CN113594395A - Organic electroluminescent device - Google Patents
Organic electroluminescent device Download PDFInfo
- Publication number
- CN113594395A CN113594395A CN202110990159.2A CN202110990159A CN113594395A CN 113594395 A CN113594395 A CN 113594395A CN 202110990159 A CN202110990159 A CN 202110990159A CN 113594395 A CN113594395 A CN 113594395A
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- Prior art keywords
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- organic electroluminescent
- electroluminescent device
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- 229910052742 iron Inorganic materials 0.000 description 1
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- XIXADJRWDQXREU-UHFFFAOYSA-M lithium acetate Chemical compound [Li+].CC([O-])=O XIXADJRWDQXREU-UHFFFAOYSA-M 0.000 description 1
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- DCZNSJVFOQPSRV-UHFFFAOYSA-N n,n-diphenyl-4-[4-(n-phenylanilino)phenyl]aniline Chemical class C1=CC=CC=C1N(C=1C=CC(=CC=1)C=1C=CC(=CC=1)N(C=1C=CC=CC=1)C=1C=CC=CC=1)C1=CC=CC=C1 DCZNSJVFOQPSRV-UHFFFAOYSA-N 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- NIHNNTQXNPWCJQ-UHFFFAOYSA-N o-biphenylenemethane Natural products C1=CC=C2CC3=CC=CC=C3C2=C1 NIHNNTQXNPWCJQ-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 125000002971 oxazolyl group Chemical group 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920003227 poly(N-vinyl carbazole) Polymers 0.000 description 1
- 229920000548 poly(silane) polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
- 239000011698 potassium fluoride Substances 0.000 description 1
- 235000003270 potassium fluoride Nutrition 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- LVTJOONKWUXEFR-FZRMHRINSA-N protoneodioscin Natural products O(C[C@@H](CC[C@]1(O)[C@H](C)[C@@H]2[C@]3(C)[C@H]([C@H]4[C@@H]([C@]5(C)C(=CC4)C[C@@H](O[C@@H]4[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@@H](O)[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@H](CO)O4)CC5)CC3)C[C@@H]2O1)C)[C@H]1[C@H](O)[C@H](O)[C@H](O)[C@@H](CO)O1 LVTJOONKWUXEFR-FZRMHRINSA-N 0.000 description 1
- 125000003373 pyrazinyl group Chemical group 0.000 description 1
- 125000005548 pyrenylene group Chemical group 0.000 description 1
- 125000002294 quinazolinyl group Chemical group N1=C(N=CC2=CC=CC=C12)* 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000011775 sodium fluoride Substances 0.000 description 1
- 235000013024 sodium fluoride Nutrition 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical class C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000547 substituted alkyl group Chemical group 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 125000005346 substituted cycloalkyl group Chemical group 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
- 125000000335 thiazolyl group Chemical group 0.000 description 1
- 125000005556 thienylene group Chemical group 0.000 description 1
- 125000005730 thiophenylene group Chemical group 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 125000005259 triarylamine group Chemical group 0.000 description 1
- 125000003960 triphenylenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C3=CC=CC=C3C12)* 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
- H10K85/633—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
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- H10K50/00—Organic light-emitting devices
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- H10K50/14—Carrier transporting layers
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- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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- H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
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- H10K85/624—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing six or more rings
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- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/626—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
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Abstract
The invention provides an organic electroluminescent device, and relates to the technical field of organic electroluminescence. The organic electroluminescent device comprises a hole transport layer, an electron transport layer and an optional covering layer. The specific hole transport layer material and the specific electron transport layer material are matched and applied to the organic electroluminescent device, so that the transport efficiency of holes and electrons in the device is improved, the maximum combination of current carriers is realized, the luminous efficiency of the organic electroluminescent device is improved, and the driving voltage of the device can be reduced; in addition, the use of the covering layer material is increased, the total reflection loss and the waveguide loss in the OLED device are effectively reduced, and the light extraction efficiency is improved, so that the luminous efficiency of the organic electroluminescent device is better improved, and the organic electroluminescent device has good application effect and industrialization prospect. The organic light emitting diode can be widely applied to the fields of panel display, lighting sources, organic solar cells, organic photoreceptors or organic thin film transistors and the like.
Description
Technical Field
The invention relates to the technical field of organic electroluminescence, in particular to an organic electroluminescent device.
Background
As a novel display technology, the organic electroluminescent device has the unique advantages of self luminescence, wide viewing angle, low energy consumption, high efficiency, thinness, rich colors, high response speed, wide applicable temperature range, low driving voltage, capability of manufacturing flexible, bendable and transparent display panels, environmental friendliness and the like, and can be applied to flat panel displays and new generation illumination.
An organic electroluminescent device (OLED) is a device prepared by depositing one or more layers of organic materials between a cathode and an anode by spin coating or vacuum evaporation. The organic electroluminescent device has the light emitting principle that when voltage is applied to the anode and the cathode, the two electrodes generate an electric field, under the action of the electric field, holes generated by the anode are combined with electrons generated by the cathode in the light emitting layer through the hole transport layer to form excitons, the excitons are in an excited state and release energy outwards, and the process of releasing energy from the excited state to a ground state releases energy and emits light outwards. Therefore, it is important to improve the recombination of electrons and holes in the OLED device.
OLED devices generally include an anode, a cathode, a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an emission layer (EML), an Electron Transport Layer (ETL), an Electron Injection Layer (EIL), a capping layer (CPL), and the like. Generally, the hole mobility of the hole transport material is often greater than the electron mobility of the electron transport material, so that the injection of holes and electrons is unbalanced, and the two cannot be effectively combined in the light emitting layer, resulting in a reduction in the light emitting efficiency of the organic light emitting device. In addition, when the OLED device is operated by applying voltage, Joule heat can be generated, so that organic materials are easy to crystallize, and the service life and the efficiency of the device are influenced. Due to the huge difference between the external quantum efficiency and the internal quantum efficiency of the OLED, the development of the OLED is greatly restricted.
Total reflection occurs at the interface between the ITO thin film and the glass substrate and the interface between the glass substrate and the air, the light emitted to the front external space of the OLED device accounts for about 20% of the total amount of the organic material thin film EL, and the remaining about 80% of the light is mainly confined in the organic material thin film, the ITO thin film and the glass substrate in the form of a waveguide. It can be seen that the light extraction efficiency of the conventional OLED device is low (about 20%), which severely restricts the development and application of the OLED. How to reduce the total reflection effect in the OLED device and improve the ratio of light coupled to the forward external space of the device (light extraction efficiency) has attracted much attention.
Therefore, how to combine and adjust various materials to make an organic electroluminescent device so that the organic electroluminescent device can achieve the effects of reducing voltage, improving efficiency and prolonging service life is a problem to be solved by those skilled in the art.
Disclosure of Invention
An object of the present invention is to provide an organic electroluminescent device, which is intended to improve device characteristics of the organic electroluminescent device, in particular, to greatly improve light emission efficiency of the device and to reduce driving voltage of the device.
In order to achieve the above object, the present invention provides an organic electroluminescent device, and deeply evaluates the characteristics of the organic electroluminescent device, solving the above problems. The organic electroluminescent device comprises a substrate, an anode, an organic layer and a cathode, wherein the organic layer comprises a hole transport layer and an electron transport layer, the hole transport layer contains a triamine compound represented by a formula I, the electron transport layer contains a heterocyclic compound represented by a formula II,
wherein, in formula I, X is selected from O or S;
the A ring, the B ring or the C ring is independently selected from a benzene ring, a naphthalene ring or no;
the R groups are the same or different from each other and are independently selected from one of methyl, ethyl, phenyl, tolyl, pentadeuterophenyl and naphthyl, or two adjacent R groups can be bonded to form a cyclic structure;
ar is1、Ar2、Ar3、Ar4Independently selected from one of substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl;
said L1、L2、L3、L4、L5、L6Independently selected from a single bond, substituted or unsubstituted arylene of C6-C30, substituted or unsubstituted heteroarylene of C3-C30;
the R is1、R2Independently selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl;
in the formula II, R is0The two R are same or different from each other and are independently selected from one of methyl, ethyl, phenyl, tolyl, pentadeuterated phenyl and naphthyl, or two adjacent R0The group can be bonded with the connected segment to form a spirofluorene cyclic structure;
said X1To X5Are the same or different from each other and are each independently N or C (R)w) And at least one is N, when C (R)w) When there are plural, plural C (R)w) Are identical to or different from each other, wherein RwOne selected from hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl;
Rx、Ry、Rzthe aryl group may be one or two groups, which may be the same or different from each other, independently selected from hydrogen, deuterium, a halogen group, a cyano group, a nitro group, an amino group, a substituted or unsubstituted C1-C15 alkyl group, a substituted or unsubstituted C3-C15 cycloalkyl group, a substituted or unsubstituted C6-C25 aryl group, and a substituted or unsubstituted C2-C20 heteroaryl group, or two adjacent groups may be bonded to form a cyclic structure; x is 0, 1,2, 3 or 4; y is 0, 1,2, 3 or 4; z is 0, 1,2, 3 or 4;
l is selected from one of single bond, substituted or unsubstituted arylene of C6-C30 and substituted or unsubstituted heteroarylene of C3-C30;
n is 0, 1,2 or 3.
The invention has the beneficial effects that:
the invention provides an organic electroluminescent device comprising a hole transport layer, an electron transport layer and optionally a capping layer. The triamine compound represented by the formula I is applied to the hole transport layer, the heterocyclic compound represented by the formula II is applied to the electron transport layer, and the triamine compound and the heterocyclic compound are matched and applied to the organic electroluminescent device, so that the transmission efficiency of holes and electrons in the device is improved, the holes and the electrons are effectively blocked in the light-emitting layer, the maximum combination of carriers is realized, the light-emitting efficiency of the organic electroluminescent device is improved, and the driving voltage of the device can be reduced; in addition, the triarylamine compound represented by the formula III is applied to the covering layer, so that the total reflection loss and waveguide loss in the OLED device are effectively reduced, the light extraction efficiency is improved, and the luminous efficiency of the organic electroluminescent device is better improved.
