KR20210152296A - Novel compound and organic light emitting device comprising the same - Google Patents

Abstract

The present invention provides a novel compound and an organic light emitting device comprising the same. The present invention provides a compound represented by chemical formula 1. The compound represented by chemical formula 1 described above can be used as a material for an organic layer of the organic light emitting device, and can also be used in a solution process.

Description

Novel compound and organic light emitting device comprising the same

The present invention relates to a novel compound and an organic light emitting device comprising the same.

In general, the organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy using an organic material. The organic light emitting device using the organic light emitting phenomenon has a wide viewing angle, excellent contrast, fast response time, and excellent luminance, driving voltage, and response speed characteristics, and thus many studies are being conducted.

An organic light emitting device generally has a structure including an anode and a cathode and an organic material layer between the anode and the cathode. The organic material layer is often made of a multi-layer structure composed of different materials in order to increase the efficiency and stability of the organic light emitting device, for example, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, It may be made of an electron injection layer, etc. In the structure of the organic light emitting device, when a voltage is applied between the two electrodes, holes are injected into the organic material layer from the anode and electrons from the cathode are injected into the organic material layer. When the injected holes and electrons meet, excitons are formed, and the excitons It lights up when it falls back to the ground state.

The development of new materials for organic materials used in organic light emitting devices as described above is continuously required.

Meanwhile, in recent years, organic light emitting devices using a solution process, particularly an inkjet process, have been developed instead of the conventional deposition process in order to reduce process costs. In the early days, all organic light emitting device layers were coated with a solution process to develop an organic light emitting device, but the current technology has limitations, so only HIL, HTL, and EML are processed as a solution process, and the subsequent process is a hybrid that utilizes the existing deposition process. (hybrid) process is being studied.

Accordingly, the present invention provides a material for a novel organic light emitting device that can be used in an organic light emitting device and can be used in a solution process at the same time.

Korean Patent Publication No. 10-2000-0051826

The present invention relates to a novel organic light emitting material and an organic light emitting device comprising the same.

The present invention provides a compound represented by the following formula (1):

[Formula 1]

In Formula 1,

Ar ₁ and Ar ₂ are each independently, substituted or unsubstituted C _6-60 aryl; _{Or substituted or unsubstituted C 2-60} heteroaryl comprising any one or more selected from the group consisting of N, O and S,

L ₁ and L ₂ are each independently, a single bond; substituted or unsubstituted C _6-60 arylene; _{Or substituted or unsubstituted C 2-60} heteroarylene comprising any one or more selected from the group consisting of N, O and S,

R ₁ and R ₂ are each independently hydrogen; heavy hydrogen; substituted or unsubstituted C _1-60 alkyl; substituted or unsubstituted C _6-60 aryl; _{Or C 2-60} heteroaryl comprising at least one selected from the group consisting of substituted or unsubstituted N, O and S, or two adjacent R ₁ or two adjacent R ₂ are bonded to each other to C _{6- 60} aromatic rings; Or to form _{a C 2-60} heteroaromatic ring comprising any one or more selected from the group consisting of N, O and S,

a1 and a2 are each independently an integer of 0-4.

In addition, the present invention is a first electrode; a second electrode provided to face the first electrode; and at least one organic material layer provided between the first electrode and the second electrode, wherein at least one of the organic material layers includes the compound represented by Formula 1 above. .

The compound represented by Formula 1 described above can be used as a material for an organic material layer of an organic light emitting device, and can also be used in a solution process, and can improve efficiency, low driving voltage and/or lifespan characteristics in an organic light emitting device. have. In particular, the compound represented by Chemical Formula 1 described above may be used as a hole injection, hole transport, and light emitting material.

FIG. 1 shows an example of an organic light emitting device including a substrate 1 , an anode 2 , a light emitting layer 3 , and a cathode 4 .
2 shows an example of an organic light emitting device including a substrate 1, an anode 2, a hole injection layer 5, a hole transport layer 6, a light emitting layer 3, an electron transport layer 7, and a cathode 4 did it

Hereinafter, it will be described in more detail to help the understanding of the present invention.

The present invention provides a compound represented by Formula 1 above.

또는

는 다른 치환기에 연결되는 결합을 의미한다. In this specification,

or

means a bond connected to another substituent.

As used herein, the term "substituted or unsubstituted" refers to deuterium; halogen group; nitrile group; nitro group; hydroxyl group; carbonyl group; ester group; imid; amino group; a phosphine oxide group; alkoxy group; aryloxy group; alkyl thiooxy group; arylthioxy group; an alkyl sulfoxy group; arylsulfoxy group; silyl group; boron group; an alkyl group; cycloalkyl group; alkenyl group; aryl group; aralkyl group; aralkenyl group; an alkylaryl group; an alkylamine group; an aralkylamine group; heteroarylamine group; arylamine group; an arylphosphine group; arylsilyl group; Or N, O, and S atom means that it is substituted or unsubstituted with one or more substituents selected from the group consisting of a heterocyclic group containing one or more, or substituted or unsubstituted, two or more of the above-exemplified substituents are linked. . For example, "a substituent in 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, the number of carbon atoms in the carbonyl group is not particularly limited, but preferably 1 to 40 carbon atoms. Specifically, it may be a compound having the following structure, but is not limited thereto.

In the present specification, in the ester group, oxygen of the ester group may be substituted with a linear, branched 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 number of carbon atoms of the imide group is not particularly limited, but it is preferably from 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 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, a phenylsilyl group, and the like. However, the present invention is not limited thereto.

In the present specification, the boron group specifically includes, but is not limited to, a trimethylboron group, a triethylboron group, a t-butyldimethylboron group, a triphenylboron group, a phenylboron group, and the like.

