Patent Application
20230320201
The present specification relates to a compound, and an organic light emitting device including the same.
This application claims priority to and the benefits of Korean Patent Application No. 10-2020-0122102, filed with the Korean Intellectual Property Office on Sep. 22, 2020, the entire contents of which are incorporated herein by reference.
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 alone may be used, 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, lifetime or efficiency of an organic light emitting device.
The present specification is directed to providing a compound, and an organic light emitting device including the same.
One embodiment of the present specification provides a compound of the following Chemical Formula 1.
in Chemical Formula 1,
In addition, one embodiment of the present application provides an organic light emitting device including a first electrode; a second electrode provided opposite to the first electrode; and an organic material layer provided between the first electrode and the second electrode, wherein the organic material layer includes one or more types of the compound of Chemical Formula 1.
A compound described in the present specification can be used as a material of an organic material layer of an organic light emitting device. The compound is capable of acting as a hole injection material, a hole transfer material, a light emitting material, an electron transfer material, an electron injection material, a charge generation material or the like. Particularly, the compound can be used as a material of a hole transfer layer or an electron blocking layer of an organic light emitting device.
By strengthening hole properties in the fluorene skeleton of Chemical Formula 1, band gap and T1 values are adjusted, and as a result, excellent efficiency and driving are obtained when including Chemical Formula 1 in an organic light emitting device.
Particularly, when using an amine derivative as a hole transfer layer, the unshared electron pair of the amine improves the flow of holes enhancing a hole transfer ability of the hole transfer layer, and when used as an electron blocking layer, deterioration of a hole transfer material caused by electrons invading the hole transfer layer can be suppressed.
In addition, by bonding a substituent thereto, planarity and glass transition temperature of the amine derivative increase, which increases thermal stability of the compound, and a lifetime of an organic light emitting device including the same is improved as well. As a result, using the compound of Chemical Formula 1 as a material of a hole transfer layer or an electron blocking layer in an organic light emitting device is capable of lowering a driving voltage, enhancing light emission efficiency and enhancing lifetime properties in the device.
Hereinafter, the present specification will be described in more detail.
In the present specification, a description of a certain part “including” certain constituents means capable of further including other constituents, and does not exclude other constituents unless particularly stated on the contrary.
In the present specification, a T1 value means an energy level value in a triplet state.
A term “substitution” means a hydrogen atom bonding to a carbon atom of a compound being 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 is capable of substituting, 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, “substituted or unsubstituted” means being substituted with one or more substituents selected from the group consisting of deuterium; halogen; a cyano group; a C1 to C60 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; a silyl group; a phosphine oxide group; and an amine group, or being unsubstituted, or being substituted with a substituent linking two or more substituents selected from among the substituents illustrated above, or being unsubstituted.
In the present specification, a “case of a substituent being not indicated in a chemical formula or compound structure” means that a hydrogen atom bonds to a carbon atom. However, since deuterium (2H) is an isotope of hydrogen, some hydrogen atoms may be deuterium.
In one embodiment of the present application, a “case of a substituent being not indicated in a chemical formula or compound structure” may mean that positions that may come as a substituent may all be hydrogen or deuterium. In other words, since deuterium is an isotope of hydrogen, some hydrogen atoms may be deuterium that is an isotope, and herein, a content of the deuterium may be from 0% to 100%.
In one embodiment of the present application, in a “case of a substituent being not indicated in a chemical formula or compound structure”, hydrogen and deuterium may be mixed in compounds when deuterium is not explicitly excluded such as a deuterium content being 0%, a hydrogen content being 100% or substituents being all hydrogen.
In one embodiment of the present application, deuterium is one of isotopes of hydrogen, is an element having deuteron formed with one proton and one neutron as a nucleus, and may be expressed as hydrogen-2, and the elemental symbol may also be written as D or 2H.
In one embodiment of the present application, an isotope means an atom with the same atomic number (Z) but with a different mass number (A), and may also be interpreted as an element with the same number of protons but with a different number of neutrons.
In one embodiment of the present application, a meaning of a content T % of a specific substituent may be defined as T2/T1×100=T % when the total number of substituents that a basic compound may have is defined as T1, and the number of specific substituents among these is defined as T2.
In other words, in one example, having a deuterium content of 20% in a phenyl group represented by
means that the total number of substituents that the phenyl group may have is 5 (T1 in the formula), and the number of deuterium among these is 1 (T2 in the formula). In other words, having a deuterium content of 20% in a phenyl group may be represented by the following structural formulae.
In addition, in one embodiment of the present application, “a phenyl group having a deuterium content of 0%” may mean a phenyl group that does not include a deuterium atom, that is, a phenyl group that has 5 hydrogen atoms.
