WO2007132678A1 - 有機エレクトロルミネッセンス素子 - Google Patents
有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2007132678A1 WO2007132678A1 PCT/JP2007/059364 JP2007059364W WO2007132678A1 WO 2007132678 A1 WO2007132678 A1 WO 2007132678A1 JP 2007059364 W JP2007059364 W JP 2007059364W WO 2007132678 A1 WO2007132678 A1 WO 2007132678A1
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- 150000001875 compounds Chemical class 0.000 claims abstract description 89
- 239000000463 material Substances 0.000 claims abstract description 81
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- 125000003118 aryl group Chemical group 0.000 claims description 87
- 125000004429 atom Chemical group 0.000 claims description 63
- 239000000126 substance Substances 0.000 claims description 50
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- 125000004104 aryloxy group Chemical group 0.000 claims description 31
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 22
- 125000000623 heterocyclic group Chemical group 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 19
- 229910052783 alkali metal Inorganic materials 0.000 claims description 18
- 125000003277 amino group Chemical group 0.000 claims description 18
- 125000001424 substituent group Chemical group 0.000 claims description 18
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 17
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 16
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- DMEVMYSQZPJFOK-UHFFFAOYSA-N 3,4,5,6,9,10-hexazatetracyclo[12.4.0.02,7.08,13]octadeca-1(18),2(7),3,5,8(13),9,11,14,16-nonaene Chemical group N1=NN=C2C3=CC=CC=C3C3=CC=NN=C3C2=N1 DMEVMYSQZPJFOK-UHFFFAOYSA-N 0.000 claims description 3
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- UWRZIZXBOLBCON-VOTSOKGWSA-N (e)-2-phenylethenamine Chemical class N\C=C\C1=CC=CC=C1 UWRZIZXBOLBCON-VOTSOKGWSA-N 0.000 description 4
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- 125000002947 alkylene group Chemical group 0.000 description 4
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 4
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
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- 125000006575 electron-withdrawing group Chemical group 0.000 description 4
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- 229960003540 oxyquinoline Drugs 0.000 description 4
- 125000005561 phenanthryl group Chemical group 0.000 description 4
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- YJTKZCDBKVTVBY-UHFFFAOYSA-N 1,3-Diphenylbenzene Chemical group C1=CC=CC=C1C1=CC=CC(C=2C=CC=CC=2)=C1 YJTKZCDBKVTVBY-UHFFFAOYSA-N 0.000 description 3
- 239000005725 8-Hydroxyquinoline Substances 0.000 description 3
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- 230000000052 comparative effect Effects 0.000 description 3
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- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
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- 125000004957 naphthylene group Chemical group 0.000 description 3
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- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
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- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical group [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 125000001544 thienyl group Chemical group 0.000 description 3
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- VERMWGQSKPXSPZ-BUHFOSPRSA-N 1-[(e)-2-phenylethenyl]anthracene Chemical class C=1C=CC2=CC3=CC=CC=C3C=C2C=1\C=C\C1=CC=CC=C1 VERMWGQSKPXSPZ-BUHFOSPRSA-N 0.000 description 2
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- WZJYKHNJTSNBHV-UHFFFAOYSA-N benzoquinoline Natural products C1=CN=C2C3=CC=CC=C3C=CC2=C1 WZJYKHNJTSNBHV-UHFFFAOYSA-N 0.000 description 2
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- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
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- 125000004106 butoxy group Chemical group [*]OC([H])([H])C([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 2
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- NRNFFDZCBYOZJY-UHFFFAOYSA-N p-quinodimethane Chemical class C=C1C=CC(=C)C=C1 NRNFFDZCBYOZJY-UHFFFAOYSA-N 0.000 description 2
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- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 2
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical class 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 2
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- PCCVSPMFGIFTHU-UHFFFAOYSA-N tetracyanoquinodimethane Chemical compound N#CC(C#N)=C1C=CC(=C(C#N)C#N)C=C1 PCCVSPMFGIFTHU-UHFFFAOYSA-N 0.000 description 2
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M thiocyanate group Chemical group [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 2
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- 125000003866 trichloromethyl group Chemical group ClC(Cl)(Cl)* 0.000 description 1
- 125000005034 trifluormethylthio group Chemical group FC(S*)(F)F 0.000 description 1
- 125000003652 trifluoroethoxy group Chemical group FC(CO*)(F)F 0.000 description 1
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 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
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
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- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
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- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/484—Insulated gate field-effect transistors [IGFETs] characterised by the channel regions
- H10K10/488—Insulated gate field-effect transistors [IGFETs] characterised by the channel regions the channel region comprising a layer of composite material having interpenetrating or embedded materials, e.g. a mixture of donor and acceptor moieties, that form a bulk heterojunction
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/19—Tandem OLEDs
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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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- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
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- 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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- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
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- H10K85/649—Aromatic compounds comprising a hetero atom
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- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1044—Heterocyclic compounds characterised by ligands containing two nitrogen atoms as heteroatoms
Definitions
- the present invention relates to an organic electoluminescence (EL) device.
- EL elements using electroluminescence are highly visible due to self-emission and are completely solid elements, and thus have excellent features such as excellent impact resistance. Therefore, as EL elements in various display devices, The use of is attracting attention.
- This EL device includes an inorganic EL device using an inorganic compound as a light emitting material and an organic EL device using an organic compound.
- the organic EL device particularly reduces the applied voltage significantly.
- it since it is easy to achieve full color and surface light emission with low power consumption is possible, it has been developed as a next-generation light-emitting element.
- Patent Documents 1 to 3 As one of such long-life and high-efficiency technologies, there is a technology in which a plurality of cathode Z organic light emitting layer Z anode units are stacked (for example, Patent Documents 1 to 3). Compared to a single-layer device, the current density is low to obtain the same luminance, and there is an advantage that the device life can be extended. However, these techniques have a problem in that the driving voltage becomes extremely high because a plurality of elements are stacked in series.
- Patent Document 1 Japanese Patent Laid-Open No. 6-176870
- Patent Document 2 Japanese Patent Laid-Open No. 11-312584
- Patent Document 3 Japanese Patent Laid-Open No. 11 312585
- the present invention has been made in view of the above-described problems, and an object thereof is to provide a high-efficiency and low-voltage organic EL element even when a plurality of light-emitting layers are stacked in series.
- the following organic EL device is provided.
- At least two organic light emitting layers are interposed between an anode and a cathode, and the organic light emitting layer There is provided at least one intermediate connection layer therebetween, and the intermediate connection layer includes, from the cathode side, an electron transport material layer including an acceptor layer, a donor layer, and a compound containing a non-complex nitrogen-containing heterocyclic structure in this order.
- An organic-elect mouth luminescence element is provided.
- ⁇ is a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 60 nuclear atoms, a substituted or unsubstituted heteroaryl group having 5 to 60 nuclear atoms, a substituted or unsubstituted group, respectively.
- An amino group, a halogen atom, a cyano group, a nitro group, a hydroxyl group, or a carboxyl group, substituted with an aryl group having 5 to 50 nuclear atoms, substituted or unsubstituted, and adjacent to A pair is tied together And may form an aromatic ring or a heterocyclic ring.
