Patent Application
20240025872
The present specification relates to a compound, and an organic light emitting device including the same.
The present specification claims priority to and the benefits of Korean Patent Application No. 10-2020-0154756, filed with the Korean Intellectual Property Office on Nov. 18, 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,
Another embodiment of the present specification 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 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 in an organic light emitting device. Particularly, the compound can be used as a material of a hole transfer layer, an electron blocking layer or a prime layer.
When using the compound of Chemical Formula 1 as a material of a hole transfer layer, an electron blocking layer or a prime layer of an organic light emitting device, an organic light emitting device having superior properties in terms of driving voltage and lifetime can be provided.
Specifically, hole properties are strengthened by, as in the compound of Chemical Formula 1, the benzene ring in the fluorene skeleton not further fused with a benzene ring being substituted with two substituents including an amine group, and an effect of providing an organic light emitting device having superior efficiency can be provided when used as a material of a hole transfer layer, an electron blocking layer or a prime layer through adjusting a band gap and a T1 value (energy level value in triplet state). Particularly, when substituted with an aryl group together with the amine group, an organic light emitting device having low driving voltage, high light emission efficiency and long lifetime can be provided by accelerating hole mobility.
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.
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; a halogen group; 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 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 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 0, 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 selected from among 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, the following compounds and the like may be included, however, the structure is not limited thereto.
(dimethylfluorenyl group),
(diphenylfluorenyl group),
(9,9′-spirobi[fluorene])
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. When the heteroaryl group is dicyclic or higher, the number of carbon atoms may be from 4 to 60, 4 to 40 or 4 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 and 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 heteroaryl 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 used. 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 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, Chemical Formula 1 may be represented by any one of the following Chemical Formulae 1-1 to 1-3.
In Chemical Formulae 1-1 to 1-3,
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, each substituent has the same definition as in Chemical Formula 1.
In one embodiment of the present specification, L1 and L2 may be each independently a direct bond; or a C6 to C60 arylene group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, L1 and L2 may be each independently a direct bond; or a C6 to C30 arylene group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, L1 and L2 may be each independently a direct bond; or a C6 to C60 arylene group.
In one embodiment of the present specification, L1 and L2 may all be a direct bond.
In an embodiment of the present specification, L1 is a direct bond, and L2 may be a C6 to C30 arylene group unsubstituted or substituted with deuterium.
In an embodiment of the present specification, L1 is a direct bond, and L2 may be a phenylene group unsubstituted or substituted with deuterium.
In an embodiment of the present specification, L1 is a direct bond, and L2 may be a C6 to C30 arylene group.
In an embodiment of the present specification, L1 is a direct bond, and L2 may be a phenylene group.
In an embodiment of the present specification, L1 is a C6 to C30 arylene group unsubstituted or substituted with deuterium, and L2 may be a direct bond.
In an embodiment of the present specification, L1 is a C6 to C30 arylene group, and L2 may be a direct bond.
In an embodiment of the present specification, L1 is a phenylene group unsubstituted or substituted with deuterium; a biphenylene group unsubstituted or substituted with deuterium; a naphthylene group unsubstituted or substituted with deuterium; or a dimethylfluorenylene group unsubstituted or substituted with deuterium, and L2 may be a phenylene group unsubstituted or substituted with deuterium.
In an embodiment of the present specification, L1 is a phenylene group; a biphenylene group; a naphthylene group; or a dimethylfluorenylene group, and L2 may be a phenylene group.
In one embodiment of the present specification, L11 and L12 are each independently a direct bond; or a C6 to C60 arylene group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, L11 and L12 may be each independently a direct bond; or a C6 to C60 arylene group.
In one embodiment of the present specification, L11 and L12 may all be a direct bond.
In an embodiment of the present specification, L11 is a C6 to C60 arylene group unsubstituted or substituted with deuterium, and L12 may be a direct bond.
In an embodiment of the present specification, L11 is a C6 to C30 arylene group unsubstituted or substituted with deuterium, and L12 may be a direct bond.
In an embodiment of the present specification, L11 is a phenylene group unsubstituted or substituted with deuterium, and L12 may be a direct bond.
In an embodiment of the present specification, L11 is a C6 to C60 arylene group, and L12 may be a direct bond.
In an embodiment of the present specification, L11 is a C6 to C30 arylene group, and L12 may be a direct bond.