In the present specification, the halogen may be fluorine, chlorine, bromine or iodine.
In the present specification, the alkyl group includes linear or branched, 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 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-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, 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 includes linear or branched, 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 include a vinyl group, a 1-propenyl group, an isopropenyl group, a 1-butenyl group, a 2-butenyl group, a 3-butenyl group, a 1-pentenyl group, a 2-pentenyl group, a 3-pentenyl group, 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 includes linear or branched, 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 includes monocyclic or polycyclic having 3 to 60 carbon atoms, and may be further substituted with other substituents. Herein, the polycyclic 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, but 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 include 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 includes O, S, Se, N or Si as a heteroatom, includes monocyclic or polycyclic having 2 to 60 carbon atoms, and may be further substituted with other substituents. Herein, the polycyclic 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, but 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 includes monocyclic or polycyclic having 6 to 60 carbon atoms, and may be further substituted with other substituents. Herein, the polycyclic 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, but may also be different types of cyclic groups such as a cycloalkyl group, a heterocycloalkyl group and a heteroaryl group. The aryl group includes 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. When the aryl group is dicyclic or higher, the number of carbon atoms may be from 8 to 60, from 8 to 40 or from 8 to 30. Specific examples of the aryl group may include a phenyl group, a biphenyl group, a terphenyl 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 group thereof, and the like, but are not limited thereto.
In the present specification, the terphenyl group may be represented by any one of the following structures.
In the present specification, the fluorenyl group may be substituted, and adjacent substituents may bond to each other to form a ring.
When the fluorenyl group is substituted,
and the like may be included, however, the structure is not limited thereto.
In the present specification, the heteroaryl group includes O, S, SO2, Se, N or Si as a heteroatom, includes monocyclic or polycyclic, and may be further substituted with other substituents. Herein, the polycyclic 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, but 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 include 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 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, 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 benzo[c][1,2,5]thiadiazolyl group, 5,10-dihydrobenzo[b,e][1,4]azasilinyl, a pyrazolo[1,5-c]quinazolinyl group, a pyrido[1,2-b]indazolyl group, a pyrido[1,2-a]imidazo[1,2-e]indolinyl group, a benzofuro[2,3-d]pyrimidyl group; a benzothieno[2,3-d]pyrimidyl group; a benzofuro[2,3-a]carbazolyl group, a benzothieno[2,3-a]carbazolyl group, a 1,3-dihydroindolo[2,3-a]carbazolyl group, a benzofuro[3,2-a]carbazolyl group, a benzothieno[3,2-a]carbazolyl group, a 1,3-dihydroindolo[3,2-a]carbazolyl group, a benzofuro[2,3-b]carbazolyl group, a benzothieno[2,3-b]carbazolyl group, a 1,3-dihydroindolo[2,3-b]carbazolyl group, a benzofuro[3,2-b]carbazolyl group, a benzothieno[3,2-b]carbazolyl group, a 1,3-dihydroindolo[3,2-b]carbazolyl group, a benzofuro[2,3-c]carbazolyl group, a benzothieno[2,3-c]carbazolyl group, a 1,3-dihydroindolo[2,3-c]carbazolyl group, a benzofuro[3,2-c]carbazolyl group, a benzothieno[3,2-c]carbazolyl group, a 1,3-dihydroindolo[3,2-c]carbazolyl group, a 1,3-dihydroindeno[2,1-b]carbazolyl group, a 5,11-dihydroindeno[1,2-b]carbazolyl group, a 5,12-dihydroindeno[1,2-c]carbazolyl group, a 5,8-dihydroindeno[2,1-c]carbazolyl group, a 7,12-dihydroindeno[1,2-a]carbazolyl group, a 11,12-dihydroindeno[2,1-a]carbazolyl group and the like, but are not limited thereto.
In the present specification, the silyl group is a substituent including Si, having the Si atom directly linked as a radical, and is represented by —Si(R101) (R102) (R103). R101 to R103 are the same as or different from each other, and may be each independently a substituent formed with at least one of hydrogen; deuterium; a halogen group; an alkyl group; an alkenyl group; an alkoxy group; a cycloalkyl group; an aryl group; and a heterocyclic group. Specific examples of the silyl group may include a trimethylsilyl group, a triethylsilyl group, a t-butyldimethylsilyl group, a vinyldimethylsilyl group, a propyldimethylsilyl group, a triphenylsilyl group, a diphenylsilyl group, a phenylsilyl group and the like, but are not limited thereto.
