KR20170003471A - An electroluminescent compound and an electroluminescent device comprising the same - Google Patents

Abstract

The present invention relates to an organic light-emitting compound used as a hole inject or hole transport material of an organic electroluminescent device or used as a doping material thereof. The organic light-emitting compound according to the present invention has a deep LUMO value, and thus a low voltage driving and high efficiency organic electroluminescent device can be realized when the deep LUMO value is used alone or as a doping material for an organic layer of the organic electroluminescent device, thereby being able to be used in various display device.

Description

TECHNICAL FIELD The present invention relates to an organic electroluminescent compound and an electroluminescent device comprising the same,

The present invention relates to an organic light emitting compound, and more particularly, to an organic light emitting compound which is used as a hole injecting or hole transporting material of an organic electroluminescent device, or an organic light emitting compound used as a doping material thereof, And an organic electroluminescent device.

The organic electroluminescent device can not only form an element on a transparent substrate but also can operate at a low voltage of 10 V or less as compared with a plasma display panel (Plasma Display Panel) or an inorganic electroluminescence (EL) display, It has the advantage of excellent color and has three colors of green, blue, and red. It has recently become a subject of interest as a next generation display device.

However, in order for such an organic electroluminescent device to exhibit such characteristics, a hole injecting material, a hole transporting material, a light emitting material, an electron transporting material, and an electron injecting material, which are materials forming an organic layer in a device, However, until now, stable and efficient development of an organic layer material for an organic electroluminescence element has not been sufficiently developed yet. Therefore, there is a continuing demand for development of new materials having low-voltage driving, high efficiency and long life.

The present invention relates to a novel organic light emitting compound which can be used as a hole injecting material, a hole transporting material or a doping material thereof in an organic material layer of an organic electroluminescent device to realize low voltage driving and high efficiency light emitting characteristics of the device and an organic electroluminescent device .

The present invention provides any one of the organic electroluminescent compounds selected from compounds represented by the following formulas (I) to (VIII) for solving the above-mentioned problems.

(I) [Formula II]

[Formula (III) [Formula IV]

[Formula V] (VI)

[Formula VII] (VIII)

Further, the present invention provides an organic electroluminescent device in which the compound represented by the above formulas (I) to (VIII) is employed singly or as an organic material layer as a doping material.

The specific structures and substituents of the compounds represented by the above formulas (I) to (VIII) will be described later.

Since the organic luminescent compound according to the present invention has characteristics of having a deep LUMO value, when the organic luminescent compound is used alone or as a doping material in the organic EL device, it is possible to realize a low voltage driving and high efficiency organic electroluminescent device, Which is useful for devices.

1 to 5 are cross-sectional views illustrating the structure of an organic electroluminescent device according to an embodiment of the present invention.

Hereinafter, the present invention will be described more specifically.

One aspect of the present invention relates to an organic luminescent compound represented by the following formulas (I) to (VIII).

(I) [Formula II]

[Formula (III) [Formula IV]

[Formula V] (VI)

[Formula VII] (VIII)

In the above formulas (I) to (VIII)

X ₁ to X ₇ are the same or different and each independently selected from N, O, S, C, CR ₁₃ , NR ₁₄ , CR ₁₅ R ₁₆ and SiR ₁₇ R ₁₈ ,

A ₁ to A ₂ are the same or different and are a double bond or a combination of two or more independently selected from the group consisting of CR ₁₉ R ₂₀ , a substituted or unsubstituted aryl group having 5 to 50 carbon atoms, a substituted or unsubstituted arylamine group having 5 to 30 carbon atoms , A substituted or unsubstituted heteroaryl group having 3 to 50 carbon atoms, and a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms,

B ₁ to B ₄ are the same or different from each other and are a single bond, or independently of one another, CR ₂₁ R ₂₂ , a substituted or unsubstituted alkyl group having 1 to 24 carbon atoms, a substituted or unsubstituted alkenyl group having 3 to 24 carbon atoms, Or an unsubstituted C1-C30 alkynyl group, a substituted eh is an unsubstituted C1-C50 aryl group, a substituted or unsubstituted C1-C30 substituted or unsubstituted C1-C30 arylamine group, a substituted or unsubstituted C1- A substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms,

R ₁ to R ₂₂ are the same or different from each other and each represents a hydrogen atom, a heavy hydrogen atom, a carbonyl group, a phosphoryl group, an amino group, a thiol group, a cyano group, a hydroxyl group, a nitro group, Substituted or unsubstituted C1-C30 alkyl group, substituted or unsubstituted C3-C30 cycloalkyl group, substituted or unsubstituted C2-C30 heterocycloalkyl group, substituted or unsubstituted C1-C30 alkoxy group, substituted or unsubstituted C6- A substituted or unsubstituted aryloxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylthioxy group having 1 to 30 carbon atoms, a substituted or unsubstituted arylthioxy group having 5 to 30 carbon atoms, a substituted or unsubstituted alkylamine group having 1 to 30 carbon atoms, Or an unsubstituted arylamine group having 5 to 30 carbon atoms, a substituted or unsubstituted aryl group having 5 to 50 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 50 carbon atoms, A substituted or unsubstituted aryl group having 5 to 50 carbon atoms in which at least one of the substituted or unsubstituted cycloalkyl of 3 to 30 carbon atoms is fused, a substituted or unsubstituted C2 to C30 cycloalkyl, To 50 heteroaryl groups and substituted or unsubstituted silyl groups,

n ₁ to n ₄ , o and p are the same as or different from each other, and each independently is an integer of from 1 to 4.