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

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 40. According to an exemplary embodiment, the number of carbon atoms in the alkyl group is 1 to 20. According to another exemplary embodiment, the number of carbon atoms in the alkyl group is 1 to 10. According to another exemplary embodiment, the alkyl group has 1 to 6 carbon atoms. Specific examples of the alkyl group include methyl, ethyl, propyl, n-propyl, isopropyl, butyl, n-butyl, isobutyl, tert-butyl, sec-butyl, 1-methyl-butyl, 1-ethyl-butyl, pentyl, n -pentyl, isopentyl, neopentyl, tert-pentyl, hexyl, n-hexyl, 1-methylpentyl, 2-methylpentyl, 4-methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, heptyl , n-heptyl, 1-methylhexyl, cyclopentylmethyl, cyclohexylmethyl, octyl, n-octyl, tert-octyl, 1-methylheptyl, 2-ethylhexyl, 2-propylpentyl, n-nonyl, 2,2 -Dimethylheptyl, 1-ethyl-propyl, 1,1-dimethyl-propyl, isohexyl, 2-methylpentyl, 4-methylhexyl, 5-methylhexyl and the like, but are not limited thereto.

In the present specification, the alkenyl group may be linear or branched, and the number of carbon atoms is not particularly limited, but is preferably 2 to 40. According to an exemplary embodiment, the carbon number of the alkenyl group is 2 to 20. According to another exemplary embodiment, the carbon number of the alkenyl group is 2 to 10. According to another exemplary embodiment, the alkenyl group has 2 to 6 carbon atoms. Specific examples include vinyl, 1-propenyl, isopropenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 3-methyl-1- Butenyl, 1,3-butadienyl, allyl, 1-phenylvinyl-1-yl, 2-phenylvinyl-1-yl, 2,2-diphenylvinyl-1-yl, 2-phenyl-2-( Naphthyl-1-yl)vinyl-1-yl, 2,2-bis(diphenyl-1-yl)vinyl-1-yl, stilbenyl group, styrenyl group, and the like, but are not limited thereto.

In the present specification, the cycloalkyl group is not particularly limited, but preferably has 3 to 60 carbon atoms, and according to an exemplary embodiment, the cycloalkyl group has 3 to 30 carbon atoms. According to another exemplary embodiment, the carbon number of the cycloalkyl group is 3 to 20. According to another exemplary embodiment, the cycloalkyl group has 3 to 6 carbon atoms. Specifically, cyclopropyl, cyclobutyl, cyclopentyl, 3-methylcyclopentyl, 2,3-dimethylcyclopentyl, cyclohexyl, 3-methylcyclohexyl, 4-methylcyclohexyl, 2,3-dimethylcyclohexyl, 3, 4,5-trimethylcyclohexyl, 4-tert-butylcyclohexyl, cycloheptyl, cyclooctyl, and the like, but is not limited thereto.

In the present specification, the aryl group is not particularly limited, but preferably has 6 to 60 carbon atoms, and may be a monocyclic aryl group or a polycyclic aryl group. According to an exemplary embodiment, the carbon number of the aryl group is 6 to 30. According to an exemplary embodiment, the carbon number of the aryl group is 6 to 20. The aryl group may be a monocyclic aryl group, such as a phenyl group, a biphenyl group, or a terphenyl group, but is not limited thereto. The polycyclic aryl group may be a naphthyl group, an anthracenyl group, a phenanthryl group, a pyrenyl group, a perylenyl group, a chrysenyl group, a fluorenyl group, and the like, but is not limited thereto.

등이 될 수 있다. 다만, 이에 한정되는 것은 아니다.In the present specification, the fluorenyl group may be substituted, and two substituents may be bonded to each other to form a spiro structure. When the fluorenyl group is substituted,

etc. can be However, the present invention is not limited thereto.

In the present specification, the heterocyclic group is a heterocyclic group including at least one of O, N, Si and S as a heterogeneous element, and the number of carbon atoms is not particularly limited, but it is preferably from 2 to 60 carbon atoms. Examples of the heterocyclic group include a thiophene group, a furan group, a pyrrole 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 triazine group, an acridyl group , pyridazine group, pyrazinyl group, quinolinyl group, quinazoline group, quinoxalinyl group, phthalazinyl group, pyrido pyrimidinyl group, pyrido pyrazinyl group, pyrazino pyrazinyl group, isoquinoline group, indole group , carbazole group, benzoxazole group, benzoimidazole group, benzothiazole group, benzocarbazole group, benzothiophene group, dibenzothiophene group, benzofuranyl group, phenanthroline group, isoxazolyl group, thiadia and a jolyl group, a phenothiazinyl group, and a dibenzofuranyl group, but is not limited thereto.

In the present specification, the aryl group in the aralkyl group, the aralkenyl group, the alkylaryl group, and the arylamine group is the same as the examples of the aryl group described above. In the present specification, the alkyl group among the aralkyl group, the alkylaryl group, and the alkylamine group is the same as the example of the above-described alkyl group. In the present specification, the description of the heterocyclic group described above for heteroaryl among heteroarylamines may be applied. In the present specification, the alkenyl group among the aralkenyl groups is the same as the above-described examples of the alkenyl group. In the present specification, the description of the above-described aryl group may be applied, except that arylene is a divalent group. In the present specification, the description of the above-described heterocyclic group may be applied, except that heteroarylene is a divalent group. In the present specification, the hydrocarbon ring is not a monovalent group, and the description of the above-described aryl group or cycloalkyl group may be applied, except that it is formed by combining two substituents. In the present specification, the heterocyclic group is not a monovalent group, and the description of the above-described heterocyclic group may be applied, except that it is formed by combining two substituents.

compound

The compound of the present invention is represented by the above formula (1).

Preferably, the compound represented by Formula 1 may be represented by any one of Formulas 1-1 to 1-4 below:

[Formula 1-1]

[Formula 1-2]

[Formula 1-3]

[Formula 1-1]

In Formulas 1-1 to 1-4,

Ar ₁ , Ar ₂ , L ₁ , L ₂ , R ₁ and R ₂ are as defined in Formula 1 above.

