KR20210069427A - 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 using the same. The compound represented by a chemical formula 1 may be used as a material for an organic material layer of the organic light emitting device, and may improve efficiency, low driving voltage and/or lifespan characteristics in the organic light emitting device.

Description

Novel compound and organic light emitting device using same {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-layered structure composed of different materials in order to increase the efficiency and stability of the organic light emitting device, and for example, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and the like. 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 When it falls back to the ground state, it lights up.

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

Korean Patent Publication No. 10-2000-0051826

The present invention relates to a novel compound 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,

X ₁ to X ₁₀ are each independently N or CR ₂ , provided that at least one of X is N,

Y is each independently O, S or CR ₃ R ₄ ,

Ar is substituted or unsubstituted C _{6-60 aryl or substituted or unsubstituted C 5-60} heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S,

R ₁ to R ₄ are each independently hydrogen, deuterium, substituted or unsubstituted C _1-60 alkyl, substituted or unsubstituted C _3-60 cycloalkyl, substituted or unsubstituted C _6-60 aryl, N, O _{And a substituted or unsubstituted C 5-60} heteroaryl containing one or more heteroatoms selected from the group consisting of S, or tri(C _1-60 alkyl)silyl,

n is an integer from 0 to 10;

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 may be used as a material for an organic material layer of an organic light emitting device, and may improve efficiency, low driving voltage, and/or lifespan characteristics in an organic light emitting device. In particular, the compound represented by the above formula (1) may be used as a material for hole injection, hole transport, hole injection and transport, light emission, electron transport, or electron injection.

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 7, an electron transport layer 8, and a cathode 4 did it
3 is a substrate (1), anode (2), hole injection layer (5), hole transport layer (6), electron blocking layer (9), light emitting layer (7), hole blocking layer (10), electron transport layer (8) , an example of an organic light emitting device including an electron injection layer 11 and a cathode 4 is shown.

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

The present invention provides a compound represented by the above formula (1).

,

, 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; 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; 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 including one or more, or substituted or unsubstituted with two or more substituents of the exemplified substituents connected. . 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, the 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 alkyl group has 1 to 10 carbon atoms. 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, a triazole group, 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, benzooxazole group, benzoimidazole group, benzothiazole group, benzocarbazole group, benzothiophene group, dibenzothiophene group, benzofuranyl group, phenanthroline group, thiazolyl group, an isoxazolyl group, an oxadiazolyl group, a thiadiazolyl group, a benzothiazolyl group, a phenothiazinyl group, and a dibenzofuranyl group, but are 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 example 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, as for heteroaryl among heteroarylamines, the description of the above-described heterocyclic group 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 heterocyclic group described above 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.

Preferably, two or more of _{X 1} to X _{10 may be N.}

Preferably, both X ₁ and X ₂ may be CR _{2 ,} or both may be N.

Preferably, the at least two of X ₃ to X ₆ CR _2, the X ₇ to X ₁₀ 2 or more of the may be a CR _2.

For example, Formula 1 may be represented by any one of Formulas 1-1 to 1-7 below:

[Formula 1-1]

[Formula 1-2]

[Formula 1-3]

[Formula 1-4]

[Formula 1-5]

[Formula 1-6]

[Formula 1-7]

In Formulas 1-1 to 1-7,

Descriptions of Y, Ar, R ₁ , R ₂ and n are as defined above.

Preferably, each Y may be independently O, S or C(CH ₃ ) ₂ , for example, Formula 1 may be any one selected from the group consisting of:

.

.

Preferably, Ar can be substituted or unsubstituted C _{6-20 aryl or substituted or unsubstituted C 5-20} heteroaryl containing one or more heteroatoms selected from the group consisting of N, O and S And, more preferably, it may be any one selected from the group consisting of:

.

.

Preferably, n may be 0, 1 or 10.

Preferably, _{each R 1} may independently be hydrogen or deuterium.