In the present specification, the phosphine oxide group is represented by —P(═O) (R104) (R105), and R104 and R105 are the same as or different from each other and may be each independently a substituent formed with at least one of hydrogen; deuterium; a halogen group; an alkyl group; an alkenyl group; an alkoxy group; a cycloalkyl group; an aryl group; and a heteroaryl group. Specifically, the phosphine oxide group may be substituted with an alkyl group or an aryl group, and as the alkyl group and the aryl group, the examples described above may be applied. Examples of the phosphine oxide group may include a dimethylphosphine oxide group, a diphenylphosphine oxide group, a dinaphthylphosphine oxide group and the like, but are not limited thereto.
In the present specification, the amine group is represented by —N(R106) (R107), and R106 and R107 are the same as or different from each other and may be each independently a substituent formed with at least one of hydrogen; deuterium; a halogen group; an alkyl group; an alkenyl group; an alkoxy group; a cycloalkyl group; an aryl group; and a heteroaryl group. The amine group may be selected from the group consisting of —NH2; a monoalkylamine group; a monoarylamine group; a monoheteroarylamine group; 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 include 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 examples of the aryl group described above may be applied to the arylene group except that the arylene group is a divalent group.
In the present specification, the examples of the heteroaryl group described above may be applied to the heteroarylene group except that the heteroarylene group is a divalent group.
In the present specification, the ring includes a hydrocarbon ring, a heteroring, or a fused ring thereof.
In the present specification, the hydrocarbon ring may include all rings formed only with carbon and hydrogen, and the examples of the cycloalkyl group and the aryl group described above may be used.
In the present specification, the heteroring may include all rings including a heteroatom, and the examples of the heterocycloalkyl group and the heteroaryl group described above may be used.
One embodiment of the present specification provides a compound represented by Chemical Formula 1.
In one embodiment of the present specification, X may be O.
In one embodiment of the present specification, X may be S.
In one embodiment of the present specification, X may be CR′R″, R′ and R″ are each independently a substituted or unsubstituted C1 to C60 alkyl group; a substituted or unsubstituted C6 to C60 aryl group; or a substituted or unsubstituted C2 to C60 heteroaryl group, and R′ and R″ may bond to each other to form a substituted or unsubstituted C3 to C30 ring.
In one embodiment of the present specification, X may be CR′R″, R′ and R″ are each independently a substituted or unsubstituted C1 to C60 alkyl group; or a substituted or unsubstituted C6 to C60 aryl group, and R′ and R″ may bond to each other to form a substituted or unsubstituted C3 to C30 ring.
In one embodiment of the present specification, X may be CR′R″, R′ and R″ are each independently a substituted or unsubstituted C1 to C30 alkyl group; or a substituted or unsubstituted C6 to C30 aryl group, and R′ and R″ may bond to each other to form a substituted or unsubstituted C3 to C30 ring.
In one embodiment of the present specification, X may be CR′R″, R′ and R″ are each independently a substituted or unsubstituted C1 to C10 alkyl group; or a substituted or unsubstituted C6 to C20 aryl group, and R′ and R″ may bond to each other to form a substituted or unsubstituted C3 to C30 ring.
In one embodiment of the present specification, X may be CR′R″, R′ and R″ are each independently a C1 to C10 alkyl group; or a C6 to C20 aryl group, and R′ and R″ may bond to each other to form a C3 to C30 ring.
In one embodiment of the present specification, X may be CR′R″, and R′ and R″ may be each independently a C1 to C10 alkyl group; or a C6 to C20 aryl group.
In one embodiment of the present specification, X may be CR′R″, and R′ and R″ may be each independently a methyl group; or a phenyl group.
In one embodiment of the present specification, X may be CR′R″, and R′ and R″ may bond to each other to form a C3 to C30 ring.
In one embodiment of the present specification, X may be CR′R″, and R′ and R″ may bond to each other to form a C3 to C20 ring.
In one embodiment of the present specification, X may be CR′R″, and R′ and R″ may bond to each other to form a fluorene ring.
In one embodiment of the present specification, X may be CR′R″, and R′ and R″ may bond to each other to form a ring of the following structure.
In one embodiment of the present specification, L1 is a direct bond; or a substituted or unsubstituted C6 to C60 arylene group.
In one embodiment of the present specification, L1 is a direct bond; or a substituted or unsubstituted C6 to C30 arylene group.
In one embodiment of the present specification, L1 is a direct bond; or a substituted or unsubstituted C6 to C20 arylene group.
In one embodiment of the present specification, L1 is a direct bond; or a C6 to C20 arylene group.
In one embodiment of the present specification, L1 is a direct bond; a phenylene group; or a biphenylene group.
In one embodiment of the present specification, L2 is a direct bond; or a substituted or unsubstituted C6 to C60 arylene group.
In one embodiment of the present specification, L2 is a direct bond; or a substituted or unsubstituted C6 to C30 arylene group.
In one embodiment of the present specification, L2 is a direct bond; or a substituted or unsubstituted C6 to C10 arylene group.