Preferably, Ar ₁ and Ar ₂ are each independently selected from substituted or unsubstituted C _6-20 aryl; Or it may be _{a C 2-20} heteroaryl comprising at least one selected from the group consisting of substituted or unsubstituted N, O and S.

More preferably, Ar ₁ and Ar ₂ are each independently phenyl, biphenylyl, naphthyl, dimethylfluorenyl, diphenylfluorenyl, dimethylbenzofluorenyl, benzofuranyl, dibenzofuranyl, pyridinyl, or carbazolyl, wherein Ar ₁ and Ar ₂ are each independently, unsubstituted, or deuterium, C _1-10 alkyl, tri(C _1-10 alkyl)silyl, tri(C _6-20 aryl) It may be substituted with 1 to 5 substituents selected from the group consisting of silyl, halogen and cyano.

More preferably, Ar ₁ and Ar ₂ are each independently phenyl, biphenylyl, naphthyl, dimethylfluorenyl, diphenylfluorenyl, dimethylbenzofluorenyl, benzofuranyl, dibenzofuranyl, pyridinyl, or carbazolyl, wherein Ar ₁ and Ar ₂ are each independently, unsubstituted, or deuterium, methyl, ethyl, butyl, isobutyl, tertbutyl, 2,4,4-trimethylpentan-2-yl , may be substituted with 1 to 5 substituents selected from the group consisting of trimethylsilyl, triphenylsilyl and fluoro.

Most preferably, Ar ₁ and Ar ₂ may each independently be any one selected from the group consisting of:

.

.

Preferably, L ₁ and L ₂ are each independently a single bond; substituted or unsubstituted C _6-20 arylene; Or it may be _{a C 2-20} heteroarylene comprising at least one selected from the group consisting of substituted or unsubstituted N, O and S.

More preferably, L ₁ and L ₂ may each independently be a single bond, phenylene, or naphthylene.

Preferably, R ₁ and R ₂ are each independently hydrogen; heavy hydrogen; substituted or unsubstituted C _1-10 alkyl; substituted or unsubstituted C _6-20 aryl; _{Or C 2-20} heteroaryl comprising at least one selected from the group consisting of substituted or unsubstituted N, O and S, or two adjacent R ₁ or two adjacent R ₂ are bonded to each other to C _{6- 20} aromatic rings; Or it may form _{a C 2-20} heteroaromatic ring including any one or more selected from the group consisting of N, O and S.

More preferably, R ₁ and R ₂ are each independently hydrogen, deuterium, methyl, propyl, isopropyl, butyl, tertbutyl, phenyl, phenyl substituted with one tertbutyl, biphenylyl, naphthyl, benzo It is furanyl, dibenzofuranyl, or carbazolyl, or two adjacent R ₁ or two adjacent R ₂ may be bonded to each other to form a benzene ring, a furan ring or a thiophene ring.

Preferably, a1 and a2 may each independently be an integer of 0 to 2.

Preferably, Ar ₁ and Ar ₂ may be the same as each other.

Preferably, L ₁ and L ₂ may be identical to each other.

Preferably, R ₁ and R ₂ may be identical to each other.

More preferably, Ar ₁ and Ar ₂ may be identical to each other, and L ₁ and L ₂ may be identical to each other.

More preferably, R ₁ and R ₂ may be identical to each other, and a1 and a2 may be identical to each other.

Most preferably, Ar ₁ and Ar ₂ may be identical to each other, L ₁ and L ₂ may be identical to each other, R ₁ and R ₂ may be identical to each other, and a1 and a2 may be identical to each other.

Representative examples of the compound represented by Formula 1 are as follows:

.

.

Meanwhile, in the compound represented by Formula 1, when Ar ₁ and Ar ₂ are the same as each other, L ₁ and L ₂ are the same as each other, R ₁ and R ₂ are the same as each other, and a1 and a2 are the same as each other, one example It can be prepared in the same way as in Scheme 1, and other compounds can be prepared similarly.

[Scheme 1]

In Scheme 1, step 1 is an amine substitution reaction, and it is preferably carried out in the presence of a palladium catalyst and a base, and the reactor for the amine substitution reaction can be changed as known in the art, and step 2 is performed by a Lewis acid It is a decomposition reaction of ether, and step 3 is a nucleophilic aromatic substitution reaction, and the reactive group, catalyst, solvent, etc. used in Scheme 1 can be suitably changed for a desired product. The manufacturing method may be more specific in Preparation Examples to be described later.

coating composition

The compound represented by Formula 1 according to the present invention may be included in the organic material layer of the organic light emitting device through a solution process. To this end, the present invention provides a coating composition comprising the compound represented by Formula 1 and a solvent according to the present invention described above.

The solvent is not particularly limited as long as it is a solvent capable of dissolving or dispersing the compound represented by Formula 1, and for example, chloroform, methylene chloride, 1,2-dichloroethane, 1,1,2-trichloroethane, chlorobenzene , chlorine-based solvents such as o-dichlorobenzene; ether solvents such as tetrahydrofuran and dioxane; aromatic hydrocarbon solvents such as toluene, xylene, trimethylbenzene, and mesitylene; aliphatic hydrocarbon solvents such as cyclohexane, methylcyclohexane, n-pentane, n-hexane, n-heptane, n-octane, n-nonane, and n-decane; Ketone solvents, such as acetone, methyl ethyl ketone, and cyclohexanone; ester solvents such as ethyl acetate, butyl acetate, and ethyl cellosolve acetate; Polyvalents such as ethylene glycol, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether, dimethoxyethane, propylene glycol, diethoxymethane, triethylene glycol monoethyl ether, glycerin, and 1,2-hexanediol alcohols and derivatives thereof; alcohol solvents such as methanol, ethanol, propanol, isopropanol and cyclohexanol; sulfoxide solvents such as dimethyl sulfoxide; and amide solvents such as N-methyl-2-pyrrolidone and N,N-dimethylformamide; benzoate solvents such as butylbenzoate and methyl-2-methoxybenzoate; tetralin; and solvents such as 3-phenoxy-toluene. In addition, the above-mentioned solvents may be used alone or as a mixture of two or more solvents.