- R 9 to R 2 ° are each a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 60 nuclear atoms, a substituted or unsubstituted heteroaryl group having 5 to 60 nuclear atoms, substituted or unsubstituted, An unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 nuclear atoms, a substituted or unsubstituted carbon number 1 ⁇ 50 alkoxy group, substituted or unsubstituted aryloxy group having 5 to 50 carbon atoms, substituted or unsubstituted aryloxy group having 5 to 50 nucleus atoms, substituted or unsubstituted carbon atoms 1 to 50 An alkoxycarbonyl group, an amino group substituted with a substituted with a
- (L is a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, a substituted or unsubstituted heteroarylene group having 5 to 60 carbon atoms, or a substituted or unsubstituted fluorenylene group,
- Ar 1 is a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, a substituted or unsubstituted pyridylene group, or a substituted or unsubstituted quinolylene group,
- Ar 2 is a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 60 nuclear atoms, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted carbon number of 1 to 50.
- Donor of the donor layer is alkali metal, alkaline earth metal, rare earth metal, alkali metal oxide, alkali metal halide, alkaline earth metal oxide, alkaline earth metal halide Organic electroluminescence according to any one of 1 to 5, which is a porcelain, rare earth metal oxide, rare earth metal halide, alkali metal organic complex, alkaline earth metal organic complex, and rare earth metal organic complex element.
- the acceptor force of the acceptor layer The organic electoluminescence element according to any one of 1 to 6, which is an organic compound having an electron-withdrawing substituent or an electron-deficient ring Child.
- acceptor force of the acceptor layer 7.
- FIG. 1 is a diagram showing a first embodiment of an organic EL device according to the present invention.
- FIG. 2 is a view showing an intermediate connection layer of the organic EL element shown in FIG.
- the organic EL device of the present invention includes at least two organic light emitting layers interposed between an anode and a cathode, and includes at least one intermediate connection layer between the organic light emitting layers.
- the intermediate connection layer is formed by laminating an acceptor layer, a donor layer, and an electron transport material layer containing a compound containing a non-complex nitrogen-containing heterocyclic structure in this order from the cathode side.
- FIG. 1 is a view showing an embodiment of the organic EL device of the present invention.
- This organic EL device is an example in which three organic light emitting layers are laminated.
- a transparent anode 20 is provided on a support substrate 10, and a cathode 50 is provided opposite to the transparent anode 20.
- the first organic light emitting layer 30, the second organic light emitting layer 32, the third organic light emitting layer 34, the first intermediate connection layer 40, and the second intermediate light emitting layer 34 are provided between the transparent anode 20 and the cathode 50.
- a connection layer 42 is provided.
- the first intermediate connection layer 40 is between the first organic light-emitting layer 30 and the second organic light-emitting layer 32
- the second intermediate connection layer 42 is the second organic light-emitting layer 32 and the third organic light-emitting layer 32. It is interposed between the light emitting layers 34. Light emitted from the organic light emitting layers 30, 32, and 34 is extracted from the support substrate 10 through the transparent anode 20.
- FIG. 2 is a diagram showing the intermediate connection layers 40 and 42 of the present invention.
- the intermediate connection layers 40 and 42 are formed by laminating an acceptor layer 60, a donor layer 70, and an electron transport material layer 80 containing a compound containing a non-complex nitrogen-containing heterocyclic structure in this order from the cathode 50 side.
- the configuration is as follows.
- the acceptor layer 60 refers to extracting electrons from an adjacent organic light emitting layer.
- the donor layer 70 is a layer that receives electrons from the acceptor layer and injects electrons into the electron transport material layer (donates electrons).
- the electron transport material layer 80 is a layer that injects electrons into the adjacent organic light emitting layer.
- first organic light emitting layer 30 of the element 1 light is emitted by injecting holes from the anode 20 and injecting electrons from the electron transport material layer of the first intermediate connection layer 40. Electrons are transferred from the acceptor layer to the electron transport material layer of the first intermediate connection layer 40 through the donor layer.
- the second organic light emitting layer 32 holes are injected from the acceptor layer of the first intermediate connection layer 40, and electrons are injected from the electron transport material layer of the second intermediate connection layer 42. It emits light. Electrons are transferred to the electron transport material layer 80 of the first intermediate connection layer 40 through the donor layer as well as the acceptor layer force. Electrons are transferred from the acceptor layer to the electron transport material layer of the second intermediate connection layer 42 through the donor layer.
- the acceptor layer force of the second intermediate connection layer 42 also emits light by injecting holes. Electrons are transferred from the acceptor layer to the electron transport material layer 80 of the second intermediate connection layer 42 through the donor layer.
- the present invention can reduce the voltage by using a specific electron transport material layer for the intermediate connection layer. For this reason, an organic EL element in which organic light emitting layers are stacked is easy to increase the voltage, but even such a stacked organic EL element can achieve a lower voltage and higher efficiency.
- the three organic light emitting layers 30, 32, 34 and the two intermediate connection layers 40, 42 may be different or the same.
- three organic light emitting layers are laminated, but two or four or more layers may be laminated. Further, in this embodiment, it is sufficient that there is at least one intermediate connection layer having the laminated structure shown in FIG. 2 between the two organic light emitting layers. Therefore, when there are other organic light-emitting layers, different organic light-emitting layers may be in direct contact with each other and V may be used, or a normal intermediate connection layer may be interposed instead of the laminated structure shown in FIG. ⁇ .
- the transparent electrode may be a power cathode that is an anode.
- book The organic EL element of the invention may be a top emission type or a bottom emission type. Even in the case of the V-shift type, the electrode from which light is extracted becomes light transmissive.
- the support substrate is a member for supporting the organic EL element, and therefore it is preferable that the support substrate is excellent in mechanical strength and dimensional stability.
- a substrate include a glass plate, a metal plate, a ceramic plate, or a plastic plate (polycarbonate resin, acrylic resin, vinyl chloride resin, polyethylene terephthalate resin, polyimide resin, polyester resin. Resin, epoxy resin, phenol resin, silicon resin, fluorine resin, etc.).
- the substrate made of these materials is further formed with an inorganic film or coated with fluorine resin to prevent moisture or hydrophobic treatment. Is preferably applied.
- the moisture content of the support substrate is 0.0001 wt% or less and the gas permeability coefficient is 1 ⁇ 10 ” 13 cc-cm / cm 2 -Sec. CmHg or less.
- the supporting substrate side force also extracts light
- anode it is preferable to use a metal, an alloy, an electrically conductive compound, or a mixture thereof having a high work function (for example, 4. OeV or more).
- a metal, an alloy, an electrically conductive compound, or a mixture thereof having a high work function for example, 4. OeV or more.
- ITO indium tin oxide
- IZO indium-zinc oxide
- indium copper, tin, zinc oxide, gold, platinum, noradium, etc. alone or in combination of two or more Can be used in combination.
- the anode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering. Further, the thickness of the anode is not particularly limited. 1S is preferably 10 to 1000 nm, and more preferably 10 to 200 nm. Further, when taking out the light emitted from the organic light emitting medium layer from the anode to the outside, it is preferable that Is transparent, that is, the light transmittance is 50% or more.
- the cathode preferably uses a metal, an alloy, an electrically conductive compound or a mixture thereof having a low work function (eg, less than 4. OeV). Specifically, one of magnesium, aluminum, indium, lithium, sodium, cesium, silver and the like can be used alone or in combination of two or more.
- the thickness of the cathode is not particularly limited, but is preferably 10 to 1000 nm, more preferably 10 to 200 nm.
- the organic light emitting layer includes an organic light emitting medium layer capable of EL emission by recombination of electrons and holes.
- Such an organic light emitting layer can be constituted by laminating the following layers, for example.
- the configuration (iv) is usually preferably used because it can provide higher emission luminance and is excellent in durability.
- the light emitting medium layer of the organic EL element has the following functions (1) to (3).
- Injection function Function that can inject holes from the anode or hole injection layer when an electric field is applied, and can inject electrons from the cathode or electron injection layer
- Transport function Function to move injected charges (electrons and holes) by the force of electric field
- Luminescent function a function that provides a field for recombination of electrons and holes and connects this to light emission.However, there is no difference between the ease of hole injection and the ease of electron injection.
