CN113260608A - Novel compound and organic light emitting device comprising same - Google Patents

Novel compound and organic light emitting device comprising same Download PDF

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CN113260608A
CN113260608A CN202080007600.4A CN202080007600A CN113260608A CN 113260608 A CN113260608 A CN 113260608A CN 202080007600 A CN202080007600 A CN 202080007600A CN 113260608 A CN113260608 A CN 113260608A
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CN113260608B (en
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徐尚德
李东勋
张焚在
金旼俊
郑珉祐
李征夏
韩修进
朴瑟灿
黄晟现
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LG Chem Ltd
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Abstract

The present invention provides a novel compound and an organic light emitting device including the same.

Description

Novel compound and organic light emitting device comprising same
Technical Field
Cross reference to related applications
The present application claims priority based on korean patent application No. 10-2019-0142727 at 11/8/2019 and korean patent application No. 10-2020-0137961 at 10/23/2020, the entire contents of which are incorporated herein by reference.
The present invention relates to a novel compound and an organic light emitting device comprising the same.
Background
In general, the organic light emitting phenomenon refers to a phenomenon of converting electric energy into light energy using an organic substance. An organic light emitting device using an organic light emitting phenomenon has a wide viewing angle, excellent contrast, a fast response time, and excellent luminance, driving voltage, and response speed characteristics, and thus a great deal of research is being conducted.
An organic light emitting device generally has a structure including an anode and a cathode, and an organic layer between the anode and the cathode. In order to improve the efficiency and stability of the organic light emitting device, the organic layer is often formed of a multilayer structure formed of different materials, and may be formed of, for example, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, or the like. With the structure of such an organic light emitting device, if a voltage is applied between the two electrodes, holes are injected from the anode into the organic layer, electrons are injected from the cathode into the organic layer, and when the injected holes and electrons meet, excitons (exiton) are formed, which emit light when they transition to the ground state again.
For organic materials used for the organic light emitting devices as described above, development of new materials is continuously demanded.
Documents of the prior art
Patent document
(patent document 1) Korean patent laid-open No. 10-2000-0051826
Disclosure of Invention
Technical subject
The present invention relates to a novel compound and an organic light emitting device comprising the same.
Means for solving the problems
The present invention provides a compound represented by the following chemical formula 1:
[ chemical formula 1]
Figure BDA0003137861700000021
In the above-described chemical formula 1,
Ar1is C substituted by adamantyl6-60An aryl group, a heteroaryl group,
Ar2is substituted or unsubstituted C6-60An aryl group; or substituted or unsubstituted C containing any one or more heteroatoms selected from N, O and S5-60(ii) a heteroaryl group, wherein,
m and n are each independently an integer of 0 to 7,
R1and R2Each independently is hydrogen; deuterium; substituted or unsubstituted C1-60An alkyl group; substituted or unsubstituted C3-60A cycloalkyl group; substituted or unsubstituted C6-60An aryl group; or substituted or unsubstituted C containing 1 or more heteroatoms selected from N, O and S5-60A heteroaryl group.
In addition, the present invention provides an organic light emitting device, comprising: a first electrode; a second electrode provided to face the first electrode; and 1 or more organic layers between the first electrode and the second electrode, wherein 1 or more of the organic layers contain the compound represented by chemical formula 1.
Effects of the invention
The compound represented by the above chemical formula 1 may be used as a material of an organic layer of an organic light emitting device in which improvement in efficiency, lower driving voltage, and/or improvement in lifetime characteristics may be achieved. In particular, the compound represented by the above chemical formula 1 may be used as a material for hole injection, hole transport, hole injection and transport, light emission, electron transport, or electron injection.
Drawings
Fig. 1 illustrates an example of an organic light-emitting device composed of a substrate 1, an anode 2, a light-emitting layer 3, and a cathode 4.
Fig. 2 illustrates an example of an organic light-emitting device composed of 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.
Fig. 3 illustrates an example of an organic light-emitting device composed of a substrate 1, an anode 2, a hole injection layer 5, a hole transport layer 6, an electron blocking layer 9, a light-emitting layer 7, a hole blocking layer 10, an electron transport layer 8, an electron injection layer 11, and a cathode 4.
Detailed Description
Hereinafter, the present invention will be described in more detail to assist understanding thereof.
The present invention provides a compound represented by the above chemical formula 1.
In the context of the present specification,
Figure BDA0003137861700000031
or
Figure BDA0003137861700000032
Represents a bond to other substituents.
In the present specification, the term "substituted or unsubstituted" means substituted with a substituent selected from deuterium; a halogen group; a nitrile group; a nitro group; a hydroxyl group; a carbonyl group; an ester group; an imide group; an amino group; a phosphine oxide group; an alkoxy group; an aryloxy group; alkylthio radicals (A), (B), (C), (D), (C), (D), (E), (D), (E) and (D)
Figure BDA0003137861700000033
Alkyl thio xy); arylthio radicals (A), (B), (C)
Figure BDA0003137861700000034
Figure BDA0003137861700000035
Aryl thio xy); alkylsulfonyl (
Figure BDA0003137861700000036
Alkyl sulfo xy); arylsulfonyl (
Figure BDA0003137861700000037
Aryl sulfoxy); a silyl group; a boron group; an alkyl group; a cycloalkyl group; an alkenyl group; an aryl group; aralkyl group; an aralkenyl group; an alkylaryl group; an alkylamino group; an aralkylamino group; a heteroaryl amino group; an arylamine group; an aryl phosphine group; or 1 or more substituents of 1 or more heterocyclic groups containing N, O and S atoms, or substituents formed by connecting 2 or more substituents of the above-exemplified substituents. For example, "a substituent in which 2 or more substituents are linked" may be a biphenyl group. That is, the biphenyl group may be an aryl group or may be interpreted as a substituent in which 2 phenyl groups are linked.