In addition, each coating composition may further include one or two or more additives selected from the group consisting of a thermal polymerization initiator and a photopolymerization initiator.

As the thermal polymerization initiator, methyl ethyl ketone peroxide, methyl isobutyl ketone peroxide, acetylacetone peroxide, methylcyclohexanone peroxide, cyclohexanone peroxide, isobutyryl peroxide, 2,4-dichlorobenzoyl peroxide oxide, peroxides such as bis-3,5,5-trimethyl hexanoyl peroxide, lauryl peroxide, benzoyl peroxide, or azobis isobutylnitrile, azobisdimethylvaleronitrile, and azobiscyclohexyl nitrile azo family, but is not limited thereto.

As the photopolymerization initiator, diethoxy acetophenone, 2,2-dimethoxy-1,2-diphenyl ethan-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 4-(2-hydroxyethoxy ) Phenyl- (2-hydroxy-2-propyl) ketone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone-1,2-hydroxy-2-methyl-1- Phenyl propan-1-one, 2-methyl-2-morpholino (4-methyl thio phenyl) propan-1-one, 1-phenyl-1,2-propanedione-2- (o-ethoxycarbonyl) Acetophenone-type or ketal-type photoinitiators, such as an oxime; benzoin ether-based photopolymerization initiators such as benzoin, benzoin methyl ether, and benzoin ethyl ether; benzophenone-based photopolymerization initiators such as benzophenone, 4-hydroxybenzophenone, 2-benzoylnaphthalene, 4-benzoylbiphenyl, and 4-benzoylphenyl ether; thioxanthone-based photopolymerization initiators such as 2-isopropylthioxanthone, 2-chlorothioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethylthioxanthone, and 2,4-dichlorothioxanthone; and ethyl anthraquinone, 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, 2,4,6-trimethylbenzoyl phenyl ethoxy phosphine oxide, bis (2,4,6-trimethylbenzoyl) phenyl phosphine oxide, Other photopolymerization initiators such as, but not limited to, bis(2,4-dimethoxy benzoyl)-2,4,4-trimethyl pentylphosphine oxide.

Moreover, what has a photoinitiator effect can also be used individually or in combination with the said photoinitiator. For example, there are triethanolamine, methyldiethanolamine, 4-dimethylamino ethyl benzoate, 4-dimethylamino benzoate isoamyl, benzoate (2-dimethylamino) ethyl, 4,4'-dimethylaminobenzophenone, etc., but this not limited

In addition, the viscosity of the coating composition is preferably 1 cP to 10 cP, and coating is easy in the above range. In addition, the concentration of the polymer according to the present invention in the coating composition is preferably 0.1 wt/v% to 20 wt/v%.

In addition, the present invention provides a method of forming a light emitting layer using the above-described coating composition. Specifically, on the anode; on the hole injection layer formed on the anode; Or on the hole transport layer formed on the hole injection layer formed on the anode, coating the coating composition according to the present invention as described above in a solution process; and heat-treating or light-treating the coated coating composition.

The solution process uses the coating composition according to the present invention described above, and refers to spin coating, dip coating, doctor blading, inkjet printing, screen printing, spraying method, roll coating, and the like, but is not limited thereto.

The heat treatment temperature in the heat treatment step is preferably 150 to 230 ℃. In addition, the heat treatment time is 1 minute to 3 hours, more preferably 10 minutes to 1 hour. In addition, the heat treatment is preferably performed in an inert gas atmosphere such as argon or nitrogen. In addition, the step of evaporating the solvent may be further included between the coating step and the heat treatment or light treatment step.

organic light emitting device

In addition, the present invention provides an organic light emitting device comprising the compound represented by Formula 1 above. In one example, the present invention provides a first electrode; a second electrode provided to face the first electrode; and at least one organic material layer provided between the first electrode and the second electrode, wherein at least one layer of the organic material layer includes the compound represented by Formula 1 above. do.

The organic material layer of the organic light emitting device of the present invention may have a single-layer structure, but may have a multi-layer structure in which two or more organic material layers are stacked. For example, the organic light emitting device of the present invention may have a structure including a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection 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 addition, the organic layer may include an emission layer, and the emission layer may include a compound represented by Formula 1 above.

Also, the organic layer may include a hole transport layer or a hole injection layer, and the hole transport layer or the hole injection layer may include the compound represented by Formula 1 above.

In addition, the organic layer may include an electron transport layer, an electron injection layer, or a layer that simultaneously transports and injects electrons.

Also, the organic layer may include a light emitting layer or a hole transport layer, and the light emitting layer or the hole transport layer may include a compound represented by Formula 1 above.

In addition, the organic light emitting device according to the present invention may be a normal type organic light emitting device in which an anode, one or more organic material layers, and a cathode are sequentially stacked on a substrate. In addition, the organic light emitting device according to the present invention may be an inverted type organic light emitting device in which a cathode, one or more organic material layers, and an anode are sequentially stacked on a substrate. For example, the structure of the organic light emitting diode according to an embodiment of the present invention is illustrated in FIGS. 1 and 2 .

1 shows an example of an organic light emitting device including a substrate 1 , an anode 2 , a light emitting layer 3 , and a cathode 4 . In such a structure, the compound represented by Formula 1 may be included in the light emitting layer.