- the transport capacity expressed by the mobility of holes and electrons may be large or small, but it is preferable to move one of the charges.
- the luminescent medium layer is particularly preferably a molecular deposited film.
- the molecular deposition film is formed by deposition from a material compound in a gas phase state. This is a thin film or a film formed by solidification from a material compound in a solution state or a liquid phase state.
- this molecular deposited film has a cohesive structure and high structure from a thin film (molecular accumulated film) formed by the LB method. It can be classified by the difference in the next structure and the functional difference resulting from it.
- a binder such as rosin and a material compound are mixed with a solvent.
- the light emitting medium layer can also be formed by forming a solution by dissolving the solution in a thin film and then thinly forming the solution by a spin coating method or the like.
- Examples of the light emitting material or doping material that can be used for the organic light emitting medium layer include arylamine compounds and Z or styrylamine compounds, anthracene, naphthalene, phenanthrene, pyrene, tetracene, coronene, taricene, fluorescein, perylene, and lid-periphery.
- Lene Naphtha-perylene, Perinone, Lid-perinone, Naphtal-perinone, Diphenylbutadiene, Tetraphenylbutadiene, Coumarin, Oxadiazole, Ardazine, Bisbenzoxazoline, Bisstyryl, Pyrazine, Cyclopentagen, Quinoline metal complex, Aminoquino Phosphorus metal complex, benzoquinoline metal complex, imine, diphenylethylene, berylanthracene, diaminocarbazole, pyran, thiopyran, polymethine, merocyanine, imidazole chelate Examples thereof include, but are not limited to, oxinoid compounds, quinacridone, rubrene, and fluorescent dyes.
- the organic light emitting medium layer preferably contains an arylamine compound and Z or a styrylamine compound.
- Examples of the arylamine compounds include compounds represented by the following formula (A), and examples of the styrylamine compounds include compounds represented by the following formula (B).
- Ar is phenyl, biphenyl, terpheal, stilbene or distyryl aryl
- Ar 3 2 and Ar 3 3 are each a hydrogen atom or a substituted or unsubstituted carbon number of 6 to 6.
- 20 is an aromatic group
- p ′ is an integer of 1 to 4. More preferably, Ar 3 2 and Z or Ar 3 are substituted with a styryl group.
- the aromatic group having 6 to 20 carbon atoms is preferably a phenyl group, a naphthyl group, an anthracyl group, a phenanthryl group, a terphenyl group, or the like.
- Ar 3M to Ar 3G6 is a substituted or unsubstituted Ariru group having a carbon number of 5 to 40.
- Q is an integer from 1 to 4.
- aryl groups having 5 to 40 nuclear atoms include phenyl, naphthyl, anthracyl, phenanthryl, pyrenyl, chrysenyl, coroninole, biphenyl, terphenyl, pyrrolyl, furanyl, thiophenyl, benzothiophenyl, oxadiazolyl.
- Diphenylanthracenyl, indolyl, carbazolyl, pyridyl, benzoquinolyl, fluoranthenyl, acenaphthofluoranthur, stilbene and the like are preferable.
- the aryl group having 5 to 40 nuclear atoms may be further substituted with a substituent.
- Examples of the preferred substituent include alkyl groups having 1 to 6 carbon atoms (ethyl group, methyl group, isopropyl group, n- Propyl group, s-butyl Group, t-butyl group, pentyl group, hexyl group, cyclopentyl group, cyclohexyl group, etc.), alkoxy group having 1 to 6 carbon atoms (ethoxy group, methoxy group, isopropoxy group, n-portoxy group, s butoxy group, t butoxy group, pentoxy group, hexyloxy group, cyclopentoxy group, cyclohexyloxy group, etc.), aryl group having 5 to 40 nuclear atoms, amino group substituted with aryl group having 5 to 40 nuclear atoms Groups, ester groups having an aryl group having 5 to 40 nuclear atoms, ester groups having an alkyl group having 1 to 6 carbon atoms, cyan groups, nitro groups, hal
- Ar and Ar ′ are each a substituted or unsubstituted aryl group having 5 to 60 nucleus atoms or a substituted or unsubstituted heteroaryl group having 5 to 60 nucleus atoms.
- X is substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms, substituted or unsubstituted heteroaryl group having 5 to 50 nuclear atoms, substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, substituted Or an unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 carbon atoms, a substituted or unsubstituted aryloxy group having 5 to 50 nucleus atoms, a substituted or unsubstituted nucleus.
- a and b are each an integer of 0 to 4.
- n is an integer of 1 to 3.
- Ar 1 and Ar 2 are each a substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 60 nuclear atoms.
- n are each an integer of 1 to 4.
- R ⁇ R 10 ⁇ each hydrogen atom, substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms, substituted or unsubstituted heteroaryl group having 5 to 50 nuclear atoms, substituted or unsubstituted carbon atoms 1 to 50 alkyl groups, substituted or unsubstituted cycloalkyl groups, substituted or unsubstituted alkoxy groups having 1 to 50 carbon atoms, substituted or unsubstituted aralkyl groups having 6 to 50 carbon atoms, substituted or unsubstituted Aryloxy group having 5 to 50 nucleus atoms, substituted or unsubstituted aryloxy group having 5 to 50 nucleus atoms, substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, substituted or unsubstituted silyl group Group, carboxyl group, halogen atom, cyano group, nitro group or hydroxyl group
- ⁇ 1 and ⁇ 2 are each a substituted or unsubstituted condensed aromatic ring group having 10 to 20 nuclear carbon atoms.
- Ar 3 and Ar 4 are each a hydrogen atom or a substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms.
- R ⁇ R 10 ⁇ each hydrogen atom, substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms, substituted or unsubstituted heteroaryl group having 5 to 50 nuclear atoms, substituted or unsubstituted carbon atoms 1 to 50 alkyl groups, substituted or unsubstituted cycloalkyl groups, substituted or unsubstituted alkoxy groups having 1 to 50 carbon atoms, substituted or unsubstituted aralkyl groups having 6 to 50 carbon atoms, substituted or unsubstituted Aryloxy group having 5 to 50 nucleus atoms, substituted or unsubstituted aryloxy group having 5 to 50 nucleus atoms, substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, substituted or unsubstituted silyl group Group, carboxyl group, halogen atom, cyano group, nitro group or hydroxyl group
- Ar 3 , Ar 4 , R 9 and R 1 May be a plurality or adjacent ones may form a saturated or unsaturated cyclic structure.
- 1 ⁇ to ° are each a hydrogen atom, an alkyl group, a cycloalkyl group, a substituted or unsubstituted aryl group, an alkoxyl group, an aryloxy group, an alkylamino group, an alkyl group, an aryl group, or a substituted group. Or an unsubstituted heterocyclic group is shown.
- a and b each represent an integer of 1 to 5, and when they are 2 or more, R 11 or R 12 may be the same or different, and R 11 or R 12 are bonded to each other.
- a ring may be formed, or R 13 and R 14 , R 15 and R 16 , R 17 and R 18 , R 19 and R 2 may be bonded to each other to form a ring.
- L 1 represents a single bond, -0-, -S-, N (R) — (where R is an alkyl group or a substituted or unsubstituted aryl group), an alkylene group or an arylene group. )
- R to R dU are a hydrogen atom, an alkyl group, a cycloalkyl group, and an aryl group, respectively. Represents an alkoxyl group, an aryloxy group, an alkylamino group, an arylamino group, or a substituted or unsubstituted multiple ring group.