R ₁ to R ₂₂ may further be substituted with one or more substituents, and the one or more substituents may be selected from the group consisting of hydrogen, deuterium, substituted or unsubstituted alkyl groups having 1 to 30 carbon atoms, substituted or unsubstituted C2- A substituted or unsubstituted C2-C30 alkynyl group, a substituted or unsubstituted C2-C30 alkynyl group, a substituted or unsubstituted C3-C30 cycloalkyl group, a substituted or unsubstituted C2-C30 heterocycloalkyl group, A substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, A substituted or unsubstituted alkylamine group having 1 to 30 carbon atoms, a substituted or unsubstituted arylamine group having 5 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 5 to 30 carbon atoms, A substituted or unsubstituted aryl group having 5 to 50 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 50 carbon atoms, a substituted or unsubstituted silyl group, a substituted or unsubstituted germanium group, a substituted or unsubstituted boron group, An amino group, a thiol group, a cyano group, a hydroxy group, a nitro group, a halogen group, a selenium group, a tellurium group, an amide group, an ether group and an ester group.

In the present invention, examples of the substituents will be specifically described below, but the present invention is not limited thereto.

In the present invention, the alkyl group may be linear or branched, and the number of carbon atoms is not particularly limited, but is preferably 1 to 50. Specific examples include methyl, ethyl, propyl, n-propyl, isopropyl, butyl, n-butyl, isobutyl, Ethyl, propyl, isopropyl, n-butyl, isobutyl, isobutyl, isobutyl, A tert-butyl group, a tert-butyl group, a 2-pentyl group, a 3,3-dimethylbutyl group, a 2-ethylbutyl group, a heptyl group, Ethylhexyl group, 2-propylpentyl group, n-nonyl group, 2,2-dimethylheptyl group, 1-ethyl-propyl group, 1,1-dimethyl-propyl group , Isohexyl group, 2-methylpentyl group, 4-methylhexyl group, 5-methylhexyl group and the like, but are not limited thereto.

In the present invention, the alkoxy group may be linear or branched. The number of carbon atoms of the alkoxy group is not particularly limited, but is preferably in the range of 1 to 30, which does not cause steric hindrance. Specific examples thereof include a methoxy group, an ethoxy group, an n-propoxy group, an isopropoxy group, an i-propyloxy group, a n-butoxy group, an isobutoxy group, a tert- , Neopentyloxy group, isopentyloxy group, n-hexyloxy group, 3,3-dimethylbutyloxy group, 2-ethylbutyloxy group, n-octyloxy group, n- , A benzyloxy group, a p-methylbenzyloxy group, and the like, but are not limited thereto.

In the present invention, the alkenyl group may be straight-chain or branched, and the number of carbon atoms is not particularly limited, but is preferably 2 to 40. Specific examples include a vinyl group, a 1-propenyl group, an isopropenyl group, a 1-butenyl group, a 2-butenyl group, a 3-butenyl group, a 1-pentenyl group, a 2-pentenyl group, a 3-pentenyl group, 2-phenylvinyl-1-yl group, 2,2-diphenylvinyl-1-yl group, 2-phenyl-2-yl group, But are not limited to, - (naphthyl-1-yl) vinyl-1-yl group, 2,2-bis (diphenyl-1-yl) vinyl-1-yl group, stilbenyl group, styrenyl group and the like.

In the present invention, the aryl group may be monocyclic or polycyclic, and the number of carbon atoms is not particularly limited, but is preferably 6 to 60. [ Examples of the monocyclic aryl group include a phenyl group, a biphenyl group, a terphenyl group and a stilbene group. Examples of the polycyclic aryl group include a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, a perylenyl group, , A chlorenyl group, a fluorenyl group, an acenaphthacenyl group, a triphenylene group, and a fluororanthrene group, but the scope of the present invention is not limited to these examples.