The organic electroluminescent device prepared by the invention greatly improves the device characteristics, effectively improves the luminous efficiency of the organic electroluminescent device, reduces the driving voltage of the device, and has good application effect and industrialization prospect.
Detailed Description
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of the present invention.
The alkyl group in the present invention refers to a hydrocarbon group obtained by dropping one hydrogen atom from an alkane molecule, and may be a straight-chain alkyl group or a branched-chain alkyl group, and preferably has 1 to 15 carbon atoms, more preferably 1 to 12 carbon atoms, and particularly preferably 1 to 6 carbon atoms. The straight chain alkyl group includes methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, undecyl, dodecyl and the like, but is not limited thereto; the branched alkyl group includes, but is not limited to, an isomeric group of isopropyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, an isomeric group of n-hexyl, an isomeric group of n-heptyl, an isomeric group of n-octyl, an isomeric group of n-nonyl, an isomeric group of n-decyl, and the like. The alkyl group is preferably a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, or a tert-butyl group.
The cycloalkyl group in the present invention refers to a hydrocarbon group obtained by removing one hydrogen atom from a cycloalkane molecule, and preferably has 3 to 15 carbon atoms, more preferably 3 to 12 carbon atoms, and particularly preferably 3 to 6 carbon atoms, and examples thereof may include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, bornyl, norbornyl, and the like. The alkyl group is preferably a cyclopentyl group, a cyclohexyl group, a 1-adamantyl group, a 2-adamantyl group or a norbornyl group.
The aryl group in the present invention refers to a general term of monovalent group remaining after one hydrogen atom is removed from an aromatic nucleus carbon of an aromatic compound molecule, and may be monocyclic aryl group, polycyclic aryl group or condensed ring aryl group, preferably having 6 to 25 carbon atoms, more preferably 6 to 20 carbon atoms, and particularly preferably 6 to 14 carbon atoms. The monocyclic aryl group means an aryl group having only one aromatic ring in the molecule, for example, phenyl group and the like, but is not limited thereto; the polycyclic aromatic group means an aromatic group having two or more independent aromatic rings in the molecule, for example, biphenyl group, terphenyl group and the like, but is not limited thereto; the fused ring aryl group refers to an aryl group in which two or more aromatic rings are contained in a molecule and are fused together by sharing two adjacent carbon atoms, and examples thereof include, but are not limited to, naphthyl, anthryl, phenanthryl, pyrenyl, perylenyl, fluorenyl, benzofluorenyl, triphenylene, fluoranthenyl, spirobifluorenyl, and the like. The above aryl group is preferably a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group (preferably a 2-naphthyl group), an anthryl group (preferably a 2-anthryl group), a phenanthryl group, a pyrenyl group, a perylenyl group, a fluorenyl group, a benzofluorenyl group, a triphenylene group, or a spirobifluorenyl group.
The heteroaryl group in the present invention refers to a general term of a group obtained by replacing one or more aromatic nucleus carbon atoms in an aryl group with a heteroatom, including but not limited to oxygen, sulfur, nitrogen or phosphorus atom, preferably having 1 to 25 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 3 to 15 carbon atoms, and most preferably 3 to 12 carbon atoms, wherein the linking site of the heteroaryl group may be located on a ring-forming carbon atom or a ring-forming nitrogen atom, and the heteroaryl group may be a monocyclic heteroaryl group, a polycyclic heteroaryl group or a fused ring heteroaryl group. The monocyclic heteroaryl group includes pyridyl, pyrimidyl, triazinyl, furyl, thienyl, pyrrolyl, imidazolyl and the like, but is not limited thereto; the polycyclic heteroaryl group includes bipyridyl, phenylpyridyl, and the like, but is not limited thereto; the fused ring heteroaryl group includes quinolyl, isoquinolyl, indolyl, benzothienyl, benzofuranyl, benzoxazolyl, benzimidazolyl, benzothiazolyl, dibenzofuranyl, dibenzothienyl, carbazolyl, benzocarbazolyl, acridinyl, 9, 10-dihydroacridinyl, phenoxazinyl, phenothiazinyl, phenoxathiyl and the like, but is not limited thereto. The heteroaryl group is preferably a pyridyl group, a pyrimidyl group, a thienyl group, a furyl group, a benzothienyl group, a benzofuryl group, a benzoxazolyl group, a benzimidazolyl group, a benzothiazolyl group, a dibenzofuryl group, a dibenzothienyl group, a dibenzofuryl group, a carbazolyl group, an acridinyl group, a phenoxazinyl group, a phenothiazinyl group or a phenoxathiyl group.
The arylene group of the present invention refers to the aromatic compound molecule which has two hydrogen atoms removed from the aromatic nucleus carbon and R is remainedxThe group, which may be a monocyclic arylene group, a polycyclic arylene group or a fused ring arylene group, has preferably 6 to 25 carbon atoms, more preferably 6 to 20 carbon atoms, and particularly preferably 6 to 14 carbon atoms. The monocyclic arylene group includes phenylene group and the like, but is not limited thereto; the polycyclic arylene group includes, but is not limited to, biphenylene, terphenylene, and the like; the condensed ring arylene group includes naphthylene, anthrylene, phenanthrylene, fluorenylene, pyrenylene, triphenylene, fluoranthenylene, phenylfluorenylene, and the like, but is not limited thereto. The arylene group is preferably a phenylene group, a biphenylene group, a terphenylene group, a naphthylene group, a fluorenylene group, or a phenylfluorenylene group.
Heteroarylene as used herein refers to the generic term for groups in which one or more of the aromatic core carbons in the arylene group is replaced with a heteroatom, including, but not limited to, oxygen, sulfur, nitrogen, or phosphorus atoms. Preferably 6 to 25 carbon atoms, more preferably 6 to 20 carbon atoms, particularly preferably 6 to 15 carbon atoms, and most preferably 3 to 12 carbon atoms, the linking site of the heteroarylene group may be located on a ring-forming carbon atom or on a ring-forming nitrogen atom, and the heteroarylene group may be a monocyclic heteroarylene group, a polycyclic heteroarylene group, or a fused ring heteroarylene group. The monocyclic heteroarylene group includes a pyridylene group, a pyrimidylene group, a triazinylene group, a furanylene group, a thiophenylene group and the like, but is not limited thereto; the polycyclic heteroarylene group includes bipyridyl idene, phenylpyridyl, etc., but is not limited thereto; the fused ring heteroarylene group includes, but is not limited to, a quinolylene group, an isoquinolylene group, an indolyl group, a benzothiophene group, a benzofuranylene group, a benzoxazolyl group, a benzimidazolylene group, a benzothiazolyl group, a dibenzofuranylene group, a dibenzothiophenylene group, a carbazolyl group, a benzocarbazolyl group, an acridinylene group, a 9, 10-dihydroacridine group, a phenoxazinyl group, a phenothiazinylene group, a phenoxathiin group and the like. The heteroaryl group is preferably a pyridylene group, pyrimidylene group, thienylene group, furylene group, benzothienylene group, benzofuranylene group, benzoxazolyl group, benzimidazolylene group, benzothiazolyl group, dibenzofuranylene group, dibenzothiophenylene group, dibenzofuranylene group, carbazolyl group, acridinylene group, phenoxazinyl group, phenothiazinylene group, phenoxathiin group.
In the present invention, when the position of a substituent on an aromatic ring is not fixed, it means that it can be attached to any of the corresponding optional positions of the aromatic ring. For example,can represent
The substituted alkyl, substituted cycloalkyl, substituted aryl, substituted heteroaryl, substituted arylene, substituted heteroarylene of the present invention are meant to be independently substitutedSelected from deuterium group, halogen, cyano, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C2-C20 heteroaryl, substituted or unsubstituted amine group and the like, but is not limited thereto, and is preferably mono-or polysubstituted with a group selected from deuterium, fluorine, chlorine, bromine, iodine, cyano, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, cyclopropyl, cyclopentyl, cyclohexyl, adamantyl, norbornyl, phenyl, tolyl, mesityl, penta-deuterated phenyl, biphenyl, terphenyl, naphthyl, anthryl, phenanthryl, benzophenanthryl, pyrenyl, benzyl, triphenylenyl and the like,Mono-or polysubstituted with groups such as, for example, a phenyl group, a perylene group, a fluoranthenyl group, a fluorenyl group, a 9, 9-dimethylfluorenyl group, a 9, 9-diphenylfluorenyl group, a 9-methyl-9-phenylfluorenyl group, a spirobifluorenyl group, a dianilino group, a dimethylamino group, a carbazolyl group, a 9-phenylcarbazolyl group, a carbazolonyl group, a pyrrolyl group, a furyl group, a thienyl group, a benzofuranyl group, a benzothienyl group, a dibenzofuranyl group, a dibenzothienyl group, a pyridyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, a triazinyl group, an oxazolyl group, a thiazolyl group, a benzoxazolyl group, a benzothiazolyl group, a benzotriazolyl group, a benzimidazolyl group, an indolyl group, a quinolyl group, an isoquinolyl group, a phenothiazinyl group, a phenoxazinyl group, an acridinyl group.
The bonding to form a cyclic structure according to the present invention means that the two groups are linked to each other by a chemical bond and optionally aromatized. As exemplified below:
in the present invention, the ring formed by the connection may be a five-membered ring or a six-membered ring or a fused ring, such as benzene, naphthalene, fluorene, cyclopentene, cyclopentane, cyclohexane-acene, quinoline, isoquinoline, dibenzothiophene, phenanthrene or pyrene, but not limited thereto.
The invention provides an organic electroluminescent device which comprises a substrate, an anode, an organic layer and a cathode, wherein the organic layer comprises a hole transport layer and an electron transport layer. Optionally, the organic electroluminescent device of the present invention further comprises a capping layer. The organic layer of the organic electroluminescent device of the present invention may be formed of a single layer structure or a multilayer structure in which the above organic layers are stacked; meanwhile, each of the organic layers may further include one or more layers, for example, the hole transport layer may include a first hole transport layer, a second hole transport layer, a third hole transport layer, and the like, and the electron transport layer may include a first electron transport layer, a second electron transport layer, and the like. Corresponding functional layers may be added or subtracted as desired.