- C d, e and f each represent an integer of 1 to 5, and when they are 2 or more, R 21 , R 2 2 , R 26, or R 27 may be the same or different. Further, R 21 , R 22 , R 26 or R 27 may be bonded to form a ring, or R 23 and R 24 , R 28 and R 29 may be bonded to each other to form a ring. You can form,
- L 2 represents a single bond, -0-, -S-, —N (R) — (R is an alkyl group or a substituted or unsubstituted aryl group), an alkylene group or an arylene group. )
- each X 1 is a substituted or unsubstituted pyrene residue.
- a 3 and B 1 are each a hydrogen atom, a substituted or unsubstituted aromatic hydrocarbon group having 3 to 50 nuclear carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 1 to 50 nuclear carbon atoms, substituted or unsubstituted Is an unsubstituted alkyl group or alkylene group having 1 to 50 carbon atoms, or a substituted or unsubstituted alkyl group or alkylene group having 1 to 50 carbon atoms.
- Ar 5 is a substituted or unsubstituted aromatic hydrocarbon group having 3 to 50 nuclear carbon atoms or a substituted or unsubstituted aromatic heterocyclic group having 1 to 50 nuclear carbon atoms, respectively.
- Y 1 is each a substituted or unsubstituted aryl group.
- f is an integer from 1 to 3
- e and i are each an integer from 0 to 4
- h is an integer from 0 to 3
- g is an integer from 1 to 5.
- Ar 6 and Ar 7 are each a substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms.
- L 3 and L 4 are each a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthalene group, a substituted or unsubstituted fluorenylene group, or a substituted or unsubstituted dibenzosilolylene group.
- n is an integer from 1 to 4
- s is an integer from 0 to 2
- t is an integer from 0 to 4.
- L 3 or Ar 6 is bonded to any one of positions 1 to 5 of pyrene, and L 4 or Ar 7 is bonded to pyrene.
- a spio-mouth fluorene derivative represented by the following formula (8) A spio-mouth fluorene derivative represented by the following formula (8).
- a 4 to A ′ are each a substituted or unsubstituted biphenyl group or a substituted or unsubstituted naphthyl group.
- a 8 to A 13 are each a hydrogen atom or a substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms.
- R 31 to R 33 are each a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, an alkoxyl group having 1 to 6 carbon atoms, an aryloxy group having 5 to 18 carbon atoms, or a carbon number. 7 to 18 aralkyloxy group, 5 to 16 carbon atom arylamino group, nitro group, cyano group, 1 to 6 carbon ester group or halogen atom.
- At least one of A 8 to A 13 is a group having three or more condensed aromatic rings.
- R 36 and R 37 are each a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic ring.
- R 36 and R 37 bonded to different fluorene groups may be the same or different
- R 36 and R 37 bonded to the same fluorene group may be the same or different It may be.
- Ar 8 and Ar 9 are substituted or unsubstituted condensed polycyclic aryl groups having a total of 3 or more benzene rings or substituted or unsubstituted carbons having a total of 3 or more benzene rings and heterocyclic rings to form a fluorene group.
- a condensed polycyclic heterocyclic group to be bonded is shown, and Ar 8 and Ar 9 may be the same or different.
- n an integer of 1 to 10.
- an anthracene derivative is preferable, a monoanthracene derivative is more preferable, and an asymmetric anthracene is particularly preferable.
- a phosphorescent compound can also be used.
- a compound containing a force rubazole ring as the host material is preferable.
- a phosphorescent dopant is a compound capable of emitting triplet exciton force, and is not particularly limited as long as it emits light from triplet exciton, but also has a group force consisting of Ir, Ru, Pd, Pt, Os and Re.
- a metal complex containing at least one selected metal is preferred.
- a host suitable for phosphorescence emission having a compound power containing a force rubazole ring has a function of emitting a phosphorescence emission compound as a result of energy transfer from its excited state to the phosphorescence emission compound. It is a compound that has.
- the host compound can be appropriately selected according to the purpose without any limitation as long as it is a compound that can transfer the exciton energy to the phosphorescent compound. It has an optional heterocycle other than a forceful rubazole ring.
- host compounds include force rubazole derivatives, triazole derivatives, oxazole derivatives, oxaziazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, furan diamine derivatives, arylamine derivatives , Amino-substituted chalcone derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aromatic tertiary amine compounds, styrylamine compounds, aromatic dimethylidene compounds, porphyrin compounds, anthraquinodis Methane derivatives, anthrone derivatives, diphenylquinone derivatives, Heterocyclic tetracarboxylic acid anhydrides such as obilane dioxide derivatives, carpositimide derivatives, fluorenylidenemethane derivatives, distyryl
- high molecular compounds such as molecular oligomers, polythiophene derivatives, polyphenylene derivatives, polyphenylene vinylene derivatives, polyfluorene derivatives, and the like.
- the host compound may be used alone or in combination of two or more.
- the phosphorescent dopant is a compound capable of emitting triplet exciton power.
- the triplet exciton force is not particularly limited as long as it emits light, but a group complex of Ir, Ru, Pd, Pt, Os, and Re force is preferably a metal complex containing at least one selected metal, and is preferably a porphyrin metal complex or ortho metal ion. ⁇ Metal complexes are preferred.
- the porphyrin metal complex is preferably a porphyrin platinum complex.
- the phosphorescent compound may be used alone or in combination of two or more.
- ligands that form ortho-metalated metal complexes, but it is preferable! / ⁇
- the ligand include 2 phenyl pyridine derivatives, 7,8 benzoquinoline derivatives, 2- (2 chayl) pyridine derivatives, 2- (1 naphthyl) pyridine derivatives, 2-phenol quinolin derivatives, and the like. . These derivatives may have a substituent if necessary. In particular, fluorinated compounds and trifluoromethyl groups introduced are preferred as blue dopants. Further, it may have a ligand other than the above ligands such as acetylylacetonate and picric acid as an auxiliary ligand.
- the content of the phosphorescent dopant in the light emitting medium layer is not particularly limited, and can be appropriately selected according to the purpose.
- the content is 0.1 to 70% by mass, and 1 to 3 0% by mass is preferred.
- the phosphorescent emissive compound content is less than 0.1% by mass, the light emission is weak and the effect of the content is not fully exhibited.
- the content exceeds 70% by mass, the phenomenon called concentration quenching occurs. May become noticeable and the device performance may be reduced.
- the light emitting medium layer may contain a hole transport material, an electron transport material, and a polymer binder as necessary.
- the film thickness of the luminescent medium layer is preferably 5 to 50 nm, more preferably 7 to 50 nm, and most preferably 10 to 50 nm. If the thickness is less than 5 nm, it is difficult to form a light-emitting medium layer, and it may be difficult to adjust the chromaticity. If the thickness exceeds 50 nm, the driving voltage may increase.
- a hole injection / transport layer may be further laminated on the anode side of the organic light emitting medium layer.
- the hole injection / transport layer is a layer that helps injecting holes into the luminescent medium layer and transports them to the luminescent region, and has a high ion mobility with a high hole mobility, usually less than 5.5 eV.
- a material that transports holes to the light-emitting medium layer with a lower electric field strength is preferred.
- the mobility force of holes is, for example, 10 4 to: L0 6 V / cm. At least 10 _4 cm 2 ZV ⁇ sec is preferred when an electric field is applied.
- the material for forming the hole injecting / transporting layer is not particularly limited as long as it has the above-mentioned preferred properties, and is conventionally used as a charge transporting material for holes in photoconductive materials.
- any known one used for the hole injection and transport layer of the organic EL device can be selected and used.