2 shows an example of an organic light emitting device including a substrate 1, an anode 2, a hole injection layer 5, a hole transport layer 6, a light emitting layer 3, an electron transport layer 7, and a cathode 4 did it In such a structure, the compound represented by Formula 1 may be included in at least one of the hole injection layer, the hole transport layer, and the light emitting layer.

The organic light emitting device according to the present invention may be manufactured using materials and methods known in the art, except that at least one layer of the organic material layer includes the compound represented by Formula 1 above. Also, when the organic light emitting device includes a plurality of organic material layers, the organic material layers may be formed of the same material or different materials.

For example, the organic light emitting diode according to the present invention may be manufactured by sequentially stacking 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 sputtering or e-beam evaporation, a metal or conductive metal oxide or an alloy thereof is deposited on a substrate to form an anode And, after forming an organic layer including a hole injection layer, a hole transport layer, a light emitting layer and an electron transport layer thereon, it can be prepared by depositing a material that can be used as a cathode thereon. In addition to this method, an organic light emitting device may be manufactured by sequentially depositing a cathode material, an organic material layer, and an anode material on a substrate.

In addition, the compound represented by Formula 1 may be formed into an organic material layer by a solution coating method as well as a vacuum deposition method when manufacturing an organic light emitting device. Here, the solution coating method refers to spin coating, dip coating, doctor blading, inkjet printing, screen printing, spray method, roll coating, and the like, but is not limited thereto.

In addition to this method, an organic light emitting device may be manufactured by sequentially depositing an organic material layer and an anode material from a cathode material on a substrate (WO 2003/012890). However, the manufacturing method is not limited thereto.

In one example, the first electrode is an anode, the second electrode is a cathode, or the first electrode is a cathode and the second electrode is an anode.

As the anode material, a material having a large work function is generally preferred so that holes can be smoothly injected into the organic material layer. Specific examples of the anode material include metals such as vanadium, chromium, copper, zinc, gold, or alloys thereof; metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO), and indium zinc oxide (IZO); combinations of metals and oxides such as ZnO:Al or SnO _{2 :Sb;} conductive polymers such as poly(3-methylthiophene), poly[3,4-(ethylene-1,2-dioxy)thiophene](PEDOT), polypyrrole, and polyaniline, but are not limited thereto.

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

The hole injection layer is a layer for injecting holes from the electrode, and as a hole injection material, it has the ability to transport holes, so it has a hole injection effect at the anode, an excellent hole injection effect on the light emitting layer or the light emitting material, and is produced in the light emitting layer A compound which prevents the movement of excitons to the electron injection layer or the electron injection material and is excellent in the ability to form a thin film is preferable. It is preferable that the highest occupied molecular orbital (HOMO) of the hole injection material is between the work function of the positive electrode material and the HOMO of the surrounding organic material layer. Specific examples of the hole injection material include metal porphyrin, oligothiophene, arylamine-based organic material, hexanitrile hexaazatriphenylene-based organic material, quinacridone-based organic material, and perylene-based organic material. of organic substances, anthraquinones, and conductive polymers of polyaniline and polythiophene series, but are not limited thereto.

The hole transport layer is a layer that receives holes from the hole injection layer and transports them to the light emitting layer. As a hole transport material, a material capable of transporting holes from the anode or hole injection layer to the light emitting layer and transferring them to the light emitting layer. This is suitable. Specific examples include, but are not limited to, an arylamine-based organic material, a conductive polymer, and a block copolymer having a conjugated portion and a non-conjugated portion together.

The light emitting material is a material capable of emitting light in the visible ray region by receiving and combining holes and electrons from the hole transport layer and the electron transport layer, respectively, and a material having good quantum efficiency for fluorescence or phosphorescence is preferable. Specific examples include 8-hydroxy-quinoline aluminum complex (Alq ₃ ); carbazole-based compounds; dimerized styryl compounds; BAlq; 10-hydroxybenzo quinoline-metal compounds; compounds of the benzoxazole, benzthiazole and benzimidazole series; Poly(p-phenylenevinylene) (PPV)-based polymers; spiro compounds; polyfluorene, rubrene, and the like, but is not limited thereto.

The emission layer may include a host material and a dopant material. The host material includes a condensed aromatic ring derivative or a heterocyclic compound containing compound. Specifically, condensed aromatic ring derivatives include anthracene derivatives, pyrene derivatives, naphthalene derivatives, pentacene derivatives, phenanthrene compounds, fluoranthene compounds, etc., and heterocyclic-containing compounds include carbazole derivatives, dibenzofuran derivatives, ladder type Furan compounds, pyrimidine derivatives, and the like, but are not limited thereto.

Preferably, the host material may include one or two or more compounds represented by the following formula (2):

[Formula 2]

In Formula 2,

Ar ₃ and Ar ₄ are each independently, substituted or unsubstituted C _6-60 aryl; _{Or substituted or unsubstituted C 2-60} heteroaryl comprising any one or more selected from the group consisting of N, O and S,

L ₃ and L ₄ are each independently, a single bond; substituted or unsubstituted C _6-60 arylene; _{Or substituted or unsubstituted C 2-60} heteroarylene comprising any one or more selected from the group consisting of N, O and S,

R ₃ are each independently hydrogen; heavy hydrogen; substituted or unsubstituted C _1-60 alkyl; substituted or unsubstituted C _3-60 cycloalkyl; substituted or unsubstituted C _6-60 aryl; _{Or substituted or unsubstituted C 2-60} heteroaryl comprising any one or more selected from the group consisting of N, O and S,

a3 is an integer from 0 to 8;

Preferably, Ar ₃ and Ar ₄ are each independently selected from substituted or unsubstituted C _6-20 aryl; Or it may be _{a C 2-20} heteroaryl comprising at least one selected from the group consisting of substituted or unsubstituted N, O and S,

More preferably, Ar ₃ and Ar ₄ are each independently phenyl, biphenylyl, terphenylyl, naphthyl, phenanthrenyl, dibenzofuranyl, dibenzothiophenyl, benzonaphthofuranyl, or benzonaph tothiophenyl.