In one embodiment of the present specification, L2 is a direct bond; or a C6 to C10 arylene group.
In one embodiment of the present specification, L2 is a direct bond; or a phenylene group.
In one embodiment of the present specification, L2 may be a direct bond.
In one embodiment of the present specification, L11 and L12 are each independently a direct bond; or a substituted or unsubstituted C6 to C60 arylene group.
In one embodiment of the present specification, L11 and L12 are each independently a direct bond; or a substituted or unsubstituted C6 to C30 arylene group.
In one embodiment of the present specification, L11 and L12 are each independently a direct bond; or a substituted or unsubstituted C6 to C20 arylene group.
In one embodiment of the present specification, L11 and L12 are each independently a direct bond; or a C6 to C20 arylene group.
In one embodiment of the present specification, L11 and L12 are each independently a direct bond; or a phenylene group.
In one embodiment of the present specification, L11 is a direct bond, and L12 is a direct bond; or a substituted or unsubstituted C6 to C30 arylene group.
In one embodiment of the present specification, L11 is a direct bond, and L12 is a direct bond; or a substituted or unsubstituted C6 to C10 arylene group.
In one embodiment of the present specification, L11 is a direct bond, and L12 is a direct bond; or a C6 to C10 arylene group.
In one embodiment of the present specification, L11 is a direct bond, and L12 is a direct bond; or a phenylene group.
In one embodiment of the present specification, R11 and R12 are each independently a substituted or unsubstituted C6 to C60 aryl group; or a substituted or unsubstituted C2 to C60 heteroaryl group.
In one embodiment of the present specification, R11 and R12 are each independently a substituted or unsubstituted C6 to C30 aryl group; or a substituted or unsubstituted C2 to C30 heteroaryl group.
In one embodiment of the present specification, R11 and R12 are each independently a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; a substituted or unsubstituted terphenyl group; a substituted or unsubstituted naphthyl group; a substituted or unsubstituted fluorenyl group; a substituted or unsubstituted dibenzofuran group; or a substituted or unsubstituted dibenzothiophene group.
In one embodiment of the present specification, R11 and R12 are each independently a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; a substituted or unsubstituted terphenyl group; a substituted or unsubstituted naphthyl group; a fluorenyl group unsubstituted or substituted with an alkyl group or an aryl group; 9,9′-spirobi[fluorene]; a substituted or unsubstituted dibenzofuran group; or a substituted or unsubstituted dibenzothiophene group.
In one embodiment of the present specification, R11 and R12 are each independently a phenyl group; a biphenyl group; a terphenyl group; a naphthyl group; a fluorenyl group unsubstituted or substituted with a methyl group or a phenyl group; 9,9′-spirobi[fluorene]; a dibenzofuran group; or a dibenzothiophene group.
In one embodiment of the present specification, R11 is a substituted or unsubstituted C6 to C30 aryl group, and R12 is a substituted or unsubstituted C6 to C30 aryl group; or a substituted or unsubstituted C2 to C30 heteroaryl group.
In one embodiment of the present specification, R11 is a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; a substituted or unsubstituted terphenyl group; a substituted or unsubstituted naphthyl group; a fluorenyl group unsubstituted or substituted with an alkyl group or an aryl group; or 9,9′-spirobi[fluorene], and R12 is a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; a substituted or unsubstituted terphenyl group; a substituted or unsubstituted naphthyl group; a fluorenyl group unsubstituted or substituted with an alkyl group or an aryl group; 9,9′-spirobi[fluorene]; a substituted or unsubstituted dibenzofuran group; or a substituted or unsubstituted dibenzothiophene group.
In one embodiment of the present specification, when R11 is a dibenzofuran group or a dibenzothiophene group, L11 is a substituted or unsubstituted C6 to C30 arylene group.
In one embodiment of the present specification, when R11 is a dibenzofuran group or a dibenzothiophene group, L11 is a C6 to C30 arylene group.
In one embodiment of the present specification, when R11 is a dibenzofuran group or a dibenzothiophene group, L11 is a phenylene group.
In one embodiment of the present specification, when R12 is a dibenzofuran group or a dibenzothiophene group, L12 is a substituted or unsubstituted C6 to C30 arylene group.
In one embodiment of the present specification, when R12 is a dibenzofuran group or a dibenzothiophene group, L12 is a C6 to C30 arylene group.
In one embodiment of the present specification, when R12 is a dibenzofuran group or a dibenzothiophene group, L12 is a phenylene group.
In one embodiment of the present specification, Ar is a substituted or unsubstituted C6 to C60 aryl group; or a substituted or unsubstituted C2 to C60 heteroaryl group.
In one embodiment of the present specification, Ar is a substituted or unsubstituted C6 to C30 aryl group; or a substituted or unsubstituted C2 to C30 heteroaryl group.
