention, the organic light emitting diode may be a front emission type, a back emission type, or a both-sided emission type, depending on the material used.

The preparation of the carbazole derivative represented by the above formula (1) and the organic light emitting device including the same will be described in detail in the following examples. However, the following examples are intended to illustrate the present specification, and the scope of the present specification is not limited thereto.

< Manufacturing example >

<Preparation Example 1> Preparation of compound P1

4-Bromocarbazole (10.0 g, 40.6 mmol), 9,9-dimethyl-9H-fluorene-2-boronic acid (10.0 g, 42.0 mmol) and potassium carbonate (17.0 g, 123 mmol) were dissolved in tetrahydrofuran (100 mL) and water (50 mL). After nitrogen charging, tetrakis (triphenylphosphine) palladium (0.9 g, 0.7 mmol) was added to the suspension. Under nitrogen, the mixture was stirred at reflux for about 12 hours. After cooling to room temperature, the organic layer was separated and removed under reduced pressure. The pale yellow solid was purified by using THF / EtOH to obtain white solid P1 (13 g, 90%).

MS [M + H]: 360 &lt; RTI ID = 0.0 &

<Preparation Example 2> Preparation of compound P2

Boronic acid (15.0 g, 41.4 mmol) and potassium carbonate (17.0 g, 123 mmol) were dissolved in tetrahydrofuran (10.0 g, Was suspended in a mixture of furan (100 mL) and water (50 mL). After nitrogen charging, tetrakis (triphenylphosphine) palladium (0.9 g, 0.7 mmol) was added to the suspension. Under nitrogen, the mixture was stirred at reflux for about 12 hours. After cooling to room temperature, the organic layer was separated and removed under reduced pressure. The pale yellow solid was purified by using THF / EtOH to obtain white solid P2 (12 g, 61%).

MS [M + H] &lt; + &gt;: 484

<Preparation Example 3> Preparation of compound P3

(15.0 g, 41.4 mmol) and potassium carbonate (17.3 g, 123 mmol) were added to a solution of tetra (4-chlorophenyl) Was suspended in a mixture of hydrofuran (100 mL) and water (50 mL). After nitrogen charging, tetrakis (triphenylphosphine) palladium (0.9 g, 0.7 mmol) was added to the suspension. Under nitrogen, the mixture was stirred at reflux for about 12 hours. After cooling to room temperature, the organic layer was separated and removed under reduced pressure. The pale yellow solid was purified using THF / EtOH to give white solid P3 (14 g, 70%).

MS [M + H] &lt; + &gt;: 484

<Preparation Example 4> Preparation of Compound 1-7

A mixture of compound P1 (8.2 g, 22.8 mmol), 2- (4-chlorophenyl) -4,6-diphenyl-1,3,5-triazine (8.5 g, 24.7 mmol), bis (tert- Palladium (0.1 g, 0.2 mmol) and sodium tertiary-butoxide (2.8 g, 29.1 mmol) were mixed and refluxed under nitrogen in xylene (50 ml) for 6 hours with stirring. After the temperature was lowered to room temperature, the solvent was removed under reduced pressure. The pale yellow solid was dissolved in chloroform, and magnesium sulfate and acidic white clay were added thereto, followed by stirring, followed by filtration and distillation under reduced pressure. Recrystallization was performed using chloroform and ethyl acetate to obtain a white solid compound 1-7 (9.1 g, 59%).

MS [M + H] &lt; / RTI &gt;: 667

<Preparation Example 5> Preparation of Formula 1-8

Using the compound P1 (8.2 g, 22.8 mmol) and 2- (3-chlorophenyl) -4,6-diphenyl-1,3,5-triazine (8.5 g, 24.7 mmol) Thereby obtaining a white solid compound 1-8 (8.7 g, 57%).

MS [M + H] &lt; / RTI &gt;: 667

<Production Example 6> Preparation of Formula 1-17

Using the compound P3 (10.0 g, 20.6 mmol) and 2- (4-chlorophenyl) -4,6-diphenyl-1,3,5-triazine (7.1 g, 20.6 mmol) (10.7 g, 65%) as a white solid compound.

MS [M + H] &lt; + &gt;: 791

<Production Example 7> Preparation of Formula 1-19

Using the compound P2 (9.0 g, 18.6 mmol) and 2- (4-chlorophenyl) -4,6-diphenyl-1,3,5-triazine (6.5 g, 18.9 mmol) To thereby obtain a white solid compound (1-19) (9.7 g, 65%).

MS [M + H] &lt; + &gt;: 791

<Preparation Example 8> Preparation of Formula 1-20

Following the procedure of Preparation 4, using compound P2 (9.0 g, 18.6 mmol) and 4- (4-chlorophenyl) -2,6-diphenylpyrimidine (6.6 g, 19.2 mmol) 1-20 (10.7 g, 72%).

MS [M + H] &lt; / RTI &gt;: 790

< Experimental Example  1>

The glass substrate coated with ITO (indium tin oxide) film with a thickness of 1,500 Å was immersed in distilled water containing detergent and washed with ultrasonic waves. At this time, a Fischer Co. product was used as a detergent, and distilled water, which was filtered with a filter of Millipore Co., was used as distilled water. The ITO was washed for 30 minutes and then washed twice with distilled water and ultrasonically cleaned for 10 minutes. After the distilled water was washed, it was ultrasonically washed with a solvent of isopropyl alcohol, acetone, and methanol, dried, and then transported to a plasma cleaner. Further, the substrate was cleaned using oxygen plasma for 5 minutes, and then the substrate was transported by a vacuum evaporator. Hexanitrile hexaazatriphenylene (HAT) of the following chemical formula was thermally vacuum deposited on the prepared ITO transparent electrode to a thickness of 500 Å to form a hole injection layer.