In the present specification, the number of carbon atoms of the carbonyl group is not particularly limited, but is preferably 1 to 40. Specifically, the compound may have the following structure, but is not limited thereto.
Figure BDA0003137861700000041
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, the compound may be a compound of the following structural formula, but is not limited thereto.
Figure BDA0003137861700000042
In the present specification, the number of carbon atoms in the imide group is not particularly limited, but is preferably 1 to 25. Specifically, the compound may have the following structure, but is not limited thereto.
Figure BDA0003137861700000043
In the present specification, specific examples of the silyl group include, but are not limited to, a trimethylsilyl group, a triethylsilyl group, a t-butyldimethylsilyl group, a vinyldimethylsilyl group, a propyldimethylsilyl group, a triphenylsilyl group, a diphenylsilyl group, and a phenylsilyl group.
In the present specification, the boron group specifically includes a trimethylboron group, a triethylboron group, a t-butyldimethylboron group, a triphenylboron group, a phenylboron group, and the like, but is not limited thereto.
In the present specification, as examples of the halogen group, there are 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 one embodiment, the alkyl group has 1 to 20 carbon atoms. According to another embodiment, the alkyl group has 1 to 10 carbon atoms. According to another embodiment, the alkyl group has 1 to 6 carbon atoms. Specific examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an n-propyl group, an isopropyl group, a butyl group, an n-butyl group, an isobutyl group, a tert-butyl group, a sec-butyl group, a 1-methylbutyl group, a 1-ethylbutyl group, a pentyl group, an n-pentyl group, an isopentyl group, a neopentyl group, a tert-pentyl group, a hexyl group, a n-hexyl group, a 1-methylpentyl group, a 2-methylpentyl group, a 4-methyl-2-pentyl group, a 3, 3-dimethylbutyl group, a 2-ethylbutyl group, a heptyl group, a n-heptyl group, a 1-methylhexyl group, a cyclopentylmethyl group, a cyclohexylmethyl group, an octyl group, a n-octyl group, a tert-octyl group, a 1-methylheptyl group, a 2-ethylhexyl group, a 2-propylpentyl group, a n-nonyl group, a 2, 2-dimethylheptyl group, a 1-ethyl-propyl group, a 1, 1-dimethyl-propyl group, a 1-propyl group, a tert-pentyl group, a 2-pentyl group, a hexyl, 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 one embodiment, the number of carbon atoms of the alkenyl group is 2 to 20. According to another embodiment, the number of carbon atoms of the alkenyl group is 2 to 10. According to another embodiment, the number of carbon atoms of the above alkenyl group is 2 to 6. Specific examples thereof include, but are not limited to, vinyl, 1-propenyl, isopropenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-methyl-1-butenyl, 1, 3-butadienyl, allyl, 1-phenylethen-1-yl, 2-diphenylethen-1-yl, 2-phenyl-2- (naphthalen-1-yl) ethen-1-yl, 2-bis (biphenyl-1-yl) ethen-1-yl, stilbenyl, and styryl.
In the present specification, the cycloalkyl group is not particularly limited, but is preferably a cycloalkyl group having 3 to 60 carbon atoms, and according to one embodiment, the number of carbon atoms of the cycloalkyl group is 3 to 30. According to another embodiment, the cycloalkyl group has 3 to 20 carbon atoms. According to another embodiment, the number of carbon atoms of the above cycloalkyl group is 3 to 6. Specifically, there may be mentioned, but not limited to, 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.
In the present specification, the aryl group is not particularly limited, but is preferably an aryl group having 6 to 60 carbon atoms, and may be a monocyclic aryl group or a polycyclic aryl group. According to one embodiment, the carbon atom of the aryl groupThe number is 6 to 30. According to one embodiment, the aryl group has 6 to 20 carbon atoms. 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 aromatic group may be a naphthyl group, an anthryl group, a phenanthryl group, a pyrenyl group, a perylenyl group, a perylene group,
Figure BDA00031378617000000613
And a fluorenyl group, but is not limited thereto.
In the present specification, the fluorenyl group may be substituted, and 2 substituents may be substituted for each other
Figure BDA0003137861700000061
And the like. But is not limited thereto.
In the present specification, the heterocyclic group is a heterocyclic group containing 1 or more of O, N, Si and S as heteroatoms, and the number of carbon atoms is not particularly limited, but preferably 2 to 60 carbon atoms. Examples of the heterocyclic group include thienyl, furyl, pyrrolyl, imidazolyl and thiazolyl
Figure BDA0003137861700000062
Figure BDA0003137861700000063
Azolyl group,
Figure BDA0003137861700000064
Diazolyl radical
Figure BDA0003137861700000065
Triazolyl, pyridyl, bipyridyl, pyrimidinyl, triazinyl, triazolyl, acridinyl, pyridazinyl, pyrazinyl, quinolyl, quinazolinyl, quinoxalinyl, phthalazinyl, pyridopyrimidinyl, pyridopyrazinyl, pyrazinopyrazinyl, isoquinolyl, indolyl, carbazolyl, benzobenzoxazinyl
Figure BDA0003137861700000066
Azolyl, benzimidazolyl, benzothiazolyl
Figure BDA0003137861700000067
Benzocarbazolyl, benzothienyl, dibenzothienyl, benzofuranyl, phenanthrolinyl, thiazolyl
Figure BDA0003137861700000068
Different from each other
Figure BDA0003137861700000069
Azolyl group,
Figure BDA00031378617000000610
Diazolyl radical
Figure BDA00031378617000000611
Thiadiazolyl, benzothiazolyl
Figure BDA00031378617000000612
Phenothiazinyl, dibenzofuranyl, and the like, but are not limited thereto.