In one embodiment of the present specification, Ar is a substituted or unsubstituted C6 to C20 aryl group; or a substituted or unsubstituted C2 to C20 heteroaryl group.
In one embodiment of the present specification, Ar is a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; a substituted or unsubstituted phenanthrenyl group; a substituted or unsubstituted triphenylenyl group; a substituted or unsubstituted dibenzofuran group; or a substituted or unsubstituted dibenzothiophene group.
In one embodiment of the present specification, Ar is a C6 to C60 aryl group; or a C2 to C60 heteroaryl group.
In one embodiment of the present specification, Ar is a C6 to C30 aryl group; or a C2 to C30 heteroaryl group.
In one embodiment of the present specification, Ar is a C6 to C20 aryl group; or a C2 to C20 heteroaryl group.
In one embodiment of the present specification, Ar is a phenyl group; a biphenyl group; a phenanthrenyl group; a triphenylenyl group; a dibenzofuran group; or a dibenzothiophene group.
In one embodiment of the present specification, R1 and R2 are each independently hydrogen; deuterium; a substituted or unsubstituted C1 to C60 alkyl group; a substituted or unsubstituted C6 to C60 aryl group; or a substituted or unsubstituted C2 to C60 heteroaryl group.
In one embodiment of the present specification, R1 and R2 are each independently hydrogen; deuterium; a substituted or unsubstituted C6 to C60 aryl group; or a substituted or unsubstituted C2 to C60 heteroaryl group.
In one embodiment of the present specification, R1 and R2 are each independently hydrogen; deuterium; a substituted or unsubstituted C6 to C30 aryl group; or a substituted or unsubstituted C2 to C30 heteroaryl group.
In one embodiment of the present specification, R1 and R2 are each independently hydrogen; deuterium; a C6 to C30 aryl group; or a C2 to C30 heteroaryl group.
In one embodiment of the present specification, R1 and R2 are each independently hydrogen; or deuterium.
In one embodiment of the present specification, Chemical Formula 1 may be represented by any one of the following Chemical Formulae 1-1 to 1-4.
in Chemical Formulae 1-1 to 1-4,
In one embodiment of the present specification, R21 and R22 are each independently a C1 to C10 alkyl group; or a C6 to C20 aryl group.
In one embodiment of the present specification, R21 and R22 are each independently a methyl group; or a phenyl group.
In one embodiment of the present specification, Chemical Formula 1 may be represented by any one of the following Chemical Formulae 2 to 5.
in Chemical Formulae 2 to 5,
In one embodiment of the present specification, Chemical Formula 1 may be represented by the following Chemical Formula 2-1 or 2-2.
in Chemical Formulae 2-1 and 2-2,
In one embodiment of the present specification,
of Chemical Formula 1 may be represented by any one of the following Chemical Formulae N-1 to N-3.
in Chemical Formulae N-1 to N-3,
In one embodiment of the present specification, R31 of Chemical Formulae N-1 to N-3 is a substituted or unsubstituted C6 to C30 aryl group.
In one embodiment of the present specification, R31 is a substituted or unsubstituted C6 to C20 aryl group.
In one embodiment of the present specification, R31 is a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; a substituted or unsubstituted terphenyl group; a substituted or unsubstituted naphthyl group; or a substituted or unsubstituted fluorenyl group.
In one embodiment of the present specification, R31 is a phenyl group; a biphenyl group; a terphenyl group; a naphthyl group; a fluorenyl group unsubstituted or substituted with a methyl group or a phenyl group; or 9,9′-spirobi[fluorene].
In one embodiment of the present specification, R32 of Chemical Formula N-1 is a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; or a substituted or unsubstituted naphthyl group.
In one embodiment of the present specification, R32 is a phenyl group; a biphenyl group; or a naphthyl group.
In one embodiment of the present specification, R41 and R42 of Chemical Formula N-2 are each independently a C1 to C10 alkyl group; or a C6 to C30 aryl group, and R41 and R42 may bond to each other to form a substituted or unsubstituted C3 to C30 ring.
In one embodiment of the present specification, R41 and R42 are each independently a C1 to C5 alkyl group; or a C6 to C15 aryl group, and R41 and R42 may bond to each other to form a C3 to C30 ring.
In one embodiment of the present specification, R41 and R42 are each independently a C1 to C5 alkyl group; or a C6 to C15 aryl group, and R41 and R42 may bond to each other to form a ring of
In one embodiment of the present specification, Z of Chemical Formula N-3 may be O.
In one embodiment of the present specification, Z may be S.
In one embodiment of the present specification, Z is N(R51), and R51 may be hydrogen; deuterium; a substituted or unsubstituted C1 to C10 alkyl group; or a substituted or unsubstituted C6 to C30 aryl group.