The organic electroluminescent device of the present invention preferably has the following structure:
(1) anode/hole transport layer/light emitting layer/electron transport layer/cathode/capping layer;
(2) anode/hole transport layer/light emitting layer/electron transport layer/electron injection layer/cathode/capping layer;
(3) anode/hole transport layer/light emitting layer/hole blocking layer/electron transport layer/electron injection layer/cathode/capping layer;
(4) anode/hole transport layer/electron blocking layer/light emitting layer/hole blocking layer/electron transport layer/electron injection layer/cathode/capping layer;
(5) anode/hole transport layer/electron blocking layer/light emitting layer/hole blocking layer/electron transport layer/cathode/capping layer;
(6) anode/hole injection layer/hole transport layer/light emitting layer/electron transport layer/cathode/capping layer;
(7) anode/hole injection layer/hole transport layer/light emitting layer/hole blocking layer/electron transport layer/cathode/capping layer;
(8) anode/hole injection layer/hole transport layer/light emitting layer/electron transport layer/electron injection layer/cathode/capping layer;
(9) anode/hole injection layer/hole transport layer/light emitting layer/hole blocking layer/electron transport layer/electron injection layer/cathode/capping layer;
(10) anode/hole transport layer/electron blocking layer/light emitting layer/electron transport layer/cathode/capping layer;
(11) anode/hole injection layer/hole transport layer/electron blocking layer/light emitting layer/electron transport layer/cathode/capping layer;
(12) anode/hole transport layer/electron blocking layer/light emitting layer/electron transport layer/electron injection layer/cathode/capping layer;
(13) anode/hole injection layer/hole transport layer/electron blocking layer/light emitting layer/electron transport layer/electron injection layer/cathode/capping layer;
(14) anode/hole injection layer/hole transport layer/electron blocking layer/light emitting layer/hole blocking layer/electron transport layer/cathode/capping layer;
(15) anode/hole transport layer/light emitting layer/hole blocking layer/electron transport layer/cathode/capping layer;
(16) anode/hole injection layer/hole transport layer/electron blocking layer/light emitting layer/hole blocking layer/electron transport layer/electron injection layer/cathode/capping layer.
However, the structure of the organic electroluminescent device is not limited thereto. The organic electroluminescent device can be selected and combined according to the parameter requirements of the device and the characteristics of materials, and part of organic layers can be added or omitted. For example, a hole buffer layer may be added between the hole transport layer and the hole injection layer, an electron buffer layer may be added between the electron transport layer and the electron injection layer, or an organic layer having the same function may be formed in a stacked structure of two or more layers.
The organic electroluminescent device of the present invention is generally formed on a substrate. A substrate may be used under the anode or over the cathode. The substrate is a glass or polymer material having excellent mechanical strength, thermal stability, water resistance, and transparency. The substrate may be any substrate as long as it does not change when forming an electrode or an organic layer, for example, a substrate of glass, plastic, a polymer film, silicon, or the like. When the substrate is opaque, the electrode opposite thereto is preferably transparent or translucent.
In the organic electroluminescent device of the present invention, the anode material may be selected from metals, such as aluminum, copper, gold, silver, and the like,Iron, chromium, nickel, manganese, palladium, platinum, and the like, and alloys thereof; examples of the metal oxide include indium oxide, zinc oxide, Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and tin dioxide (SnO)2) Aluminum zinc oxide, and the like; examples of the conductive polymer include polyaniline, polypyrrole, and poly (3-methylthiophene). In addition to the above materials and combinations thereof, the anode material may also include other known materials suitable for use as an anode.
In the organic electroluminescent device according to the present invention, the hole injection material may be a metal oxide such as molybdenum oxide, silver oxide, vanadium oxide, tungsten oxide, ruthenium oxide, nickel oxide, copper oxide, or titanium oxide, or a low molecular weight organic compound such as a phthalocyanine-based compound or a polycyano group-containing conjugated organic material, but is not limited thereto. The hole injection layer may be a single compound material or a combination of a plurality of compounds. For example, the hole injection layer may employ one or more compounds of H1 to H17 described below, or employ one or more compounds of P1 to P12; one or more compounds of H1-H17 can be also used for doping one or more compounds of the following P1-P12, preferably, the mode that one or more compounds of H1-H17 are used for doping one or more compounds of the following P1-P12 in the hole injection layer of the invention is adopted, and the host material is selected from one of the following compounds:
preferably, the doping material is selected from one of the following compounds represented by P1-P12:
in the organic electroluminescent device of the present invention, the hole transport layer material may be selected from small molecular materials such as aromatic amine derivatives, carbazole derivatives, stilbene derivatives, triphenyldiamine derivatives, styrene compounds, butadiene compounds, and the like, and polymer materials such as poly-p-phenylene derivatives, polyaniline and its derivatives, polythiophene and its derivatives, polyvinylcarbazole and its derivatives, polysilane and its derivatives, but is not limited thereto. Preferably, the hole transport layer material of the present invention is selected from one or more mixtures of triamine compounds represented by the following formula i:
x is selected from O or S;
the A ring, the B ring or the C ring is independently selected from a benzene ring, a naphthalene ring or no;
the R groups are the same or different from each other and are independently selected from one of methyl, ethyl, phenyl, tolyl, pentadeuterophenyl and naphthyl, or two adjacent R groups can be bonded to form a cyclic structure;
ar is1、Ar2、Ar3、Ar4Independently selected from one of substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl;
said L1、L2、L3、L4、L5、L6Independently selected from a single bond, substituted or unsubstituted arylene of C6-C30, substituted or unsubstituted heteroarylene of C3-C30;
the R is1、R2Independently selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl.
Preferably, Ar is1、Ar2、Ar3、Ar4Independently selected from one of the following substituents:
the R is11Selected from deuterium, methyl, ethyl,One of n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl, cyclohexyl, adamantyl, norbornyl, phenyl, pentadeuterated phenyl, deuterated naphthyl, tolyl, biphenyl, terphenyl, naphthyl, anthryl, phenanthryl, triphenylene, acridinyl, spirobifluorenyl, 9-dimethylfluorenyl, 9-diphenylfluorenyl, 9-phenylcarbazolyl and pyrenyl;
h is 0, 1,2, 3 or 4; i is 0, 1,2, 3, 4 or 5; j is 0, 1,2, 3, 4, 5, 6 or 7; k is 0, 1,2, 3, 4, 5, 6, 7, 8 or 9.
Preferably, Ar is1、Ar2One selected from the following substituents:
more preferably, Ar1、Ar2One selected from the following substituents:
preferably, Ar is3、Ar4One selected from the following substituents:
preferably, said L1、L2、L3、L4、L5、L6Independently selected from one of a single bond, substituted or unsubstituted phenylene, substituted or unsubstituted naphthylene and substituted or unsubstituted fluorenylene, wherein the substituent of the substituted or unsubstituted phenylene, substituted or unsubstituted naphthylene and substituted or unsubstituted fluorenylene is one or more of deuterium, methyl, ethyl, isopropyl, tertiary butyl, phenyl, biphenyl and pentadeuterated phenyl.
More preferably, said L1、L2、L3、L4、L5、L6Independently selected from a single bond or one of the following substituents:
preferably, said R is1、R2Independently selected from one of hydrogen, deuterium, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl, cyclohexyl, adamantyl, norbornyl, phenyl, pentadeuterated phenyl, deuterated naphthyl, tolyl, biphenyl, terphenyl, naphthyl, anthryl, phenanthryl, triphenylene, acridinyl, spirobifluorenyl, 9-dimethylfluorenyl, 9-diphenylfluorenyl and 9-phenylcarbazolyl.
Most preferably, the triamine compound represented by the formula I is selected from any one of the following compounds:
in the organic electroluminescent device according to the present invention, the light-emitting layer material includes a light-emitting layer host material AND a light-emitting layer guest material, the light-emitting layer host material may be selected from 4,4 '-bis (9-Carbazole) Biphenyl (CBP), 9, 10-bis (2-naphthyl) Anthracene (ADN), 4-bis (9-carbazolyl) biphenyl (CPB), 9' - (1, 3-phenyl) bis-9H-carbazole (mCP), 4',4 "-tris (carbazol-9-yl) triphenylamine (TCTA), 9, 10-bis (1-naphthyl) anthracene (α -AND), N' -bis- (1-naphthyl) -N, N '-diphenyl- [1,1':4',1 ″: 4", 1' "-tetrabiphenyl ] -4, 4' -diamino (4PNPB), 1,3, 5-tris (9-carbazolyl) benzene (TCP), and the like. In addition to the above materials and combinations thereof, the light-emitting layer host material may also include other known materials suitable for use as a light-emitting layer, such as red light-emitting layer host materials represented by RH-1 to RH-12 below:
the light-emitting layer guest can be selected from 9, 10-di [ N- (p-tolyl) anilino]Anthracene (TPA), 4- (dicyanomethylene) -2-methyl-6- (4-dimethylaminostyryl) -4H-pyran (DCM), tris [ 1-phenylisoquinoline-C2, N]Iridium (III) (Ir (piq)3) Bis (1-phenylisoquinoline) (acetylacetonato) iridium (Ir (piq))2(acac)) and the like. In addition to the above materials, the light-emitting layer guest material may include other known materials suitable for use as a light-emitting layer, such as red light-emitting layer guest materials as represented by RD-1 to RD-12 below:
the doping ratio of the host material and the guest material of the light-emitting layer may be preferably varied depending on the materials used, and the mass percentage of the guest material of the light-emitting layer is usually 0.01 to 20%, preferably 0.1 to 15%, and more preferably 1 to 10%.