In the present invention, the heteroaryl group is a hetero ring group containing O, N or S as a heteroatom, and the number of carbon atoms is not particularly limited, but is preferably 2 to 60 carbon atoms. Examples of the heterocyclic group include a thiophene group, a furane group, a furyl group, an imidazole group, a thiazole group, an oxazole group, an oxadiazole group, a triazole group, a pyridyl group, a bipyridyl group, a pyrimidyl group, A pyridazinyl group, a pyrazinopyrazinyl group, an isoquinoline group, a pyrazinyl group, a pyrazinyl group, a pyrazinyl group, a pyrazinyl group, a quinolinyl group, a quinazolinyl group, a quinoxalinyl group, a phthalazinyl group, a pyridopyrimidinyl group, , An indole group, a carbazole group, a benzoxazole group, a benzoimidazole group, a benzothiazole group, a benzocarbazole group, a benzothiophene group, a dibenzothiophene group, a benzofuranyl group, a dibenzofurancyl group, a phenanthroline group, An isothiazolyl group, an isoxazolyl group, an oxadiazolyl group, a thiadiazolyl group, a benzothiazolyl group, a phenothiazinyl group and the like, but is not limited thereto.

In the present invention, the aryl group in the aryloxy group, arylthioxy group, arylsulfoxy group and aralkylamine group is the same as the aforementioned aryl group. Specific examples of the aryloxy group include a phenoxy group, a p-tolyloxy group, an m-tolyloxy group, a 3,5-dimethyl-phenoxy group, a 2,4,6-trimethylphenoxy group, a ptert- Anthryloxy group, 2-naphthyloxy group, 2-naphthyloxy group, 4-methyl-1-naphthyloxy group, Anthryloxy group, 9-anthryloxy group, 1-phenanthryloxy group, 3-phenanthryloxy group, 9-phenanthryloxy group and the like. Examples of the arylthioxy group include phenylthioxy group, 2- A 4-tert-butylphenyloxy group, and the like. Examples of the arylsulfoxy group include benzene sulfoxy group and p-toluenesulfoxy group. However, the present invention is not limited thereto.

In the present invention, the cycloalkyl group is not particularly limited, but preferably has 3 to 60 carbon atoms, and specifically includes cyclopropyl group, cyclobutyl group, cyclopentyl group, 3-methylcyclopentyl group, 2,3-dimethylcyclopentyl group, Methylcyclohexyl group, 2,3-dimethylcyclohexyl group, 3,4,5-trimethylcyclohexyl group, 4-tert-butylcyclohexyl group, cycloheptyl group, cyclo An octyl group, and the like, but are not limited thereto.

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

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

Specific examples of the arylamine group include a phenylamine group, a naphthylamine group, a biphenylamine group, an anthracenylamine group, a 3-methylphenylamine group, a 4-methylnaphthylamine group, But are not limited to, an amine group, a 9-methyl-anthracenylamine group, a diphenylamine group, a phenylnaphthylamine group, a ditolylamine group, a phenyltolylamine group, a carbazole group and a triphenylamine group.

In the present invention, the silyl group is specifically exemplified by trimethylsilyl, triethylsilyl, t-butyldimethylsilyl, vinyldimethylsilyl, propyldimethylsilyl, triphenylsilyl, diphenylsilyl, But are not limited thereto.

In the present invention, the heteroaryl group in the heteroarylamine group can be selected from the examples of the above-mentioned heterocyclic group.

In the present invention, the alkyloxy group in the alkylthio group and the alkyl group in the alkylsulfoxy group are the same as the aforementioned alkyl groups. Specific examples of the alkyloxy group include a methylthio group, an ethylthio group, a tert-butylthio group, a hexylthio group and an octylthio group. Examples of the alkylsulfoxy group include a mesyl group, an ethylsulfoxy group, a propylsulfoxy group, But are not limited thereto.

In the present invention, the substituted arylene group means a phenyl group, a biphenyl group, a naphthalene group, a fluorenyl group, a pyrenyl group, a phenanthrenyl group, a perylene group, a tetracenyl group. Anthracenyl group and the like are substituted with other substituents.

In the present invention, the substituted heteroarylene group includes a pyridyl group, a thiophenyl group, a triazine group, a quinoline group, a phenanthroline group, an imidazole group, a thiazole group, an oxazole group, a carbazole group and condensed heterocyclic groups, Such as a benzoquinoline group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzzcarbazole group, a dibenzothiophenyl group, a dibenzofurane group and the like are substituted with other substituents.

In the present invention, the "substituted or unsubstituted" means a group selected from the group consisting of deuterium, halogen, nitrile, nitro, hydroxy, alkyl, cycloalkyl, , An arylsulfoxy group, an alkenyl group, a silyl group, a boron group, an alkylamine group, an aralkylamine group, an arylamine group, an aryl group, a fluorenyl group, a carbazole group and at least one of N, O and S atoms Substituted or unsubstituted with at least one substituent in the heterocyclic group.

The organic luminescent compound according to the present invention represented by the above-mentioned formulas (I) to (VIII) can be used as an organic material layer of an organic electroluminescent device due to its structural specificity. More specifically, a hole transport material alone, And can be used as a doping material of a transporting material.

Specific preferred examples of the compounds represented by formulas (I) to (VIII) according to the present invention include the compounds represented by the following compounds 1 to 252, but are not limited thereto.