In one embodiment of the present specification, Z is N(R51), and R51 may be hydrogen; deuterium; a C1 to C10 alkyl group; or a C6 to C30 aryl group.
In one embodiment of the present specification, 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.
One embodiment of the present specification provides an organic light emitting device including a first electrode; a second electrode; and one or more organic material layers provided between the first electrode and the second electrode, wherein one or more layers of the organic material layers include one or more types of the compound represented by Chemical Formula 1.
In one embodiment of the present specification, one or more layers of the organic material layers include one type of the compound represented by Chemical Formula 1.
In one embodiment of the present specification, the first electrode may be an anode, and the second electrode may be a cathode.
In another embodiment of the present specification, the first electrode may be a cathode, and the second electrode may be an anode.
In one embodiment of the present specification, the organic light emitting device may be a blue organic light emitting device, and the compound represented by Chemical Formula 1 may be used as a material of the blue organic light emitting device. For example, the compound represented by Chemical Formula 1 may be included in a hole transfer layer or an electron blocking layer of the blue organic light emitting device.
In one embodiment of the present specification, the organic light emitting device may be a green organic light emitting device, and the compound represented by Chemical Formula 1 may be used as a material of the green organic light emitting device. For example, the compound represented by Chemical Formula 1 may be included in a hole transfer layer or an electron blocking layer of the green organic light emitting device.
In one embodiment of the present specification, the organic light emitting device may be a red organic light emitting device, and the compound represented by Chemical Formula 1 may be used as a material of the red organic light emitting device. For example, the compound represented by Chemical Formula 1 may be included in a hole transfer layer or an electron blocking layer of the red organic light emitting device.
The organic light emitting device of the present specification 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 compound described above.
The compound may be formed into an organic material layer using 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.
The organic material layer of the organic light emitting device of the present specification may be formed in a single layer structure, but may be formed in a multilayer structure in which two or more organic material layers are laminated. For example, the organic light emitting device of the present disclosure may have a structure including a hole injection layer, a hole transfer layer, a light emitting layer, an electron transfer layer, an electron injection layer and the like as the organic material layer. However, the structure of the organic light emitting device is not limited thereto, and may include a smaller number of organic material layers.
In the organic light emitting device of the present specification, the organic material layer includes a hole transfer layer, and the hole transfer layer may include the compound represented by Chemical Formula 1.
In the organic light emitting device of the present specification, the organic material layer includes an electron blocking layer, and the electron blocking layer may include the compound represented by Chemical Formula 1.
The organic light emitting device of the present disclosure may further include one, two or more layers selected from the group consisting of a light emitting layer, a hole injection layer, a hole transfer layer, an electron injection layer, an electron transfer layer, an electron blocking layer and a hole blocking layer.
The organic material layer including the compound represented by Chemical Formula 1 may further include other materials as necessary.
In the organic light emitting device according to one embodiment of the present specification, materials other than the compound represented by Chemical Formula 1 are illustrated below, however, these are for illustrative purposes only and not for limiting the scope of the present application, and these materials 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 include 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-methylthiophene), poly[3,4-(ethylene-1,2-dioxy)thiophene](PEDOT), polypyrrole and polyaniline, and the like, 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 include 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-styrenesulfonate) 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. Herein, the two or more light emitting materials may be deposited with individual sources of supply or premixed and deposited with one source of supply when 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 holes and electrons injected from an anode and a cathode, respectively, may be used alone, however, materials having a host material and a dopant material involving together in light emission may also be used.
When mixing light emitting material hosts, same series hosts may be mixed, or different series hosts may be mixed. For example, any two or more types of materials among n-type host materials or p-type host materials may be selected and used as a host material of a light emitting layer.
The organic light emitting device according to one embodiment of the present specification may be a top-emission type, a bottom-emission type or a dual-emission type depending on the materials used.
The compound according to one embodiment of the present specification may also be used in an organic electronic device including 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.
1) Preparation of Compound 2-2
DMF (dimethylformamide) (200 ml) was introduced to 11,11-dimethyl-11H-benzo[a]fluoren-6-yl trifluoromethanesulfonate (A) (20 g, 0.050 mol, 1 eq.) and NBS (N-bromosuccinimide) (9.5 g, 0.053 mol, 1.05 eq.), and the mixture was stirred for 6 hours at room temperature (RT). The reaction was terminated by introducing water thereto, and the result was extracted using MC (methylene chloride) and water. After that, moisture was removed using MgSO4. The result was separated using a silica gel column to obtain Compound 2-2 (20 g) in a 83% yield.