In the organic electroluminescent device of the present invention, the electron transport material may be selected from 2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline (BCP), 1,3, 5-tris (N-phenyl-2-benzimidazole) benzene (TPBi), tris (8-hydroxyquinoline) aluminum (III) (Alq)3) 8-hydroxyquinoline-lithium (Liq), bis (2-methyl-8-hydroxyquinoline) (4-phenylphenol) aluminum (III) (BAlq), 3- (biphenyl-4-yl) -5- (4-tert-butylphenyl) -4-phenyl-4H-1, 2, 4-Triazole (TAZ), 4, 7-diphenyl-1, 10-phenanthroline (Bphen), and the like, and the electron transport material may include other known materials suitable for an electron transport layer in addition to the above materials and combinations thereof. Preferably, the electron transport layer of the present invention and one or more mixtures containing heterocyclic compounds represented by the following formula II,
wherein, R is0The two R are same or different from each other and are independently selected from one of methyl, ethyl, phenyl, tolyl, pentadeuterated phenyl and naphthyl, or two adjacent R0The group can be bonded with the connected segment to form a spirofluorene cyclic structure;
said X1To X5Are the same or different from each other and are each independently N or C (R)w) And at least one is N, when C (R)w) When there are plural, plural C (R)w) Are identical to or different from each other, wherein RwOne selected from hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl;
Rx、Ry、Rzthe aryl group may be one or two groups, which may be the same or different from each other, independently selected from hydrogen, deuterium, a halogen group, a cyano group, a nitro group, an amino group, a substituted or unsubstituted C1-C15 alkyl group, a substituted or unsubstituted C3-C15 cycloalkyl group, a substituted or unsubstituted C6-C25 aryl group, and a substituted or unsubstituted C2-C20 heteroaryl group, or two adjacent groups may be bonded to form a cyclic structure; x is 0, 1,2, 3 or 4; y is 0, 1,2, 3 or 4; z is 0, 1,2, 3 or 4;
l is selected from one of single bond, substituted or unsubstituted arylene of C6-C30 and substituted or unsubstituted heteroarylene of C3-C30;
n is 0, 1,2 or 3.
z is1Is 0, 1,2 or 3; z is a radical of2Is 0, 1 or 2.
Preferably, said R isx、Ry、RzIdentical to or different from each other, each independently selected from hydrogen, deuterium, a halogen group, cyano, nitro, amino, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl or from one of the structures shown below,
preferably, said R isySelected from hydrogen, deuterium, a halogen group, cyano, nitro, amino, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl, cyclohexyl, adamantyl, norbornyl or one of the structures shown below,
preferably, Rw is selected from one of hydrogen, deuterium, cyclohexyl, adamantyl, norbornyl, phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, anthracenyl, fluorenyl, dibenzofluorenyl, spirobifluorenyl, benzospirobifluorenyl, pyridyl, pyrimidyl, pyridazinyl, triazinyl, quinolyl, isoquinolyl, quinoxalinyl, quinazolinyl, phenanthroline, dibenzofuranyl, dibenzothienyl, and carbazolyl.
Preferably, L is selected from the group consisting of a single bond, a substituted or unsubstituted cyclohexylene group, a substituted or unsubstituted adamantylene group, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted terphenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted phenanthrylene group, a substituted or unsubstituted anthrylene group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenylene group, a substituted or unsubstituted benzofluorenylene group, a substituted or unsubstituted dibenzofluorenylene group, a substituted or unsubstituted spirobifluorenylene group, a substituted or unsubstituted pyridinylene group, a substituted or unsubstituted pyrimidinylene group, a substituted or unsubstituted pyridazinyl group, a substituted or unsubstituted triazinylene group, a substituted or unsubstituted quinolylene group, a substituted or unsubstituted isoquinolinylene group, Substituted or unsubstituted quinoxalinylene, substituted or unsubstituted quinazolinylene, substituted or unsubstituted phenanthroline, substituted or unsubstituted azaanthracylene, substituted or unsubstituted dibenzofuranylene, substituted or unsubstituted dibenzothiophenylene, or substituted or unsubstituted carbazolyl.
Most preferably, the heterocyclic compound represented by the formula II is selected from any one of the following compounds:
in the organic electroluminescent device according to the present invention, the electron injection material may Be selected from Li, Na, K, Rb, Cs, Be, Mg, Ca, lithium fluoride (LiF), sodium fluoride, potassium fluoride, rubidium fluoride, cesium fluoride, magnesium fluoride, calcium fluoride, lithium oxide, cesium carbonate, potassium silicate, lithium acetate, lithium tetrakis (8-hydroxyquinoline) boron, 8-hydroxyquinoline-lithium (Liq), and the like, and in addition to the above materials and combinations thereof, the electron injection material may include other known materials suitable for an electron injection layer. Preferably, the electron injection layer according to the present invention is selected from lithium fluoride (LiF), 8-hydroxyquinoline-lithium (Liq), and the like.
In the cathode material, a metal material having a small work function is generally preferable in order to inject electrons into the electron injection/transport layer or the light-emitting layer. For example, metals such as lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, aluminum, scandium, vanadium, zinc, yttrium, indium, cerium, samarium, europium, terbium, ytterbium, and the like, alloys of 2 or more of these metals, or alloys of 1 or more of these metals and 1 or more of gold, silver, platinum, copper, manganese, titanium, cobalt, nickel, tungsten, tin, graphite, or graphite intercalation compounds, and the like can be used. Examples of the alloy include magnesium-silver alloy, magnesium-indium alloy, magnesium-aluminum alloy, indium-silver alloy, lithium-aluminum alloy, lithium-magnesium alloy, lithium-indium alloy, and calcium-aluminum alloy. The cathode may have a laminated structure of 2 or more layers. In addition to the above materials and combinations thereof, the cathode material may also include other known materials suitable for use as a cathode.
Among them, when light emission of the light-emitting layer is extracted from the cathode, the light transmittance of the cathode is preferably more than 10%. It is also preferable that the sheet resistivity of the cathode is several hundred Ω/□ or less, and the film thickness is usually 10nm to 500nm, preferably 10nm to 100 nm.
In the organic electroluminescent device, the covering layer contains the triarylamine compound shown in the formula III, and the triarylamine compound can be independently formed into a film or can be mixed with other materials to form a film,
said XaSelected from O or S;
ar isa、ArbIndependently selected from one of substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl, with the proviso that AraOr ArbAt least one of them is a condensed ring group;
said La、Lb、LcIndependently selected from single bond, substituted or unsubstituted arylene of C6-C30, and substituted or unsubstituted heteroarylene of C3-C30One of (1);
the R isa、RbIndependently selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl.
Preferably, Ar isaAnd (b) one selected from substituted or unsubstituted naphthyl, substituted or unsubstituted anthryl, substituted or unsubstituted phenanthryl, substituted or unsubstituted triphenylene, substituted or unsubstituted pyrenyl, substituted or unsubstituted chrysenyl and substituted or unsubstituted perylene.
Preferably, Ar isaOne selected from the following substituents:
the R is31One selected from deuterium, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl, cyclohexyl, adamantyl, norbornyl, phenyl, pentadeuterated phenyl, deuterated naphthyl, tolyl, biphenyl, terphenyl, naphthyl, anthryl and phenanthryl;
a is 0, 1,2, 3 or 4; b is 0, 1,2, 3, 4, 5, 6 or 7; c is 0, 1,2, 3, 4, 5, 6, 7, 8 or 9; d is 0, 1,2, 3, 4, 5, 6, 7, 8, 9,10 or 11.
More preferably, Ar isaOne selected from the following substituents:
wherein Ad is adamantyl or norbornyl.
Preferably, Ar isbOne selected from the following substituents:
wherein Ad is adamantyl or norbornyl.
Preferably, said La、Lb、LcIndependently selected from a single bond or one of the bridging groups shown below:
more preferably, said La、Lb、LcIndependently selected from a single bond or one of the following groups:
preferably, said R isa、RbIndependently selected from one of hydrogen, deuterium, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl, cyclohexyl, adamantyl, norbornyl, phenyl, tolyl, biphenyl, terphenyl, naphthyl, anthryl, phenanthryl, triphenylene and pyrenyl.
Most preferably, the triarylamine compound represented by formula iii is selected from any one of the following compounds:
preferably, the refractive index range of the covering layer is 1.8-2.5, and the thickness of the covering layer is 40-80 nm.
More preferably, the refractive index of the covering layer ranges from 1.9 to 2.3, and the thickness of the covering layer ranges from 55nm to 70 nm.
The organic layer of the organic electroluminescent device of the present invention has a film thickness selected from the range of 0.5nm to 500nm, preferably 1nm to 300nm, and more preferably 1nm to 120 nm. The film thickness of the organic layer is appropriately changed depending on the kind of material used in the organic electroluminescent device and the thickness of the other layer.
The optimum film thicknesses of the hole transporting layer and the electron transporting layer may vary depending on the materials used, and may be selected so as to achieve appropriate values of the driving voltage and the light emission efficiency. Therefore, the thickness of the electron transport layer is, for example, 1nm to 1um, preferably 2nm to 500nm, and more preferably 5nm to 200 nm.
In the organic electroluminescent device of the present invention, at least one of the anode and the cathode is transparent or translucent, and preferably, the anode side is transparent or translucent.
The order and number of layers of the organic electroluminescent element and the thickness of each layer may be appropriately selected in consideration of the luminous efficiency and the lifetime of the element. The method for forming each layer in the organic electroluminescent device is not particularly limited, and any one of vacuum evaporation, spin coating, vapor deposition, blade coating, laser thermal transfer, electrospray coating, slit coating, and dip coating may be used, and in the present invention, vacuum evaporation is preferably used.
The organic electroluminescent device can be widely applied to the fields of panel display, lighting sources, flexible OLEDs, electronic paper, organic solar cells, organic photoreceptors or organic thin film transistors, signs, signal lamps and the like.
The triamine compound represented by the formula I, the heterocyclic compound represented by the formula II and the triarylamine compound represented by the formula III can be obtained by the following methods:
formula I is a reaction formula:
bromo-compound A-1 and arylamine compound B-1 are coupled and reacted through Buchwald-Hartwig to obtain intermediate C-1, and intermediate C-2 and intermediate C-3 are obtained in the same way; carrying out Buchwald-Hartwig coupling reaction on the compound D and the intermediate C-1 to obtain an intermediate E; the intermediate E and the intermediate C-2 obtain an intermediate F; and carrying out Buchwald-Hartwig coupling reaction on the intermediate F and the intermediate C-3 to finally obtain the target compound shown in the formula I.