In the present specification, the aryl group in the aralkyl group, aralkenyl group, alkylaryl group, arylamine group is the same as the above-mentioned examples of the aryl group. In the present specification, the alkyl group in the aralkyl group, the alkylaryl group, and the alkylamino group is the same as the above-mentioned examples of the alkyl group. In the present specification, the heteroaryl group in the heteroarylamine can be applied to the above description about the heterocyclic group. In the present specification, the alkenyl group in the aralkenyl group is the same as the above-mentioned examples of the alkenyl group. In the present specification, the arylene group is a 2-valent group, and the above description of the aryl group can be applied thereto. In the present specification, a heteroarylene group is a 2-valent group, and in addition to this, the above description about a heterocyclic group can be applied. In the present specification, the hydrocarbon ring is not a 1-valent group but is formed by combining 2 substituents, and in addition to this, the above description about the aryl group or the cycloalkyl group can be applied. In the present specification, the heterocyclic group is not a 1-valent group but a combination of 2 substituents, and the above description of the heterocyclic group can be applied.
Preferably, the above chemical formula 1 is represented by the following chemical formula 1-1:
[ chemical formula 1-1]
Figure BDA0003137861700000071
In the chemical formula 1-1,
Ar1、Ar2、m、n、R1and R2As defined above.
Preferably, Ar1May be C substituted by adamantyl6-20The aryl group, for example, may be a phenyl group substituted with an adamantyl group, a biphenyl group substituted with an adamantyl group, or a naphthyl group substituted with an adamantyl group.
Preferably, the above chemical formula 1 may be represented by any one of the following chemical formulas 2-1 to 2-3:
[ chemical formula 2-1]
Figure BDA0003137861700000081
[ chemical formula 2-2]
Figure BDA0003137861700000082
[ chemical formulas 2-3]
Figure BDA0003137861700000083
In the above chemical formulas 2-1 to 2-3,
for Ar2、m、n、R1And R2The description of (a) is the same as the above definition.
Preferably, Ar2May be substituted or unsubstituted C6-20An aryl group; or substituted or unsubstituted C containing any one or more heteroatoms selected from N, O and S5-20The heteroaryl group, more preferably, may be a phenyl group, a biphenyl group, a naphthyl group, a dibenzofuranyl group, a dibenzothiophenyl group or a 9, 9-dimethyl-9H-fluorenyl group.
Preferably, m and n may each independently be 0 or 1.
Preferably, R1And R2May each independently be hydrogen, deuterium, or substituted or unsubstituted C6-20Aryl groups, more preferably, may each independently be hydrogen, deuterium or phenyl.
For example, the above compound may be selected from the following compounds:
Figure BDA0003137861700000101
Figure BDA0003137861700000111
Figure BDA0003137861700000121
Figure BDA0003137861700000131
Figure BDA0003137861700000141
Figure BDA0003137861700000151
Figure BDA0003137861700000161
Figure BDA0003137861700000171
on the other hand, the compound represented by the above chemical formula 1 can be produced by a production method as shown in the following reaction formula 1.
[ reaction formula 1]
Figure BDA0003137861700000181
In the above reaction formula 1, T is halogen, preferably bromine or chlorine, and the definition of other substituents is the same as that described above.
Specifically, the compound represented by the above chemical formula 1 is produced by binding a starting material through a suzuki coupling reaction. Such suzuki coupling reaction is preferably carried out in the presence of a palladium catalyst and a base, and the reactive groups used for the suzuki coupling reaction may be modified according to techniques known in the art. The above-described manufacturing method can be further embodied in the manufacturing examples described later.
In addition, the present invention provides an organic light emitting device comprising the compound represented by the above chemical formula 1. As an example, the present invention provides an organic light emitting device, comprising: a first electrode; a second electrode provided to face the first electrode; and 1 or more organic layers between the first electrode and the second electrode, wherein 1 or more of the organic layers contain the compound represented by chemical formula 1.
The organic layer of the organic light-emitting device of the present invention may have a single-layer structure, or may have a multilayer structure in which 2 or more organic 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, and the like as an organic layer. However, the structure of the organic light emitting device is not limited thereto, and a smaller number of organic layers may be included.
In addition, the organic layer may include a hole injection layer, a hole transport layer, a layer simultaneously performing hole injection and transport, or an electron blocking layer, and the hole injection layer, the hole transport layer, the layer simultaneously performing hole injection and transport, or the electron blocking layer may include the compound represented by the chemical formula 1.
In addition, the organic layer may include a light emitting layer, and the light emitting layer may include the compound represented by the chemical formula 1. At this time, the compound represented by the above chemical formula 1 may be used as a host substance in the light emitting layer, and more specifically, the compound represented by the above chemical formula 1 may be used as a host for the light emitting layer of the green organic light emitting device.
When the light-emitting layer includes 2 or more kinds of hosts, 1 or more kinds of hosts may be the compound.