Preferably, R ₂ may each independently be hydrogen, deuterium, substituted or unsubstituted C _1-20 alkyl, or tri(C _1-20 alkyl)silyl, more preferably hydrogen, deuterium, methyl, t-butyl or trimethylsilyl.

For example, the compound may be selected from the group consisting of:

.

.

Meanwhile, the compound represented by Chemical Formula 1 may be prepared by a preparation method as shown in Scheme 1 below.

[Scheme 1]

In Scheme 1, T is halogen, preferably bromo, or chloro, and definitions of other substituents are the same as described above.

Specifically, the compound represented by Formula 1 is prepared by combining starting materials through a Suzuki coupling reaction. The Suzuki coupling reaction is preferably performed in the presence of a palladium catalyst and a base, and the reactor for the Suzuki coupling reaction can be changed as known in the art. The manufacturing method may be more specific in Preparation Examples to be described later.

In addition, the present invention provides an organic light emitting device including the compound represented by the formula (1). 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 of the organic material layers 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 material layer may include a hole injection layer, a hole transport layer, a layer that injects and transports holes at the same time or an electron blocking layer, and the hole injection layer, the hole transport layer, a layer that injects and transports holes at the same time or an electron blocking layer. The layer may include a compound represented by Formula 1 above.

In addition, the organic layer may include an emission layer, and the emission layer may include a compound represented by Formula 1 above. In this case, the compound represented by Formula 1 may be used as a host material in the emission layer, and more specifically, the compound represented by Formula 1 may be used as a host used in the emission layer of the green organic light emitting device.

In addition, the emission layer may include two or more types of hosts, and when the emission layer includes two or more types of hosts, at least one of the hosts may be a compound represented by Formula 1 above.

In addition, the organic layer may include a hole blocking layer, an electron transport layer, an electron injection layer, or a layer that simultaneously transports and injects electrons, and the hole blocking layer, the electron transport layer, the electron injection layer, or the electron transport and electron injection layer. The layer for simultaneous injection may include the compound represented by Formula 1 above.

In addition, the light emitting layer may further include a compound represented by the following formula 2:

[Formula 2]

In Formula 2,

Ar ₁ and Ar ₂ are each independently, substituted or unsubstituted C _6-60 aryl; _{Or a substituted or unsubstituted C 5-60} heteroaryl containing one or more heteroatoms selected from the group consisting of N, O and S;

R ₅ and R ₆ are each independently hydrogen; heavy hydrogen; halogen; cyano; nitro; amino; substituted or unsubstituted C _1-60 alkyl; substituted or unsubstituted C _3-60 cycloalkyl; substituted or unsubstituted C _2-60 alkenyl; substituted or unsubstituted C _6-60 aryl; _{Or a substituted or unsubstituted C 5-60} heteroaryl containing one or more heteroatoms selected from the group consisting of N, O and S;

p and q are each independently an integer of 0 to 7.

Preferably, Ar ₁ and Ar ₂ are each independently selected from substituted or unsubstituted C _6-20 aryl; _{Or it may be a substituted or unsubstituted C 5-20} heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S, more preferably phenyl, biphenylyl, terphenylyl, naphthyl, dibenzofuranyl, dibenzothiophenyl, or dimethylfluorenyl.

Preferably, R ₅ and R ₆ are each independently hydrogen; or phenyl.

Preferably, p and q may each independently be 0 or 1.

For example, the compound represented by Formula 2 may be selected from the group consisting of the following compounds:

.

.

Also, 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. Also, 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 an organic light emitting device according to an embodiment of the present invention is illustrated in FIGS. 1 to 3 .

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 . In such a structure, the compound represented by Formula 1 may be included in the light emitting layer.

2 is an example of an organic light emitting device comprising a substrate 1, an anode 2, a hole injection layer 5, a hole transport layer 7 (6), a light emitting layer 7, an electron transport layer 8, and a cathode 4 it will be shown 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, the light emitting layer, and the electron transport layer.