Preferably, L ₃ and L ₄ are each independently a single bond; substituted or unsubstituted C _6-20 arylene; Or it may be _{a C 2-20} heteroarylene comprising at least one selected from the group consisting of substituted or unsubstituted N, O and S,

More preferably, L ₃ and L ₄ may each independently represent a single bond, phenylene, biphenylrylene, naphthylene, dibenzofuranylene, or dibenzothiophenylene.

Preferably, _{each R 3} is independently hydrogen; heavy hydrogen; substituted or unsubstituted C _1-10 alkyl; substituted or unsubstituted C _3-10 cycloalkyl; substituted or unsubstituted C _6-20 aryl; Or it may be _{a C 2-20} heteroaryl comprising at least one selected from the group consisting of substituted or unsubstituted N, O and S,

More preferably, R ₃ may each be hydrogen or deuterium,

Most preferably, _{each R 3} may be hydrogen.

For example, the compound represented by Formula 2 may be the following compound:

.

.

Meanwhile, an embodiment of the present invention may further include a host material in addition to the compound represented by Formula 2 above. In this case, as the material further included, there is a condensed aromatic ring derivative or a heterocyclic compound containing compound. Specifically, condensed aromatic ring derivatives include anthracene derivatives, pyrene derivatives, naphthalene derivatives, pentacene derivatives, phenanthrene compounds, fluoranthene compounds, and the like, and heterocyclic-containing compounds include carbazole derivatives, dibenzofuran derivatives, tri There may be an azine derivative, a ladder-type furan compound, a pyrimidine derivative, or a triazine derivative, and may be a mixture of two or more thereof, but is not limited thereto.

Examples of the dopant material include an aromatic amine derivative, a strylamine compound, a boron complex, a fluoranthene compound, and a metal complex. Specifically, the aromatic amine derivative is a condensed aromatic ring derivative having a substituted or unsubstituted arylamino group, and includes pyrene, anthracene, chrysene, periflanthene, and the like, having an arylamino group. As the styrylamine compound, a substituted or unsubstituted It is a compound in which at least one arylvinyl group is substituted in the arylamine, and one or two or more substituents selected from the group consisting of an aryl group, a silyl group, an alkyl group, a cycloalkyl group and an arylamino group are substituted or unsubstituted. Specifically, there are styrylamine, styryldiamine, styryltriamine, styryltetraamine, and the like, but is not limited thereto. In addition, examples of the metal complex include, but are not limited to, an iridium complex and a platinum complex. Preferably, the compound represented by Formula 1 may be included as a dopant material.

Preferably, based on 100 parts by weight of the combined weight of the compound represented by Formula 2 and the compound represented by Formula 1, the content of the compound represented by Formula 1 is 0.01 to 30 parts by weight; 0.1 to 20 parts by weight; 0.5 to 10 parts by weight; Or it may be 1 part by weight to 8 parts by weight.

The electron transport layer is a layer that receives electrons from the electron injection layer and transports them to the light emitting layer. do. Specific examples include 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 transport layer may be used with any desired cathode material as used in accordance with the prior art. In particular, examples of suitable cathode materials are conventional materials having a low work function and followed by a layer of aluminum or silver. Specifically cesium, barium, calcium, ytterbium and samarium, followed in each case by an aluminum layer or a silver layer.

The electron injection layer is a layer that injects electrons from the electrode, has the ability to transport electrons, has an electron injection effect from the cathode, an excellent electron injection effect on the light emitting layer or the light emitting material, and hole injection of excitons generated in the light emitting layer. A compound which prevents movement to a layer and is excellent in the ability to form a thin film is preferable. Specifically, fluorenone, anthraquinodimethane, diphenoquinone, thiopyran dioxide, oxazole, oxadiazole, triazole, imidazole, perylenetetracarboxylic acid, preorenylidene methane, anthrone, etc., derivatives thereof, metals complex compounds and nitrogen-containing 5-membered ring derivatives, 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-hydroxyquinolinato)manganese, Tris(8-hydroxyquinolinato)aluminum, tris(2-methyl-8-hydroxyquinolinato)aluminum, tris(8-hydroxyquinolinato)gallium, bis(10-hydroxybenzo[h] Quinolinato) beryllium, bis (10-hydroxybenzo [h] quinolinato) zinc, bis (2-methyl-8-quinolinato) chlorogallium, bis (2-methyl-8-quinolinato) ( o-crezolato)gallium, bis(2-methyl-8-quinolinato)(1-naphtolato)aluminum, bis(2-methyl-8-quinolinato)(2-naphtolato)gallium, etc. However, the present invention is not limited thereto.

The organic light emitting device according to the present invention may be a top emission type, a back emission type, or a double side emission type depending on the material used.

In addition, the compound represented by Formula 1 may be included in an organic solar cell or an organic transistor in addition to the organic light emitting device.

Hereinafter, preferred examples are presented to help the understanding of the present invention. However, the following examples are only provided for easier understanding of the present invention, and thus the content of the present invention is not limited thereto.

Preparation Example 1: Preparation of compound BD 1

(Preparation Example 1-1: Preparation of Intermediate 1)

1,4-dibromo-2,5-dimethoxybenzene (13.02 g, 44 mmol), (4-chloro-2-fluoro-5-methoxyphenyl)boronic acid in a 500 mL round-bottom flask under nitrogen atmosphere (21.6 g, 0.1 mol), tetrakis (triphenylphosphine) palladium (2.5 g, 2.2 mmol), potassium carbonate (14.6 g, 0.13 mol) were added, and tetrahydrofuran 300 mL and water 60 mL were added. The temperature of the reactor was raised to 80 °C and stirred for 12 hours. When the reaction was completed, the temperature was lowered to room temperature and the organic layer was extracted. After concentrating the obtained organic layer, intermediate 1 (14.4 g, yield 72%) was obtained by hexane/ethyl acetate chromatography separation method.