In addition, the organic layer may include a hole blocking layer, an electron transporting layer, an electron injecting layer, or a layer simultaneously performing electron transport and electron injection, and the hole blocking layer, the electron transporting layer, the electron injecting layer, or the layer simultaneously performing electron transport and electron injection may include the compound represented by the above chemical formula 1.
In addition, the organic light emitting device according to the present invention may be an organic light emitting device of a structure (normal type) in which an anode, 1 or more organic layers, and a cathode are sequentially stacked on a substrate. Further, the organic light emitting device according to the present invention may be an inverted (inverted type) organic light emitting device in which a cathode, 1 or more organic layers, and an anode are sequentially stacked on a substrate. For example, structures of an organic light emitting device according to an embodiment of the present invention are illustrated in fig. 1 to 3.
Fig. 1 illustrates an example of an organic light-emitting device composed of a substrate 1, an anode 2, a light-emitting layer 3, and a cathode 4. In the structure as described above, the compound represented by the above chemical formula 1 may be included in the above light emitting layer.
Fig. 2 illustrates an example of an organic light-emitting device composed of 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. In the structure as described above, the compound represented by the above chemical formula 1 may be contained in 1 or more layers among the above hole injection layer, hole transport layer, light emitting layer, and electron transport layer.
Fig. 3 illustrates an example of an organic light-emitting device composed of a substrate 1, an anode 2, a hole injection layer 5, a hole transport layer 6, an electron blocking layer 9, a light-emitting layer 7, a hole blocking layer 10, an electron transport layer 8, an electron injection layer 11, and a cathode 4. In the structure as described above, the compound represented by the above chemical formula 1 may be included in 1 or more layers among the above hole injection layer, hole transport layer, electron blocking layer, light emitting layer, hole blocking layer, electron transport layer, and 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 1 or more of the above organic layers include the compound represented by the above chemical formula 1. In addition, in the case where the organic light emitting device includes a plurality of organic layers, the organic layers may be formed of the same substance or different substances.
For example, the organic light emitting device according to the present invention may be manufactured by sequentially stacking a first electrode, an organic layer, and a second electrode on a substrate. In this case, the following production can be performed: the organic el display device is manufactured by depositing a metal, a metal oxide having conductivity, or an alloy thereof on a substrate by a PVD (physical Vapor Deposition) method such as a sputtering method or an electron beam evaporation method (e-beam evaporation) method to form an anode, forming an organic layer including a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer on the anode, and then depositing a substance that can be used as a cathode on the organic layer. In addition to this method, a cathode material, an organic layer, and an anode material may be sequentially deposited on a substrate to manufacture an organic light-emitting device.
In addition, the compound represented by the above chemical formula 1 may be formed into an organic layer not only by a vacuum evaporation method but also by a solution coating method in the manufacture of an organic light emitting device. Here, the solution coating method refers to spin coating, dip coating, blade coating, inkjet printing, screen printing, spraying, roll coating, and the like, but is not limited thereto.
In addition to these methods, an organic light-emitting device can be manufactured by depositing a cathode material, an organic layer, and an anode material on a substrate in this order (WO 2003/012890). However, the production method is not limited thereto.
In one example, the first electrode is an anode and the second electrode is a cathode, or the first electrode is a cathode and the second electrode is an anode.
The anode material is preferably a material having a large work function in order to smoothly inject holes into the organic layer. Specific examples of the anode material include metals such as vanadium, chromium, copper, zinc, and gold, and alloys thereof; metal oxides such as zinc oxide, Indium Tin Oxide (ITO), and Indium Zinc Oxide (IZO); ZnO-Al or SnO2A combination of a metal such as Sb and an oxide; poly (3-methylthiophene), poly [3,4- (ethylene-1, 2-dioxy) thiophene]Conductive polymers such as (PEDOT), polypyrrole, and polyaniline, but the present invention is not limited thereto.
The cathode material is preferably a material having a small work function in order to easily inject electrons into the organic layer. Specific examples of the cathode material include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin, and lead, and alloys thereof; LiF/Al or LiO2And a multilayer structure material such as Al, but not limited thereto.
The hole injection layer is a layer for injecting holes from the electrode, and the following compounds are preferable as the hole injection substance: a compound having an ability to transport holes, having an effect of injecting holes from an anode, having an excellent hole injection effect for a light-emitting layer or a light-emitting material, preventing excitons generated in the light-emitting layer from migrating to an electron injection layer or an electron injection material, and having an excellent thin film-forming ability. Preferably, the HOMO (highest occupied molecular orbital) of the hole injecting substance is between the work function of the anode substance and the HOMO of the surrounding organic layer. Specific examples of the hole injecting substance include, but are not limited to, metalloporphyrin (porphyrin), oligothiophene, arylamine-based organic substances, hexanitrile-hexaazatriphenylene-based organic substances, quinacridone-based organic substances, perylene-based organic substances, anthraquinone, polyaniline, and polythiophene-based conductive polymers.
The hole transport layer is a layer that receives holes from the hole injection layer and transports the holes to the light-emitting layer, and the hole transport substance is a substance that can receive holes from the anode or the hole injection layer and transport the holes to the light-emitting layer, and is preferably a substance having a high mobility to holes. Specific examples thereof include, but are not limited to, arylamine-based organic materials, conductive polymers, and block copolymers in which a conjugated portion and a non-conjugated portion are present simultaneously.