3 is a substrate (1), anode (2), hole injection layer (5), hole transport layer (6), electron blocking layer (9), light emitting layer (7), hole blocking layer (10), electron transport layer (8) , an example of an organic light emitting device including an electron injection layer 11 and a cathode 4 is shown. In such a structure, the compound represented by Formula 1 may be included in one or more of the hole injection layer, the hole transport layer, the electron blocking layer, the light emitting layer, the hole blocking layer, the electron transport layer, and the electron injection 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 device 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 forming an organic material layer including a hole injection layer, a hole transport layer, a light emitting layer and an electron transport layer thereon, and then 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, spraying, 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 multilayer structure 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 with respect to 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, polyaniline and polythiophene-based conductive polymers, and the like, 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. A material capable of transporting holes from the anode or hole injection layer to the light emitting layer as a hole transport material. 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 electron blocking layer is formed on the hole transport layer, preferably provided in contact with the light emitting layer, to control hole mobility and prevent excessive movement of electrons to increase the hole-electron coupling probability, thereby increasing the efficiency of the organic light emitting device plays a role in improving The electron blocking layer includes an electron blocking material, and as the electron blocking material, a material having a stable structure that prevents electrons from flowing out of the light emitting layer is suitable. As a specific example, an arylamine-based organic material may be used, but is not limited thereto.

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 compound containing a hetero ring. 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, ladder-type compounds. Furan compounds, pyrimidine derivatives, and the like, but are 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, and periflanthene having an arylamino group, and the styrylamine compound is a substituted or unsubstituted derivative. 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, the metal complex includes, but is not limited to, an iridium complex, a platinum complex, and the like.

The hole blocking layer is formed on the light emitting layer, specifically, the hole blocking layer is provided in contact with the light emitting layer, preventing excessive movement of holes and increasing the hole-electron coupling probability, thereby improving the efficiency of the organic light emitting device. do The hole blocking layer includes a hole blocking material, and as the hole blocking material, a material having a stable structure in which holes do not flow out of the light emitting layer is suitable. Examples of the hole blocking material include azine derivatives including triazine; triazole derivatives; oxadiazole derivatives; phenanthroline derivatives; A compound into which an electron withdrawing group is introduced, such as a phosphine oxide derivative, may be used, but the present invention is not limited thereto.

The electron transport layer is a layer that receives electrons from the electron injection layer and transports them to the light emitting layer. As an electron transport material, a material that can receive electrons from the cathode and transfer them to the light emitting layer is suitable. 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. It is not limited to this.

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.

The compound represented by Formula 1 and the preparation of an organic light emitting device including the same will be described in detail in Examples below. However, the following examples are for illustrating the present invention, and the scope of the present invention is not limited thereto.

[Synthesis Example]

Synthesis Example 1 Synthesis of intermediate a

Step 1) Synthesis of intermediate a-1

In a nitrogen atmosphere, 2,5-dichloro-4,6-difluoropyrimidine (15g, 81.1mmol), phenol (16.8g, 178.4mmol), potassium carbonate (33.6g, 243.3mmol) were added to NMP 225ml, and stirred and refluxed. After reacting for 4 hours, cooling to room temperature, and separating the organic layer using chloroform and water, the organic layer was distilled. This was again dissolved in chloroform, washed twice with water, the organic layer was separated, anhydrous magnesium sulfate was added, stirred, filtered, and the filtrate was distilled under reduced pressure. The concentrated compound was purified by silica gel column chromatography to prepare 17.6 g of Intermediate a-1. (Yield 65%, MS: [M+H]+= 334)