The organic luminescent compound according to the present invention represented by the above-mentioned formulas (I) to (VIII) can be used as an organic material layer of an organic electroluminescent device due to its structural specificity. More specifically, Or a doping material.

In particular, according to a preferred embodiment of the present invention, the organic luminescent compound according to the present invention is used as a doping material of a hole transporting compound of a hole transporting layer alone or in a hole transporting layer of an organic electroluminescent device, Excellent efficiency can be obtained.

Further, by introducing various substituents to the core structure having the above structure, it is possible to synthesize an organic luminescent compound having the intrinsic characteristics of the substituent introduced. For example, by introducing a substituent used in a hole injecting layer material, a hole transporting layer material, a light emitting layer material, and an electron transporting layer material used in manufacturing an organic electroluminescent device into the structure, a material meeting the requirements of each organic material layer is manufactured .

Particularly, the organic electroluminescent compound represented by the formulas (I) to (VIII) according to the present invention has a substituent group introduced into the characteristic core structure as described above. As a result, the organic electroluminescent compound Device implementation is possible.

The compound of the present invention can be applied to a device according to a conventional method of manufacturing an organic electroluminescent device.

The organic electroluminescent device according to one embodiment of the present invention may have a structure including a first electrode, a second electrode and an organic material layer disposed therebetween, and the organic electroluminescent compound according to the present invention may be used for an organic material layer And can be manufactured using conventional device manufacturing methods and materials.

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

Therefore, in the organic electroluminescent device of the present invention, the organic material layer may be a hole injecting layer, a hole transporting layer, an electron transporting layer, an electron injecting layer, a layer simultaneously injecting and transporting holes, a layer simultaneously performing electron injection and electron transporting, One or more layers may be included, and at least one of the layers may include a compound represented by the above formulas (I) to (VIII).

In the organic compound layer having such a multi-layer structure, the compound represented by the above formulas (I) to (VIII) may be used in combination with a light emitting layer, a layer which simultaneously transports holes and holes, a layer which simultaneously transports holes and light, And the like.

For example, the structure of an organic electronic device according to the present invention is illustrated in Figs.

1 shows an organic electronic device in which an anode 2, a hole injecting layer 3, a hole transporting layer 4, a light emitting layer 5, an electron transporting layer 6 and a cathode 7 are sequentially laminated on a substrate 1 Structure is illustrated. In such a structure, the compounds represented by the formulas (I) to (VIII) may be included in the hole injection layer (3), the hole transport layer (4), the light emitting layer (5) or the electron transport layer (6).

2 shows the structure of an organic electronic device in which an anode 2, a hole injecting layer 3, a hole transporting layer 4, a light emitting layer 5 and a cathode 7 are sequentially laminated on a substrate 1. In such a structure, the compounds represented by the formulas (I) to (VIII) may be included in the hole injection layer (3), the hole transport layer (4), or the electron transport layer (6).

3 illustrates the structure of an organic electronic device in which an anode 2, a hole transporting layer 4, a light emitting layer 5, an electron transporting layer 6, and a cathode 7 are sequentially stacked on a substrate 1. In such a structure, the compounds represented by the formulas (I) to (VIII) may be included in the hole transport layer (4), the light emitting layer (5), or the electron transport layer (6).

4 illustrates the structure of an organic electronic device in which an anode 2, a light emitting layer 5, an electron transport layer 6, and a cathode 7 are sequentially laminated on a substrate 1. In FIG. In such a structure, the compounds represented by the formulas (I) to (VIII) may be included in the light-emitting layer (5) or the electron-transporting layer (6).

5 illustrates the structure of an organic electronic device in which an anode 2, a light-emitting layer 5, and a cathode 7 are sequentially stacked on a substrate 1. As shown in Fig. In such a structure, the compound represented by the above formulas (I) to (VIII) may be included in the light emitting layer (5).

For example, the organic electroluminescent device according to the present invention can be manufactured by using a physical vapor deposition (PVD) method such as sputtering or e-beam evaporation to form a metal oxide or a conductive metal oxide on the substrate, An anode is formed by depositing an alloy on the anode, and an organic material layer including a hole injecting layer, a hole transporting layer, a light emitting layer, and an electron transporting layer is formed on the anode, and then a substance usable as a cathode is deposited thereon.

In addition to such a method, an organic electroluminescent device may be formed by sequentially depositing a cathode material, an organic material layer, and a cathode material on a substrate. The organic material layer may have a multi-layer structure including a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer, but is not limited thereto and may have a single layer structure. In addition, the organic material layer may be formed using a variety of polymer materials by a solvent process such as a spin coating process, a dip coating process, a doctor blading process, a screen printing process, an inkjet printing process or a thermal transfer process, Layer.