The electron blocking layer is formed on the hole transport layer, preferably in contact with the light emitting layer, and serves to prevent excessive electron transfer by adjusting hole mobility, thereby increasing the probability of hole-electron combination, and thus improving the efficiency of the organic light emitting device. The electron blocking layer contains an electron blocking material, and as such an electron blocking material, a material having a stable structure in which electrons are not allowed to flow out of the light-emitting layer is suitable. As a specific example, an arylamine organic substance or the like can be used, but the present invention is not limited thereto.
The light-emitting substance is a substance that can receive holes and electrons from the hole-transporting layer and the electron-transporting layer, respectively, and combine them to emit light in the visible light region, and is preferably a substance having high quantum efficiency with respect to fluorescence or phosphorescence. As an example, there is an 8-hydroxyquinoline aluminum complex (Alq)3) (ii) a A carbazole-based compound; dimeric styryl (dimerized styryl) compounds; BAlq; 10-hydroxybenzoquinoline-metal compounds; benzo (b) is
Figure BDA0003137861700000221
Azole, benzothiazole and benzimidazole-based compounds; poly (p-phenylene vinylene) (PPV) polymers; spiro (spiroo) compounds; a polyfluorene; rubrene, etc., but not limited thereto.
The light emitting layer may include a host material and a dopant material. The host material includes aromatic fused ring derivatives, heterocyclic compounds, and the like. Specifically, the aromatic fused ring derivatives include anthracene derivatives, pyrene derivatives, naphthalene derivatives, pentacene derivatives, phenanthrene compounds, fluoranthene compounds, and the like, and the heterocyclic ring-containing compounds includeCarbazole derivative, dibenzofuran derivative, and ladder-type furan compound
Figure BDA0003137861700000222
Figure BDA0003137861700000223
Pyrimidine derivatives, etc., but are not limited thereto.
As the dopant material, there are an aromatic amine derivative, a styryl amine compound, a boron complex, a fluoranthene compound, a metal complex, and the like. Specifically, the aromatic amine derivative is an aromatic fused ring derivative having a substituted or unsubstituted arylamino group, and includes pyrene, anthracene, or the like having an arylamino group,
Figure BDA0003137861700000224
Diindenopyrene, and the like, and styrylamine compounds are compounds in which at least 1 arylvinyl group is substituted on a substituted or unsubstituted arylamine, and are substituted or unsubstituted with 1 or 2 or more substituents selected from aryl, silyl, alkyl, cycloalkyl, and arylamino groups. Specific examples thereof include, but are not limited to, styrylamine, styryldiamine, styryltrimethylamine, and styryltretramine. The metal complex includes, but is not limited to, iridium complexes, platinum complexes, and the like.
The hole blocking layer is formed on the light emitting layer, and more specifically, the hole blocking layer is provided in contact with the light emitting layer, and prevents excessive hole migration to increase the probability of hole-electron combination, thereby improving the efficiency of the organic light emitting device. The hole-blocking layer contains a hole-blocking substance, and as such a hole-blocking substance, a substance having a stable structure in which holes are not allowed to flow out of the light-emitting layer is suitable. As the above-mentioned hole-blocking substance, azine derivatives including triazine, triazole derivatives, and the like,
Figure BDA0003137861700000231
Introduction of electron-withdrawing group into oxadiazole derivative, phenanthroline derivative, phosphine oxide derivative, or the likeThe compound (4) is not limited thereto.
The electron transporting layer is a layer that receives electrons from the electron injecting layer and transports the electrons to the light emitting layer, and the electron transporting substance is a substance that can favorably receive electrons from the cathode and transfer the electrons to the light emitting layer, and is preferably a substance having a high mobility to electrons. Specific examples thereof include Al complexes of 8-hydroxyquinoline and Al complexes containing Alq3The complex of (a), an organic radical compound, a hydroxyflavone-metal complex, etc., but are not limited thereto. The electron transport layer may be used with any desired cathode material as used in the art. Examples of suitable cathode substances are, in particular, the customary substances having a low work function and accompanied by an aluminum or silver layer. In particular cesium, barium, calcium, ytterbium and samarium, in each case accompanied by an aluminum or silver layer.
The electron injection layer is a layer for injecting electrons from the electrode, and is preferably a compound of: a compound having an ability to transport electrons, having an effect of injecting electrons from a cathode, having an excellent electron injection effect with respect to a light-emitting layer or a light-emitting material, preventing excitons generated in the light-emitting layer from migrating to a hole-injecting layer, and having an excellent thin-film-forming ability. Specifically, there are fluorenone, anthraquinone dimethane, diphenoquinone, thiopyran dioxide, and the like,
Figure BDA0003137861700000232
Azole,
Figure BDA0003137861700000233
Oxadiazole, triazole, imidazole, perylene tetracarboxylic acid, fluorenylidene methane, anthrone, and the like, and derivatives thereof, metal complex compounds, nitrogen-containing five-membered ring derivatives, and the like, but are not limited thereto.
Examples of the metal complex include lithium 8-quinolinolato, zinc bis (8-quinolinolato), copper bis (8-quinolinolato), manganese bis (8-quinolinolato), aluminum tris (2-methyl-8-quinolinolato), and gallium tris (8-quinolinolato), bis (10-hydroxybenzo [ h ] quinoline) beryllium, bis (10-hydroxybenzo [ h ] quinoline) zinc, bis (2-methyl-8-quinoline) gallium chloride, bis (2-methyl-8-quinoline) (o-cresol) gallium, bis (2-methyl-8-quinoline) (1-naphthol) aluminum, bis (2-methyl-8-quinoline) (2-naphthol) gallium, and the like, but are not limited thereto.