Step 2) Synthesis of intermediate a

Intermediate a-1 (15g, 45mmol) was dissolved in 300ml of tert-butylbenzene in a nitrogen atmosphere, and then cooled to 0°C. Here, 1.7 M of tert-butyllithium in pentane (39.7ml, 67.5mmol) was added and stirred at 60°C for 2 hours. After that, the reactant was cooled to 0 °C again, boron tribromide (6.5ml, 67.5mmol) was added thereto, and then stirred at room temperature for 0.5 hours. The reaction mass was again cooled to 0 °C, N,N-diisopropylethylamine (23.5ml, 135.1mmol) was added thereto, and then stirred at 60 °C for 2 hours. After completion of the reaction, the reaction was cooled to room temperature, the organic layer was separated using chloroform and water, and the organic layer was distilled. This was again dissolved in chloroform, washed twice with water, the organic layer was separated, anhydrous magnesium sulfate was added, stirred, filtered, and the filtrate was distilled under reduced pressure. The concentrated compound was purified by silica gel column chromatography to prepare 6.3 g of intermediate a. (Yield 46%, MS: [M+H]+= 308)

Synthesis Example 2: Synthesis of intermediate b

In Synthesis Example 1, except that phenol was changed to phen-d5-ol and used, Intermediate b was prepared in the same manner as that of Intermediate a. (MS[M+H] ⁺ = 316)

Synthesis Example 3: Synthesis of intermediate c

In Synthesis Example 1, 2,5-dichloro-4,6-difluoropyrimidine was changed to 2,5-dibromo-1,3-difluorobenzene, and phenol was changed to pyridin-4-ol. Intermediate c was prepared by the same preparation method as the method. (MS[M+H] ⁺ = 352)

Synthesis Example 4: Synthesis of intermediate d

In Synthesis Example 1, 2,5-dichloro-4,6-difluoropyrimidine was changed to 2,5-dibromo-1,3-difluorobenzene, and phenol was changed to pyridin-2-ol, except that it was used, Preparation of intermediate a Intermediate d was prepared by the same preparation method as the method. (MS[M+H] ⁺ = 352)

Synthesis Example 5: Synthesis of Intermediate e

In Synthesis Example 1, except that phenol was changed to benzenethiol and used, Intermediate e was prepared in the same manner as that of Intermediate a. (MS[M+H] ⁺ = 340)

Synthesis Example 6 Synthesis of Intermediate f

Step 1) Synthesis of intermediate f-1

In a nitrogen atmosphere, 2,5-dichloro-4,6-difluoropyrimidine (20g, 108.1mmol), phenol (10.2g, 108.1mmol), potassium carbonate (44.8 g, 324.4mmol) were added to 300ml of NMP, followed by stirring and reflux. After reacting for 7 hours, cooling to room temperature, and separating the organic layer using chloroform and water, the organic layer was distilled. This was again dissolved in chloroform, washed twice with water, the organic layer was separated, anhydrous magnesium sulfate was added, stirred, filtered, and the filtrate was distilled under reduced pressure. The concentrated compound was purified by silica gel column chromatography to prepare 19 g of intermediate f-1. (Yield 68%, MS: [M+H] + = 260)

Step 2) Synthesis of intermediate f-2

Intermediate f-1 (20g, 77.2mmol), benzenethiol (8.5g, 77.2mmol), potassium carbonate (32 g, 231.6mmol) was added to 300ml of NMP in a nitrogen atmosphere, and stirred and refluxed. After reacting for 5 hours, cooling to room temperature, and separating the organic layer using chloroform and water, the organic layer was distilled. This was again dissolved in chloroform, washed twice with water, the organic layer was separated, anhydrous magnesium sulfate was added, stirred, filtered, and the filtrate was distilled under reduced pressure. The concentrated compound was purified by silica gel column chromatography to prepare 17.5 g of intermediate f-2. (Yield 65%, MS: [M+H]+= 350)

Step 3) Synthesis of intermediate f

In step 2 of Synthesis Example 1, an intermediate f was prepared in the same manner as in the preparation method of the intermediate a, except that the intermediate a-1 was changed to the intermediate f-2 and used. (MS[M+H] ⁺ = 324)