In an embodiment of the present specification, L11 is a phenylene group, and L12 may be a direct bond.
In an embodiment of the present specification, L11 is a direct bond, and L12 may be a C6 to C60 arylene group unsubstituted or substituted with deuterium.
In an embodiment of the present specification, L11 is a direct bond, and L12 may be a C6 to C30 arylene group unsubstituted or substituted with deuterium.
In an embodiment of the present specification, L11 is a direct bond, and L12 may be a phenylene group unsubstituted or substituted with deuterium.
In an embodiment of the present specification, L11 is a direct bond, and L12 may be a C6 to C60 arylene group.
In an embodiment of the present specification, L11 is a direct bond, and L12 may be a C6 to C30 arylene group.
In an embodiment of the present specification, L11 is a direct bond, and L12 may be a phenylene group.
In one embodiment of the present specification, L11 and L12 may all be a C6 to C60 arylene group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, L11 and L12 may all be a C6 to C30 arylene group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, L11 and L12 may all be a C6 to C10 arylene group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, L11 and L12 may all be a phenylene group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, L11 and L12 may all be a C6 to C60 arylene group.
In one embodiment of the present specification, L11 and L12 may all be a C6 to C30 arylene group.
In one embodiment of the present specification, L11 and L12 may all be a C6 to C10 arylene group.
In one embodiment of the present specification, L11 and L12 may all be a phenylene group.
In one embodiment of the present specification, R11 and R12 are each independently 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.
In one embodiment of the present specification, R11 and R12 are each independently a substituted or unsubstituted C3 to C40 cycloalkyl group; a substituted or unsubstituted C6 to C40 aryl group; or a substituted or unsubstituted C2 to C40 heteroaryl group.
In one embodiment of the present specification, R11 and R12 are each independently a substituted or unsubstituted C3 to C30 cycloalkyl group; a substituted or unsubstituted C6 to C30 aryl group; or a substituted or unsubstituted C2 to C20 heteroaryl group.
In one embodiment of the present specification, R11 and R12 are each independently a substituted or unsubstituted adamantane group; 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; a substituted or unsubstituted dibenzothiophene group; or a substituted or unsubstituted naphthobenzofuran group.
In one embodiment of the present specification, R11 and R12 are each independently an adamantane group unsubstituted or substituted with deuterium; a phenyl group unsubstituted or substituted with one or more substituents of deuterium, a cycloalkyl group, an aryl group and a heteroaryl group; a biphenyl group unsubstituted or substituted with deuterium; a terphenyl group unsubstituted or substituted with deuterium; a naphthyl group unsubstituted or substituted with deuterium; a fluorenyl group unsubstituted or substituted with one or more substituents of deuterium, an alkyl group and an aryl group; 9,9′-spirobi[fluorene] unsubstituted or substituted with deuterium; a dibenzofuran group unsubstituted or substituted with deuterium; a dibenzothiophene group unsubstituted or substituted with deuterium; or a naphthobenzofuran group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, R11 is a substituted or unsubstituted C6 to C60 aryl group; or a C2 to C60 heteroaryl group substituted or unsubstituted and including O or S, and R12 may be a substituted or unsubstituted C3 to C60 cycloalkyl group; a substituted or unsubstituted C6 to C60 aryl group; or a C2 to C60 heteroaryl group substituted or unsubstituted and including 0 or S.
In one embodiment of the present specification, R11 is a substituted or unsubstituted C6 to C30 aryl group; or a C2 to C30 heteroaryl group substituted or unsubstituted and including O or S, and R12 may be a substituted or unsubstituted C3 to C30 cycloalkyl group; a substituted or unsubstituted C6 to C30 aryl group; or a C2 to C30 heteroaryl group substituted or unsubstituted and including 0 or S.
In one embodiment of the present specification, R11 is a C6 to C30 aryl group unsubstituted or substituted with one or more substituents of deuterium, an alkyl group and an aryl group; or a C2 to C30 heteroaryl group unsubstituted or substituted with deuterium and including 0 or S, and R12 may be a C3 to C30 cycloalkyl group unsubstituted or substituted with deuterium; a C6 to C30 aryl group unsubstituted or substituted with one or more substituents of deuterium, an alkyl group, an aryl group and a heteroaryl group; or a C2 to C30 heteroaryl group unsubstituted or substituted with deuterium and including O or S.