The organic light emitting device according to the present invention may be a top emission type, a bottom emission type, or a bi-directional emission type, depending on the material used.
In addition, the compound represented by the above chemical formula 1 may be included in an organic solar cell or an organic transistor, in addition to the organic light emitting device.
The manufacture of the compound represented by the above chemical formula 1 and the organic light emitting device including the same is specifically illustrated in the following examples. However, the following examples are provided to illustrate the present invention, and the scope of the present invention is not limited thereto.
[ production example ]
Production example 1: production of intermediate A
Step 1) production of intermediate A-1
Figure BDA0003137861700000241
After 3-chloro-9H-carbazole (3-chloro-9H-carbazole) (15.0g, 74.4mmol), bromobenzene (12.8g, 81.8mmol), bis (tri-tert-butylphosphine) palladium (0) (bis (tri-tert-butylphosphine) palladium (0)) (0.8g, 1.5mmol), sodium tert-butoxide (10.7g, 111.6mmol), and toluene (toluene) (450ml) were added to the flask, stirring was carried out under reflux for 8 hours under an argon atmosphere. After the reaction, the reaction mixture was cooled to room temperature, water was added, and the reaction mixture was transferred to a separatory funnel and extracted. The extract was washed with MgSO4The intermediate A-1(15.9g) was obtained by drying, concentrating and purifying the sample by silica gel column chromatography. (yield 77%, MS: [ M + H ]]+=278)。
Step 2) production of intermediate A-2
Figure BDA0003137861700000251
Adding into a flaskIntermediate A-1(15.0g, 54.0mmol), bis (pinacolato) diboron (15.1g, 59.4mmol), bis (dibenzylideneacetone) palladium (0) (bis (dibenzylideneacetone) palladium (0)) (0.6g, 1.1mmol), tricyclohexylphosphine (0.6g, 2.2mmol), potassium acetate (potassium acetate) (10.6g, 108.0mmol), and 1, 4-bis (pinacolato)
Figure BDA0003137861700000253
An alkane (1,4-dioxane) (300ml) was stirred under reflux for 12 hours under an argon atmosphere. After the reaction was completed and cooled to room temperature, the reaction solution was transferred to a separatory funnel and extracted with water and ethyl acetate (ethyl acetate). The extract was washed with MgSO4After drying, filtration and concentration, the sample was purified by silica gel column chromatography to obtain intermediate A-2(11.0 g). (yield 55%, MS: [ M + H ]]+=369)。
Step 3) production of intermediate A
Figure BDA0003137861700000252
In a flask, intermediate a-2(15.0g, 40.6mmol), 3-bromo-9H-carbazole (12.0g, 48.7mmol) were dissolved in Tetrahydrofuran (THF) (300ml), and potassium carbonate (potassium carbonate) (22.5g, 162.5mmol) was dissolved in water (150ml) and added. Tetrakis (triphenylphosphine) palladium (0) (tetrakis (triphenylphosphine) palladium (0)) (2.3g, 2.0mmol) was added thereto, and stirred under reflux for 8 hours under an argon atmosphere. After the reaction was completed, the reaction mixture was cooled to room temperature, and then transferred to a separatory funnel using CH2Cl2Extraction is carried out. The extract was washed with MgSO4After drying, filtration and concentration, the sample was purified by silica gel column chromatography to obtain intermediate a (11.8 g). (yield 71%, MS: [ M + H ]]+=409)。
Production example 2: production of intermediate B
Figure BDA0003137861700000261
Intermediate B was produced by the same production method as that of intermediate a except that bromobenzene was changed to 3-bromo-1,1'-biphenyl (3-bromo-1,1' -biphenyl) in production example 1. (MS: [ M + H ]]+=485)。
Production example 3: production of intermediate C
Figure BDA0003137861700000262
Production example 1, the bromobenzene was changed to 2-bromodibenzo [ b, d ]]Thiophene (2-bromodenzo [ b, d ]]thiophene), an intermediate C was produced by the same production method as that of the intermediate a, except that thiolene) was used. (MS: [ M + H ]]+=515)。
Production example 4: production of intermediate D
Figure BDA0003137861700000263
Production example 1, the bromobenzene was changed to 2-bromodibenzo [ b, d ]]Furan (2-bromodenzo [ b, d ]]furan) was used, and except that the intermediate D was produced by the same production method as that of the intermediate a. (MS: [ M + H ]]+=499)
Production example 5: production of intermediate E
Figure BDA0003137861700000271
Intermediate E was produced by the same production method as that of intermediate a except that bromobenzene was changed to 2-bromo-9,9-dimethyl-9H-fluorene (2-bromoo-9, 9-dimethyl-9H-fluorene) in production example 1. (MS: [ M + H ]]+=525)。
Production example 6: production of intermediate F
Figure BDA0003137861700000272
Intermediate F was produced by the same production method as that of intermediate a except that bromobenzene was changed to 2-bromonaphthalene (2-bromonaphthalene) and used in production example 1. (MS: [ M + H ]]+=459)。
Production example 7: production of intermediate G
Figure BDA0003137861700000273
Intermediate G was produced by the same production method as that of intermediate a except that bromobenzene was changed to 4-bromo-1,1'-biphenyl (4-bromo-1,1' -biphenyl) in production example 1. (MS: [ M + H ]]+=485)。
Production example 8: production of intermediate H
Figure BDA0003137861700000281
Intermediate H was produced by the same production method as that of intermediate a except that 3-chloro-9H-carbazole was changed to 2-chloro-9H-carbazole and bromobenzene was changed to 4-bromo-1,1' -biphenyl in production example 1. (MS: [ M + H ]]+=485)。
Production example 9: production of intermediate I
Figure BDA0003137861700000282