Synthesis Example 7: Synthesis of Compound 1

Step 1) Synthesis of compound 1-1

11,12-dihydroindolo[2,3-a]carbazole (15g, 58.5mmol) and bromobenzene (10.1g, 64.4mmol) were added to 300ml of toluene in a nitrogen atmosphere, stirred and refluxed. After that, sodium tert-butoxide (16.9g, 175.6mmol) and bis(tri-tert-butylphosphine)palladium (0 (0.9g, 1.8mmol) were added. After 2 hours of reaction, cooled to room temperature and organic layer using chloroform and water. After separation, the organic layer was distilled.This was again dissolved in chloroform, washed twice with water, the organic layer was separated, anhydrous magnesium sulfate was added, stirred, filtered, and the filtrate was distilled under reduced pressure.The concentrated compound was purified by silica gel column chromatography. Purification was performed to prepare 11.7 g of compound 1-1 (yield 60%, MS: [M+H]+= 333).

Step 2) Synthesis of compound 1

Compound 1-1 (15g, 45.1mmol) and Intermediate a (15.2g, 49.6mmol) were added to 300ml of toluene in a nitrogen atmosphere, and stirred and refluxed. After that, sodium tert-butoxide (13g, 135.4mmol) and bis(tri-tert-butylphosphine)palladium(0 (0.7g, 1.4mmol) were added. After 3 hours of reaction, cooled to room temperature and the organic layer was washed with chloroform and water. After separation, the organic layer was distilled.This was again dissolved in chloroform, washed twice with water, the organic layer was separated, anhydrous magnesium sulfate was added, stirred, filtered, and the filtrate was distilled under reduced pressure.The concentrated compound was purified by silica gel column chromatography. After that, 12.5 g of compound 1 was prepared through sublimation purification (yield 46%, MS: [M+H]+= 603).

Synthesis Example 8: Synthesis of compound 2

In Synthesis Example 7, compound 2 was prepared in the same manner as in the preparation method of compound 1, except that bromobenzene was changed to 3-bromo-1,1'-biphenyl. (MS[M+H] ⁺ = 680)

Synthesis Example 9: Synthesis of compound 3

In Synthesis Example 7, Compound 2 was prepared in the same manner as in Compound 1, except that bromobenzene was changed to 4-chlorodibenzo[b,d]thiophene. (MS[M+H] ⁺ = 710)

Synthesis Example 10: Synthesis of compound 4

In step 2 of Synthesis Example 7, compound 2 was prepared in the same manner as in the preparation method of compound 1, except that the intermediate a was changed to the intermediate b and used. (MS[M+H] ⁺ = 612)

Synthesis Example 11: Synthesis of compound 5

In step 2 of Synthesis Example 7, compound 2 was prepared in the same manner as in the preparation method of compound 1, except that the intermediate a was changed to the intermediate c and used. (MS[M+H] ⁺ = 603)

Synthesis Example 12: Synthesis of compound 6

In step 2 of Synthesis Example 7, compound 2 was prepared in the same manner as in the preparation method of compound 1, except that the intermediate a was changed to the intermediate d and used. (MS[M+H] ⁺ = 603)

Synthesis Example 13: Synthesis of compound 7

In step 2 of Synthesis Example 7, compound 2 was prepared in the same manner as in the preparation method of compound 1, except that the intermediate a was changed to the intermediate e and used. (MS[M+H]+= 636)

Synthesis Example 14: Synthesis of compound 8

In step 2 of Synthesis Example 7, compound 2 was prepared in the same manner as in the preparation method of compound 1, except that the intermediate a was changed to the intermediate f and used. (MS[M+H] ⁺ = 620)

[Example]

<Example 1>

A glass substrate coated with a thin film of ITO (Indium Tin Oxide) to a thickness of 1,400 Å was placed in distilled water in which detergent was dissolved and washed with ultrasonic waves. At this time, a product manufactured by Fischer Co. was used as the detergent, and distilled water that was secondarily filtered with a filter manufactured by Millipore Co. was used as the distilled water. After washing ITO for 30 minutes, ultrasonic cleaning was performed for 10 minutes by repeating twice with distilled water. After washing with distilled water, ultrasonic washing was performed with a solvent of isopropyl alcohol, acetone, and methanol, dried, and then transported to a plasma cleaner. In addition, after cleaning the substrate for 5 minutes using oxygen plasma, the substrate was transported to a vacuum evaporator.