- JP-A-2-204996 polysilane
- aniline-based copolymer JP-A-2-282263
- JP-A-1-211399 examples thereof include conductive polymer oligomers (particularly thiophene oligomers).
- the above-described materials can be used as the material for the hole injection 'transport layer.
- Volphiline compounds (disclosed in JP-A-63-29556965, etc.), aromatic tertiary amine compounds And styrylamine compounds (US Pat. No. 4,127,412, JP-A 53-27033, 54-58445, 54-149634, 54-64299) No. 55-79450, No. 55-144250, No. 56-119132, No. 61-295558, No. 61-98353, No. 63-295695, etc.), especially fragrance It is preferable to use a group III tertiary amine compound.
- hole injection / transport material that can be used in the hole injection / transport layer
- a compound represented by the following formula is preferable.
- Ar dll to Ar dM are each independently a substituted or unsubstituted aryl group having 6 to 50 nuclear carbon atoms, and R 311 to R 312 are each independently a hydrogen atom, substituted or unsubstituted. And an aryl group having 6 to 50 nuclear carbon atoms or an alkyl group having 1 to 50 carbon atoms, and m and n are integers of 0 to 4.
- the aryl group having 6 to 50 nuclear carbon atoms is preferably a phenyl, naphthyl, biphenyl, terphel, phenanthryl group or the like.
- the aryl group having 6 to 50 nuclear carbon atoms may be further substituted with a substituent.
- Preferred substituents include alkyl groups having 1 to 6 carbon atoms (methyl group, ethyl group, isopropyl group, n -Propyl group, s-butyl group, t-butyl group, pentyl group, hexyl group, cyclopentyl group, cyclohexyl group, etc.), and an amino group substituted with an aryl group having 6 to 50 nuclear carbon atoms.
- there are two condensed aromatic rings described in US Pat. No. 5,061,569 in the molecule for example, 4,4,1bis (N— (1-naphthyl) N phenol.
- NPD -Luamino bi-fel
- MTDATA tri-feramine triphenylamine
- inorganic compounds such as p-type Si and p-type SiC can also be used as the material for the hole injection / transport layer.
- the hole injecting / transporting layer can be formed by thin-filming the above compound by a known method such as a vacuum deposition method, a spin coating method, a casting method, or an LB method.
- the thickness of the hole injecting / transporting layer is not particularly limited, but is usually 5 ⁇ to 5 / ⁇ .
- the hole injection / transport layer may be composed of one or more of the above-described materials as long as it contains the above compound in the hole transport zone. A layer in which a hole injecting / transporting layer made of a different kind of compound is laminated may be used.
- An electron injection / transport layer may be further laminated on the cathode side of the organic light emitting medium layer.
- the electron injection 'transport layer is a layer that assists the injection of electrons into the luminescent medium layer, and has a high electron mobility.
- the electron transport layer is appropriately selected with a film thickness of several nm to several; zm. In order to avoid an increase in voltage, especially when the film thickness is large, the electron mobility is 10 4 to: when applying an electric field of L0 6 V / cm. desirable is least 10 _5 cm 2 ZVs more.
- 8-hydroxyquinoline and its derivative metal complex or a compound having a nitrogen-containing heterocyclic ring are suitable.
- metal chelate oxinoid compounds including chelates (generally 8-quinolinol or 8-hydroxyquinoline).
- Alq having A1 as the central metal can be used as the electron injection / transport layer.
- Ar 321 , Ar 322 , Ar 323 , Ar 325 , Ar 326 , Ar 329 each represent a substituted or unsubstituted aryl group, and may be the same or different from each other.
- Ar 324 , Ar ⁇ 27 and Ar 328 represent a substituted or unsubstituted arylene group, which may be the same or different.
- examples of the aryl group include a phenyl group, a biphenyl group, an anthryl group, a perylenyl group, and a pyrenyl group.
- examples of the arylene group include a phenylene group, a naphthylene group, a biphenylene group, an anthrene group, a perylene group, and a pyrenylene group.
- substituent include an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, and a cyan group.
- This electron transfer compound is preferably a thin film forming material.
- electron-transmitting compound examples include the following.
- Me represents a methyl group
- Bu represents a butyl group
- Nitrogen-containing heterocyclic derivative represented by the following formula
- a ddl to A ddd are a nitrogen atom or a carbon atom.
- R 331 and R 332 are a substituted or unsubstituted aryl group having 6 to 60 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 60 carbon atoms, an alkyl group having 1 to 20 carbon atoms, and a carbon number of 1
- a haloalkyl group of -20 or an alkoxy group of 1-20 carbon atoms n is an integer of 0 to 5, and when n is an integer of 2 or more, a plurality of R 331 may be the same or different from each other Good.
- a plurality of adjacent R 331 groups may be bonded to each other to form a substituted or unsubstituted carbocyclic aliphatic ring, or a substituted or unsubstituted carbocyclic aromatic ring.
- Ar 331 is a substituted or unsubstituted aryl group having 6 to 60 carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 60 carbon atoms.
- Ar 331 ′ is a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, or a substituted or unsubstituted heteroarylene group having 3 to 60 carbon atoms.
- Ar 332 is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a haloalkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 60 carbon atoms, or a substitution Alternatively, it is an unsubstituted heteroaryl group having 3 to 60 carbon atoms.
- any one of Ar 331 and Ar 332 is a substituted or unsubstituted condensed ring group having 10 to 60 carbon atoms, or a substituted or unsubstituted hetero condensed ring group having 3 to 60 carbon atoms.
- L 332 and L 333 are each a single bond, a substituted or unsubstituted fused ring having 6 to 60 carbon atoms, a substituted or unsubstituted heterofused ring having 3 to 60 carbon atoms, or a substituted or unsubstituted fluorene. It is a group. )
- HAr is a substituted or unsubstituted nitrogen-containing heterocycle having 3 to 40 carbon atoms
- L 341 is a single bond, a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 60 carbon atoms, or a substituted or unsubstituted fluorylene group.
- Ar 341 is a substituted or unsubstituted divalent aromatic hydrocarbon group having 6 to 60 carbon atoms
- Ar 342 is a substituted or unsubstituted aryl group having 6 to 60 carbon atoms or a substituted or unsubstituted carbon group. It is a heteroaryl group having 3 to 60 carbon atoms.
- X d51 and Y d51 each independently represent a saturated or unsaturated hydrocarbon group having 1 to 6 carbon atoms, an alkoxy group, an alkoxy group, an alkyloxy group, a hydroxy group, a substituted or unsubstituted group.
- R 351 to R 354 each independently represents hydrogen, halogen, a substituted or unsubstituted hetero ring, or a structure in which X 351 and Y 3 51 are combined to form a saturated or unsaturated ring.
- X dbl and Y dbl are each independently a saturated or unsaturated hydrocarbon group having 1 to 6 carbon atoms, an alkoxy group, an alkenyloxy group, an alkynyloxy group, a substituted or unsubstituted group.
- R d ′′ to R d and Z d ′′ are each independently a hydrogen atom, a saturated or unsaturated hydrocarbon group, an aromatic group, a heterocyclic group, a substituted amino group, a substituted boryl group, or an alkoxy group.
- Each represents an aryloxy group
- ⁇ 371 , ⁇ 371 and z 371 each independently represent a saturated or unsaturated hydrocarbon group, aromatic group, heterocyclic group, substituted amino group, alkoxy group or aryloxy group.
- Z 371 and Z 372 may be bonded to each other to form a condensed ring.
- N represents an integer of 1 to 3, and when n is 2 or more, Z 371 may be different.