(Preparation Example 1-2: Preparation of Intermediate 2)

Intermediate 1 (14.4 g, 32 mmol), 2-fluoro-N-phenylaniline (13.2 g, 70 mmol), bis(tri-tert-butylphosphine)palladium(0)(0.9) in a 500 mL flask under nitrogen atmosphere g, 1.6 mmol), sodium tert butoxide (6.77 g, 70 mmol) and 250 mL of toluene were added and stirred at 105° C. for 16 hours. Upon completion of the reaction, after cooling to room temperature, water was added, a precipitate was formed with hexane, filtered, and washed with methanol to obtain an organic material. The produced organic material is dissolved in dichloromethane, passed through a Celite and Florisil plug, and then concentrated. The product was recrystallized using n-hexane and tetrahydrofuran to obtain an intermediate 2 (19.6 g, yield 81%).

(Preparation Example 1-3: Preparation of Intermediate 3)

Intermediate 2 (19.6 g, 26 mmol) was added to 300 mL of dichloromethane in a 500 mL flask in a nitrogen atmosphere, stirred, and then BBr ₃ (14.3 g, 57.2 mmol) diluted in 45 mL of dichloromethane was slowly added dropwise for 4 hours. The mixture was stirred at room temperature. When the reaction is completed, water is added and an organic material is obtained with ethyl acetate. After concentrating the obtained organic layer, intermediate 3 (16.4 g, yield 90%) was obtained by hexane/ethyl acetate chromatography separation method.

(Preparation Example 1-4: Preparation of compound BD 1)

Intermediate 3 (16.4 g, 23.4 mmol) and potassium carbonate (14.2 g, 0.1 mol) were placed in a 500 mL round-bottom flask in a nitrogen atmosphere, and 230 mL of N-methyl-2-pyrrolidone was added. The temperature of the reactor was raised to 125 °C and stirred for 4 hours. When the reaction was completed, the temperature was lowered to room temperature, water was added to precipitate a solid, and the filter cake was washed with ethanol and toluene to remove impurities. The obtained organic material was purified by hexane/tetrohydrofuran column chromatography separation method, and then the solvent was removed to obtain compound BD 1 (7.5 g, yield 52%).

MS[M+H] ⁺ = 620.17

Preparation Example 2: Preparation of compound BD 2

Compound BD 2 was prepared in the same manner as in the preparation method of Compound BD 1 of Preparation Example 1, except that N-(4-tert-butylphenyl)2-fluoroaniline was used instead of 2-fluoro-N-phenylaniline did

MS[M+H] ⁺ = 732.30

Preparation Example 3: Preparation of compound BD 3

Compound BD 3 was prepared in the same manner as in the preparation method of Compound BD 1 of Preparation Example 1, except that 2-fluoro-N- (4-fluorophenyl) aniline was used instead of 2-fluoro-N-phenylaniline did

MS[M+H] ⁺ = 655.15

Preparation Example 4: Preparation of compound BD 4

Compound BD 4 in the same manner as in the preparation of Compound BD 1 of Preparation Example 1, except that 2-fluoro-N-(4-(trimethylsilyl)phenyl)aniline was used instead of 2-fluoro-N-phenylaniline was prepared.

MS[M+H] ⁺ = 764.25

Preparation Example 5: Preparation of compound BD 5

Method for preparing compound BD 1 of Preparation Example 1, except that N-(2-fluorophenyl)-9,9-dimethyl-9H-fluoren-2-amine was used instead of 2-fluoro-N-phenylaniline Compound BD 5 was prepared in the same manner as described above.

MS[M+H] ⁺ = 852.30

Preparation 6: Preparation of compound BD 6

Compound BD 6 was prepared in the same manner as in the preparation method of Compound BD 1 of Preparation Example 1, except that N- (2-fluorophenyl) naphthalen-2-amine was used instead of 2-fluoro-N-phenylaniline did

MS[M+H] ⁺ = 720.20

Example 1

A glass substrate on which indium tin oxide (ITO) was deposited as a thin film to a thickness of 1500 Å was placed in distilled water in which detergent was dissolved, and washed with ultrasonic waves. The ITO was washed for 30 minutes. Thereafter, ultrasonic washing was performed for 10 minutes by repeating twice with distilled water. After washing with distilled water, ultrasonic washing with solvents of isopropyl alcohol and acetone was performed for 30 minutes each and dried, and then the substrate was transported to a glove box.

On the thus prepared ITO transparent electrode, a coating composition obtained by dissolving the following compound A and compound IB in a weight ratio of 8:2 in 2 wt% of cyclohexanone was spin-coated to form a hole injection layer having a thickness of 300 Å, and hot under a nitrogen atmosphere. The coating composition was cured at 220 °C and 30 minutes on the plate. On the hole injection layer, a composition obtained by dissolving the following compound A in toluene at 1 wt% was spin-coated to form a hole transport layer having a thickness of 400 Å. Thereafter, the coating composition was cured at 230° C. and 30 minutes on a hot plate under a nitrogen atmosphere. On the hole transport layer, a composition obtained by dissolving the following compound B and the previously prepared compound BD 1 in toluene at 0.6 wt % (compound B: weight ratio of compound BD 1 = 98:2) was spin-coated to form a light emitting layer with a thickness of 200 Å The coating composition was cured at 120° C. and 10 minutes on a hot plate under a nitrogen atmosphere. Thereafter, the following compound G (200 Å), LiF (12 Å), and Al (2000 Å) were sequentially deposited on the light emitting layer by transferring to a vacuum evaporator to prepare an organic light emitting device.