The formula II is shown as the following reaction formula:
formula ii the formula ii can be prepared by coupling a halogen substituted heterocyclic compound with an aromatic compound substituted with a boronic acid or boronic acid derivative using a palladium catalysed reaction, the preparation being obtainable by a carbon coupling reaction and a Miyaura boronation reaction.
The Xn is selected from one of F, Cl, Br and I, and each Xn is the same or different; conventional methods well known to those skilled in the art may be employed. For example, carbon-carbon coupling reactions, Miyaura boronation reactions, and the like.
Formula III reaction formula:
performing Buchwald-Hartwig coupling reaction on the bromo-compound A ' and the arylamine compound B ' to obtain an intermediate D '; and (3) carrying out Buchwald-Hartwig coupling reaction on the intermediate D 'and the compound C', and finally obtaining the target compound shown in the formula III.
The sources of the raw materials used in the above-mentioned reactions are not particularly limited, and the triamine compounds represented by formula I, the heterocyclic compounds represented by formula II, and the triarylamine compounds represented by formula III according to the present invention can be obtained by using commercially available raw materials or by using preparation methods known to those skilled in the art. The present invention is not particularly limited to the above-mentioned reaction, and a conventional reaction known to those skilled in the art may be used.
The invention is explained in more detail by the following examples, without wishing to restrict the invention accordingly. Based on this description, one of ordinary skill in the art will be able to practice the invention and prepare other compounds and devices according to the invention within the full scope of the disclosure without undue inventive effort.
Description of raw materials, reagents and characterization equipment:
the raw materials used in the following examples are not particularly limited, and may be commercially available products or prepared by methods known to those skilled in the art.
The mass spectra were obtained using a UK Watts G2-Si quadrupole tandem time-of-flight high resolution mass spectrometer.
The elemental analysis was carried out by using a Vario EL cube type organic element analyzer of Elementar, Germany, and the sample mass was 5 to 10 mg.
Synthesis example 1: preparation of Compound 1-1
Synthesis of intermediate C-1
Compound A-1(22.40g,82mmol), B-1(7.64g,82mmol) and sodium tert-butoxide (14.13g,147mmol) were dissolved in 300ml of degassed toluene under argon, palladium acetate (0.64g,2.87mmol) and triphenylphosphine (0.75g,2.87mmol) were added with stirring, and the mixture of the above reactants was heated under reflux for 7 h. After the reaction is finished, cooling the reaction mixture to room temperature, adding 90ml of deionized water for washing, stirring, standing for liquid separation, repeating the operation for three times, concentrating the organic layer under reduced pressure to one third of the volume of the system, stirring for crystallization, filtering by a Buchner funnel, leaching by toluene, and purifying by silica gel column chromatography by using petroleum ether and dichloromethane of which the ratio is 3:1 as a mobile phase to obtain an intermediate C-1(19.89g and 85%), wherein the solid purity is not less than 99.7% by HPLC (high performance liquid chromatography). Mass spectrum m/z: 285.1528 (theoretical value: 285.1517).
Synthesis of Compound 1-1
Intermediate C-2(16.85g,65mmol), D-1(14.68g,65mmol) and sodium tert-butoxide (11.24g,117mmol) were dissolved in 250ml of dehydrated toluene under argon and Pd (dba) was added with stirring2(1.31g,2.28mmol),P(t-Bu)3(0.46g,2.28mmol), and the mixed solution of the above reactants was heated under reflux for 8 h. After the reaction is finished, cooling the reaction mixture to room temperature, adding 75ml of deionized water for washing, stirring, standing for liquid separation, repeating the operation for three times, concentrating the organic layer under reduced pressure to one third of the volume of the system, stirring for crystallization, filtering, eluting with toluene, and purifying by silica gel column chromatography with ethyl acetate, dichloromethane and mobile phase of 1:5 to obtain an intermediate E-1(22.60g, 86%), wherein the solid purity is not less than 99.4% by HPLC (high performance liquid chromatography). Mass spectrum m/z: 403.0542 (theoretical value: 403.0531).
Intermediate E-1(20.21g,50mmol), C-1(14.23g,50mmol) and sodium tert-butoxide (8.65g,90mmol) were dissolved in 200ml of dehydrated toluene under argon, and Pd was added thereto with stirring2(dba)3(1.60g,1.75mmol), X-phos (0.83g,1.75mmol), and the mixed solution of the above reactants was heated under reflux for 8 h. After the reaction is finished, cooling to room temperature, adding 70ml of deionized water, stirring, washing, standing, separating liquid, repeating the operation for three times, concentrating the organic phase under reduced pressure to one third of the volume of the system, stirring and crystallizingFiltering, eluting with toluene, purifying by silica gel column chromatography with dichloromethane and n-heptane 1:3 as mobile phase, and then recrystallizing with toluene to obtain compound 1-1(37.89g, 84%), with solid purity ≧ 99.8% by HPLC. Mass spectrum m/z: 901.4078 (theoretical value: 901.4032). Theoretical element content (%) C66H51N3O: c, 87.87; h, 5.70; and N, 4.66. Measured elemental content (%): c, 87.82; h, 5.68; and N, 4.63.
Intermediates C-3 to C-6, C-9 to C-15, C-17 and C-18 can be prepared according to the preparation method of the intermediate C-1 in synthetic example 1 by correspondingly replacing the raw materials and the intermediates, and the yield is shown in the following table:
synthesis example 2: preparation of Compounds 1-15
By replacing C-2 in Synthesis example 1 with an equimolar amount of C-7 and replacing C-1 with an equimolar amount of C-8, and by following the same procedure, Compound 1-15(48.04g, 85%) was obtained, which had a solid purity of 99.3% or more by HPLC. Mass spectrum m/z: 1129.4923 (theoretical value: 1129.4971). Theoretical element content (%) C78H57N3O: c, 89.03; h, 5.46; and N, 3.99. Measured elemental content (%): c, 89.07; h, 5.45; and N, 3.94.
Synthetic example 3: preparation of Compounds 1-49
The C-2 in Synthesis example 1 was replaced with equimolar C-3, C-1The same procedure was repeated except for the formation of equimolar C-4 to give compounds 1-49(43.15g, 82%) having a purity of > 99.5% by HPLC. Mass spectrum m/z: 1051.4547 (theoretical value: 1051.4502). Theoretical element content (%) C78H57N3O: c, 89.03; h, 5.46; and N, 3.99. Measured elemental content (%): c, 89.07; h, 5.45; and N, 3.94.
Synthetic example 4: preparation of Compounds 1-95
By replacing C-2 in Synthesis example 1 with an equimolar amount of C-11 and replacing C-1 with an equimolar amount of C-12, and by following the same procedure, Compound 1-95(53.79g, 84%) was obtained, which had a solid purity of 99.5% or more by HPLC. Mass spectrum m/z: 1280.5423 (theoretical value: 1280.5474). Theoretical element content (%) C96H69N3O: c, 90.04; h, 5.43; and N, 3.28. Measured elemental content (%): c, 90.07; h, 5.40; and N, 3.24.
Synthesis example 5: preparation of Compounds 1-216
Synthesis example 1 was repeated in the same manner except for replacing C-2 with equimolar C-15 to give compounds 1 to 216(40.47g, 85%) having a solid purity of 99.8% by HPLC. Mass spectrum m/z: 951.4175 (theoretical value: 951.4189). Theoretical element content (%) C70H53N3O: c, 88.30; h, 5.61; n, 4.41. Measured elemental content (%): c, 88.25; h, 5.64; n, 4.44.
Synthetic example 6: preparation of Compounds 1-265
Compound C-1(19.98g,70mmol), D-2(22.21g,70mmol) and sodium tert-butoxide (12.11g,126mmol) were dissolved in 250ml of degassed toluene under argon, palladium acetate (0.55g,2.45mmol) and triphenylphosphine (0.64g,2.45mmol) were added with stirring, and the mixture of the above reactants was heated under reflux for 7 h. After the reaction is finished, cooling to room temperature, cooling the reaction mixture to room temperature, adding 70ml of deionized water for washing, stirring, repeating the operation for three times, concentrating the organic layer under reduced pressure to one third of the volume of the system, stirring for crystallization, filtering, leaching with toluene, recrystallizing with toluene to obtain an intermediate E-8(27.59g, 83%), and detecting the solid purity by HPLC (high performance liquid chromatography) to be not less than 99.8%. Mass spectrum m/z: 473.0559 (theoretical value: 473.0546).
Intermediate E-8(21.37g,45mmol), C-16(11.04g,45mmol) and sodium tert-butoxide (7.78g,81mmol) were dissolved in 200ml of dehydrated toluene under argon, and Pd (dba) was added with stirring2(0.90g,1.57mmol),P(t-Bu)3(0.32g,1.57mmol), and the mixed solution of the above reactants was heated under reflux for 8 hours. After the reaction is finished, cooling the reaction mixture to room temperature, adding 65ml of deionized water for washing, stirring, standing, repeating the operation for three times, concentrating the organic layer under reduced pressure to one third of the volume of the system, stirring for crystallization, filtering, leaching with toluene, and purifying by silica gel column chromatography with petroleum ether and dichloromethane (1:3) to obtain an intermediate F-1(24.74g, 86%), wherein the solid purity is not less than 99.6% by HPLC (high performance liquid chromatography). Mass spectrum m/z: 657.2495 (theoretical value: 657.2478).
Intermediate F-1(22.37g,35mmol), C-17(10.82g,35mmol) and sodium tert-butoxide (6.05g,63mmol) were dissolved in 250ml of dehydrated toluene under argon, and Pd was added thereto with stirring2(dba)3(1.13g,1.23mmol), X-Phos (0.59g,1.23mmol), and the mixed solution of the above reactants was heated under reflux for 8 h. After the reaction is finished, cooling the mixture to room temperature, adding 80ml of deionized water, stirring, washing, standing, separating liquid, repeating the operation for three times, concentrating the organic layer under reduced pressure to one third of the volume of the system, stirring, crystallizing, filtering, leaching with toluene, recrystallizing and purifying the crude product with toluene to obtain the compounds 1-265(26.82g, 84%), and the purity of the solid is not less than 99.6% by HPLC (high performance liquid chromatography). Mass spectrum m/z: 911.3821 (theoretical value: 911.3876). Theoretical element content (%) C67H49N3O: c, 88.22; h, 5.41; and N, 4.61. Measured elemental content (%): c, 88.18; h, 5.45; n, 4.62.