On the thus prepared ITO transparent electrode, the following HT-A and 5% by weight of PD were thermally vacuum deposited to a thickness of 100 Å, and then only HT-A material was deposited to a thickness of 1150 Å to form a hole transport layer. The following HT-B was thermally vacuum-deposited to a thickness of 450 Å as an electron blocking layer thereon. Then, as a host, compound 1 prepared above was vacuum-deposited to a thickness of 400 Å using 15% by weight of GD of the host as a dopant to form an emission layer. Then, as a hole blocking layer, the following ET-A was vacuum-deposited to a thickness of 50 Å. Then, as the electron transport and injection layer, the following ET-B and Liq were thermally vacuum-deposited at a ratio of 2:1 to a thickness of 250 Å, and then LiF and magnesium were vacuum-deposited to a thickness of 30 Å at a ratio of 1:1. On the electron injection layer, magnesium and silver were deposited in a ratio of 1:4 to a thickness of 160 Å to form a cathode, thereby manufacturing an organic light emitting device.

Examples 2 to 8

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 1.

Examples 9 to 14

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 1. In Table 1 below, the ratio of each compound means a weight ratio, and the compounds PGH-1 and PGH-2 are as follows, respectively.

Comparative Examples 1 to 4

An organic light emitting diode was manufactured in the same manner as in Experimental Example 1, except that the compound shown in Table 1 was used instead of Compound 1. In Table 1, compounds GH-A and GH-B are as follows, respectively.

By applying a current to the organic light emitting devices manufactured in Examples 1 to 14 and Comparative Examples 1 to 4, voltage, efficiency, and lifetime (T95) were measured, and the results are shown in Table 1 below. At this time, the voltage and efficiency were ^{measured by applying a current density of 10 mA/cm 2} , and T95 is the time until the initial luminance decreases to 95% at a current density of 20 mA/cm ^{2 .}

host @ 10mA/cm ² @ 20mA/cm ² Voltage
(V) efficiency
(cd/A) life span
(T95, hr) Example 1 compound 1 4.71 52.5 85 Example 2 compound 2 4.68 53.1 92 Example 3 compound 3 4.65 53.2 90 Example 4 compound 4 4.71 52.5 104 Example 5 compound 5 4.79 51.3 85 Example 6 compound 6 4.78 51.7 84 Example 7 compound 7 4.85 51.2 80 Example 8 compound 8 4.75 52.1 82 Example 9 PGH-1: Compound 1 (60:40) 4.21 60.2 121 Example 10 PGH-1:Compound 3 (60:40) 4.18 62.9 129 Example 11 PGH-1:Compound 5 (60:40) 4.31 62.1 110 Example 12 PGH-2:Compound 4 (60:40) 4.38 63.1 141 Example 13 PGH-2: Compound 6 (60:40) 4.25 64.0 119 Example 14 PGH-2: Compound 8 (60:40) 4.43 61.1 108 Comparative Example 1 GH-A 5.57 42.2 42 Comparative Example 2 GH-B 5.77 41.8 53 Comparative Example 3 PGH-1:GH-A (60:40) 5.37 45.5 75 Comparative Example 4 PGH-2:GH-B (60:40) 5.57 47.1 73

As shown in Table 1, it can be seen that Examples 1 to 14 to which the compound of [Formula 1] is applied have improved performance in all aspects of driving voltage, efficiency, and lifespan, compared to Comparative Examples 1 to 4.

The compound having the structure of [Formula 1] and the compounds of GH-A and GH-B applied to Comparative Examples all have a structure in which a ring structure including indolocarbazole and boron is linked, where indolocarbazole is a hole donor The structure including boron has an electron accepting property and thus both holes and electron transport are possible, so it has a structure suitable for application as a host of the light emitting layer. In particular, the compound of [Formula 1] is characterized in that at least one X in the ring structure including boron is a nitrogen atom. Due to this, the electron accepting property of the material becomes better, the electron injection property into the light emitting layer is improved, and the voltage is lowered. In addition, the electron transport ability also rises, which is advantageous for balancing the charge in the light emitting layer, so it is excellent in efficiency and lifespan characteristics. It can be seen that all properties are improved.