As the anode material, a material having a large work function is preferably used so that hole injection can be smoothly conducted into the organic material layer. Specific examples of the cathode material that can be used in the present invention include metals such as vanadium, chromium, copper, zinc and gold or alloys thereof, zinc oxide, indium oxide, indium tin oxide (ITO), indium zinc oxide (IZO) metal oxides, ZnO: Al or SnO _2: a combination of a metal and an oxide such as Sb, poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene] (PEDT) , Conductive polymers such as polypyrrole and polyaniline, but are not limited thereto.

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

As the hole injecting material, it is preferable that the highest occupied molecular orbital (HOMO) of the hole injecting material be between the work function of the anode material and the HOMO of the surrounding organic layer. Specific examples of the hole injecting material include metal porphyrine, oligothiophene, arylamine-based organic materials, hexanitrile hexaazatriphenylene, quinacridone-based organic materials, perylene-based organic materials, Anthraquinone, polyaniline and a polythiophene-based conductive polymer, but are not limited thereto.

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

The light emitting material is preferably a material capable of emitting light in the visible light region by transporting and combining holes and electrons from the hole transporting layer and the electron transporting layer, respectively, and having a high quantum efficiency for fluorescence or phosphorescence. Specific examples include 8-hydroxy-quinoline aluminum complex (Alq ₃ ), carbazol-based compounds, dimerized styryl compounds, BAlq, 10-hydroxybenzoquinoline-metal compounds, benzoxazole, benzthiazole and A benzimidazole-based compound, a poly (p-phenylene vinylene) (PPV) -based polymer, a spiro compound, polyfluorene, rubrene, and the like.

As the electron transporting material, a material capable of transferring electrons from the cathode well into the light emitting layer, which is highly mobile, is suitable. Specific examples thereof include, but are not limited to, an Al complex of 8-hydroxyquinoline, a complex containing Alq ₃ , an organic radical compound, and a hydroxyflavone-metal complex.

The organic electroluminescent device according to the present invention may be a front emission type, a back emission type, or a both-sided emission type, depending on the material used.

In addition, the organic electroluminescent compound according to the present invention can act on a principle similar to that applied to an organic electroluminescent device in an organic electronic device including an organic solar cell, an organophotoreceptor, an organic transistor and the like.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are intended to illustrate the invention and are not intended to limit the scope of the invention.

Synthetic example  1: Compound 15 Synthesis

(One) Production Example 1  : Synthesis of Intermediate 15-1

200 mL of acetic acid was added to 2,2 ', 2' '- (cyclopropane-1,2,3-triylidene) trimalononitrile (20 g, 0.087 mol, yurii) and hydrochloric acid (10 mL, Sigma aldrich) And the mixture was refluxed and stirred. After cooling the reaction mixture, the resulting precipitate was filtered and washed with methanol. The resulting solid was recrystallized from toluene to obtain 16.5 g (yield: 82.5%) of <Intermediate 15-1>.

(2) Manufacturing example  2: Synthesis of intermediate 15-2

250 mL methanol was added to intermediate 15-1 (14.83 g, 0.078 mol), ethene-1,1,2,2-tetracarbonitrile (5 g, 0.039 mol, yuri) and caesium hydroxide (11.7 g, 0.078 mol, Sigma aldrich) And the mixture was stirred under reflux for 24 hours. After cooling the reaction mixture, the resulting precipitate was filtered and washed with methanol. The resulting solid was purified by column (EA: Hexane) using silica to obtain 8 g (yield: 43.2%) of Intermediate 15-2.

(3) Manufacturing example  3: Synthesis of compound 15

(3.413 g, 0.003 mol, yuri), zinc cyanide (4.162 g, 0.035 mol, Sigma aldrich), and Pd (PPh ₃ ) ₄ ( ₄ g, 0.033 mol) Was placed in a reaction flask, vacuum-dried, and then filled with nitrogen gas. N-Methyl-2-pyrrolidone (150 mL) was added to the reaction flask to dissolve the compounds, followed by refluxing and stirring for 5 hours. After completion of the reaction, the reaction mixture was cooled, and the resulting precipitate was filtered and washed with methanol. The obtained solid powder was subjected to silica / celite filtration with toluene and then recrystallized to obtain 4.1 g (yield: 75.8%) of Compound 15.

1 H-NMR (200 MHz, CDCl 3):? Ppm, 2H (9.69 / s)

LC / MS: m / z = 366 [(M + 1) ^&lt; ^{+ &}

Synthetic example  2: Compound 72 Synthesis

(One) Manufacturing example  1: Synthesis of intermediate 72-1

9.5 g (yield: 42.1%) of <Intermediate 72-1> was obtained using the same method as the synthesis of Intermediate 15-2.

(2) Production Example 2: Synthesis of Compound 72

6.3 g (yield: 72.5%) of Compound 72 was obtained using the same method as the synthesis of Intermediate 15-3.