- N is 1, X 371 , Y 371 and R 372 acetyl group
- R 378 is a hydrogen atom or a substituted boryl group
- n force ⁇ and Z 371 is a methyl group.
- 81 is a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or Unsubstituted aryl group, substituted or unsubstituted heterocyclic group, OR 39 (R 391 is a hydrogen atom, substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group, substituted or unsubstituted aryl group or substituted Or an unsubstituted heterocyclic group.) Or —O Ga—Q 391 (Q 392 ) (Q 391 and Q 392 are the same as Q 381 and Q 382. ) ) [0071] [Chemical 27]
- the rings A 4U1 and A ⁇ are substituted or unsubstituted aryl ring or bicyclic ring structures bonded to each other.
- substituents of the rings A4Cn and A4C > 2 forming the ligand of the above formula include chlorine, bromine, iodine, halogen atoms of fluorine, methyl group, ethyl group, Propyl group, butyl group, sec butyl group, tert butyl group, pentyl group, hexyl group, heptyl group, octyl group, stearyl group, trichloromethyl group and other substituted or unsubstituted alkyl groups, phenyl group, naphthyl group Group, 3-methylphenol group, 3-methoxyphenyl group, 3-fluorophenol group, 3-trichloromethylphenol group, 3-trifluoromethylphenol group, 3-to-diethyl ether Substituted or unsubstituted aryl groups such as -l group, methoxy group, n-butoxy group, tert butoxy group, t
- Mono- or di-substituted amino groups such as mino group, methylamino group, jetylamino group, ethylamino group, jetylamino group, dipropylamino group, dibutylamino group, diphenylamino group, bis (acetoxymethyl) amino group, bis (acetoxy) Ethyl) amino group, bisacetoxypropyl) amino group, bis (acetoxybutyl) amino group, etc., isylamino groups, hydroxyl groups, siloxy groups, acyl groups, strong rubamoyl groups, methylcarbamoyl groups, dimethylcarbamoyl groups, ethylcarbamoyl groups, Substituted or unsubstituted force rubamoyl groups such as a decylcarbamoyl group, a propylcarbamoyl group, a butylcarbamoyl group, a phenylcarb
- the reducing dopant is defined as a substance capable of reducing an electron transporting compound. Accordingly, various materials can be used as long as they have a certain reducibility, such as alkali metals, alkaline earth metals, rare earth metals, alkali metal oxides, alkali metal halides, alkaline earth metals.
- preferable reducing dopants include Na (work function: 2.36 eV), K (work function: 2.28 eV), Rb (work function: 2.16 eV) and Cs (work Function: 1. 95eV) Force at least one selected alkali metal, Ca (work function: 2.9 eV), Sr (work function: 2.0 to 2.5 eV), and Ba (work function: 2. 52 eV) Forces Group Forces Particularly preferred are those having a work function of 2.9 eV or less, including at least one selected alkaline earth metal. Of these, more preferred reducing dopants are K, Rb and Cs. At least one alkali metal selected, more preferably Rb or Cs, and most preferably Cs.
- alkali metals can improve emission brightness and extend the lifetime of organic EL devices by adding a relatively small amount to the electron injection region, which has a particularly high reducing ability.
- a combination of two or more alkali metals is also preferable.
- a combination containing Cs, for example, Cs and Na, Cs and K Cs and Rb or a combination of Cs, Na and ⁇ is preferable.
- an electron injection / transport layer made of an insulator or a semiconductor may be further provided between the cathode and the organic layer.
- an insulator at least one metal compound selected from the group consisting of alkali metal chalcogenides, alkaline earth metal chalcogenides, alkali metal halides and alkaline earth metal halides is used.
- the electron injecting / transporting layer is composed of these alkali metal chalcogenides or the like, it is preferable in that the electron injecting property can be further improved.
- preferred alkali metal chalcogenides include, for example, Li 0, LiO, Na S, Na Se and
- alkaline earth metal chalcogenides include, for example, Ca 0, BaO, SrO, BeO, BaS, and CaSe.
- Preferred alkali metal halides include, for example, LiF, NaF, KF, LiCl, KCl, and NaCl.
- Preferred alkaline earth metal halides include, for example, CaF, BaF
- Fluorides such as SrF, MgF and BeF, and halides other than fluoride
- the semiconductor constituting the electron injection 'transport layer includes at least one of Ba, Ca, Sr, Yb, Al, Ga, In, Li, Na, Cd, Mg, Si, Ta, Sb, and Zn.
- the inorganic compound constituting the electron injecting / transporting layer is preferably a microcrystalline or amorphous insulating thin film. If the electron injection / transport layer is made of these insulating thin films, Since a more uniform thin film is formed, pixel defects such as dark spots can be reduced. Examples of such inorganic compounds include the above-mentioned alkali metal chalcogenides, alkali earth metal chalcogenides, alkali metal halides and alkaline earth metal halides.
- the intermediate connection layer is a laminate of an acceptor layer, a Z donor layer, and a Z electron transport material layer, and is used to connect two light emitting layers.
- the acceptor is an easily reducible organic compound.
- the reduction potential using a saturated calomel (SCE) electrode as a reference electrode is preferably 0.8 V or more, more preferably 1 0.3 V or more, and particularly preferably tetracyanoquinodimethane (TCNQ).
- SCE saturated calomel
- TCNQ tetracyanoquinodimethane
- the acceptor is preferably an organic compound having an electron-withdrawing substituent or an electron-deficient ring.
- Examples of the electron-withdrawing substituent include halogen, CN—, carbo group, aryl group and the like.
- the acceptor is preferably an imide derivative such as a quinoid derivative, an arylborane derivative, a thiopyrandioxide derivative or a naphthalimide derivative, or a hexazatriphenylene diene derivative.
- an imide derivative such as a quinoid derivative, an arylborane derivative, a thiopyrandioxide derivative or a naphthalimide derivative, or a hexazatriphenylene diene derivative.
- the following compounds are preferable.
- R 49 to R 52 are each hydrogen, a fluoroalkyl group, an alkyl group, an aryl group, or a heterocyclic group, and R 5 ° and R 51 may form a ring.
- R 49 to R 52 are each hydrogen, a fluoroalkyl group, an alkyl group, an aryl group, or a heterocyclic group, and R 5 ° and R 51 may form a ring.
- R 49 to R 52 are each hydrogen, a fluoroalkyl group, an alkyl group, an aryl group, or a heterocyclic group, and R 5 ° and R 51 may form a ring.
- Ar 7 are each an aryl group (including a heterocyclic ring) having an electron withdrawing group.
- Ar 8 is an arylene group having an electron withdrawing group. S is 1 or 2 is there. )
- arylborane derivative include the following compounds.
- a compound having at least one fluorine as a substituent on the aryl such as tris j8- (pentafluoronaphthyl) borane (PNB).
- the imide derivative is preferably a naphthalene tetracarboxylic acid diimide compound or a pyromellitic acid diimide compound.
- Examples of the thiopyran dioxide derivative include a compound represented by the following formula (3a), and examples of the thioxanthene dioxide derivative include a compound represented by the following formula (3b). [Chemical 33]
- R 53 to R 64 are each hydrogen, halogen, fluoroalkyl group, cyano group, alkyl group or aryl group. Of these, hydrogen and cyano group are preferable.
- X represents the electron-absorbing I group and is the same as X in the formulas (la) to (: Li).
- the structure is (j), (k), or (1).
- halogen R 53 to R 64 represents, Furuoroarukiru group, an alkyl group and Ariru group is the same as 1 ⁇ ⁇ R 48.
- the electron withdrawing group X may be a substituent (X) or (y) represented by the following formula: .