2) Preparation of Compound 2-3
THF (tetrahydrofuran) (240 ml) and H2O (60 ml) were introduced to Compound 2-2 (20 g, 0.042 mol, 1 eq.), phenylboronic acid (B) (5.7 g, 0.046 mol, 1.1 eq.), K2CO3 (12.9 g, 0.093 mol, 2.2 eq.) and Pd(PPh3)4 (tetrakis(triphenylphosphine)palladium(0)) (2.4 g, 0.0021 mol, 0.005 eq.), and the mixture was stirred for 6 hours at 100° C. The reaction was terminated by introducing water thereto, and the result was extracted using MC and water. After that, moisture was removed using MgSO4. The result was separated using a silica gel column to obtain Compound 2-3 (12 g) in a 70% yield.
3) Preparation of Compound 2
P(t-Bu)3 (tri-tert-butylphosphine) (0.6 g, 0.003 mol, 0.1 eq.) and toluene (120 ml) were introduced to Compound 2-3 (12 g, 0.030 mol, 1 eq.), N-phenyl-[1,1′-biphenyl]-4-amine (C) (7.7 g, 0.031 mol, 1.05 eq.), NaOtBu (sodium tert-butoxide) (4.3 g, 0.045 mol, 1.5 eq.) and Pd2(dba)3 (tris(dibenzylideneacetone)dipalladium(0)) (1.4 g, 0.0015 mol, 0.05 eq.), and the mixture was stirred for 8 hours at 100° C. The reaction was terminated by introducing water thereto, and the result was extracted using MC and water. After that, moisture was removed using MgSO4. The result was separated using a silica gel column to obtain Compound 2 (10 g) in a 59% yield.
1) Preparation of Compound 257
THF (120 ml) and H2O (30 ml) were introduced to Compound 2-3 (10 g, 0.025 mol, 1 eq.) of Preparation Example 1, N,N-diphenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (C) (10.2 g, 0.027 mol, 1.1 eq.), K2CO3 (7.6 g, 0.055 mol, 2.2 eq.) and Pd(PPh3)4 (1.4 g, 0.0012 mol, 0.005 eq.), and the mixture was stirred for 6 hours at 100° C. The reaction was terminated by introducing water thereto, and the result was extracted using MC and water. After that, moisture was removed using MgSO4. The result was separated using a silica gel column to obtain Compound 257 (10 g) in a 70% yield.
Compounds were synthesized in the same manner as in Preparation Example 1 or 2 except that Intermediates A, B and C of the following Table 1 were used instead of 11,11-dimethyl-11H-benzo[a]fluoren-6-yl trifluoromethanesulfonate (A), phenylboronic acid (B), and N-phenyl-[1,1′-biphenyl]-4-amine (C) or N,N-diphenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) aniline (C).
Compounds were prepared in the same manner as in the preparation examples, and the synthesis identification results are shown in Table 2 and Table 3. Table 2 shows measurement values of 1H NMR (CDCl3, 200 Mz), and Table 3 shows measurement values of FD-mass spectrometry (FD-Mass: field desorption mass spectrometry).
1H NMR (CDCl3, 200 Mz)
A transparent indium tin oxide (ITO) electrode thin film obtained from glass for an OLED (manufactured by Samsung-Corning Co., Ltd.) was ultrasonic cleaned using trichloroethylene, acetone, ethanol and distilled water consecutively for 5 minutes each, stored in isopropanol, and used. Next, the ITO substrate was installed in a substrate folder of a vacuum deposition apparatus, 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 apparatus.
Subsequently, the chamber was evacuated until the degree of vacuum therein reached 10−6 torr, and then 2-TNATA was evaporated by applying a current to the cell to deposit a hole injection layer having a thickness of 600 Å on the ITO substrate. To another cell in the vacuum deposition apparatus, the following N,N′-bis(α-naphthyl)-N,N′-diphenyl-4,4′-diamine (NPB) was introduced, and evaporated by applying a current to the cell 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 below was deposited thereon as a light emitting layer. Specifically, in one side cell in the vacuum deposition apparatus, H1, a blue light emitting host material, was vacuum deposited to a thickness of 200 Å, and D1, a blue light emitting dopant material, was vacuum deposited thereon by 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 employed to a thickness of 1,000 Å, and as a result, an OLED was manufactured. Meanwhile, all the organic compounds required to manufacture the OLED were vacuum sublimation purified under 10−8 torr to 10−6 torr by each material to be used in the OLED manufacture.
Organic electroluminescent devices were manufactured in the same manner as in Comparative Example 1 except that compounds shown in the following Table 4 were used instead of NPB used when forming the hole transfer layer in Comparative Example 1.
For each of the organic electroluminescent devices manufactured as above, electroluminescent (EL) properties were measured using M7000 manufactured by McScience Inc., and with the measurement results, T95 was measured when standard luminance was 700 cd/m2 through a lifetime measurement system (M6000) manufactured by McScience Inc.