Synthetic example 7: preparation of Compounds 1-268
By replacing C-2 in Synthesis example 1 with an equimolar amount of C-6 and replacing C-1 with an equimolar amount of C-5, and by following the same procedure, Compound 1-268(37.15g, 81%) was obtained, which had a solid purity of 99.7% or more by HPLC. Mass spectrum m/z: 916.4923 (theoretical value: 916.4974). Theoretical element content (%) C66H36D15N3O: c, 86.42; h, 7.25; n, 4.58. Measured elemental content (%): c, 86.45; h, 7.28; n, 4.53.
Synthesis example 8: preparation of Compounds 1-281
By replacing C-2 in Synthesis example 1 with an equimolar amount of C-10 and replacing C-1 with an equimolar amount of C-9, and by following the same procedure, Compounds 1-281(54.15g, 83%) were obtained, and the purity of the solid was 99.4% or more by HPLC. Mass spectrum m/z: 1304.7312 (theoretical value: 1304.7352). Theoretical element content (%) C96H93N3O: c, 88.37; h, 7.18; and N, 3.22. Measured elemental content (%): c, 88.32; h, 7.22; and N, 3.20.
Synthetic example 9: preparation of Compounds 1-308
By replacing C-1 in Synthesis example 1 with equimolar C-13 and carrying out the same procedures, Compound 1-308(42.14g, 80%) was obtained with a solid purity ≧ 99.7% by HPLC. Mass spectrum m/z: 1053.4671 (theoretical value: 1053.4658). Theoretical element content (%) C78H59N3O: c, 88.86; h, 5.64; and N, 3.99. Measured elemental content (%): c, 88.87; h, 5.67; and N, 3.94.
Synthetic example 10: preparation of Compounds 1-313
Synthesis example 1 was repeated in the same manner except for replacing C-1 with equimolar C-14 to give compound 1-313(41.09g, 82%) having a solid purity of 99.5% by HPLC. Mass spectrum m/z: 1001.4321 (theoretical value: 1001.4345). Theoretical element content (%) C74H55N3O: c, 88.68; h, 5.53; n, 4.19. Measured elemental content (%): c, 88.65; h, 5.58; and N, 4.15.
Synthetic example 11: preparation of Compounds 1-322
Compound 1-322(45.44g, 79%) was obtained by replacing C-1 in Synthesis example 1 with equimolar C-18 and carrying out the same procedure, and the purity of the solid was ≧ 99.5% by HPLC. Mass spectrum m/z: 1149.4672 (theoretical value: 1149.4658). Theoretical element content (%) C86H59N3O: c, 89.79; h, 5.17; and N, 3.65. Measured elemental content (%): c, 89.74; h, 5.12; and N, 3.61.
Synthetic example 12: synthesis of Compound 1
Synthesis of intermediate A-1
600mL of tetrahydrofuran solvent, the raw material a-1(16.39g, 60mmol), the raw material b-1(13.95g, 60mmol), and pd (dppf) Cl were added to a three-necked flask in this order under nitrogen protection2(0.44g, 0.6mmol) and potassium acetate (7.07g, 72mmol), the mixture was stirred and the reaction was heated under reflux at 80 ℃ for 5 hours under nitrogen. After the reaction had ended, the mixture was cooled and 80mL of distilled water were added, filtered through Celite, the filtrate was concentrated, recrystallized from toluene, filtered off with suction and rinsed with toluene to give a recrystallized solid, c-1 (C-1)18.05g, yield 79%). Mass spectrum m/z: 380.1345 (theoretical value: 380.1332).
400mL of tetrahydrofuran solvent, c-1(15.24g, 40mmol), the starting material d-1(10.16g, 40mmol), pd (dppf) Cl were added to a three-necked flask in this order under nitrogen protection2(0.29g, 0.4mmol) and cesium carbonate (16.94g, 52mmol), stirring the mixture, and heating at 100 ℃ under nitrogen for reflux for 7 hours; after the reaction had ceased, the mixture was cooled and 60mL of distilled water was added, filtered over celite, the filtrate was concentrated, recrystallized from toluene, filtered off with suction and rinsed with toluene to give a recrystallized solid, yielding intermediate A-1(14.36g, 76% yield). Mass spectrum m/z: 472.2583 (theoretical value: 472.2574).
Synthesis of Compound 1
To a three-necked flask, 250mL of a 1, 4-dioxane solvent, intermediate A-1(14.17g, 30mmol), starting material e-1(8.03g, 30mmol), and pd were added in this order under a nitrogen blanket2(dba)3(0.27g, 0.3mmol) and 50% tri-tert-butylphosphine (0.2mL, 0.4mmol), potassium carbonate (4.55g, 33mmol), stirring the mixture, refluxing under nitrogen for 10 hours, after completion of the reaction, cooling naturally, filtering, washing the cake with 60mL of deionized water, repeating the operation three times with cyclohexane: separating, purifying and refining ethyl acetate 10:1 by column chromatography as eluent to obtain compound 1(12.48g, yield 72%) with HPLC purity not less than 99.2%.
Mass spectrum m/z: 577.2523 (theoretical value: 577.2518). Theoretical element content (%) C42H31N3: c, 87.32; h, 5.41; and N, 7.27. Measured elemental content (%): c, 87.40; h, 5.35; and N, 7.32.
Synthetic example 13: synthesis of Compound 9
Synthesis of intermediate e-9
Under the protection of nitrogen, a toluene (250 ml)/ethanol (50 ml)/water (50ml) mixed solvent, f-9(18.97g, 60mmol), i-9(7.62g, 60mmol), Pd (PPh) are added into a three-neck flask in sequence3)4(0.68g, 0.59mmol) and potassium carbonate (11.06g, 80mmol), the reaction was stirred at reflux for 9 hours. After the reaction was complete, it was cooled, 60ml of deionized water was added, stirred, washed, and the organic layer was concentrated under reduced pressure, rinsed with toluene, and purified by recrystallization from toluene to give e-9(16.76g, 77% yield). Mass spectrum m/z: 362.0971 (theoretical value: 362.0983).
Synthesis example 12 the same preparation as in Synthesis example 12 was carried out except that e-9 was replaced with e-1 in equimolar amount to give compound 9(14.53g, yield 72%) having a solid purity of 99.4% by HPLC. Mass spectrum m/z: 672.2945 (theoretical value: 672.2937). Theoretical element content (%) C48H28D5N3O: c, 85.69; h, 5.69; and N, 6.25. Measured elemental content (%): c, 85.77; h, 5.73; n, 6.33.
Synthesis example 14: synthesis of Compound 66
Synthesis example 12 was repeated in the same manner as in Synthesis example 12 except that equimolar amounts of a-1 was replaced with a-66, c-1 was replaced with c-66 and A-1 was replaced with A-66 to give compound 66(14.71g, yield 75%) having a solid purity of 99.3% or more by HPLC. Mass spectrum m/z: 653.2826 (theoretical value: 653.2831). Theoretical element content (%) C48H35N3: c, 88.18; h, 5.40; n, 6.43. Measured elemental content (%): c, 88.27; h, 5.23; and N, 6.50.
Synthetic example 15: synthesis of Compound 81
Synthesis example 12 was repeated in the same manner as in Synthesis example 12 except that equimolar amounts of b-1 was replaced with b-81, c-1 was replaced with c-81, and A-1 was replaced with A-81 to give 81(12.74g, yield 77%) as a compound having a purity of 99.7% by HPLC. Mass spectrum m/z: 551.2352 (theoretical value: 551.2361). Theoretical element content(%)C40H29N3: c, 87.08; h, 5.30; and N, 7.62. Measured elemental content (%): c, 87.17; h, 5.22; and N, 7.58.
Synthetic example 16: synthesis of Compound 126
Synthesis example 12 was repeated in the same manner as in Synthesis example 12 except that equimolar amounts of b-1 was replaced with b-126, c-1 was replaced with c-126, and A-1 was replaced with A-126, to give compound 126(13.16g, yield 71%) having a solid purity of 99.5% or more by HPLC. Mass spectrum m/z: 617.2824 (theoretical value: 617.2831). Theoretical element content (%) C45H35N3: c, 87.49; h, 5.71; and N, 6.80. Measured elemental content (%): c, 87.57; h, 5.63; and N, 6.72.
Synthetic example 17: synthesis of Compound 133
Synthesis example 12 was repeated in the same manner as in Synthesis example 12 except that equimolar amounts of b-1 was replaced with b-133, c-1 was replaced with c-133, and A-1 was replaced with A-133 to give compound 133(11.07g, 73% yield), which was not less than 99.2% pure by HPLC. Mass spectrum m/z: 505.2447 (theoretical value: 505.2456). Theoretical element content (%) C36H23D4N3: c, 85.51; h, 6.18; n, 8.31. Measured elemental content (%): c, 85.45; h, 6.23; and N, 8.25.
Synthetic example 18: synthesis of Compound 157
Synthesis example 12 equimolar of a-1 was replaced with a-157, c-1 was replaced with c-157, and A-1 was replaced with A-157 in accordance with the same phase as in Synthesis example 12By the same method, 157(13.56g, 72% yield) of the compound was obtained, and the purity of the solid was ≧ 99.7% by HPLC. Mass spectrum m/z: 627.2667 (theoretical value: 627.2674). Theoretical element content (%) C46H33N3: c, 88.01; h, 5.30; and N, 6.69. Measured elemental content (%): c, 88.09; h, 5.26; and N, 6.72.
Synthetic example 19: synthesis of Compound 169
Synthesis example 12 was repeated in the same manner as in Synthesis example 12 except that equimolar amounts of a-1 was replaced with a-169, b-1 was replaced with b-169, c-1 was replaced with c-169 and A-1 was replaced with A-169 to give 169(12.98g, yield 75%) having a purity of 99.3% by HPLC. Mass spectrum m/z: 576.2557 (theoretical value: 576.2565). Theoretical element content (%) C43H32N2: c, 89.55; h, 5.59; and N, 4.86. Measured elemental content (%): c, 89.61; h, 5.45; and N, 4.91.