- Ar 9 and Ar lc> are a substituted or unsubstituted heterocyclic ring, a substituted or unsubstituted aryloxycarbon or aldehyde, preferably pyridine, pyrazine, or quinoxaline.
- Ar 9 and Ar may be connected to each other to form a 5-membered or 6-membered cyclic structure.
- the hexazatriphenylene derivative is preferably a compound having a cyano group, particularly preferably a structure shown below.
- R b5 is a cyano group, an arylcarbonyl group, an alkoxycarbonyl group, a dialkyl group rubermoyl group, a diaryl group rubermoyl group, a halogen atom, a -ortho group, or a carboxyl group, respectively.
- the acceptor preferably has a thin film forming property. That is, the acceptor layer can be formed by vapor deposition.
- a thin film can be formed means that a flat thin film can be formed on a substrate by a general thin film forming method such as vacuum deposition or spin coating.
- flat means that the unevenness of the thin film is small, preferably the surface roughness (Ra) is lOnm or less, more preferably, the surface roughness (Ra) is 1.5 nm or less, Preferably, the surface roughness (Ra) is 1 nm or less.
- the surface roughness can be measured with an atomic force microscope (AFM).
- the organic compound having a thin film forming property is preferably an amorphous organic compound, more preferably an amorphous quinodimethane derivative, and further preferably amorphous and having 5 or more CN-groups. It is a quinodimethane derivative.
- (CN) -TCNQ above is a quinodimethane derivative.
- the content of Akuseputa contained in Akuseputa layer is preferably from 1 to 100 mole 0/0 for the entire layer, and more preferably 50 to: a LOO mol 0/0.
- the acceptor layer is capable of containing a hole-transporting and light-transmitting material, but is not necessarily limited thereto.
- the thickness of the acceptor layer is preferably 1 to 100 nm.
- the donor layer is a layer containing, as a donor, at least one selected from the group in which a donor metal, a donor metal compound, and a donor metal complex force are also selected.
- the donor metal means a metal having a work function of 3.8 eV or less, preferably an alkali metal, an alkaline earth metal and a rare earth metal, more preferably Cs, Li, Na, Sr, K, Mg, 0 which is Ca, Ba, Yb, Eu and Ce
- the donor metal compound is a compound containing the above donor metal, preferably a compound containing alkali metal, alkaline earth metal, or rare earth metal, and more preferably halogenated metal of these metals. It is porridge, oxide, carbonate, borate.
- MO M is a donor metal
- X is 0.5 to 1.5
- MF X is 1 to 3
- M (CO) x is 0.5 to 1.5).
- the donor metal complex is a complex of the above donor metal, and preferably an alkali metal, alkaline earth metal, or rare earth metal organometallic complex.
- Preferred is an organometallic complex represented by the following formula (I).
- M is a donor metal
- Q is a ligand, preferably a carboxylic acid derivative, a diketone derivative, or a quinoline derivative
- n is an integer of 1 to 4.
- the donor metal complex there is a tandasten turbine described in JP-A-2005-72012. Furthermore, phthalocyanine compounds whose central metals are alkali metals and alkaline earth metals described in JP-A-11-345687 can also be used as donor metal complexes.
- the above donors may be used alone or in combination of two or more.
- the content of the donor contained in the donor layer is preferably 1 to the entire layer: a LOO mol%, more preferably 50 to: a LOO mol 0/0.
- the donor layer can contain a single substance or a plurality of kinds of substances as long as it is a light-transmitting substance in addition to the donor.
- organic substances such as amine compounds, condensed ring compounds, nitrogen-containing cyclic compounds, metal complexes, and inorganic substances such as metal oxides, metal nitrides, metal fluorides, and carbonates. It is not limited to this.
- the thickness of the donor layer is preferably 1 to: LOOnm.
- a compound containing a non-complex nitrogen-containing heterocyclic structure is used for the electron transport material layer.
- a compound containing a nitrogen-containing 5-membered heterocyclic structure is preferred.
- a compound represented by the following formula (1) is preferable.
- ⁇ is a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 60 nuclear atoms, a substituted or unsubstituted heteroaryl group having 5 to 60 nuclear atoms, a substituted or unsubstituted group, respectively.
- a set of adjacent substituents of ⁇ to may be bonded to each other to form an aromatic ring or a heterocyclic ring.
- R 9 to R 2 ° are each a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 60 nuclear atoms, a substituted or unsubstituted heteroaryl group having 5 to 60 nuclear atoms, substituted or unsubstituted, An unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 nuclear atoms, a substituted or unsubstituted carbon number 1 ⁇ 50 alkoxy group, substituted or unsubstituted aryloxy group having 5 to 50 carbon atoms, substituted or unsubstituted aryloxy group having 5 to 50 nucleus atoms, substituted or unsubstituted carbon atoms 1 to 50 An alkoxycarbonyl group, an amino group substituted with a substituted with a
- Ar 1 is a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, a substituted or unsubstituted pyridylene group, or a substituted or unsubstituted quinolylene group,
- Ar 2 is a hydrogen atom, a substituted or unsubstituted aryl group having 5 to 60 nuclear atoms, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted carbon number of 1 to 50.
- R la to R 5c , L to L, Ar la to Ar 2c are R 9 to R 2 ° in the above formula (2), L ac
- L to L and Ar la to Ar le are preferably substituted or unsubstituted phenylene groups, substituted ac
- an unsubstituted bibutylene group a substituted or unsubstituted naphthylene group, a substituted or unsubstituted anthracene group, or a substituted or unsubstituted pyridylene group. More preferred are a phenylene group, a phenylene group substituted with a methyl group, a biphenylene group, a naphthylene group, or an anthracenylene group.
- Ar 2a to Ar 2e are preferably substituted or unsubstituted phenyl group, substituted or unsubstituted biphenyl group, substituted or unsubstituted terphenyl group, substituted or unsubstituted naphthyl group, substituted or unsubstituted A substituted aryl group having 6 to 20 carbon atoms. More preferred are a phenyl group, a phenyl group substituted with a methyl group, a biphenyl group, a turfyl group, a naphthyl group, and a phenyl group substituted with a naphthyl group.
- R la and R le are preferably a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms. More preferred are a methyl group, an ethyl group, a propyl group, a butyl group, a phenyl group, a phenyl group substituted with a methyl group, a biphenyl group, and a naphthyl group.
- R 2b and R 2e are preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms. More preferred are a methyl group, an ethyl group, a propyl group, a butyl group, a phenyl group, a phenyl group substituted with a methyl group, a biphenyl group, and a naphthyl group.
- R 3a to R 6a , R 3b to R 6b , R 3e to R 6e are preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 20 carbon atoms.
- Group, cyan group More preferred are a hydrogen atom, a methyl group, a phenol group, a biphenyl group, a naphthyl group, a cyano group, and a trifluoromethyl group.
- the thickness of the electron transporting material layer is preferably 0.1 to LOONm.
- the intermediate connection layer of the present invention is a laminate of at least one acceptor layer, Z donor layer, Z electron transport material layer, and other intermediate connection layers are known intermediate connection layers. It may be.
- materials constituting such an intermediate connection layer include oxides and nitrides of metals such as In, Sn, Zn, Ti, Zr, Hf, V, Mo, Cu, Ga, Sr, La, and Ru. , Iodide, fluoride and the like.
- the multi-component metal compound which consists of multiple types of these metals can be mentioned.
- Transparent conductive materials such as SrCu 2 O, LaB, and RuO can be used. Among these, I
- Conductive metal oxides such as TO, IZO, SnO, ZnO, TiO, VO, MoO, and RuO are preferably used.
- a film containing a low refractive index material and the transparent conductive material can be used as the intermediate connection layer.
