Patent Grant
11133477
This application claims priority to and the benefits of Korean Patent Application No. 10-2016-0087507, filed with the Korean Intellectual Property Office on Jul. 11, 2016, the entire contents of which are incorporated herein by reference.
The present application relates to a hetero-cyclic compound and an organic light emitting device using the same.
An electroluminescent device is one type of self-emissive display devices, and has an advantage of having a wide viewing angle, and a high response speed as well as having an excellent contrast.
An organic light emitting device has a structure disposing an organic thin film between two electrodes. When a voltage is applied to an organic light emitting device having such a structure, electrons and holes injected from the two electrodes bind and pair in the organic thin film, and light emits as these annihilate. The organic thin film may be formed in a single layer or a multilayer as necessary.
A material of the organic thin film may have a light emitting function as necessary. For example, as a material of the organic thin film, compounds capable of forming a light emitting layer themselves may be used alone, or compounds capable of performing a role of a host or a dopant of a host-dopant-based light emitting layer may also be used. In addition thereto, compounds capable of performing roles of hole injection, hole transfer, electron blocking, hole blocking, electron transfer, electron injection and the like may also be used as a material of the organic thin film.
Development of an organic thin film material has been continuously required for enhancing performance, lifespan or efficiency of an organic light emitting device.
U.S. Pat. No. 4,356,429
The present application is directed to providing a novel hetero-cyclic compound and an organic light emitting device using the same.
One embodiment of the present application provides a hetero-cyclic compound represented by the following Chemical Formula 1:
in Chemical Formula 1,
L1 is a direct bond; a substituted or unsubstituted C6 to C60 arylene group; or a substituted or unsubstituted C2 to C60 heteroarylene group,
Z1 is selected from the group consisting of hydrogen; deuterium; a halogen group; —CN; a substituted or unsubstituted C1 to C60 alkyl group; a substituted or unsubstituted C6 to C60 aryl group; a substituted or unsubstituted C2 to C60 heteroaryl group; —SiRR′R″; —P(═O)RR′; and an amine group unsubstituted or substituted with a C1 to C20 alkyl group, a C6 to C60 aryl group or a C2 to C60 heteroaryl group,
m is an integer of 0 to 4,
n is an integer of 1 to 4,
R1 to R8 are the same as or different from each other, and each independently selected from the group consisting of hydrogen; deuterium; a halogen group; —CN; a substituted or unsubstituted C1 to C60 alkyl group; a substituted or unsubstituted C2 to Co alkenyl group; a substituted or unsubstituted C2 to C6 alkynyl group; a substituted or unsubstituted C1 to C60 alkoxy group; a substituted or unsubstituted C3 to C60 cycloalkyl group; a substituted or unsubstituted C2 to C60 heterocycloalkyl group; a substituted or unsubstituted C6 to C60 aryl group; a substituted or unsubstituted C2 to C60 heteroaryl group; —SiRR′R″; —P(═O)RR′; and an amine group unsubstituted or substituted with a C1 to C20 alkyl group, a C6 to C60 aryl group or a C2 to C60 heteroaryl group, or two or more groups adjacent to each other bond to each other to form a substituted or unsubstituted aliphatic or aromatic hydrocarbon ring,
R, R′ and R″ are the same as or different from each other, and each independently hydrogen; deuterium; —CN; a substituted or unsubstituted C1 to C60 alkyl group; a substituted or unsubstituted C3 to C60 cycloalkyl group; a substituted or unsubstituted C6 to C60 aryl group; or a substituted or unsubstituted C2 to C60 heteroaryl group.
Another embodiment of the present application provides an organic light emitting device comprising an anode, a cathode and one or more organic material layers provided between the anode and the cathode, wherein one or more layers of the organic material layers comprise the hetero-cyclic compound represented by Chemical Formula 1.
A hetero-cyclic compound according to one embodiment of the present application can be used as an organic material layer material of an organic light emitting device. The hetero-cyclic compound can be used as a material of a hole injection layer, a hole transfer layer, a light emitting layer, an electron transfer layer, an electron injection layer, a charge generation layer or the like in an organic light emitting device. Particularly, the hetero-cyclic compound represented by Chemical Formula 1 can be used as a material of an electron transfer layer or a charge generation layer in an organic light emitting device. In addition, using the hetero-cyclic compound represented by Chemical Formula 1 in an organic light emitting device lowers a driving voltage of the device, enhances light efficiency, and can enhance a lifespan property of the device with thermal stability of the compound.
Hereinafter, the present application will be described in detail.
A hetero-cyclic compound according to one embodiment of the present application is represented by Chemical Formula 1. More specifically, the hetero-cyclic compound represented by Chemical Formula 1 is capable of being used as an organic material layer material of an organic light emitting device with such a core structure and structural characteristics of substituents.
In one embodiment of the present application, when m of Chemical Formula 1 is 2 or greater, two or more Lls may be the same as or different from each other. In addition, when n of Chemical Formula 1 is 2 or greater, two or more Zls may be the same as or different from each other.
In one embodiment of the present application, m of Chemical Formula 1 may be an integer of 1 to 4.
In one embodiment of the present application, R1 and R2 of Chemical Formula 1 may bond to each other to form a substituted or unsubstituted aliphatic or aromatic hydrocarbon ring. In addition, in one embodiment of the present application, R3 and R4 of Chemical Formula 1 may bond to each other to form a substituted or unsubstituted aliphatic or aromatic hydrocarbon ring.
According to one embodiment of the present application, Chemical Formula 1 may be represented by any one of the following Chemical Formulae 2 to 7.
In Chemical Formulae 2 to 7,
R9 is represented by -(L2)p-(Z2)q,
L2 has the same definition as L1 of Chemical Formula 1 and Z2 has the same definition as Z1 of Chemical Formula 1,
p is an integer of 0 to 3,
q is an integer of 1 to 4, and
R1 to R8 have the same definitions as in Chemical Formula 1.
In one embodiment of the present application, R5 to R8 of Chemical Formula 1 may be each independently hydrogen or deuterium.
In one embodiment of the present application, L1 and L2 of Chemical Formulae 1 to 7 are each independently a direct bond; a substituted or unsubstituted C6 to C60 arylene group; or a substituted or unsubstituted C2 to C60 heteroarylene group.
In another embodiment, L1 and L2 of Chemical Formulae 1 to 7 are each independently a direct bond; a substituted or unsubstituted C6 to C40 arylene group; or a substituted or unsubstituted C2 to C40 heteroarylene group.
In another embodiment, L1 and L2 of Chemical Formulae 1 to 7 are each independently a direct bond; a C6 to C40 arylene group; or a C2 to C40 heteroarylene group.
In another embodiment, L1 and L2 of Chemical Formulae 1 to 7 may be each independently a direct bond; a phenylene group; a naphthylene group; a pyrenylene group; a biphenylylene group; a triphenylenylene group; an anthracenylene group; a divalent pyridine group; a divalent pyrimidine group; a divalent triazine group; a divalent quinoline group; or a divalent pyrazine group.