Synthesis example 20: synthesis of Compound 192
Synthesis example 12 the same preparation as in Synthesis example 12 was carried out except that e-192 was used instead of equimolar e-1, to give 192(12.82g, 74% yield) as a compound having a purity of 99.5% or more by HPLC. Mass spectrum m/z: 577.2524 (theoretical value: 577.2518). Theoretical element content (%) C42H31N3: c, 87.32; h, 5.41; and N, 7.27. Measured elemental content (%): c, 87.26; h, 5.38; and N, 7.32.
Synthetic example 21: synthesis of Compound 215
Synthesis example 12 was repeated in the same manner as in Synthesis example 12 except that equimolar of a-1 was replaced with a-215, b-1 was replaced with b-215, c-1 was replaced with c-215, A-1 was replaced with A-215, and e-1 was replaced with e-215 to give compound 215(17.69g, yield 77%) having a purity of 99.6% by HPLC. Mass spectrum m/z: 765.2774 (theoretical value: 765.2780). Theoretical element content (%) C56H35N3O: c, 87.82; h, 4.61; and N, 5.49. Measured elemental content (%): c, 87.77; h, 4.57; n, 5.54.
Synthetic example 22: synthesis of Compound 261
Synthesis example 12 was repeated in the same manner as in Synthesis example 12 except that equimolar of a-1 was replaced with a-261, b-1 was replaced with b-261, c-1 was replaced with c-261, and A-1 was replaced with A-261 to give 261(15.85g, 73% yield) as a compound having a purity of 99.4% by HPLC. Mass spectrum m/z: 723.2668 (theoretical value: 723.2674). Theoretical element content (%) C54H33N3: c, 89.60; h, 4.60; and N, 5.80. Measured elemental content (%): c, 89.55; h, 4.57; and N, 5.76.
Synthetic example 23: preparation of Compound 3-1
Step 1: synthesis of intermediate N-1
To a reaction flask were added compound M-1(13.65g,62.23mmol), L-1(12.47g,60.21mmol), sodium tert-butoxide (8.61g,89.56mmol), palladium acetate (0.27g,1.20mmol), triphenylphosphine (0.31g,1.20mmol) and 250ml toluene in this order, and the mixture was reacted under heating at 90 ℃ for 4.5 hours under argon. After the reaction is finished, the reaction mixture is cooled to room temperature, washed by deionized water, dried by anhydrous magnesium sulfate, concentrated to a small amount, and purified by silica gel column chromatography by using normal hexane as a mobile phase to obtain an intermediate N-1(17.89g, yield 86%), and the purity of solid is not less than 99.5% by HPLC (high performance liquid chromatography). Mass spectrum m/z: 359.1567 (theoretical value: 359.1554).
Step 2: synthesis of Compound 3-1
To a reaction flask were added the intermediates N-1(15.62g,45.21 mmol), X-1(12.81g,43.12mmol), sodium tert-butoxide (6.22g,64.68mmol), Pd in that order2(dba)3(0.79g,0.86mmol), X-Phos (0.41g,0.86mmol) and 200mL of toluene under the protection of argon, heating and refluxing the mixed solution of the reactants for 4 hours, after the reaction is finished, pouring the reaction solution into 500mL of water, adding 400mL of dichloromethane, carrying out layer separation, extracting the water layer for 3 times by using 200mL of dichloromethane, combining organic phases, recovering the solvent under reduced pressure, and recrystallizing the toluene to obtain the compound 3-1(20.34g, yield of 84%), wherein the purity of the solid is not less than 99.3% by HPLC (high performance liquid chromatography). Mass spectrum m/z: 561.2074 (theoretical value: 561.2093). Theoretical element content (%) C42H27NO: c, 89.81; h, 4.85; and N, 2.49. Measured elemental content (%): c, 89.76; h, 4.87; and N, 2.52.
Synthetic example 24: preparation of Compound 3-2
The same procedures used in Synthesis example 23 were repeated except for replacing M-1 and L-1 in Synthesis example 23 with equimolar amounts of M-2 and L-2 to give 3-2(20.59g, yield 85%) having a purity of 99.7% by HPLC. Mass spectrum m/z: 561.2019 (theoretical value: 561.2093). Theoretical element content (%) C42H27NO: c, 89.81; h, 4.85; and N, 2.49. Measured elemental content (%): c, 89.85; h, 4.87; n, 2.44.
Synthetic example 25: preparation of Compounds 3-9
The same procedures used in Synthesis example 23 were repeated except for replacing L-1 in Synthesis example 23 with equimolar amount of L-3 to give compound 3-9(22.83g, yield 83%)) And the purity of the solid is not less than 99.8 percent through HPLC detection. Mass spectrum m/z: 637.2425 (theoretical value: 637.2406). Theoretical element content (%) C48H31NO: c, 90.40; h, 4.90; and N, 2.20. Measured elemental content (%): c, 90.43; h, 4.86; and N, 2.23.
Synthetic example 26: preparation of Compounds 3-38
By substituting M-1, L-1 and X-1 in Synthesis example 23 with equimolar amounts of M-2, L-4 and X-2, the same preparation process as in Synthesis example 23 was carried out to give compound 3-38(22.55g, yield 82%) having a purity of 99.4% by HPLC. Mass spectrum m/z: 637.2425 (theoretical value: 637.2406). Theoretical element content (%) C48H31NO: c, 90.40; h, 4.90; and N, 2.20. Measured elemental content (%): c, 90.35; h, 4.92; and N, 2.24.
Synthetic example 27: preparation of Compounds 3-77
By replacing X-1 in Synthesis example 23 with an equimolar amount of X-3 and following the same preparation method as in Synthesis example 23, Compound 3-77(19.38g, yield 80%) was obtained with a solid purity of 99.6% or more by HPLC. Mass spectrum m/z: 561.2071 (theoretical value: 561.2093). Theoretical element content (%) C42H27NO: c, 89.81; h, 4.85; and N, 2.49. Measured elemental content (%): c, 89.83; h, 4.88; n, 2.44.
Synthetic example 28: preparation of Compounds 3-107
Compound 3-107(21.73g, obtained by substituting M-1 and X-1 in Synthesis example 23 with equimolar amounts of M-3 and X-4, and carrying out the same preparation process as in Synthesis example 23The rate is 79%), and the purity of the solid is not less than 99.5% by HPLC (high performance liquid chromatography). Mass spectrum m/z: 637.2443 (theoretical value: 637.2406). Theoretical element content (%) C48H31NO: c, 90.40; h, 4.90; and N, 2.20. Measured elemental content (%): c, 90.43; h, 4.86; and N, 2.22.
Synthetic example 29: preparation of Compounds 3-117
By substituting L-1 and X-1 in Synthesis example 23 with equimolar amounts of L-3 and X-5, the same preparation process as in Synthesis example 23 was repeated to give 3-117(23.38g, yield 85%) having a purity of 99.3% by HPLC. Mass spectrum m/z: 637.2432 (theoretical value: 637.2406). Theoretical element content (%) C48H31NO: c, 90.40; h, 4.90; and N, 2.20. Measured elemental content (%): c, 90.45; h, 4.88; and N, 2.16.
Synthetic example 30: preparation of Compounds 3-134
By the same method as in Synthesis example 23 except for replacing M-1, L-1 and X-1 in Synthesis example 23 with equimolar amounts of M-2, L-4 and X-6, 3-134(23.10g, yield 84%) was obtained with a solid purity of 99.7% by HPLC. Mass spectrum m/z: 637.2423 (theoretical value: 637.2406). Theoretical element content (%) C48H31NO: c, 90.40; h, 4.90; and N, 2.20. Measured elemental content (%): c, 90.38; h, 4.85; and N, 2.25.
Synthetic example 31: preparation of Compounds 3-194
Synthesis example 23 was repeated in the same manner as in Synthesis example 23 except that M-1, L-1 and X-1 were replaced with equimolar amounts of M-2, L-2 and X-7To obtain the compound 3-194(21.42g, yield 86%), and the solid purity is not less than 99.8% by HPLC. Mass spectrum m/z: 577.1823 (theoretical value: 577.1864). Theoretical element content (%) C42H27And NS: c, 87.32; h, 4.71; and N, 2.42. Measured elemental content (%): c, 87.30; h, 4.75; and N, 2.38.
Synthetic example 32: preparation of Compounds 3-237
By replacing M-1 and L-1 in Synthesis example 23 with equimolar amounts of M-2 and L-5 and following the same preparation method as in Synthesis example 23, Compound 3-237(21.89g, yield 83%) was obtained with a solid purity ≧ 99.5% by HPLC. Mass spectrum m/z: 611.2221 (theoretical value: 611.2249). Theoretical element content (%) C46H29NO: c, 90.32; h, 4.78; and N, 2.29. Measured elemental content (%): c, 90.36; h, 4.75; and N, 2.25.
Synthetic example 33: preparation of Compounds 3-240
By replacing M-1 and L-1 in Synthesis example 23 with equimolar amounts of M-2 and L-6 and following the same preparation method as in Synthesis example 23, 3-240(23.11g, yield 81%) was obtained with a solid purity ≧ 99.4% by HPLC. Mass spectrum m/z: 661.2445 (theoretical value: 661.2406). Theoretical element content (%) C50H31NO: c, 90.74; h, 4.72; and N, 2.12. Measured elemental content (%): c, 90.72; h, 4.69; and N, 2.16.
Comparative example 1 device preparation example:
comparative example 1: the organic electroluminescent device is prepared by a vacuum thermal evaporation method. The experimental steps are as follows: repeatedly washing the ITO glass substrate with a glass cleaning agent, then washing the ITO glass substrate in distilled water for 2 times, ultrasonically washing for 15 minutes, after the washing with the distilled water is finished, ultrasonically washing solvents such as isopropanol, acetone, methanol and the like in sequence, drying at 120 ℃, and conveying to an evaporation plating machine.