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 substituted or unsubstituted anthracenyl 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 is a phenyl group unsubstituted or substituted with deuterium; a biphenyl group unsubstituted or substituted with deuterium; a terphenyl group unsubstituted or substituted with deuterium; a naphthyl group unsubstituted or substituted with deuterium; an anthracenyl group unsubstituted or substituted with deuterium; a fluorenyl group unsubstituted or substituted with one or more substituents of deuterium, an alkyl group and an aryl group; a dibenzofuran group unsubstituted or substituted with deuterium; or a dibenzothiophene group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, R12 is a substituted or unsubstituted adamantane group; 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 anthracenyl group; a substituted or unsubstituted fluorenyl group; a substituted or unsubstituted dibenzofuran group; a substituted or unsubstituted dibenzothiophene group; or a substituted or unsubstituted naphthobenzofuran group.
In one embodiment of the present specification, R12 is a phenyl group unsubstituted or substituted with one or more substituents of deuterium and a heteroaryl group; a biphenyl group unsubstituted or substituted with deuterium; a terphenyl group unsubstituted or substituted with deuterium; a naphthyl group unsubstituted or substituted with deuterium; an anthracenyl group unsubstituted or substituted with deuterium; a fluorenyl group unsubstituted or substituted with one or more substituents of deuterium, an alkyl group and an aryl group; 9,9′-spirobi[fluorene] unsubstituted or substituted with deuterium; a dibenzofuran group unsubstituted or substituted with deuterium; a dibenzothiophene group unsubstituted or substituted with deuterium; or a naphthobenzofuran group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, when R11 is a dimethylfluorenyl group, R11 and R12 are different from each other.
In one embodiment of the present specification, when R11 is a dimethylfluorenyl group, R12 is a C3 to C30 cycloalkyl group; a substituted or unsubstituted C6 to C12 aryl group; a diphenylfluorenyl group unsubstituted or substituted with deuterium; 9,9′-spirobi[fluorene] unsubstituted or substituted with deuterium; a C18 to C60 aryl group unsubstituted or substituted with deuterium; or a heteroaryl group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, when R11 is a dimethylfluorenyl group, R12 cannot be a dimethylfluorenyl group. In other words, R11 and R12 cannot both be a dimethylfluorenyl group.
In one embodiment of the present specification, the
structure of Chemical Formula 1 may be represented by the following Chemical Formula 3-1 or 3-2.
In Chemical Formulae 3-1 and 3-2, L1, L11, L12, 11, 111 and 112 have the same definitions as in Chemical Formula 1, H11 is hydrogen; or deuterium, h11 is an integer of 0 to 7, and when 2 or greater, H11s are the same as or different from each other, R31 is a substituted or unsubstituted C6 to C12 aryl group; or a C2 to C30 heteroaryl group substituted or unsubstituted and including 0 or S, R32 is a substituted or unsubstituted C3 to C30 cycloalkyl group; a substituted or unsubstituted C6 to C30 aryl group; or a C2 to C30 heteroaryl group substituted or unsubstituted and including 0 or S, R33 is a C13 to C30 aryl group unsubstituted or substituted with deuterium or an aryl group; or a C2 to C30 heteroaryl group substituted or unsubstituted and including 0 or S, R41 and R42 are each independently a C1 to C10 alkyl group unsubstituted or substituted with deuterium, and
means a position bonding to Chemical Formula 1.
In one embodiment of the present specification, Ar is a substituted or unsubstituted C6 to C30 aryl group; a C2 to C30 heteroaryl group substituted or unsubstituted and including 0 or S; or a C2 to C30 heteroaryl group substituted or unsubstituted and including C═N.
In one embodiment of the present specification, Ar is a substituted or unsubstituted C6 to C30 aryl group; or a C2 to C30 heteroaryl group substituted or unsubstituted and including O or S.
In one embodiment of the present specification, Ar is a C6 to C30 aryl group unsubstituted or substituted with deuterium; or a C2 to C30 heteroaryl group unsubstituted or substituted with deuterium and including 0 or S.
In one embodiment of the present specification, Ar is a phenyl group unsubstituted or substituted with deuterium or a heteroaryl group; a biphenyl group unsubstituted or substituted with deuterium; a terphenyl group unsubstituted or substituted with deuterium; a naphthyl group unsubstituted or substituted with deuterium; a phenanthrenyl group unsubstituted or substituted with deuterium; a phenalenyl group unsubstituted or substituted with deuterium; a fluorenyl group unsubstituted or substituted with one or more substituents of deuterium, an alkyl group and an aryl group; 9,9′-spirobi[fluorene] unsubstituted or substituted with deuterium; a dibenzofuran group unsubstituted or substituted with deuterium; or a dibenzothiophene group unsubstituted or substituted with deuterium.