In one embodiment of the present application, Z1 and Z2 of Chemical Formulae 1 to 7 are each independently selected from the group consisting of hydrogen; deuterium; a substituted or unsubstituted C6 to C60 aryl group; a substituted or unsubstituted C2 to C60 heteroaryl group; and —P(═O)RR′, and R and R′ are the same as or different from each other, and each independently hydrogen; deuterium; —CN; a substituted or unsubstituted C1 to C60 alkyl group; a substituted or unsubstituted C3 to C60 cycloalkyl group; a substituted or unsubstituted C6 to C6 aryl group; or a substituted or unsubstituted C2 to C6 heteroaryl group.
In another embodiment, Z1 and Z2 of Chemical Formulae 1 to 7 are each independently selected from the group consisting of hydrogen; deuterium; a substituted or unsubstituted C6 to C40 aryl group; a substituted or unsubstituted C2 to C40 heteroaryl group; and —P(═O)RR′, and R and R′ are the same as or different from each other, and each independently hydrogen; deuterium; or a substituted or unsubstituted C6 to C40 aryl group.
In another embodiment, Z1 and Z2 of Chemical Formulae 1 to 7 are each independently selected from the group consisting of hydrogen; a C6 to C40 aryl group unsubstituted or substituted with one or more substituents selected from the group consisting of a C6 to C40 aryl group, a C2 to C40 heteroaryl group and P(═O)RR′; a C2 to C40 heteroaryl group unsubstituted or substituted with one or more substituents selected from the group consisting of a C6 to C40 aryl group, a C2 to C40 heteroaryl group and P(═O)RR′; and —P(═O)RR′, and R and R′ are the same as or different from each other and each independently a C6 to C40 aryl group.
In another embodiment, Z1 and Z2 of Chemical Formulae 1 to 7 are each independently selected from the group consisting of hydrogen; a phenyl group unsubstituted or substituted with one or more substituents selected from the group consisting of a pyridine group, a quinoline group and P(═O)RR′; a naphthyl group unsubstituted or substituted with P(═O)RR′; an anthracene group unsubstituted or substituted with a phenyl group; a pyrene group unsubstituted or substituted with one or more substituents selected from the group consisting of a pyridine group and a pyrimidine group; a fluoranthenyl group; a triphenylene group unsubstituted or substituted with a pyrazine group; a biphenylene group; a fluorene group unsubstituted or substituted with one or more substituents selected from the group consisting of a phenyl group and a xanthene group; a phenanthrene group and a spirobifluorene group, and R and R′ are the same as or different from each other and each independently a phenyl group.
In another embodiment, Z1 and Z2 of Chemical Formulae 1 to 7 are each independently selected from the group consisting of hydrogen; a pyridine group unsubstituted or substituted with one or more substituents selected from the group consisting of a phenyl group, a biphenyl group and a pyridine group; a quinoline group unsubstituted or substituted with one or more substituents selected from the group consisting of a pyridine group, a pyrimidine group and —P(═O)RR′; a phenanthroline group unsubstituted or substituted with one or more substituents selected from the group consisting of a phenyl group and a pyridine group; a pyrimidine group unsubstituted or substituted with one or more substituents selected from the group consisting of a phenyl group, a biphenyl group and a pyridine group; a quinazoline group; a benzimidazole group unsubstituted or substituted with a phenyl group; a triazine group unsubstituted or substituted with one or more substituents selected from the group consisting of a phenyl group and a biphenyl group; an indole group unsubstituted or substituted with a phenyl group; a carbazole group; a pyrido[2,3-b]indole group unsubstituted or substituted with a pyridine group; a phenanthro[9,10-b]imidazole group unsubstituted or substituted with a phenyl group; and a pyrazine group unsubstituted or substituted with an imidazo[1,2-a]pyridine group and a phenyl group, and R and R′ are the same as or different from each other and each independently a phenyl group.
In another embodiment, Z1 and Z2 of Chemical Formulae 1 to 7 may be each independently P(═O)RR′, and R and R′ are the same as or different from each other and each independently a phenyl group.
In one embodiment of the present application, R1 and R2 of Chemical Formula 1 bond to each other to form an aromatic hydrocarbon ring, or R3 and R4 bond to each other to form an aromatic hydrocarbon ring, and, among R1 to R4, groups that do not form the aromatic hydrocarbon ring may be hydrogen or deuterium.
In another embodiment, R1 and R2 of Chemical Formula 1 bond to each other to form a benzene ring, or R3 and R4 bond to each other to form a benzene ring, and, among R1 to R4, groups that do not form the benzene ring may be hydrogen.
In one embodiment of the present application, R, R′ and R″ of Chemical Formulae 1 to 7 are the same as or different from each other, and may be each independently hydrogen; a substituted or unsubstituted C1 to C60 alkyl group; or a substituted or unsubstituted C6 to C60 aryl group.
In the present specification, the term “substituted or unsubstituted” means being substituted with one or more substituents selected from the group consisting of deuterium; a halogen group; —CN; a C1 to Co alkyl group; a C2 to C60 alkenyl group; a C2 to C60 alkynyl group; a C3 to C60 cycloalkyl group; a C2 to C60 heterocycloalkyl group; a C6 to C60 aryl group; a C2 to C60 heteroaryl group; —SiRR′R″; —P(═O)RR′; a C1 to C20 alkylamine group; a C6 to C6 arylamine group; and a C2 to C60 heteroarylamine group, or being unsubstituted, or being substituted with a substituent bonding two or more of the above-mentioned substituents, or being substituted, or being substituted with a substituent linking two or more substituents selected from among the above-mentioned substituents, or being unsubstituted. For example, “a substituent linking two or more substituents” may comprise a biphenyl group. In other words, a biphenyl group may be an aryl group, or may be interpreted as a substituent linking two phenyl groups. The additional substituents may be further substituted. R, R′ and R″ are the same as or different from each other, and each independently hydrogen; deuterium; —CN; a substituted or unsubstituted C1 to C60 alkyl group; a substituted or unsubstituted C3 to C60 cycloalkyl group; a substituted or unsubstituted C6 to C60 aryl group; or a substituted or unsubstituted C2 to C60 heteroaryl group.