Evaporating a hole injection layer compound H1 on the prepared ITO-Ag-ITO glass substrate in a layer-by-layer vacuum evaporation mode: p1 (3%: 97%: mixed)/40 nm, a hole transport layer compound (1-1/52 nm), a luminescent layer (main body RH-3: RH-10: RD-10 (45%: 45%: 10%: mixed))/30 nm, an electron transport layer compound (ET-1/29 nm), an electron injection layer (LiF/1 nm), a cathode Mg-Ag (Mg: Ag doping ratio 9:1)/19nm, and a capping layer compound (3-1/61 nm).
Comparative example 2: a comparative organic electroluminescent element 2 was obtained by replacing the hole transport layer compound 1-1 with the compound HT-1 and the electron transport layer compound ET-1 with the compound 1 in comparative example 1, and the other steps were the same. Comparative example 3: a comparative organic electroluminescent device 3 was obtained by replacing the hole transport layer compound 1-1 of comparative example 1 with the compound HT-1, the other being the same.
Comparative example 4: a comparative organic electroluminescent device 4 was obtained by replacing the hole transport layer compound 1-1 with the compound 1-49 and the capping layer compound 3-1 with the compound 3-9 in comparative example 1, and the other was the same. Comparative example 5: comparative organic electroluminescent element 5 was obtained by replacing hole transport layer compound 1-1 with compound HT-1, electron transport layer compound 1 with compound 66, and capping layer compound 3-1 with compound 3-9 in comparative example 1, the other being the same. Comparative example 6: a comparative organic electroluminescent device 6 was obtained by replacing the hole transport layer compound 1-1 with the compound HT-1 and the capping layer compound 3-1 with the compound 3-9 in comparative example 1, and the other steps were the same.
Comparative example 7: comparative organic electroluminescent element 7 was obtained by replacing hole transport layer compound 1-1 with compound 1-281 and capping layer compound 3-1 with compound 3-134 in comparative example 1, and the other steps were the same. Comparative example 8: a comparative organic electroluminescent element 8 was obtained by replacing the hole transport layer compound 1-1 with the compound HT-1, the electron transport layer compound 1 with the compound 169, and the capping layer compound 3-1 with the compound 3-134 in comparative example 1, which were otherwise the same. Comparative example 9: a comparative organic electroluminescent device 9 was obtained by replacing the hole transport layer compound 1-1 with the compound HT-1 and the capping layer compound 3-1 with the compound 3-134 in comparative example 1, and the other steps were the same.
[ application examples 1 to 11]
Application example 1: the electron transport layer compound ET-1 in comparative example 1 of the organic electroluminescent device was replaced with the compound 1 of the present invention, and the same was repeated except that the organic electroluminescent device 1 was used.
Compounds 1 to 1 in application example 1 were substituted with compounds 1 to 15, compounds 1 to 49, compounds 1 to 95, compounds 1 to 216, compounds 1 to 265, compounds 1 to 268, compounds 1 to 281, compounds 1 to 308, compounds 1 to 313, and compounds 1 to 322 of the present invention, respectively, in this order;
compound 9, compound 66, compound 81, compound 126, compound 133, compound 157, compound 169, compound 192, compound 215, and compound 261, respectively, of the present invention were used in this order instead of compound ET-1 in application example 1;
and organic electroluminescent element application example 2 through application example 11 were prepared in the same manner as in comparative example 1, except that compound 3-1 in application example 1 was replaced with compound 3-2, compound 3-9, compound 3-38, compound 3-77, compound 3-107, compound 3-117, compound 3-134, compound 3-194, compound 3-237, and compound 3-240 according to the present invention, respectively.
A joint IVL test system is formed by test software, a computer, a K2400 digital source meter manufactured by Keithley of the United states and a PR788 spectral scanning luminance meter manufactured by Photo Research of the United states to test the driving voltage and the luminous efficiency of the organic electroluminescent device. The environment of the test is atmospheric environment, and the temperature is room temperature.
The results of the light emission characteristic test of the obtained organic electroluminescent device are shown in table 1. Table 1 shows the results of the test of the light emitting characteristics of the light emitting devices prepared from the compounds prepared in the synthesis examples of the present invention and the comparative materials.
Table 1 test of light emitting characteristics of light emitting device
As can be seen from the results in table 1, the organic electroluminescent device of the present invention has advantages of high luminous efficiency and low driving voltage as compared with comparative examples 1 to 9, and is an organic electroluminescent device having good performance. The combination of the specific hole transport layer material and the specific electron transport layer material reflects the synergistic effect of the hole transport layer and the electron transport layer, and the covering layer material is added, so that the organic electroluminescent device is prepared.
It should be understood that the present invention has been particularly described with reference to particular embodiments thereof, but that various changes in form and details may be made therein by those skilled in the art without departing from the principles of the invention and, therefore, within the scope of the invention.
Claims (10)
1. An organic electroluminescent device comprises a substrate, an anode, an organic layer and a cathode, and is characterized in that the organic layer comprises a hole transport layer and an electron transport layer, the hole transport layer contains a triamine compound represented by a formula I, the electron transport layer contains a heterocyclic compound represented by a formula II,
wherein, in formula I, X is selected from O or S;
the A ring, the B ring or the C ring is independently selected from a benzene ring, a naphthalene ring or no;
the R groups are the same or different from each other and are independently selected from one of methyl, ethyl, phenyl, tolyl, pentadeuterophenyl and naphthyl, or two adjacent R groups can be bonded to form a cyclic structure;
ar is1、Ar2、Ar3、Ar4Independently selected from one of substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl;
said L1、L2、L3、L4、L5、L6Independently selected from a single bond, substituted or unsubstituted arylene of C6-C30, substituted or unsubstituted heteroarylene of C3-C30;
the R is1、R2Independently selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl;
in the formula II, R is0The two R are same or different from each other and are independently selected from one of methyl, ethyl, phenyl, tolyl, pentadeuterated phenyl and naphthyl, or two adjacent R0The group can be bonded with the connected segment to form a spirofluorene cyclic structure;
said X1To X5Are the same or different from each other and are each independently N or C (R)w) And at least one is N, when C (R)w) When there are plural, plural C (R)w) Are identical to or different from each other, wherein RwOne selected from hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl;
Rx、Ry、Rzthe same or different from each other, and are respectively and independently selected from hydrogen, deuterium, halogen group, cyano, nitro, amino, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C1-C15One of unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C2-C20 heteroaryl, or two adjacent groups can be bonded to form a cyclic structure; x is 0, 1,2, 3 or 4; y is 0, 1,2, 3 or 4; z is 0, 1,2, 3 or 4;
l is selected from one of single bond, substituted or unsubstituted arylene of C6-C30 and substituted or unsubstituted heteroarylene of C3-C30;
n is 0, 1,2 or 3.
2. The organic electroluminescent device according to claim 1, wherein the Ar is Ar1、Ar2、Ar3、Ar4Independently selected from one of the following substituents:
the R is11One selected from deuterium, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl, cyclohexyl, adamantyl, norbornyl, phenyl, pentadeuterated phenyl, deuterated naphthyl, tolyl, biphenyl, terphenyl, naphthyl, anthryl, phenanthryl, triphenylene, acridinyl, spirobifluorenyl, 9-dimethylfluorenyl, 9-diphenylfluorenyl, 9-phenylcarbazolyl and pyrenyl;
h is 0, 1,2, 3 or 4; i is 0, 1,2, 3, 4 or 5; j is 0, 1,2, 3, 4, 5, 6 or 7; k is 0, 1,2, 3, 4, 5, 6, 7, 8 or 9.
6. The organic electroluminescent device according to claim 1, wherein R isx、Ry、RzIdentical to or different from each other, each independently selected from hydrogen, deuterium, a halogen group, cyano, nitro, amino, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl or from one of the structures shown below,
7. the organic electroluminescent device according to claim 1, wherein L is selected from the group consisting of a single bond, a substituted or unsubstituted cyclohexylene group, a substituted or unsubstituted adamantyl group, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted terphenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted phenanthrylene group, a substituted or unsubstituted anthrylene group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenylene group, a substituted or unsubstituted benzofluorenylene group, a substituted or unsubstituted dibenzofluorenylene group, a substituted or unsubstituted spirobifluorenylene group, a substituted or unsubstituted benzospirobifluorenylene group, a substituted or unsubstituted pyridinylene group, a substituted or unsubstituted pyrimidinylene group, a substituted or unsubstituted pyridazinyl group, a substituted or unsubstituted triazinylene group, a substituted or unsubstituted quinolinylene group, Substituted or unsubstituted isoquinolinyl, substituted or unsubstituted quinoxalinyl, substituted or unsubstituted quinazolinylene, substituted or unsubstituted phenanthroline, substituted or unsubstituted azaanthracene, substituted or unsubstituted dibenzofuranylene, substituted or unsubstituted dibenzothiophenylene, or substituted or unsubstituted carbazolyl.
8. The organic electroluminescent device according to claim 1, further comprising a capping layer containing a triarylamine compound represented by formula III,
in formula III, the XaSelected from O or S;
ar isa、ArbIndependently selected from one of substituted or unsubstituted C6-C25 aryl and substituted or unsubstituted C2-C20 heteroaryl, with the proviso that AraOr ArbAt least one of them is a condensed ring group;
said La、Lb、LcIndependently selected from a single bond, substituted or unsubstituted arylene of C6-C30, substituted or unsubstituted heteroarylene of C3-C30;
the R isa、RbIndependently selected from hydrogen, deuterium, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted CUnsubstituted C6-C25 aryl, substituted or unsubstituted C2-C20 heteroaryl.
9. The organic electroluminescent device according to claim 8, wherein the Ar isaSelected from substituted or unsubstituted naphthyl, substituted or unsubstituted anthryl, substituted or unsubstituted phenanthryl, substituted or unsubstituted triphenylene, substituted or unsubstituted pyrenyl, substituted or unsubstituted naphthylOne of a substituted or unsubstituted perylene group.
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CN110416422A (en) * | 2018-04-28 | 2019-11-05 | 江苏三月光电科技有限公司 | Organic electroluminescence device and display including it |
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