In one embodiment of the present specification, Ar is a phenyl group unsubstituted or substituted with deuterium or a heteroaryl group; a substituted or unsubstituted biphenyl group; a substituted or unsubstituted terphenyl group; a substituted or unsubstituted naphthyl group; a substituted or unsubstituted phenanthrenyl group; a substituted or unsubstituted phenalenyl 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, Ar is a phenyl group unsubstituted or substituted with deuterium or a dibenzofuran group; a biphenyl group; a terphenyl group; a naphthyl group; a phenanthrenyl group; a phenalenyl group; a dimethylfluorenyl group; a diphenylfluorenyl group; 9,9′-spirobi[fluorene]; a dibenzofuran group; or a dibenzothiophene group.
In one embodiment of the present specification, R1 is 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 is hydrogen; or deuterium.
In one embodiment of the present specification,
of Chemical Formula 1 bond to No. 1 and No. 4 positions of
For example, when
bonds to a No. 1 position of
bonds to a No. 4 position of
and vice versa.
In another embodiment,
of Chemical Formula 1 bond to No. 1 and No. 3 positions of
In another embodiment,
of Chemical Formula 1 bond to No. 1 and No. 2 positions of
In another embodiment,
of Chemical Formula 1 bond to No. 2 and No. 4 positions of
In another embodiment,
of Chemical Formula 1 bond to No. 2 and No. 3 positions of
In another embodiment,
of Chemical Formula 1 bond to No. 3 and No. 4 positions of
In one embodiment of the present specification, when Chemical Formula 1 is represented by Chemical Formula 1-1 or 1-2 and
bond to No. 1 and No. 4 positions of
any one of the following i to iv may be satisfied.
includes deuterium.
In one embodiment of the present specification, when Chemical Formula 1 is represented by Chemical Formula 1-3 and
bond to No. 1 and No. 4 positions of
R11 and R12 may be each independently a substituted or unsubstituted adamantane group; 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 anthracenyl group; a substituted or unsubstituted fluorenyl group; a substituted or unsubstituted dibenzofuran group; a substituted or unsubstituted dibenzothiophene group; or a substituted or unsubstituted naphthobenzofuran group.
In one embodiment of the present specification, Chemical Formula 1 has a deuterium content of 0% to 100%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of 0%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of greater than 0% and less than or equal to 100%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of 5% to 100%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of 10% to 100%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of 20% to 100%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of 50% to 100%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of 0%, or 5% to 100%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of 0%, or 10% to 100%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of 0%, or 20% to 100%.
In one embodiment of the present specification, Chemical Formula 1 may have a deuterium content of 0%, or 50% to 100%.
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 the compound of 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 of Chemical Formula 1 may be used as a material of the blue organic light emitting device. For example, the compound of 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 of Chemical Formula 1 may be used as a material of the green organic light emitting device. For example, the compound of 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 of Chemical Formula 1 may be used as a material of the red organic light emitting device. For example, the compound of 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 of 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 of Chemical Formula 1.
In the organic light emitting device of the present specification, the organic material layer includes a prime layer, and the prime layer may include the compound of Chemical Formula 1. The prime layer is provided between a hole transfer layer and a light emitting layer, and is also referred to as a hole transfer auxiliary layer. By forming a prime layer between a hole transfer layer and a light emitting layer, holes are more smoothly transferred from the hole transfer layer to the light emitting layer, which traps excitons in the light emitting layer and thereby prevents light emission leakage, and as a result, an effect of obtaining an organic electroluminescent device having superior light emission efficiency is obtained.
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, a prime 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 of 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 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 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.
In one embodiment of the present specification, a compound including anthracene may be used as the host material, however, the host material is not limited thereto.
In one embodiment of the present specification, a pyrene derivative including diamine may be used as the dopant material, however, the dopant material is not limited thereto.