According to one embodiment of the present application, the “substituted or unsubstituted” means being substituted with one or more substituents selected from the group consisting of deuterium, a halogen group, —CN, SiRR′R″, P(═O)RR′, a C1 to C20 linear or branched alkyl group, a C6 to C60 aryl group, and a C2 to C60 heteroaryl group, or being unsubstituted, and
R, R′ and R″ are the same as or different from each other, and each independently hydrogen; deuterium; —CN; a C1 to C60 alkyl group unsubstituted or substituted with deuterium, a halogen group, —CN, a C1 to C20 alkyl group, a C6 to C60 aryl group and a C2 to C60 heteroaryl group; a C3 to C60 cycloalkyl group unsubstituted or substituted with deuterium, halogen, —CN, a C1 to C20 alkyl group, a C6 to C60 aryl group and a C2 to C60 heteroaryl group; a C6 to C60 aryl group unsubstituted or substituted with deuterium, halogen, —CN, a C1 to C20 alkyl group, a C6 to C60 aryl group and a C2 to C60 heteroaryl group; or a C2 to C60 heteroaryl group unsubstituted or substituted with deuterium, halogen, —CN, a C1 to C20 alkyl group, a C6 to C60 aryl group and a C2 to C60 heteroaryl group.
The term “substituted” means a hydrogen atom bonding to a carbon atom of a compound is changed to another substituent, and the position of substitution is not limited as long as it is a position at which the hydrogen atom is substituted, that is, a position at which a substituent can substitute, and when two or more substituents substitute, the two or more substituents may be the same as or different from each other.
In the present specification, the halogen may be fluorine, chlorine, bromine or iodine.
In the present specification, the alkyl group comprises linear or branched having 1 to 60 carbon atoms, and may be further substituted with other substituents. The number of carbon atoms of the alkyl group may be from 1 to 60, specifically from 1 to 40 and more specifically from 1 to 20. Specific examples thereof may comprise 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-methyl-butyl group, a 1-ethyl-butyl group, a pentyl group, an n-pentyl group, an isopentyl group, a neopentyl group, a tert-pentyl group, a hexyl group, an 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, an n-heptyl group, a 1-methylhexyl group, a cyclopentylmethyl group, a cyclohexylmethyl group, an octyl group, an n-octyl group, a tert-octyl group, a 1-methylheptyl group, a 2-ethylhexyl group, a 2-propylpentyl group, an n-nonyl group, a 2,2-dimethylheptyl group, a 1-ethyl-propyl group, a 1,1-dimethyl-propyl group, an isohexyl group, a 2-methylpentyl group, a 4-methylhexyl group, a 5-methylhexyl group and the like, but are not limited thereto.
In the present specification, the alkenyl group comprises linear or branched having 2 to 60 carbon atoms, and may be further substituted with other substituents. The number of carbon atoms of the alkenyl group may be from 2 to 60, specifically from 2 to 40 and more specifically from 2 to 20. Specific examples thereof may comprise 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, a 3-methyl-1-butenyl group, a 1,3-butadienyl group, an allyl group, a 1-phenylvinyl-1-yl group, a 2-phenylvinyl-1-yl group, a 2,2-diphenylvinyl-1-yl group, a 2-phenyl-2-(naphthyl-1-yl)vinyl-1-yl group, a 2,2-bis(diphenyl-1-yl)vinyl-1-yl group, a stilbenyl group, a styrenyl group and the like, but are not limited thereto.
In the present specification, the alkynyl group comprises linear or branched having 2 to 60 carbon atoms, and may be further substituted with other substituents. The number of carbon atoms of the alkynyl group may be from 2 to 60, specifically from 2 to 40 and more specifically from 2 to 20.
In the present specification, the cycloalkyl group comprises monocyclic or multicyclic having 3 to 60 carbon atoms, and may be further substituted with other substituents. Herein, the multicyclic means a group in which the cycloalkyl group is directly linked to or fused with other cyclic groups. Herein, the other cyclic groups may be a cycloalkyl group, however, may also be different types of cyclic groups such as a heterocycloalkyl group, an aryl group and a heteroaryl group. The number of carbon groups of the cycloalkyl group may be from 3 to 60, specifically from 3 to 40 and more specifically from 5 to 20. Specific examples thereof may comprise a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a 3-methylcyclopentyl group, a 2,3-dimethylcyclopentyl group, a cyclohexyl group, a 3-methylcyclohexyl group, a 4-methylcyclohexyl group, a 2,3-dimethylcyclohexyl group, a 3,4,5-trimethylcyclohexyl group, a 4-tert-butylcyclohexyl group, a cycloheptyl group, a cyclooctyl group and the like, but are not limited thereto.
In the present specification, the heterocycloalkyl group comprises O, S, Se, N or Si as a heteroatom, comprises monocyclic or multicyclic having 2 to 60 carbon atoms, and may be further substituted with other substituents. Herein, the multicyclic means a group in which the heterocycloalkyl group is directly linked to or fused with other cyclic groups. Herein, the other cyclic groups may be a heterocycloalkyl group, however, may also be different types of cyclic groups such as a cycloalkyl group, an aryl group and a heteroaryl group. The number of carbon atoms of the heterocycloalkyl group may be from 2 to 60, specifically from 2 to 40 and more specifically from 3 to 20.
In the present specification, the aryl group comprises monocyclic or multicyclic having 6 to 60 carbon atoms, and may be further substituted with other substituents. Herein, the multicyclic means a group in which the aryl group is directly linked to or fused with other cyclic groups. Herein, the other cyclic groups may be an aryl group, however, may also be different types of cyclic groups such as a cycloalkyl group, a heterocycloalkyl group and a heteroaryl group. The aryl group comprises a spiro group. The number of carbon atoms of the aryl group may be from 6 to 60, specifically from 6 to 40 and more specifically from 6 to 25. Specific examples of the aryl group may comprise a phenyl group, a biphenyl group, a triphenyl group, a naphthyl group, an anthryl group, a chrysenyl group, a phenanthrenyl group, a perylenyl group, a fluoranthenyl group, a triphenylenyl group, a phenalenyl group, a pyrenyl group, a tetracenyl group, a pentacenyl group, a fluorenyl group, an indenyl group, an acenaphthylenyl group, a benzofluorenyl group, a spirobifluorenyl group, a 2,3-dihydro-1H-indenyl group, a fused ring thereof, and the like, but are not limited thereto.
In the present specification, the spiro group is a group comprising a spiro structure, and may have 15 to 60 carbon atoms. For example, the spiro group may comprise a structure in which a 2,3-dihydro-1H-indene group or a cyclohexane group spiro bonds to a fluorenyl group. Specifically, the following spiro group may comprise any one of the groups having the following structural formulae.