Intermediate I was produced by the same production method as that of intermediate a except that 3-chloro-9H-carbazole was changed to 4-chloro-9H-carbazole and 3-bromo-9H-carbazole was changed to 4-chloro-9H-carbazole in production example 1. (MS: [ M + H ]]+=409)。
[ examples ]
Example 1: production of Compound 1
Figure BDA0003137861700000283
To a flask, intermediate a (15.0g, 36.7mmol), intermediate a (11.8g, 40.4mmol), bis (tri-tert-butylphosphine) palladium (0) (0.4g, 0.7mmol), sodium tert-butoxide (5.3g, 55.1mmol), and toluene (300ml) were added, followed by stirring under reflux in an argon atmosphere for 8 hours. After the reaction, the reaction mixture was cooled to room temperature, water was added, and the reaction mixture was transferred to a separatory funnel and extracted. The extract was washed with MgSO4After drying and concentration, the sample was purified by silica gel column chromatography and then purified by sublimation, whereby compound 1(7.3g) was obtained. (yield 32%, MS: [ M + H ]]+=619)。
Example 2: production of Compound 2
Figure BDA0003137861700000291
Compound 2 was produced by the same production method as that of compound 1 except that intermediate a was used instead of intermediate B in example 1. (MS: [ M + H ]]+=695)。
Example 3: production of Compound 3
Figure BDA0003137861700000301
Compound 3 was produced by the same production method as that of compound 1, except that in example 1, intermediate a was used instead of intermediate C. (MS: [ M + H ]]+=725)。
Example 4: production of Compound 4
Figure BDA0003137861700000302
In example 1, intermediate a was used instead of intermediate D, andcompound 4 was produced by the same production method as that of compound 1, except that intermediate a was used instead of intermediate b. (MS: [ M + H ]]+=709)。
Example 5: production of Compound 5
Figure BDA0003137861700000311
Compound 5 was produced by the same production method as that of compound 1, except that in example 1, intermediate a was used instead of intermediate E, and intermediate a was used instead of intermediate b. (MS: [ M + H ]]+=735)。
Example 6: production of Compound 6
Figure BDA0003137861700000312
Compound 6 was produced by the same production method as that of compound 1, except that in example 1, intermediate a was used instead of intermediate F, and intermediate a was used instead of intermediate b. (MS: [ M + H ]]+=669)。
Example 7: production of Compound 7
Figure BDA0003137861700000321
Compound 7 was produced by the same production method as that of compound 1, except that in example 1, intermediate a was used instead of intermediate G, and intermediate a was used instead of intermediate c. (MS: [ M + H ]]+=695)。
Example 8: production of Compound 8
Figure BDA0003137861700000322
In factCompound 8 was produced by the same production method as that of compound 1, except that intermediate a was used instead of intermediate H in example 1. (MS: [ M + H ]]+=695)。
Example 9: production of Compound 9
Figure BDA0003137861700000331
Compound 9 was produced by the same production method as that of compound 1, except that in synthesis example 10, intermediate a was used instead of intermediate I, and intermediate a was used instead of intermediate b. (MS: [ M + H ]]+=619)。
[ Experimental example ]
Experimental example 1
Indium Tin Oxide (ITO) and the like
Figure BDA0003137861700000332
The glass substrate coated with a thin film of (3) is put in distilled water in which a detergent is dissolved, and washed by ultrasonic waves. In this case, the detergent used was a product of fisher (Fischer Co.) and the distilled water used was distilled water obtained by twice filtration using a Filter (Filter) manufactured by Millipore Co. After washing ITO for 30 minutes, ultrasonic washing was performed for 10 minutes by repeating twice with distilled water. After the completion of the distilled water washing, the resultant was ultrasonically washed with a solvent of isopropyl alcohol, acetone, or methanol, dried, and then transported to a plasma cleaning machine. After the substrate was cleaned with oxygen plasma for 5 minutes, the substrate was transported to a vacuum evaporator.
On the ITO transparent electrode thus prepared, the following HT-A compound and 5% by weight of PD compound were added
Figure BDA0003137861700000333
Is subjected to thermal vacuum deposition, followed by deposition of only the following HT-A compounds
Figure BDA0003137861700000334
The hole transport layer is formed by evaporation. On the hole transport layer, as an electron blocking layer, the following HT-B compound and
Figure BDA0003137861700000335
thermal vacuum evaporation is performed to a thickness of (1). Next, the compound 1 produced in example 1 as the first host and the NGH compound as the second host were constituted as a host at a weight ratio of 60:40, and 15 wt% of the GD compound as the dopant and 15 wt% of the host were constituted as the dopant
Figure BDA0003137861700000341
Vacuum evaporation is performed to a thickness of (1). N mutext, as a hole-blocking layer, the following ET-A compound was added
Figure BDA0003137861700000342
Vacuum evaporation is performed to a thickness of (1). Next, as an electron transporting and injecting layer, the following ET-B compound and the following Liq compound were added at a ratio of 2:1 to
Figure BDA0003137861700000343
Is subjected to thermal vacuum deposition, and then LiF and magnesium are mixed at a ratio of 1:1
Figure BDA0003137861700000344
Vacuum evaporation is performed to a thickness of (1). On the electron injection layer, magnesium and silver are added at a ratio of 1:4
Figure BDA0003137861700000345
The cathode is formed by vapor deposition to produce an organic light-emitting device.