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 19-2
2-Iodonaphthalen-1-ol (E) (10 g, 44.8 mmol) and (6-bromo-3-chloro-2-fluorophenyl)boronic acid (F) (11.35 g, 44.8 mmol) were dispersed into toluene (110 ml), ethanol (20 ml) and water (20 ml), then K2CO3 (12.3 g, 89.6 mmol) was added thereto, then tetrakis(triphenylphosphine)palladium(0) [Pd(PPh3)4] (0.51 g, 1 mol %) was introduced thereto, and the mixture was stirred for 6 hours under reflux. The temperature was lowered to room temperature, the water layer was separated, and the organic layer was washed once again with water to separate the organic layer. Anhydrous magnesium sulfate was introduced to the collected organic layer for slurrification, and the result was filtered and vacuum concentrated. The compound in an oil state was separated through silica chromatography using a combination of hexane and ethyl acetate to prepare Compound 19-2 (19.3 g, yield 65%).
(2) Preparation of Compound 19-3
Compound 19-2 (9.28 g, 26 mmol) was diluted in N-methyl-2-pyrrolidone (NMP) (50 ml), potassium carbonate (5.47 g, 39.6 mmol) was introduced thereto, and the mixture was heated to 140° C. After approximately 1 hour, the reaction material was cooled to room temperature, and slowly introduced to water (500 ml). Precipitated solids were filtered and dissolved in tetrahydrofuran (THF), then treated with anhydrous magnesium sulfate, and the result was filtered and then vacuum concentrated. The concentrated compound was slurried with a small amount of tetrahydrofuran and excess hexane, and filtered. For purification, the filtered compound was separated through silica chromatography using hexane and ethyl acetate to prepare Compound 19-3 (5.2 g, 63%).
(3) Preparation of Compound 19-4
Compound 19-3 (5.2 g, 15.6 mmol) and phenylboronic acid (G) (2 g, 17 mmol) were dissolved in 1,4-dioxane (50 ml) and H2O (10 ml), and after introducing Pd(PPh3)4 (0.9 g, 0.78 mmol) and K2CO3 (5.38 g, 39 mol) thereto, the mixture was stirred for 5 hours under reflux. After the reaction was completed, methylene chloride (MC) (100 ml) and water (150 ml) were introduced to the reaction solution for work up, and the result was introduced to a separatory funnel to separate the organic layer. The organic layer was dried with anhydrous MgSO4, and after removing the solvent using a rotary evaporator, the result was purified by column chromatography (MC:hexane=1:3) to obtain Compound 19-4 (4.35 g, 85%).
(4) Preparation of Compound 19
After dissolving Compound 19-4 (4.35 g, 13.2 mmol) and di([1,1′-biphenyl]-4-yl)amine (I) (4.67 g, 14.5 mmol) in xylene (80 ml), tris(dibenzylideneacetone)dipalladium(0) [Pd2 (dba)3](0.6 g, 0.66 mmol), tri-tert-butylphosphine [P(t-Bu)3] (0.6 ml, 1.32 mmol) and sodium tert-butoxide [NaOt-Bu] (3.8 g, 39 mol) were introduced thereto, and the mixture was stirred for 5 hours under reflux at 125° C. After the reaction was completed, MC was introduced to the reaction solution for dissolution, and the result was extracted with distilled water. The organic layer was dried with anhydrous magnesium sulfate, and after removing the solvent using a rotary evaporator, the result was purified by column chromatography (MC:hexane=1:3) to obtain Compound 19 (5.1 g, 63%).
Target Compound A was synthesized in the same manner as in Preparation Example 1 except that Intermediates E, F, G and I of the following Table 1 were used instead of (E), (F), (G) and (I).
(1) Preparation of Compound 652-3
2-Iodonaphthalen-1-ol (30 g, 111.08 mnmol) (A), (3-bromo-6-chloro-2-fluoro-phenyl)boronic acid (30.95 g, 122.19 mnmol) (B), Pd(PPh3)4 (389.84 g, 555.41 mnmol) and potassium carbonate (46.06 g, 333.25 mnmol) were introduced to toluene (600 mL), ethanol (150 mL) and water (150 mL), and stirred for 6 hours under reflux. The temperature was lowered to room temperature, the water layer was separated, and the organic layer was washed once again with water to separate the organic layer. Anhydrous magnesium sulfate was introduced to the collected organic layer for slurrification, and the result was filtered and vacuum concentrated. The compound in an oil state was separated through silica chromatography using a combination of hexane and ethyl acetate to obtain Compound 652-3 (30 g, 85.324 mmol, 76.812% yield).