In the present specification, the heteroaryl group comprises O, S, Se, N or Si as a heteroatom, comprises monocyclic or multicyclic having 2 to 60 carbon atoms, and may be further substituted with other substituents. Herein, the multicyclic means a group in which the heteroaryl group is directly linked to or fused with other cyclic groups. Herein, the other cyclic groups may be a heteroaryl group, however, may also be different types of cyclic groups such as a cycloalkyl group, a heterocycloalkyl group and an aryl group. The number of carbon atoms of the heteroaryl group may be from 2 to 60, specifically from 2 to 40 and more specifically from 3 to 25. Specific examples of the heteroaryl group may comprise a pyridyl group, a pyrrolyl group, a pyrimidyl group, a pyridazinyl group, a furanyl group, a thiophene group, an imidazolyl group, a pyrazolyl group, an oxazolyl group, an isoxazolyl group, a thiazolyl group, an isothiazolyl group, a triazolyl group, a furazanyl group, an oxadiazolyl group, a thiadiazolyl group, a dithiazolyl group, a tetrazolyl group, a pyranyl group, a thiopyranyl group, a diazinyl group, an oxazinyl group, a thiazinyl group, a dioxynyl group, a xanthene group, a triazinyl group, a tetrazinyl group, a quinolyl group, an isoquinolyl group, a quinazolinyl group, an isoquinazolinyl group, a qninozolinyl group, a naphthyridyl group, an acridinyl group, a phenanthridinyl group, an imidazopyridinyl group, a diazanaphthalenyl group, a triazaindene group, an indolyl group, an indolizinyl group, a benzothiazolyl group, a benzoxazolyl group, a benzimidazolyl group, a benzothiophene group, a benzofuran group, a dibenzothiophene group, a dibenzofuran group, a carbazolyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a phenazinyl group, a dibenzosilole group, spirobi(dibenzosilole), a dihydrophenazinyl group, a phenoxazinyl group, a phenanthridyl group, an imidazopyridinyl group, a thienyl group, an indolo[2,3-a]carbazolyl group, an indolo[2,3-b]carbazolyl group, an indolinyl group, a 10,11-dihydro-dibenzo[b,f]azepine group, a 9,10-dihydroacridinyl group, a phenanthrazinyl group, a phenothiathiazinyl group, a phthalazinyl group, a naphthylidinyl group, a phenanthrolinyl group, a phenanthro[9,10-d]imidazole group, a benzo[c][1,2,5]thiadiazolyl group, a 5,10-dihydrobenzo[b,e][1,4]azasilinyl, a pyrazolo[1,5-c]quinazolinyl group, a pyrido[2,3-b]indole group, a pyrido[1,2-b]indazolyl group, a pyrido[1,2-a]imidazo[1,2-e]indolinyl group, an imidazo[1,2-a]pyridine group, a 5,11-dihydroindeno[1,2-b]carbazolyl group and the like, but are not limited thereto.
In the present specification, the amine group may be selected from the group consisting of a monoalkylamine group; a monoarylamine group; a monoheteroarylamine group; —NH2; a dialkylamine group; a diarylamine group; a diheteroarylamine group; an alkylarylamine group; an alkylheteroarylamine group; and an arylheteroarylamine group, and although not particularly limited thereto, the number of carbon atoms is preferably from 1 to 30. Specific examples of the amine group may comprise a methylamine group, a dimethylamine group, an ethylamine group, a diethylamine group, a phenylamine group, a naphthylamine group, a biphenylamine group, a dibiphenylamine group, an anthracenylamine group, a 9-methyl-anthracenylamine group, a diphenylamine group, a phenylnaphthylamine group, a ditolylamine group, a phenyltolylamine group, a triphenylamine group, a biphenylnaphthylamine group, a phenylbiphenylamine group, a biphenylfluorenylamine group, a phenyltriphenylenylamine group, a biphenyltriphenylenylamine group and the like, but are not limited thereto.
In the present specification, the arylene group means the aryl group having two bonding sites, that is, a divalent group. Descriptions on the aryl group provided above may be applied thereto except for each being a divalent. In addition, the heteroarylene group means the heteroaryl group having two bonding sites, that is, a divalent group. Descriptions on the heteroaryl group provided above may be applied thereto except for each being a divalent.
According to one embodiment of the present application, Chemical Formula 1 may be represented by any one of the following compounds, but is not limited thereto.
In addition, by introducing various substituents to the structure of Chemical Formula 1, compounds having unique properties of the introduced substituents may be synthesized. For example, by introducing substituents normally used as hole injection layer materials, hole transfer layer materials, light emitting layer materials, electron transfer layer materials and charge generation layer materials used for manufacturing an organic light emitting device to the core structure, materials satisfying conditions required for each organic material layer may be synthesized.
In addition, by introducing various substituents to the structure of Chemical Formula 1, the energy band gap may be finely controlled, and meanwhile, properties at interfaces between organic materials are enhanced, and material applications may become diverse.
Meanwhile, the hetero-cyclic compound has excellent thermal stability with a high glass transition temperature (Tg). Such an increase in the thermal stability becomes an important factor in providing driving stability to a device.
The hetero-cyclic compound according to one embodiment of the present application may be prepared through a multistep chemical reaction. Some intermediate compounds are prepared first, and the compound of Chemical Formula 1 may be prepared from the intermediate compounds. More specifically, the hetero-cyclic compound according to one embodiment of the present application may be prepared based on preparation examples to be described below.
Another embodiment of the present application provides an organic light emitting device comprising the hetero-cyclic compound represented by Chemical Formula 1.
The organic light emitting device according to one embodiment of the present application may be manufactured using common organic light emitting device manufacturing methods and materials except that one or more organic material layers are formed using the hetero-cyclic compound described above.
The hetero-cyclic compound may be formed into an organic material layer through a solution coating method as well as a vacuum deposition method when manufacturing the organic light emitting device. Herein, the solution coating method means spin coating, dip coating, inkjet printing, screen printing, a spray method, roll coating and the like, but is not limited thereto.
Specifically, the organic light emitting device according to one embodiment of the present application comprises an anode, a cathode, and one or more organic material layers provided between the anode and the cathode, wherein one or more layers of the organic material layers comprise the hetero-cyclic compound represented by Chemical Formula 1.
In addition, the organic light emitting device according to one embodiment of the present application comprises an anode, a cathode, and two or more stacks provided between the anode and the cathode, wherein the two or more stacks each independently comprise a light emitting layer, a charge generation layer is included between the two or more stacks, and the charge generation layer comprises the hetero-cyclic compound represented by Chemical Formula 1.
In addition, the organic light emitting device according to one embodiment of the present application comprises an anode, a first stack provided on the anode and comprising a first light emitting layer, a charge generation layer provided on the first stack, a second stack provided on the charge generation layer and comprising a second light emitting layer, and a cathode provided on the second stack. Herein, the charge generation layer may comprise the hetero-cyclic compound represented by Chemical Formula 1. In addition, the first stack and the second stack may each independently further comprise one or more types of the hole injection layer, the hole transfer layer, the hole blocking layer, the electron transfer layer, the electron injection layer described above and the like.
The charge generation layer may be an N-type charge generation layer, and the charge generation layer may further comprise a dopant known in the art in addition to the hetero-cyclic compound represented by Chemical Formula 1.
As the organic light emitting device according to one embodiment of the present application, an organic light emitting device having a 2-stack tandem structure is schematically illustrated in
Herein, the first electron blocking layer, the first bole blocking layer, the second hole blocking layer and the like described in
The organic light emitting device according to the present specification may be manufactured using materials and methods known in the art except that one or more layers of the organic material layers comprise the hetero-cyclic compound represented by Chemical Formula 1.