Figure BDA0003137861700000346
Experimental examples 2 to 9 and comparative Experimental examples 1 to 3
Organic light-emitting devices of experimental examples 2 to 9 and comparative experimental examples 1 to 3 were produced in the same manner as in experimental example 1, except that the first host material was changed as shown in table 1 below.
Figure BDA0003137861700000351
The organic light emitting devices manufactured in the above experimental examples and comparative experimental examples were applied with 10mA/cm2The current density of (a) was measured for voltage and efficiency, and the resultant was taken out after heat treatment in an oven at 110 ℃ for 10 hours and measured again under the same conditions, and the results are shown in table 1 below.
[ Table 1]
Figure BDA0003137861700000352
As can be seen from table 1 above, it can be seen that when the compound represented by chemical formula 1 according to the present invention is used as the first host of the light emitting layer of the organic light emitting device, the same or more characteristics in terms of voltage, efficiency, etc. are exhibited as compared to the compounds of the comparative examples. In particular, it was confirmed that the device using the compound of the present invention maintained equal or superior characteristics before and after the heat treatment due to excellent thermal characteristics, as compared to the case where the voltage and efficiency characteristics were reduced after the heat treatment of the device using the compound of the comparative example.
Such characteristics of the compound represented by chemical formula 1 according to the present invention are characteristics exhibited by including an adamantane structure, which is a non-planar structure of a molecule in terms of a single molecular structure, compared to a cycloalkyl or aryl structure. In general, a non-planar structure such as an alkyl group having a long chain generates energy loss due to mobility caused by characteristics such as rotational motion or vibrational motion of a molecule, but on the contrary, adamantane, although having characteristics of lowering crystallinity, forms strong condensed rings with each other in space, and thus lowers mobility of a molecule, can have high heat resistance, and can reduce energy loss due to molecular motion. Further, an aryl structure such as a phenyl structure affects the energy level of a molecule due to an delocalized structure, and an adamantane structure does not affect the energy level and contains a large amount of carbon, so that the molecular weight becomes large, the melting point or the glass transition temperature is increased, and thus, the film stability can also be improved.
From the results, when the compound represented by chemical formula 1 according to the present invention is used as a light emitting layer of an organic light emitting device, a device exhibiting characteristics of low voltage, high efficiency, and high heat resistance can be obtained.
Description of the symbols
1: substrate 2: anode
3: light-emitting layer 4: cathode electrode
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: an electron injection layer.

Claims (10)

1. A compound represented by the following chemical formula 1:
chemical formula 1
Figure FDA0003137861690000011
In the chemical formula 1, the first and second organic solvents,
Ar1is C substituted by adamantyl6-60An aryl group, a heteroaryl group,
Ar2is substituted or unsubstituted C6-60An aryl group; or substituted or unsubstituted C containing any one or more heteroatoms selected from N, O and S5-60(ii) a heteroaryl group, wherein,
m and n are each independently an integer of 0 to 7,
R1and R2Each independently is hydrogen; deuterium; substituted or unsubstituted C1-60An alkyl group; substituted or unsubstituted C3-60A cycloalkyl group; substituted or unsubstituted C6-60An aryl group; or substituted or unsubstituted comprising more than 1 selected from N, O and SC of a hetero atom5-60A heteroaryl group.
2. The compound according to claim 1, wherein the chemical formula 1 is represented by the following chemical formula 1-1:
chemical formula 1-1
Figure FDA0003137861690000012
In the chemical formula 1-1,
Ar1、Ar2、m、n、R1and R2As defined in claim 1.
3. The compound of claim 1, wherein Ar1Is phenyl substituted with adamantyl, biphenyl substituted with adamantyl, or naphthyl substituted with adamantyl.
4. The compound according to claim 1, wherein the chemical formula 1 is represented by any one of the following chemical formulae 2-1 to 2-3:
chemical formula 2-1
Figure FDA0003137861690000021
Chemical formula 2-2
Figure FDA0003137861690000022
Chemical formula 2-3
Figure FDA0003137861690000031
In the chemical formulas 2-1 to 2-3,
Ar2、m、n、R1and R2As defined in claim 1.
5. The compound of claim 1, wherein Ar2Is phenyl, biphenyl, naphthyl, dibenzofuranyl, dibenzothienyl or 9, 9-dimethyl-9H-fluorenyl.
6. The compound of claim 1, wherein m and n are each independently 0 or 1.
7. The compound of claim 1, wherein R1And R2Each independently hydrogen, deuterium or phenyl.
8. The compound according to claim 1, wherein the compound represented by the chemical formula 1 is any one selected from the group consisting of:
Figure FDA0003137861690000041
Figure FDA0003137861690000051
Figure FDA0003137861690000061
Figure FDA0003137861690000071
Figure FDA0003137861690000081
Figure FDA0003137861690000091
Figure FDA0003137861690000101
Figure FDA0003137861690000111
9. an organic light emitting device, comprising: a first electrode; a second electrode provided so as to face the first electrode; and an organic layer having 1 or more layers between the first electrode and the second electrode, wherein 1 or more layers of the organic layer contain the compound according to any one of claims 1 to 8.
10. The organic light-emitting device according to claim 9, wherein the organic layer containing the compound is a light-emitting layer.
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