As shown in [Table 1], when compared with GH-A and GH-B that do not contain a nitrogen atom, a better difference in characteristics can be confirmed. As a result, when the compound of Formula 1 is used as a light emitting layer of an organic electroluminescent device, a device with low voltage, high efficiency, and long life can be obtained.

1: Substrate 2: Anode
3: light emitting layer 4: cathode
5: hole injection layer 6: hole transport layer
7: light emitting layer 8: electron transport layer
9: electron blocking layer 10: hole blocking layer
11: electron injection layer

Claims (13)

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

In Formula 1,
X ₁ to X ₁₀ are each independently N or CR ₂ , provided that at least one of X is N,
Y is each independently O, S or CR ₃ R ₄ ,
Ar is substituted or unsubstituted C _{6-60 aryl or substituted or unsubstituted C 5-60} heteroaryl containing at least one heteroatom selected from the group consisting of N, O and S,
R ₁ to R ₄ are each independently hydrogen, deuterium, substituted or unsubstituted C _1-60 alkyl, substituted or unsubstituted C _3-60 cycloalkyl, substituted or unsubstituted C _6-60 aryl, N, O _{And a substituted or unsubstituted C 5-60} heteroaryl containing one or more heteroatoms selected from the group consisting of S, or tri(C _1-60 alkyl)silyl,
n is an integer from 0 to 10;
According to claim 1,
2 or more of X ₁ to X _{10 is N.}
According to claim 1,
Formula 1 is a compound represented by any one of Formulas 1-1 to 1-7:
[Formula 1-1]

[Formula 1-2]

[Formula 1-3]

[Formula 1-4]

[Formula 1-5]

[Formula 1-6]

[Formula 1-7]

In Formulas 1-1 to 1-7,
Descriptions of Y, Ar, R ₁ , R ₂ and n are as defined in claim 1.
According to claim 1,
each Y is independently O, S or C(CH ₃ ) ₂ .
According to claim 1,
Ar is any one selected from the group consisting of:

.
According to claim 1,
R ₁ is each independently hydrogen or deuterium.
According to claim 1,
and _{each R 2} is independently hydrogen, deuterium, methyl, t-butyl or trimethylsilyl.
According to claim 1,
The compound represented by Formula 1 is any one selected from the group consisting of:

.
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 8 which is an organic light emitting device.
10. The method of claim 9,
The organic material layer including the compound is a light emitting layer, an organic light emitting device.
11. The method of claim 10,
The light emitting layer is an organic light emitting device further comprising a compound represented by the following formula 2:
[Formula 2]

In Formula 2,
Ar ₁ and Ar ₂ are each independently, substituted or unsubstituted C _6-60 aryl; _{Or a substituted or unsubstituted C 5-60} heteroaryl containing one or more heteroatoms selected from the group consisting of N, O and S;
R ₅ and R ₆ are each independently hydrogen; heavy hydrogen; halogen; cyano; nitro; amino; substituted or unsubstituted C _1-60 alkyl; substituted or unsubstituted C _3-60 cycloalkyl; substituted or unsubstituted C _2-60 alkenyl; substituted or unsubstituted C _6-60 aryl; _{Or a substituted or unsubstituted C 5-60} heteroaryl containing one or more heteroatoms selected from the group consisting of N, O and S;
p and q are each independently an integer of 0 to 7.
12. The method of claim 11,
Ar ₁ and Ar ₂ are each independently phenyl, biphenylyl, terphenylyl, naphthyl, dibenzofuranyl, dibenzothiophenyl, or dimethylfluorenyl.
12. The method of claim 11,
The compound represented by Formula 2 is any one selected from the group consisting of:

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