The hetero-cyclic compound represented by Chemical Formula 1 may form one or more layers of the organic material layers of the organic light emitting device alone. However, as necessary, the hetero-cyclic compound represented by Chemical Formula 1 may be mixed with other materials to form the organic material layers.
The hetero-cyclic compound represented by Chemical Formula 1 may be used as a material of the charge generation layer in the organic light emitting device.
The hetero-cyclic compound represented by Chemical Formula 1 may be used as a material of the electron transfer layer, the hole blocking layer, the light emitting layer or the like in the organic light emitting device. As one example, the hetero-cyclic compound represented by Chemical Formula 1 may be used as a material of the electron transfer layer, the hole transfer layer or the light emitting layer in the organic light emitting device.
In addition, the hetero-cyclic compound represented by Chemical Formula 1 may be used as a material of the light emitting layer in the organic light emitting device. As one example, the hetero-cyclic compound represented by Chemical Formula 1 may be used as a phosphorescent host material of the light emitting layer in the organic light emitting device.
In the organic light emitting device according to one embodiment of the present application, materials other than the hetero-cyclic compound of Chemical Formula 1 are illustrated below, however, these are for illustrative purposes only and not for limiting the scope of the present application, and may be replaced by materials known in the art.
As the anode material, materials having relatively large work function may be used, and transparent conductive oxides, metals, conductive polymers or the like may be used. Specific examples of the anode material comprise metals such as vanadium, chromium, copper, zinc and gold, or alloys thereof; metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO) and indium zinc oxide (IZO); combinations of metals and oxides such as ZnO:Al or SnO2:Sb; conductive polymers such as poly(3-methylcompound), poly[3,4-(ethylene-1,2-dioxy)compound](PEDT), polypyrrole and polyaniline, but are not limited thereto.
As the cathode material, materials having relatively small work function may be used, and metals, metal oxides, conductive polymers or the like may be used. Specific examples of the cathode material comprise metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin and lead, or alloys thereof; multilayer structure materials such as LiF/Al or LiO2/Al, and the like, but are not limited thereto.
As the hole injection material, known hole injection materials may be used, and for example, phthalocyanine compounds such as copper phthalocyanine disclosed in U.S. Pat. No. 4,356,429, or starburst-type amine derivatives such as tris(4-carbazoyl-9-ylphenyl)amine (TCTA), 4,4′,4″-tri[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA) or 1,3,5-tris[4-(3-methylphenylphenylamino)phenyl]benzene (m-MTDAPB) described in the literature [Advanced Material, 6, p. 677 (1994)], polyaniline/dodecylbenzene sulfonic acid, poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate), polyaniline/camphor sulfonic acid or polyaniline/poly(4-styrene-sulfonate) that are conductive polymers having solubility, and the like, may be used.
As the hole transfer material, pyrazoline derivatives, arylamine-based derivatives, stilbene derivatives, triphenyldiamine derivatives and the like may be used, and low molecular or high molecular materials may also be used.
As the electron transfer material, metal complexes of oxadiazole derivatives, anthraquinodimethane and derivatives thereof, benzoquinone and derivatives thereof, naphthoquinone and derivatives thereof, anthraquinone and derivatives thereof, tetracyanoanthraquinodimethane and derivatives thereof, fluorenone derivatives, diphenyldicyanoethylene and derivatives thereof, diphenoquinone derivatives, 8-hydroxyquinoline and derivatives thereof, and the like, may be used, and high molecular materials may also be used as well as low molecular materials.
As examples of the electron injection material, LiF is typically used in the art, however, the present application is not limited thereto.
As the light emitting material, red, green or blue light emitting materials may be used, and as necessary, two or more light emitting materials may be mixed and used. In addition, fluorescent materials may also be used as the light emitting material, however, phosphorescent materials may also be used.
As the light emitting material, materials emitting light by bonding electrons and holes injected from an anode and a cathode, respectively, may be used alone, however, materials having a host material and a dopant material involved in light emission together may also be used.
The organic light emitting device according to one embodiment of the present application may be a top-emission type, a bottom-emission type or a dual-emission type depending on the materials used.
The hetero-cyclic compound according to one embodiment of the present application may also be used in an organic electronic device comprising an organic solar cell, an organic photo conductor, an organic transistor and the like under a similar principle used in the organic light emitting device.
Hereinafter, the present specification will be described in more detail with reference to examples, however, these are for illustrative purposes only, and the scope of the present application is not limited thereto.
A 1-methyl-1H-imidazole compound (2 g, 24.36 mmol) was dissolved in 50 ml of MC. Chlorosulfonic acid (1.6 ml, 24.36 mmol) was added dropwise thereto at 0° C., the temperature was raised to room temperature, and the result was stirred for 1 hour. The reaction solution was washed twice with dichloromethane to obtain target Compound (MSAIm)Cl (3.2 g, 67%).
After dissolving a naphtylamine compound (16.2 g, 112.91 mmol) in 200 ml of EtOH, 4-bromobenzaldehyde (19 g, 102.64 mmol), 1H-indene-1,3 (2H)-dione (15 g, 102.64 mmol) and (MSAIm)Cl (1 g, 5.13 mmol) were added thereto, and the result was stirred under reflux. Excess EtOH was added thereto, and the result was ultrasonic treated and filtered to obtain target Compound 10-1 (42 g, 85%).
500 ml of MC was introduced to Compound 10-1 (42 g, 95.82 mmol) and dispersed. MnO2 (142 g, 1633.31 mmol) was added thereto, and the result was stirred for 24 hours at room temperature. Solids were filtered, and the filtrate was concentrated and recrystallized with MC/MeOH to obtain target Compound 10-2 (13 g, 31%).
After dissolving Compound 10-2 (13 g, 29.80 mmol) in 400 ml of DEG, hydrazine monohydrate (95.5 g, 2979.60 mmol) was added thereto, and the result was stirred under reflux. KOH (16.7 g, 297.96 mmol) dissolved in 80 ml of D.W was added dropwise thereto, and the result was stirred at 140° C. 1 L of D.W was added thereto for precipitation and the result was filtered, washed with D.W and MeOH, and then dried to obtain target Compound 10-3 (11.5 g, 91%).
After dissolving Compound 10-3 (11 g, 26.05 mmol) in 150 ml of THF, KOt-Bu (8.8 g, 78.14 mmol) was added thereto at 0° C., and the result was stirred for 10 minutes. Iodomethane (11.1 g, 78.14 mmol) was added thereto, and the result was stirred at room temperature. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4.
The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 10-4 (9 g, 77%).
After dissolving Compound 10-4 (9.2 g, 20.43 mmol) in 200 ml of 1,4-dioxane, bis(pinacolato)diboron (7.8 g, 30.64 mmol), PdCl2(dppf) (0.8 g, 1.02 mmol) and potassium acetate (8 g, 81.71 mmol) were added thereto, and the result was stirred under reflux. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4. The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 10-5 (10 g, 98%).