(2) Preparation of Compound 652-2
Compound 652-3 (30 g, 85.32 mmol) and potassium carbonate (17.69 g, 127.99 mmol) were introduced to NMP (150 mL), and heated to 140° C. After approximately 1 hour, the reaction material was cooled to room temperature, and slowly introduced to water (500 ml). Precipitated solids were filtered and dissolved in THF, then treated with anhydrous magnesium sulfate, and the result was filtered and then vacuum concentrated. The concentrated compound was slurried with a small amount of THF and excess hexane, and filtered. For purification, the filtered compound was separated through silica chromatography using hexane and ethyl acetate to obtain Compound 652-2 (28 g, 84.442 mmol, 98.966% yield).
(3) Preparation of Compound 652-1
Compound 652-2 (28 g, 84.44 mmol), [1,1′-biphenyl]-4-ylboronic acid (18.39 g, 92.89 mmol) (C), Pd(PPh3)4 (2.96 g, 4.22 mmol) and potassium carbonate (35.01 g, 253.32 mmol) were introduced to 1,4-dioxane (600 mL) and water (150 mL), and stirred for 5 hours under reflux. After the reaction was completed, MC (100 ml) and water (150 ml) were introduced to the reaction solution for work up, and the result was introduced to a separatory funnel to separate the organic layer. The organic layer was dried with anhydrous MgSO4, and after removing the solvent using a rotary evaporator, the result was purified by column chromatography (MC:hexane=1:3) to obtain Compound 652-1 (30 g, 74.094 mmol, 87.746% yield).
(4) Preparation of Compound 652
Compound 652-1 (30 g, 74.09 mmol), 3,5-diphenyl-N-(4-phenylphenyl)aniline (25.52 g, 64.1 mmol), Pd2(dba)3 (2.6 g, 3.7 mmol), Xphos (2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl) (4.01 mL, 7.41 mmol) and NaOt-Bu (21.81 g, 222.28 mmol) were introduced to xylene (150 mL), and stirred for 5 hours under reflux at 125° C. After the reaction was completed, MC was introduced to the reaction solution for dissolution, and the result was extracted with distilled water. The organic layer was dried with anhydrous magnesium sulfate, and after removing the solvent using a rotary evaporator, the result was purified by column chromatography (MC:hexane=1:3) to obtain Compound 652 (42 g, 60.884 mmol, 82.171% yield).
Compounds were synthesized in the same manner as in Preparation Example 2 except that Intermediates A, B, C and D of the following Table 2 were used instead of (A), (B), (C) and (D).
Compound 652 (10 g, 0.013 mol) and
trifluoromethanesulfonic acid (triflic acid) (8.78 mL, 99.46 mnmol) were dissolved in D6-benzene (100 ml), and stirred for 4 hours at 60° C. After the reaction was terminated, the result was neutralized using an aqueous K3PO4 solution at room temperature, and then extracted with dichloromethane (DCM) and distilled water (H2O).
The reaction material extracted once again was purified by column chromatography (DCM:Hex=1:1), and recrystallized with methanol to obtain Compound 984 (9 g, 0.0111 mol, 85.7% yield).
Herein, Hex means hexane, and DCM:Hex means a volume ratio.
Compound 971 (10 g, 0.014 mol) and triflic acid (8.78 mL, 99.46 mmol) were dissolved in D6-benzene (100 ml), and stirred for 4 hours at 60° C. After the reaction was terminated, the result was neutralized using an aqueous K3PO4 solution at room temperature, and then extracted with DCM and water (H2O).
The reaction material extracted once again was purified by column chromatography (DCM:Hex=1:1), recrystallized with methanol, and extracted with dichloromethane/H2O. The reaction material was purified by column chromatography (DCM:Hex=1:1), and recrystallized with methanol to obtain Compound 1013 (8 g, 0.0112 mol, 80% yield).
Compounds were prepared in the same manner as in Preparation Examples 1 to 4, and the synthesis identification results are shown in Table 3 and Table 4. Table 3 shows measurement values of 1H NMR (CDCl3, 200 Mz), and Table 4 shows measurement values of FD-mass spectrometry (FD-Mass: field desorption mass spectrometry).
1H NMR (CDCl3, 200 Mz)
1) Manufacture of Organic Light Emitting Device
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 deposited 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 5 were used instead of NPB used when forming the hole transfer layer.