1 H-NMR (200 MHz, CDCl 3):? Ppm, 2H (9.69 / s)

LC / MS: m / z = 514 [(M + 1) ^&lt; ^{+ &}

Synthetic example  3: Compound 73 Synthesis

(One) Manufacturing example  1: Synthesis of intermediate 73-1

<Intermediate 73-1> was synthesized in the same manner as in the synthesis of Intermediate 15-2, except that 4-amino-6-bromopyrimidin-5-ol was used instead of 5-amino-6-bromopyrimidin- 9.5 g (Yield: 42.1%).

(2) Manufacturing example  2: Synthesis of Compound 73

Using the same method as the synthesis of the compound 15, 6.3 g (yield: 72.5%) of Compound 73 was obtained.

1 H-NMR (200 MHz, CDCl 3):? Ppm, 2H (9.69 / s)

LC / MS: m / z = 514 [(M + 1) ^&lt; ^{+ &}

Synthetic example  4: Compound 134 Synthesis

(One) Manufacturing example  One : Intermediate 134 Synthesis of -1

Except that 2,2 ', 2' '- (cyclopropane-1,2,3-triylidene) trimalononitrile was used instead of 2,2' - (perfluorocyclohexa-2,5-diene-1,4-diylidene) dimalononitrile 8.1 g (yield: 26.6%) of Intermediate 134-1 was obtained using the same method as the synthesis of Intermediate 15-2.

(2) Manufacturing example  2: Synthesis of Compound 134

3.2 g (yield: 48.57%) of Compound 134 was obtained using the same method as that of Compound 15 above.

1 H-NMR (200 MHz, CDCl 3):? Ppm, 3H (9.69 / s)

LC / MS: m / z = 585 [(M + 1) ^&lt; ^{+ &}

Synthetic example  5: Compound 135 Synthesis

(One) Manufacturing example  1: Synthesis of intermediate 135-1

12.3 g (yield: 67.47%) of Intermediate 135-1 was obtained using the same method as the synthesis of Intermediate 15-2.

(2) Manufacturing example  2: Synthesis of Compound 135

5.1 g (yield: 72.2%) of compound 135 was obtained using the same method as that for compound 15 above.

1 H-NMR (200 MHz, CDCl 3):? Ppm, 3H (9.69 / s)

LC / MS: m / z = 585 [(M + 1) ^&lt; ^{+ &}

Synthetic example  6: Compound 173 Synthesis

(One) Manufacturing example  1: Synthesis of intermediate 173-1

9.2 g (yield: 75.64%) of <Intermediate 173-1> was obtained in the same manner as in the synthesis of the compound 15.

(2) Manufacturing example  2: Synthesis of intermediate 173-2

Intermediate 173-2 (12.3 g, 0.073 mol), 5,10-dibromopyrazino [2,3-g] quinoxaline (10 g, 0.029 mol, slurry), 1,1,1,3,3,3-hexamethyldisilazane g, 0.003 mol, TCI), Pd (PPh 3) 4 (tetrakis (triphenylphosphine) palladium (0)) (1.7 g, 0.0014 mol, sigma aldrich) a mixture of 1,4-dioxane 250 mL and the mixture was stirred under reflux for 4 hours . After cooling the reaction mixture, the resulting precipitate was filtered and washed with methanol. The obtained solid was recrystallized from toluene to obtain 11.3 g (yield: 74.9%) of Intermediate 173-2.

(3) Manufacturing example  3: Synthesis of Compound 173

7.7 g (Yield: 77.3%) of Compound 173 was obtained in the same manner as in the synthesis of Intermediate 15-1.

? H-NMR (200 MHz, CDCl3)? Ppm, 2H (8.11 / s, 7.50 / s, 7.39 /

LC / MS: m / z = 510 [(M + 1) ^&lt; ^{+ &}

Synthetic example  7: Compound 175 Synthesis

(One) Manufacturing example  1: Synthesis of intermediate 175-1

100 mL of tetrahydrofuran was added to 2,3,7,8-tetrafluoropyrazino [2,3-g] quinoxaline-5,10-dione (10 g, 0.035 mol, yurii) and stirred with an ice bath at 0 ° C I gave it away. LiAlH ₄ (2.93 g, 0.077 mol, Sigma aldrich) was slowly added, and after the injection, the temperature was raised to room temperature and stirred for 3 hours. After completion of the reaction, PBr ₃ was added thereto, followed by reflux stirring for 1 hour. After completion of the reaction, the reaction product was washed with distilled water and extracted with ethyl acetate to collect an organic layer. The solvent was removed by distillation under reduced pressure, and the obtained residue was washed with methanol. Toluene recrystallization gave 8 g (yield: 78.9%) of intermediate 173-1.

(2) Production Example 2: Synthesis of Compound 175

11.3 g (Yield: 80.36%) of Compound 175 was obtained using the same method as the synthesis of Intermediate 173-2.