After introducing Compound 10-5 (11.2 g, 22.52 mmol) and 1-bromopyrene (5.7 g, 20.26 mmol) to 100 ml of toluene, 20 ml of EtOH and 20 ml of D.W, Pd(PPh3)4 (1.3 g, 1.13 mmol) and K2CO3 (6.2 g, 45.03 mmol) were added thereto, and the result was stirred under reflux. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4. After vacuum concentrating the solvent, MeOH was added thereto to recrystallize and obtain solids. The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 10 (7.9 g, 61%).
Target Compound A was synthesized in the same manner as the preparation of Compound 10 except that, in Preparation Example 1, Intermediate A of the following Table 1 was used instead of 1-bromopyrene.
After dissolving an aniline compound (10.4 g, 112.91 mmol) in 200 ml of EtOH, 4-bromobenzaldehyde (19 g, 102.64 mmol), 1H-indene-1,3(2H)-dione (15 g, 102.64 mmol) and (MSAIm)Cl (1 g, 5.13 mmol) were added thereto, and the result was stirred under reflux. Excess EtOH was added thereto, and the result was ultrasonic treated and filtered to obtain target Compound 179-1 (42 g, 85%).
500 ml of MC was introduced to Compound 179-1 (37 g, 95.82 mmol) and dispersed. MnO2 (142 g, 1633.31 mmol) was added thereto, and the result was stirred for 24 hours at room temperature. Solids were filtered, and the filtrate was concentrated and recrystallized with MC/MeOH to obtain target Compound 179-2 (13 g, 31%).
After dissolving Compound 179-2 (11.5 g, 29.80 mmol) in 400 ml of DEG, hydrazine monohydrate (95.5 g, 2979.60 mmol) was added thereto, and the result was stirred under reflux. KOH (16.7 g, 297.96 mmol) dissolved in 80 ml of D.W was added dropwise thereto, and the result was stirred at 140° C. 1 L of D.W was added thereto for precipitation and the result was filtered, washed with D.W and MeOH, and then dried to obtain target Compound 179-3 (11.5 g, 91%).
After dissolving Compound 179-3 (9.6 g, 26.05 mmol) in 150 ml of THF, KOt-Bu (8.8 g, 78.14 mmol) was added thereto at 0° C., and the result was stirred for 10 minutes. Iodomethane (11.1 g, 78.14 mmol) was added thereto, and the result was stirred at room temperature. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4.
The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 179-4 (9 g, 77%).
After dissolving Compound 179-4 (9.7 g, 20.43 mnmol) in 200 ml of 1,4-dioxane, bis(pinacolato)diboron (7.8 g, 30.64 mmol), PdCl2(dppf) (0.8 g, 1.02 mmol) and potassium acetate (8 g, 81.71 mmol) were added thereto, and the result was stirred under reflux. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4. The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 179-5 (10 g, 98%).
After introducing Compound 179-5 (11.2 g, 22.52 mmol) and 2-bromo-1,10-phenanthroline (5.3 g, 20.26 mmol) to 100 ml of toluene, 20 ml of EtOH and 20 ml of D.W, Pd(PPh3)4 (1.3 g, 1.13 mmol) and K2CO3 (6.2 g, 45.03 mmol) were added thereto, and the result was stirred under reflux. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4. After vacuum concentrating the solvent, MeOH was added thereto to recrystallize and obtain solids. The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 179 (7.1 g, 57%).
Target Compound B was synthesized in the same manner as the preparation of Compound 179 except that, in Preparation Example 2, Intermediate B of the following Table 2 was used instead of 2-bromo-1,10-phenanthroline.
After dissolving a naphthalen-2-amine compound (10.4 g, 112.91 mmol) in 200 ml of EtOH, 4-bromo-1-naphthaldehyde (23 g, 102.64 mmol), 1H-indene-1,3(2H)-dione (15 g, 102.64 mmol) and (MSAIm)Cl (1 g, 5.13 mmol) were added thereto, and the result was stirred under reflux. Excess EtOH was added thereto, and the result was ultrasonic treated and filtered to obtain target Compound 337-1 (42 g, 85%).
500 ml of MC was introduced to Compound 337-1 (37 g, 95.82 mmol) and dispersed. MnO2 (142 g, 1633.31 mmol) was added thereto, and the result was stirred for 24 hours at room temperature. Solids were filtered, and the filtrate was concentrated and recrystallized with MC/MeOH to obtain target Compound 337-2 (13 g, 31%).
After dissolving Compound 337-2 (11.5 g, 29.80 mmol) in 400 ml of DEG, hydrazine monohydrate (95.5 g, 2979.60 mmol) was added thereto, and the result was stirred under reflux. KOH (16.7 g, 297.96 mmol) dissolved in 80 ml of D.W was added dropwise thereto, and the result was stirred at 140° C. 1 L of D.W was added thereto for precipitation and the result was filtered, washed with D.W and MeOH, and then dried to obtain target Compound 337-3 (11.5 g, 91%).
After dissolving Compound 337-3 (9.6 g, 26.05 mmol) in 150 ml of THF, KOt-Bu (8.8 g, 78.14 mmol) was added thereto at 0° C., and the result was stirred for 10 minutes. Iodomethane (11.1 g, 78.14 mmol) was added thereto, and the result was stirred at room temperature. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4.
The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 337-4 (9 g, 77%).
After dissolving Compound 337-4 (9.7 g, 20.43 mmol) in 200 ml of 1,4-dioxane, bis(pinacolato)diboron (7.8 g, 30.64 mmol), PdCl2(dppf) (0.8 g, 1.02 mmol) and potassium acetate (8 g, 81.71 mmol) were added thereto, and the result was stirred under reflux. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4. The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 337-5 (10 g, 98%).
After introducing Compound 337-5 (11.2 g, 22.52 mmol) and 4-bromo-2,6-diphenylpyrimidine (6.3 g, 20.26 mmol) to 100 ml of toluene, 20 ml of EtOH and 20 ml of D.W, Pd(PPh3)4 (1.3 g, 1.13 mmol) and K2CO3 (6.2 g, 45.03 mmol) were added thereto, and the result was stirred under reflux. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4. After vacuum concentrating the solvent, MeOH was added thereto to recrystallize and obtain solids. The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 337 (6.5 g, 68%).
Target Compound C was synthesized in the same manner as the preparation of Compound 337 except that, in Preparation Example 3, Intermediate C of the following Table 3 was used instead of 4-bromo-2,6-diphenylpyrimidine.
Target Compound D was synthesized in the same manner as the preparation of Compound 337 except that, in the synthesis of 366-1 in Preparation Example 3, Synthesis Reagent D of the following Table 4 was used instead of the synthesis reagent 4-bromo-1-naphthaldehyde.