2) Evaluation on Organic Light Emitting Device
For each of the organic light emitting 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 5.
As seen from the results of Table 5, 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 the comparative examples.
Particularly, it was identified that, when using an amine derivative as the hole transfer layer in the compound 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 by the substituent with strengthened hole properties and the amine site bonding to each other, planarity and glass transition temperature of the amine derivative increased, 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 a band gap and a T1 (energy level value in a triplet state) value, and as a result, driving voltage of the device was lowered, light efficiency was enhanced, and lifetime properties of the device were enhanced by thermal stability of the compound.
Specifically, it was identified that, when using a compound like the compound represented by Chemical Formula 1 of the present application having two substituents, that is, an amine group substituted with one or more aryl groups and an aryl group, or an amine group substituted with one or more aryl groups and a heteroaryl group including 0 or S, on one side phenyl of the naphthobenzofuran core in the hole transfer layer, the aryl group substituting the amine group delocalized a HOMO (Highest Occupied Molecular Orbital) energy level of the compound stabilizing the HOMO energy, and superior light emission efficiency and lifetime were obtained.
1) Manufacture of Organic Light Emitting Device
Organic electroluminescent devices were manufactured in the same manner as in Comparative Example 1 except that, after forming the hole transfer layer NPB to a thickness of 250 Å, an electron blocking layer was formed on the hole transfer layer to a thickness of 50 Å using compounds described in the following Table 5.
2) Evaluation on Organic Light Emitting Device
For each of the organic light emitting 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 of the blue organic light emitting devices manufactured according to the present disclosure are as shown in the following Table 6.
As seen from the results of Table 6, 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 it is considered that the compound of the present disclosure brings superiority in all aspects of driving, efficiency and lifetime.
Particularly, it was identified that, when using the compound of Chemical Formula 1 of the present application 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 a band gap and a T1 value, and as a result, driving voltage of the device was lowered, light efficiency was enhanced, and lifetime properties of the device were enhanced by thermal stability of the compound.
1) Manufacture of Organic Light Emitting Device
A glass substrate on which ITO was coated as a thin film to a thickness of 1,500 Å was cleaned with distilled water 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 conducted for 5 minutes using UV in a UV cleaner. After that, the substrate was transferred to a plasma cleaner (PT), and after conducting plasma treatment under vacuum for ITO work function and residual film removal, the substrate was transferred to a thermal deposition apparatus for organic deposition.
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 A on the hole injection layer.
After that, a compound described in the following Table 7 was deposited to 100 Å to form a prime layer.
A light emitting layer was thermal vacuum deposited thereon as follows. As the light emitting layer, a compound of 9-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-9′-phenyl-3,3′-Bi-9H-carbazole was deposited to 400 Å as a host, and as a green phosphorescent dopant, Ir(ppy)3 was doped by 7% and deposited. After that, BCP was deposited to 60 Å as a hole blocking layer, and Alq3 was deposited to 200 Å thereon as an electron transfer layer.
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, and as a result, an organic light emitting device was manufactured.
Meanwhile, all the organic compounds required to manufacture the organic light emitting device were vacuum sublimation purified under 10−8 torr to 10−6 torr for each material to be used in the organic light emitting device manufacture.
2) Evaluation on Organic Light Emitting Device
For each of the organic light emitting devices of Comparative Examples 14 to 19 and Examples 77 to 124 manufactured as above, electroluminescent (EL) properties were measured using M7000 manufactured by McScience Inc., and with the measurement results, a lifetime T90 (unit: h, hour), time taken to become 90% with respect to initial luminance, was measured when standard luminance was 6,000 cd/m2 through a lifetime measurement system (M6000) manufactured by McScience Inc. The measurement results are shown in the following Table 7.
As seen from the results of Table 7, it was identified that the organic light emitting devices of Examples 77 to 124 using the compound according to the present application when forming the prime layer effectively prevented electrons from coming over from the opposite side of the hole transfer layer by having a structure in which naphthobenzofuran is substituted with two specific substituents including an amine group and thereby stabilizing HOMO (Highest Occupied Molecular Orbital) energy through delocalizing the HOMO energy level, and resultantly had superior light emission efficiency and lifetime compared to the organic light emitting devices of Comparative Examples 14 to 19 not using the compound according to the present application when forming the prime layer.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2020-0154756 | Nov 2020 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2021/014930 | 10/22/2021 | WO |