1 H-NMR (200 MHz, CDCl 3):? Ppm, 2H (6.3 / s)

LC / MS: m / z = 456 [(M + 1) ^&lt; ^{+ &}

P-doping device Example

In the embodiment according to the present invention, the ITO transparent electrode is formed by patterning an ITO glass substrate having an ITO transparent electrode on a glass substrate of 25 mm x 25 mm x 0.7 mm so as to have a light emitting area of 2 mm x 2 mm And then washed. After the substrate was mounted in a vacuum chamber and the base pressure was adjusted to 1 × 10 ^-6 torr, organic matter and metal were deposited on the ITO by the following structure.

Device Embodiments 1 to 6

A blue light emitting organic electroluminescent device having the following device structure was manufactured using the compound of the present invention as a doping compound of a hole transporting material and the luminescent characteristics including the luminescent efficiency were measured.

Electron transport layer (201: Liq 30 nm) / LiF (1 nm) / Al (a-NPB: compound doped according to the present invention 100 nm) / electron blocking layer (10 nm) / light emitting layer (100 nm)

A hole transport layer was formed on the ITO transparent electrode using a-NPB. At this time, the compound of Formula 15, 44, 72, 121, 134 and 166 according to the present invention was doped with 2 to 10% (5% in this device). The hole blocking layer was formed to a thickness of 10 nm by using [EBL1]. Further, an electron transport layer (doped with Liq 50% of the following compound [201]) was further formed in the light emitting layer so as to have a thickness of about 20 nm by using [BH1] as a host compound and [BD1] 30 nm, LiF 1 nm and aluminum 100 nm were deposited by vapor deposition to produce an organic electroluminescent device.

Device Comparative Example 1

An organic electroluminescent device for Device Comparison Example 1 was fabricated in the same manner except that P-doping was not used in the device structure of Example 1 above.

Device Comparative Example 2

An organic electroluminescent device for Device Comparison Example 2 was fabricated in the same manner as in Example 1 using F4TCNQ as a P-doping material.

EXPERIMENTAL EXAMPLE 1: Luminescent characteristics of element embodiments 1 to 6

The voltage, current and luminous efficiency of the organic EL device were measured using a source meter (Model 237, Keithley) and a luminance meter (PR-650, Photo Research). The current density was 10 mA / Is defined as "driving voltage" The results are shown in Table 1 below.

Example P-doped material V cd / A QE (%) CIEx CIEy One Formula 15 4.32 8.10 7.59 0.145 0.153 2 44 4.34 8.05 7.55 0.145 0.152 3 (72) 4.28 8.16 7.48 0.145 0.152 4 Formula 121 4.24 8.20 7.54 0.145 0.152 5 (134) 4.25 8.13 7.50 0.145 0.154 6 166 4.30 8.18 7.60 0.146 0.152 Comparative Example 1 not used 6.45 4.5 3.8 0.144 0.156 Comparative Example 2 F4TCNQ 4.7 7.5 6.1 0.147 0.156

When the P-doped material according to the present invention is applied to a compound device, the emission efficiency, the quantum efficiency, and the like of the conventional device (comparative example) It can be confirmed that the luminescent properties are remarkably excellent.

[? -NPB] [EBL1] [BH1] [BD1]     [201]

Fusion type device Embodiment

In the embodiment according to the present invention, the ITO transparent electrode is formed by patterning an ITO glass substrate having an ITO transparent electrode on a glass substrate of 25 mm x 25 mm x 0.7 mm so as to have a light emitting area of 2 mm x 2 mm And then washed. After the substrate was mounted in a vacuum chamber and the base pressure was adjusted to 1 × 10 ^-6 torr, organic matter and metal were deposited on the ITO by the following structure.

Device Embodiments 6 to 12

A blue light emitting organic electroluminescent device having the following device structure was manufactured using the compound implemented according to the present invention as a hole transporting material, and the luminescent characteristics including the luminous efficiency were measured.

Electron transport layer (201: Liq 30 nm) / LiF (1 nm) / Al (100 nm) / ITO / fusion type hole transporting layer (invention compound 60 nm) / electron blocking layer (10 nm)

The ITO transparent electrode was formed to have a thickness of 60 nm using Formulas 73, 135, 173, 175, 206 and 209 according to the present invention. The hole blocking layer was formed to a thickness of 10 nm by using [EBL1]. Further, an electron transport layer (doped with Liq 50% of the following compound [201]) was further formed in the light emitting layer so as to have a thickness of about 20 nm by using [BH1] as a host compound and [BD1] 30 nm, LiF 1 nm and aluminum 100 nm were deposited by vapor deposition to produce an organic electroluminescent device.

Device Comparative Example 1

The organic electroluminescent device for Device Comparative Example 1 was fabricated in the same manner as in Example 7 using F4TCNQ instead of the compound according to the present invention.

EXPERIMENTAL EXAMPLE 2: Luminescent characteristics of device examples 7 to 12

The voltage, current and luminous efficiency of the organic EL device were measured using a source meter (Model 237, Keithley) and a luminance meter (PR-650, Photo Research). The current density was 10 mA / Is defined as "driving voltage" The results are shown in Table 2 below.