After dissolving a naphthalen-1-amine compound (17.3 g, 112.91 mmol) in 200 ml of EtOH, 4-bromo-1-naphthaldehyde (23 g, 102.64 mmol), 1H-indene-1,3(2H)-dione (15 g, 102.64 mmol) and (MSAIm)Cl (1 g, 5.13 mmol) were added thereto, and the result was stirred under reflux. Excess EtOH was added thereto, and the result was ultrasonic treated and filtered to obtain target Compound 400-1 (42 g, 85%).
500 ml of MC was introduced to Compound 400-1 (37 g, 95.82 mmol) and dispersed. MnO2 (142 g, 1633.31 mmol) was added thereto, and the result was stirred for 24 hours at room temperature. Solids were filtered, and the filtrate was concentrated and recrystallized with MC/MeOH to obtain target Compound 400-2 (13 g, 31%).
After dissolving Compound 400-2 (11.5 g, 29.80 mmol) in 400 ml of DEG, hydrazine monohydrate (95.5 g, 2979.60 mmol) was added thereto, and the result was stirred under reflux. KOH (16.7 g, 297.96 mmol) dissolved in 80 ml of D.W was added dropwise thereto, and the result was stirred at 140° C. 1 L of D.W was added thereto for precipitation and the result was filtered, washed with D.W and MeOH, and then dried to obtain target Compound 400-3 (11.5 g, 91%).
After dissolving Compound 400-3 (9.6 g, 26.05 mmol) in 150 ml of THF, KOt-Bu (8.8 g, 78.14 mmol) was added thereto at 0° C., and the result was stirred for 10 minutes. Iodomethane (11.1 g, 78.14 mmol) was added thereto, and the result was stirred at room temperature. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4.
The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 400-4 (9 g, 77%).
After dissolving Compound 400-4 (9.7 g, 20.43 mmol) in 200 ml of 1,4-dioxane, bis(pinacolato)diboron (7.8 g, 30.64 mmol), PdCl2(dppf) (0.8 g, 1.02 mmol) and potassium acetate (8 g, 81.71 mmol) were added thereto, and the result was stirred under reflux. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4. The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 400-5 (10 g, 98%).
After introducing Compound 400-5 (11.2 g, 22.52 mmol) and 2-(4-bromophenyl)-9-phenyl-1,10-phenanthroline (6.3 g, 20.26 mmol) to 100 ml of toluene, 20 ml of EtOH and 20 ml of D.W, Pd(PPh3)4 (1.3 g, 1.13 mmol) and K2CO3 (6.2 g, 45.03 mmol) were added thereto, and the result was stirred under reflux. D.W was added thereto, the result was extracted with MC, and the MC layer was dried with anhydrous Na2SO4. After vacuum concentrating the solvent, MeOH was added thereto to recrystallize and obtain solids. The result was purified using column chromatography with EA and hexane as a developing solvent to obtain target Compound 400 (7.1 g, 68%).
Target Compound E was synthesized in the same manner as the preparation of Compound 400 except that, in Preparation Example 4, Intermediate E of the following Table 5 was used instead of 2-(4-bromophenyl)-9-phenyl-1,10-phenanthroline.
Compounds were prepared in the same manner as in the preparation examples, and the synthesis identification results are shown in Table 6 and Table 7. Table 6 shows measurement values of 1H NMR (CDCl3, 200 MHz), and Table 7 shows measurement values of field desorption mass spectrometry (FD-MS).
1H NMR (CDCl3, 200 Mz)
A glass substrate on which ITO was coated as a thin film to a thickness of 1500 Å was cleaned with distilled water and ultrasonic waves. After the cleaning with distilled water was finished, the substrate was ultrasonic cleaned with solvents such as acetone, methanol and isopropyl alcohol, then dried, and UVO treatment was carried out for 5 minutes in a UV cleaner using UV. After that, the substrate was transferred to a plasma cleaner (PT), and plasma treatment was carried out under vacuum for removing ITO work function and remaining film, and the substrate was transferred to a thermal deposition apparatus for organic deposition.
On the ITO transparent electrode (anode), organic materials were formed in a two-stack white organic light emitting diode (WOLED) structure. As for the first stack, a hole transfer layer was formed first by thermal vacuum depositing TAPC to a thickness of 300 Å. After forming the hole transfer layer, a light emitting layer was thermal vacuum deposited thereon as follows. The light emitting layer was deposited to 300 Å by doping FIrpic in 8% as a blue phosphorescent dopant to TCzl, a host. An electron transfer layer was formed to 400 Å using TmPyPB, and then a charge generation layer was formed to 100 Å by doping Cs2CO3 in 20% to a compound described in the following Table 8.
As for the second stack, a hole injection layer was formed first by thermal vacuum depositing MoO3 to a thickness of 50 Å. A hole transfer layer, a common layer, was formed by doping MoO3 to TAPC in 20% and forming to 100 Å, and then depositing TAPC to 300 Å. After depositing a light emitting layer to 300 Å thereon by doping Ir(ppy)3, a green phosphorescent dopant, in 8% to TCzl, a host, an electron transfer layer was formed to 600 Å using TmPyPB. Lastly, an electron injection layer was formed on the electron transfer layer by depositing lithium fluoride (LiF) to a thickness of 10 Å, and then a cathode was formed on the electron injection layer by depositing an aluminum (Al) cathode to a thickness of 1,200 Å to manufacture an organic electroluminescent device.
Meanwhile, all the organic compounds required to manufacture the OLED device were vacuum sublimation purified under 10−6 torr to 10−8 torr by each material to be used in the OLED manufacture.
For the organic electroluminescent devices manufactured as above, electroluminescent light emission (EL) characteristics were measured using M7000 manufactured by McScience Inc., and with the measurement results, T95 when standard luminance was 3,500 cd/m2 was measured using a lifetime test system (M6000) manufactured by McScience Inc. Results of measuring a driving voltage, light emission efficiency, external quantum efficiency and a color coordinate (CIE) of the white organic electroluminescent devices manufactured according to the present disclosure are as shown in Table 8.
As shown from the results of Table 8, the organic electroluminescent devices using the charge generation layer material of the 2-stack white organic electroluminescent device of the present disclosure had a low driving voltage and improved light emission efficiency compared to Comparative Example 1. Particularly, it was identified that Compounds 13, 14, 15, 27, 32, 72, 80, 146, 179, 224, 226, 361 and 395 were significantly excellent in all of driving, efficiency and lifespan.
The presumed reason for such results is that the compound of the present disclosure used as an N-type charge generation layer formed with an invented skeleton having proper length, strength and flat property and a proper hetero-compound capable of binding with metals is doped with an alkali metal or an alkali-earth metal to form a gap state within the N-type charge generation layer, and electrons produced from a P-type charge generation layer are readily injected to the electron transfer layer through the gap state produced within the N-type charge generation layer. Accordingly, the P-type charge generation layer favorably carried out electron injection and electron transfer to the N-type charge generation layer, and as a result, it is considered that a driving voltage of the organic light emitting device decreased, and efficiency and lifespan were improved.