[ HAT ]

N, N-Bis- (1-naphthalenyl) -N, Nbis-phenyl- (1,1-biphenyl) -4,4-diamine compound of the following structure was deposited on the hole injection layer to a thickness of 400 Å, To form a hole transporting layer.

Next, on the hole transport layer, a compound of the formula 1-8 prepared in Preparation Example above was vacuum deposited at a concentration of 10% with Ir (ppy) ₃ dopant to form a light emitting layer.

The following electron transport material was vacuum deposited on the light emitting layer to a thickness of 200 Å to form an electron injection and transport layer.

[Electron transport material]

Lithium fluoride (LiF) and aluminum were deposited to a thickness of 12 Å on the electron injection and transport layer sequentially to form a cathode. The deposition rate of the organic material was maintained at 0.4 to 0.7 Å / sec, the lithium fluoride at the cathode was maintained at a deposition rate of 0.3 Å / sec, and the deposition rate of aluminum was maintained at 2 Å / sec. ^-7 to 5 x 10 &lt; ^-8 &gt; torr.

< Experimental Example  2>

In the same manner as in Experimental Example 1, except that the compound of Formula 1-17 was used instead of the compound of Formula 1-8.

< Experimental Example  3>

In the same manner as in Experimental Example 1, except that the compound of Formula 1-19 was used instead of the compound of Formula 1-8.

< Experimental Example 4>

In the same manner as in Experimental Example 1, except that the compound of Formula 1-20 was used in place of the compound of Formula 1-8.

< Comparative Example  1>

In the same manner as in Experimental Example 1, except that the following H1 was used in place of the compound of Formula 1-8.

< Comparative Example  2>

In the same manner as in Experimental Example 1, except that the following H2 was used in place of the compound of Formula 1-8.

Table 1 shows the device results obtained by using the respective compounds in Experimental Examples 1 to 4 and Comparative Examples 1 and 2 as the light emitting layer.

[Table 1]

As can be seen from the above Table 1, Examples 1 to 4 show that the compounds of the present invention can be used as a host of a green light emitting layer and have improved efficiency and longer lifetime than Comparative Examples 1 and 2.

1: substrate
2: anode
3: Hole injection layer
4: hole transport layer
5: light emitting layer
6: electron transport layer
7: cathode

Claims (11)

A carbazole derivative represented by the following formula (1): &lt; EMI ID =
[Chemical Formula 1]

In formula (1)
L1 and L2 are the same or different from each other, and are each independently a direct bond; Or an arylene group,
R "is hydrogen or deuterium,
R1 to R4 are the same or different from each other, and each independently hydrogen; heavy hydrogen; An alkyl group; An aryl group; A fluorenyl group; Carbazole group; Benzocarbazole group; A triazine group substituted or unsubstituted with a deuterium or an aryl group; Or an aromatic or aliphatic heterocyclic group which is substituted or unsubstituted with a deuterium or an aryl group, or forms a spiro bond with an adjacent group,
n is an integer of 0 to 7,
c is an integer of 0 to 7,
When n is 2 or more, R "are the same or different from each other,
When c is 2 or more, R1 is the same or different from each other. A carbazole derivative according to claim 1, wherein R4 is any one of the following substituents:

R10 to R13 are the same or different from each other, and each independently hydrogen; heavy hydrogen; Or an aryl group. [2] The compound according to claim 1, wherein L1 is a direct bond; Or a phenylene group. 2. The compound according to claim 1, wherein L2 is a direct bond; Or a phenylene group. The carbazole derivative according to claim 1, wherein the carbazole derivative represented by the formula (1) is represented by any one of the following formulas (1-1) to (1-4)
[Formula 1-1]

[Formula 1-2]

[Formula 1-3]

[Formula 1-4]

In Formulas 1-1 to 1-4,
c, L 1, L 2, n, R "and R 1 to R 4 are the same as defined above. The carbazole derivative according to claim 1, wherein the carbazole derivative represented by the formula (1) is any one selected from the following formulas.

A first electrode; A second electrode facing the first electrode; And at least one organic layer including a light emitting layer provided between the first electrode and the second electrode,
Wherein at least one of the organic material layers comprises a carbazole derivative according to any one of claims 1 to 6. The method of claim 7,
Wherein the organic material layer includes an electron transporting layer, an electron injecting layer, or a layer simultaneously performing electron transport and electron injection,
Wherein the electron transport layer, the electron injection layer, or the layer which simultaneously transports electrons and electron injects includes the carbazole derivative. The method of claim 7,
Wherein the light emitting layer comprises the carbazole derivative. The method of claim 7,
Wherein the light emitting layer contains the carbazole derivative as a host and a phosphorescent dopant compound as a dopant. The method of claim 7,
Wherein the organic material layer includes a hole transporting layer, a hole injecting layer, or a layer simultaneously injecting holes and transporting holes,
Wherein the hole transporting layer, the hole injecting layer, or the layer simultaneously injecting the holes and transporting the hole include the carbazole derivative.

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