Example Hole transport material V cd / A QE (%) CIEx CIEy One Formula 73 6.0 5.0 4.3 0.145 0.152 2 (135) 5.7 5.2 4.5 0.145 0.152 3 173 5.8 5.5 4.2 0.145 0.151 4 Formula 175 5.6 5.1 4.0 0.144 0.152 5 Formula 206 5.5 5.7 4.7 0.145 0.152 6 209 6.0 5.3 4.6 0.145 0.152 Comparative Example 1 F4TCNQ 7.2 3.8 3.1 0.147 0.156

When the P-doping material according to the present invention is applied to the hole transporting material of the hole transporting layer, the light emitting properties such as the light emitting efficiency and the quantum efficiency are remarkably higher than those of the conventional device (comparative example) It can be confirmed that it is excellent.

[? -NPB] [EBL1] [BH1] [BD1]     [201]

Claims (7)

A compound represented by any of the following formulas (I) to (VIII):
(I) &lt; RTI ID = 0.0 &gt; (II)

[Formula III] [Formula IV]

[Formula V] &lt; EMI ID =

[Formula VII] [Formula VIII]

In the above formulas (I) to (VIII)
X ₁ to X ₇ are the same or different and each independently selected from N, O, S, C, CR ₁₃ , NR ₁₄ , CR ₁₅ R ₁₆ and SiR ₁₇ R ₁₈ ,
A ₁ to A ₂ are the same or different and are a double bond or a combination of two or more independently selected from the group consisting of CR ₁₉ R ₂₀ , a substituted or unsubstituted aryl group having 5 to 50 carbon atoms, a substituted or unsubstituted arylamine group having 5 to 30 carbon atoms , A substituted or unsubstituted heteroaryl group having 3 to 50 carbon atoms, and a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms,
B ₁ to B ₄ are the same or different from each other and are a single bond, or independently of one another, CR ₂₁ R ₂₂ , a substituted or unsubstituted alkyl group having 1 to 24 carbon atoms, a substituted or unsubstituted alkenyl group having 3 to 24 carbon atoms, Or an unsubstituted C1-C30 alkynyl group, a substituted eh is an unsubstituted C1-C50 aryl group, a substituted or unsubstituted C1-C30 substituted or unsubstituted C1-C30 arylamine group, a substituted or unsubstituted C1- A substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms,
R ₁ to R ₂₂ are the same or different from each other and each represents a hydrogen atom, a heavy hydrogen atom, a carbonyl group, a phosphoryl group, an amino group, a thiol group, a cyano group, a hydroxyl group, a nitro group, Substituted or unsubstituted C1-C30 alkyl group, substituted or unsubstituted C3-C30 cycloalkyl group, substituted or unsubstituted C2-C30 heterocycloalkyl group, substituted or unsubstituted C1-C30 alkoxy group, substituted or unsubstituted C6- A substituted or unsubstituted aryloxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylthioxy group having 1 to 30 carbon atoms, a substituted or unsubstituted arylthioxy group having 5 to 30 carbon atoms, a substituted or unsubstituted alkylamine group having 1 to 30 carbon atoms, Or an unsubstituted arylamine group having 5 to 30 carbon atoms, a substituted or unsubstituted aryl group having 5 to 50 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 50 carbon atoms, A substituted or unsubstituted aryl group having 5 to 50 carbon atoms in which at least one of the substituted or unsubstituted cycloalkyl of 3 to 30 carbon atoms is fused, a substituted or unsubstituted C2 to C30 cycloalkyl, To 50 heteroaryl groups and substituted or unsubstituted silyl groups,
n ₁ to n ₄ , o and p are the same as or different from each other, and each independently is an integer of from 1 to 4. The method according to claim 1,
The organic electroluminescent compound represented by the above formulas (I) to (VIII) is characterized in that it is selected from the following compounds 1 to 252:

1. An organic electroluminescent device comprising a first electrode, a second electrode, and at least one organic material layer disposed between the first electrode and the second electrode,
Wherein at least one of the organic material layers comprises any one compound selected from the group consisting of compounds represented by formulas (I) to (VIII) according to claim 1. The method of claim 3,
Wherein the organic material layer includes at least one of a hole injecting layer, a hole transporting layer, a layer simultaneously transporting holes and holes, an electron transporting layer, an electron injecting layer, a layer that simultaneously transports electrons and electrons,
Wherein at least one of the layers comprises any one compound selected from the group consisting of compounds represented by the formulas (I) to (VIII). 5. The method of claim 4,
Wherein the hole injecting layer, the hole transporting layer, or the layer simultaneously injecting the holes and transporting the hole transporting compound comprises any one compound selected from the compounds represented by the formulas (I) to (VIII). 6. The method of claim 5,
Wherein the hole transport layer comprises any one compound selected from compounds represented by Formulas (I) to (VIII). The method of claim 3,
Wherein at least one of the organic light emitting layers emitting red, green or blue light is further included in the organic material layer to emit white light.

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