A glass substrate on which ITO was coated as a thin film to a thickness of 1500 Å was cleaned with distilled water and ultrasonic waves. After the cleaning with distilled water was finished, the substrate was ultrasonic cleaned with solvents such as acetone, methanol and isopropyl alcohol, then dried, and UVO treatment was carried out for 5 minutes in a UV cleaner using UV. After that, the substrate was transferred to a plasma cleaner (PT), and plasma treatment was carried out under vacuum for removing ITO work function and remaining film, and the substrate was transferred to a thermal deposition apparatus for organic deposition. On the ITO transparent electrode (anode), organic materials were formed in a single-stack structure. As a hole injection layer, HAT-CN was deposited to a thickness of 50 Å, and subsequently, a hole transfer layer was formed by doping DNTPD within 10% to NPD, depositing the result to a thickness of 1500 Å, and continuously depositing TCTA to a thickness of 200 Å. Subsequently, a light emitting layer comprising a t-Bu-perylene dopant in an ADN host was formed to a thickness of 250 Å. Next, Alq3, an electron transfer layer, was formed to a thickness of 250 Å, and an N-type charge transfer layer was formed to a thickness of 100 Å by doping Li, an alkali metal, to a compound described in the following Table 9, and Al, a cathode, was formed to a thickness of approximately 1,000 Å to manufacture an organic electroluminescent device.
For the organic electroluminescent devices manufactured as above, electroluminescent light emission (EL) characteristics were measured using M7000 manufactured by McScience Inc., and with the measurement results, T95 when standard luminance was 750 cd/m2 was measured using a lifetime test system (M6000) manufactured by McScience Inc. Results of measuring a driving voltage, light emission efficiency, external quantum efficiency and a color coordinate (CIE) of the white organic electroluminescent devices manufactured according to the present disclosure are as shown in Table 9.
As shown from the results of Table 9, the organic electroluminescent devices using the charge generation layer material of the blue organic electroluminescent device of the present disclosure had a low driving voltage and improved light emission efficiency compared to Comparative Example 2. Particularly, it was identified that Compounds 13, 14, 15, 27, 32, 72, 80, 146, 179, 224, 226, 361 and 395 were significantly excellent in all of driving, efficiency and lifespan.
The presumed reason for such results is that the compound of the present disclosure used as an N-type charge generation layer formed with an invented skeleton having proper length, strength and flat property and a proper hetero-compound capable of binding with metals is doped with an alkali metal or an alkali-earth metal to form a gap state within the N-type charge generation layer, and electrons produced from a P-type charge generation layer are readily injected to the electron transfer layer through the gap state produced within the N-type charge generation layer. Accordingly, the P-type charge generation layer favorably carried out electron injection and electron transfer to the N-type charge generation layer, and as a result, it is considered that a driving voltage of the organic light emitting device decreased, and efficiency and lifespan were improved.
A transparent electrode ITO thin film obtained from glass for an OLED (manufactured by Samsung Corning Advanced Glass) was ultrasonic cleaned consecutively using trichloroethylene, acetone, ethanol and distilled water for 5 minutes each, placed in isopropanol and stored, and then used.
Next, the ITO substrate was installed in a substrate folder of vacuum deposition equipment, and the following 4,4′,4″-tris(N,N-(2-naphthyl)-phenylamino)triphenyl amine (2-TNATA) was introduced to a cell in the vacuum deposition equipment.
Subsequently, the chamber was exhausted until the degree of vacuum inside the chamber reached 10−6 torr, and then a current was applied to the cell to evaporate the 2-TNATA to deposit a hole injection layer having a thickness of 600 Å on the ITO substrate.
The following N,N′-bis(α-naphthyl)-N,N′-diphenyl-4,4′-diamine (NPB) was introduced to a different cell in the vacuum deposition equipment, a current was applied to the cell to evaporate to deposit a hole transfer layer having a thickness of 300 Å on the hole injection layer.
After forming the hole injection layer and the hole transfer layer as above, a blue light emitting material having a structure as follows was deposited thereon as a light emitting layer. Specifically, H1, a blue light emitting host material, was vacuum deposited to a thickness of 200 Å on one cell in the vacuum deposition equipment, and D1, a blue light emitting dopant material, was vacuum deposited thereon in 5% with respect to the host material.
Subsequently, a compound of the following structural formula E1 was deposited to a thickness of 300 Å as an electron transfer layer.
As an electron injection layer, lithium fluoride (LiF) was deposited to a thickness of 10 Å, and an Al cathode was formed to a thickness of 1000 Å to manufacture an OLED device.
Meanwhile, all the organic compounds required to manufacture the OLED device were vacuum sublimation purified under 10−6 torr to 10−8 torr by each material to be used in the OLED manufacture.
For the organic electroluminescent devices manufactured as above, electroluminescent light emission (EL) characteristics were measured using M7000 manufactured by McScience Inc., and with the measurement results, T95 when standard luminance was 700 cd/m2 was measured using a lifetime test system (M6000) manufactured by McScience Inc. Results of measuring a driving voltage, light emission efficiency, external quantum efficiency and a color coordinate (CIE) of the white organic electroluminescent devices manufactured according to the present disclosure are as shown in Table 10.
As shown from the results of Table 10, the organic electroluminescent devices using the electron transfer layer material of the blue organic electroluminescent device of the present disclosure had a low driving voltage and significantly improved light emission efficiency and lifespan compared to Comparative Example 3. Particularly, it was identified that Compounds 1, 10, 53, 77, 113, 117, 120, 155, 166, 171, 174, 178, 184, 195, 196, 218, 280, 284, 316, 320, 323 and 329 were significantly excellent in all of driving, efficiency and lifespan.
The presumed reason for such results is that, when the invented compound having proper length, strength and flat property is used as an electron transfer layer, a compound in an excited state is produced by receiving electrons under a specific condition, and particularly, when the excited state is formed in the heteroskeleton site of the compound, excited energy moves to a stable state before the excited heteroskeleton site goes through a different reaction, and the relatively stabilized compound is capable of efficiently transferring electrons without compound decomposition or destruction. As a reference, it is considered that those having a stable state when excited are aryl or acene series compounds or multicyclic hetero-compounds. Accordingly, it is considered that the compound of the present disclosure enhances electron-transport properties or improved stability resulting in excellency in all of driving, efficiency and lifespan.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2016-0087507 | Jul 2016 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2017/007395 | 7/11/2017 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2018/012845 | 1/18/2018 | WO | A |
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| 10087145 | Kim et al. | Oct 2018 | B2 |
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| 20140284556 | Cheng et al. | Sep 2014 | A1 |
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| 10-2012-0007312 | Jan 2012 | KR |
| 10-2015-0076029 | Jul 2015 | KR |
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| Number | Date | Country | |
|---|---|---|---|
| 20190312211 A1 | Oct 2019 | US |