Results of measuring driving voltage, light emission efficiency, color coordinate (CIE) and lifetime (T95) of the blue organic light emitting devices manufactured according to the present disclosure are as shown in Table 4.
As seen from the results of Table 4, it was identified that the organic light emitting device using the hole transfer layer material of the blue organic light emitting device of the present disclosure had lower driving voltage, and significantly improved light emission efficiency and lifetime compared to Comparative Examples 1 to 8. When comparing the comparative examples of Table 4 and the compounds of the present disclosure, having an arylamine group is similar, however, there is a difference in that the fluorene group has an additional substituent. A fluorene group having a substituent suppresses pi-pi stacking of the aromatic ring, which prevents degrading device properties caused by increasing a driving voltage of an organic light emitting device. Accordingly, it is considered that the compound of the present disclosure using such a derivative enhances hole transfer properties or stability resulting in superiority in all aspects of driving voltage, efficiency and lifetime.
A transparent indium tin oxide (ITO) electrode thin film obtained from glass for an OLED (manufactured by Samsung-Corning Co., Ltd.) was ultrasonic cleaned using trichloroethylene, acetone, ethanol and distilled water consecutively for 5 minutes each, stored in isopropanol, and used. Next, the ITO substrate was installed in a substrate folder of a vacuum deposition apparatus, 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 apparatus.
Subsequently, the chamber was evacuated until the degree of vacuum therein reached 10−6 torr, and then 2-TNATA was evaporated by applying a current to the cell to deposit a hole injection layer having a thickness of 600 Å on the ITO substrate. To another cell in the vacuum deposition apparatus, the following N,N′-bis(α-naphthyl)-N,N′-diphenyl-4,4′-diamine (NPB) was introduced, and evaporated by applying a current to the cell 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 below was deposited thereon as a light emitting layer. Specifically, in one side cell in the vacuum deposition apparatus, H1, a blue light emitting host material, was vacuum deposited to a thickness of 200 Å, and D1, a blue light emitting dopant material, was vacuum deposited thereon by 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 employed to a thickness of 1,000 Å, and as a result, an OLED was manufactured. Meanwhile, all the organic compounds required to manufacture the OLED were vacuum sublimation purified under 10−8 torr to 10−6 torr by each material to be used in the OLED manufacture.
Organic electroluminescent devices were manufactured in the same manner as in Comparative Example 9 except that an electron blocking layer was formed to a thickness of 50 Å on the hole transfer layer using compounds described in the following Table 5 after forming the hole transfer layer NPB to a thickness of 250 Å in Comparative Example 9.
For each of the organic electroluminescent devices manufactured as above, electrolumines cent (EL) properties were measured using M7000 manufactured by McScience Inc., and with the measurement results, T95 was measured when standard luminance was 700 cd/m2 through a lifetime measurement system (M6000) manufactured by McScience Inc.
Results of measuring driving voltage, light emission efficiency, color coordinate (CIE) and lifetime (T95) of the blue organic light emitting devices manufactured according to the present disclosure are as shown in the following Table 5.
As seen from the results of Table 5, the organic light emitting device using the electron blocking layer material of the blue organic light emitting device of the present disclosure had lower driving voltage, and significantly improved light emission efficiency and lifetime compared to the comparative examples. When electrons pass through a hole transfer layer and move to an anode without binding in a light emitting layer, efficiency and lifetime of an OLED are reduced. When using a compound having a high LUMO level as an electron blocking layer in order to prevent such a phenomenon, electrons to pass through a light emitting layer and move to an anode are blocked by an energy barrier of the electron blocking layer. Accordingly, holes and electrons are very likely to form excitons increasing possibility of emitting as light in the light emitting layer, and accordingly, the compound is considered to bring superiority in all aspects of driving voltage, efficiency and lifetime.
Particularly, it was identified that, when using an amine derivative as the hole transfer layer in the compound of Chemical Formula 1 of the present application, the unshared electron pair of the amine improved the flow of holes enhancing a hole transfer ability of the hole transfer layer, and when used as the electron blocking layer, deterioration of the hole transfer material caused by electrons invading the hole transfer layer was suppressed, and in addition, planarity and glass transition temperature of the amine derivative increased by the substituent with strengthened hole properties and the amine site bonding to each other, which increased thermal stability of the compound.
In addition, it was identified that hole transfer ability was enhanced and molecular stability increased as well through adjusting band gap and T1 values, and as a result, driving voltage of the device was lowered, light efficiency was enhanced, and lifetime properties of the device was enhanced by thermal stability of the compound.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2020-0122102 | Sep 2020 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2021/012032 | 9/6/2021 | WO |