In the above process, the deposition rate of organic material was maintained at 0.4 to 0.7 Å/sec, the deposition rate of LiF of the cathode was maintained at 0.3 Å/sec, and the deposition rate of aluminum was maintained at 2 Å/sec, and the vacuum degree during deposition was 2*10 ^-7 to 5*10 ^-8 torr were maintained.

Examples 2 to 6

An organic light emitting diode was manufactured in the same manner as in Example 1, except that the compound shown in Table 1 was used instead of Compound BD 1.

Comparative Examples 1 to 4

An organic light emitting diode was manufactured in the same manner as in Example 1, except that the compound shown in Table 1 was used instead of Compound BD 1. Compounds C, D, E and F of Table 1 are as follows, respectively.

Experimental example

Examples and with respect to the organic light emitting device prepared in Comparative Example, were measured drive voltage, maximum emission wavelength, the current efficiency and the quantum efficiency at a current density of 10 mA / cm ^2, the life is a current density of 20 mA / cm ² was measured and the results are shown in Table 1 below. In Table 1 below, T95 denotes a time measured until the initial luminance decreases to 95% at a ^{current density of 20 mA/cm 2 .}

division compound maximum emission wavelength
(nm) drive voltage
(V) current efficiency
(cd/A) Lifetime (T95)
(hr) Example 1 compound BD 1 453 4.38 5.12 129 Example 2 compound BD 2 456 4.25 5.40 152 Example 3 compound BD 3 452 4.26 5.39 115 Example 4 compound BD 4 456 4.26 5.48 178 Example 5 compound BD 5 458 4.30 5.81 202 Example 6 compound BD 6 454 4.29 5.49 166 Comparative Example 1 compound C 460 4.22 3.95 123 Comparative Example 2 compound D 441 4.42 4.84 108 Comparative Example 3 compound E 453 4.38 4.90 76 Comparative Example 4 compound F 440 4.45 5.06 35

As shown in Table 1, it was confirmed that the organic light emitting device using the compound of the present invention as a dopant of the light emitting layer exhibits significantly superior characteristics, particularly in terms of current efficiency and/or lifespan.

1: Substrate 2: Anode
3: light emitting layer 4: cathode
5: hole injection layer 6: hole transport layer
7: electron transport layer

Claims (13)

A compound represented by the following formula (1):
[Formula 1]

In Formula 1,
Ar ₁ and Ar ₂ are each independently, substituted or unsubstituted C _6-60 aryl; _{Or substituted or unsubstituted C 2-60} heteroaryl comprising any one or more selected from the group consisting of N, O and S,
L ₁ and L ₂ are each independently, a single bond; substituted or unsubstituted C _6-60 arylene; _{Or substituted or unsubstituted C 2-60} heteroarylene comprising any one or more selected from the group consisting of N, O and S,
R ₁ and R ₂ are each independently hydrogen; heavy hydrogen; substituted or unsubstituted C _1-60 alkyl; substituted or unsubstituted C _6-60 aryl; _{Or C 2-60} heteroaryl comprising at least one selected from the group consisting of substituted or unsubstituted N, O and S, or two adjacent R ₁ or two adjacent R ₂ are bonded to each other to C _{6- 60} aromatic rings; Or to form _{a C 2-60} heteroaromatic ring comprising any one or more selected from the group consisting of N, O and S,
a1 and a2 are each independently an integer of 0-4.
According to claim 1,
The compound represented by Formula 1 is represented by any one of the following Formulas 1-1 to 1-4,
compound:
[Formula 1-1]

[Formula 1-2]

[Formula 1-3]

[Formula 1-1]

In Formulas 1-1 to 1-4,
Ar ₁ , Ar ₂ , L ₁ , L ₂ , R ₁ and R ₂ are as defined in claim 1.
According to claim 1,
Ar ₁ and Ar ₂ are each independently phenyl, biphenylyl, naphthyl, dimethylfluorenyl, diphenylfluorenyl, dimethylbenzofluorenyl, benzofuranyl, dibenzofuranyl, pyridinyl, or carba sleepy,
wherein Ar ₁ and Ar ₂ are each independently, unsubstituted, or consisting of deuterium, C _1-10 alkyl, tri(C _1-10 alkyl)silyl, tri(C _6-20 aryl)silyl, halogen and cyano substituted with 1 to 5 substituents selected from the group,
compound.
According to claim 1,
Ar ₁ and Ar ₂ are each independently any one selected from the group consisting of
compound:

.
According to claim 1,
Ar ₁ and Ar ₂ are the same as each other,
compound.
According to claim 1,
L ₁ and L ₂ are each independently a single bond, phenylene, or naphthylene,
compound.
According to claim 1,
L ₁ and L ₂ are equal to each other,
compound.
According to claim 1,
R ₁ and R ₂ are each independently hydrogen, deuterium, methyl, propyl, isopropyl, butyl, tertbutyl, phenyl, phenyl substituted with one tertbutyl, biphenylyl, naphthyl, benzofuranyl, dibenzo It is furanyl, or carbazolyl, or two adjacent R ₁ or two adjacent R ₂ are joined to each other to form a benzene ring, a furan ring or a thiophene ring,
compound.
According to claim 1,
R ₁ and R ₂ are the same as each other,
compound.
According to claim 1,
a1 and a2 are each independently an integer of 0 to 2,
compound.
According to claim 1,
Ar ₁ and Ar ₂ are identical to each other, L ₁ and L ₂ are identical to each other, R ₁ and R ₂ are identical to each other, a1 and a2 are identical to each other,
compound.
According to claim 1,
The compound represented by Formula 1 is any one selected from the group consisting of
compound:

.
a first electrode; a second electrode provided to face the first electrode; and at least one organic material layer provided between the first electrode and the second electrode, wherein at least one of the organic material layers contains the compound according to any one of claims 1 to 12 doing,
organic light emitting device.

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