- Low refractive index materials include metal oxides (SiO, etc.) and metal fluorides (NaF, LiF, CaF, Na A1F, A1F, MgF, ThF, LaF x 2 3 6 3 2 4
- Organic compounds such as inorganic compounds that are metal halides such as
- the organic EL device material and the organic EL device of the present invention will be described in detail based on examples, but the present invention is not limited to the following examples unless it exceeds the gist thereof.
- the EL spectrum when a current density of 1 OmAZcm 2 was applied was measured with a spectral radiance meter CS 1000A (manufactured by Koryo Minolta), and the luminous efficiency (unit: cd / A) was calculated.
- a film of ITO was formed to a thickness of 130 nm on a 0.7 mm thick glass substrate by sputtering. This substrate was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, followed by UV ozone cleaning for 30 minutes, and then the substrate with the ITO electrode was mounted on the substrate holder of the vacuum deposition apparatus.
- Ac 1 was previously used as the material for the hole injection layer of the first organic light emitting layer and the material for the acceptor layer of the intermediate connection layer, and the holes of the first and second organic light emitting layers were previously placed on each molybdenum heating boat.
- HT1 as the material of the transport layer
- BH as the host material of the organic light emitting medium layer of the first and second organic light emitting layers
- BD1 as the blue light emitting material
- the electron transport material layer of the intermediate connection layer and the second organic light emitting layer ET1 was attached as the electron transport layer
- LiF as the electron injection layer of the intermediate connection layer and the second organic light emitting layer
- A1 as the cathode material.
- an Acl film functioning as a hole injection layer of the first organic light emitting layer was formed to a thickness of 40 nm
- an HTl film functioning as a hole transport layer is formed to a thickness of 40 nm
- the organic light emitting medium layer of the first organic light emitting layer is formed so that the ratio of compound BH and compound BD1 is 40: 2.
- Co-deposited with a film thickness of 40 nm On this film, an ET1 film is deposited as an electron transport material layer of an intermediate connection layer with a thickness of 20 nm, a LiF film is deposited as a donor layer with a thickness of 1 nm, and then an Ac1 film is deposited as an acceptor layer.
- the film was formed at 40 nm.
- an HT1 film functioning as a hole transport layer of the second organic light-emitting layer is formed with a film thickness of 40 nm, and as the organic light-emitting medium layer of the second organic light-emitting layer, compound BH and compound BD1 Were co-deposited with a film thickness of 40 nm so that the ratio was 40: 2.
- an ET1 film functioning as an electron transport layer of the second organic light-emitting layer was formed with a film thickness of 20 nm, and a LiF film was formed as an electron injection layer with a film thickness of 1 nm.
- this film An A1 film functioning as a cathode was deposited on the film with a thickness of 150 nm to obtain an organic EL device. The obtained organic light emitting device was evaluated. The results are shown in Table 2.
- Example 1 except that ET2 was used instead of ET1 as the electron transport material layer of the intermediate connection layer and the electron transport layer of the second organic light emitting layer, the organic EL was made in the same manner as in Example 1. An element was produced.
- Example 1 except that ET3 was used instead of ET1 as the electron transport material layer of the intermediate connection layer and the electron transport layer of the second organic light emitting layer, the organic EL was made in the same manner as in Example 1. An element was produced.
- Example 1 an organic EL device was prepared in the same manner as in Example 1 except that ET4 was used instead of ET1 as the electron transport material layer of the intermediate connection layer and the electron transport layer of the second organic light emitting layer. was made.
- Example 1 except that Alq was used instead of ET1 as the electron transport material layer of the intermediate connection layer and the electron transport layer of the second organic light emitting layer, the organic EL was made in the same manner as in Example 1. An element was produced.
- Example 5 Anode Z 1st organic light emitting layer Z intermediate connection layer Z 2nd organic light emitting layer Z As the configuration of the Z cathode, an organic EL device having the following device configuration was fabricated.
- a film of ITO was formed to a thickness of 130 nm by sputtering on a 0.7 mm thick glass substrate. This substrate was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, followed by UV ozone cleaning for 30 minutes, and then the substrate with the ITO electrode was mounted on the substrate holder of the vacuum deposition apparatus.
- Ac2 is used as the material for the hole injection layer of the first organic light emitting layer and the material for the acceptor layer of the intermediate connection layer, and the holes are transported to the first and second organic light emitting layers.
- HT1 and HT2 as the material of the layer
- BH as the host material of the organic light emitting medium layer of the first and second organic light emitting layers
- BD2 as the blue light emitting material
- the electron transport material layer and the second organic light emitting material of the intermediate connection layer ET1 as the electron transport layer of the layer
- LiF as the electron injection layer of the intermediate connection layer and the second organic light emitting layer
- A1 as the cathode material
- an Ac2 film functioning as a hole injection layer of the first organic light emitting layer is formed with a film thickness lOnm, and then an HT2 / HT1 multilayer film functioning as a hole transport layer is formed with a film thickness of 50 nm / 20 nm. Then, as an organic light-emitting medium layer of the first organic light-emitting layer, compound BH and compound BD2 were co-deposited at a film thickness of 40 nm so as to have a ratio of 40: 2.
- an ET1 film is deposited with a thickness of 20 nm as an electron transport material layer for the intermediate connection layer
- a LiF film is deposited with a thickness of lnm as a donor layer
- an Ac2 film is deposited as an acceptor layer with a thickness of lOnm.
- the film was formed.
- an HT2 / HT1 multilayer film functioning as a hole transport layer of the second organic light-emitting layer is formed with a film thickness of 50 nm and Z20 nm, and the compound BH is formed as the organic light-emitting medium layer of the second organic light-emitting layer.
- Compound B D2 were co-deposited at a film thickness of 40 nm to a ratio of 40: 2. Further, on this film, an ET1 film functioning as an electron transport layer of the second organic light-emitting layer is formed with a film thickness of 20 nm, and a LiF film is formed as an electron injection layer with a film thickness of lnm. An A1 film functioning as a cathode was formed on the film with a film thickness of 150 nm to obtain an organic EL device. [0120] Comparative Example 2
- Example 5 except that Alq was used instead of ET1 as the electron transport material layer of the intermediate connection layer and the electron transport layer of the second organic light-emitting layer, the organic EL was made in the same manner as in Example 1. An element was produced.
- the organic EL element of the present invention can be used as a material for various colors of organic EL, including blue, and can be applied to various display elements, displays, knock lights, illumination light sources, signs, signs, interiors, and the like. Particularly, it is suitable as a display element for a color display.
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Abstract
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EP07742799A EP2018090A4 (en) | 2006-05-11 | 2007-05-02 | ORGANIC ELECTROLUMINESCENCE DEVICE |
JP2008515489A JP5432523B2 (ja) | 2006-05-11 | 2007-05-02 | 有機エレクトロルミネッセンス素子 |
KR1020087027475A KR101384046B1 (ko) | 2006-05-11 | 2007-05-02 | 유기 전계발광 소자 |
US12/300,345 US8076839B2 (en) | 2006-05-11 | 2007-05-02 | Organic electroluminescence device |
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Also Published As
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CN101444142A (zh) | 2009-05-27 |
JP5432523B2 (ja) | 2014-03-05 |
EP2018090A4 (en) | 2010-12-01 |
EP2018090A1 (en) | 2009-01-21 |
KR20090013783A (ko) | 2009-02-05 |
KR101384046B1 (ko) | 2014-04-09 |
TW200808116A (en) | 2008-02-01 |
US8076839B2 (en) | 2011-12-13 |
US20090179554A1 (en) | 2009-07-16 |
JPWO2007132678A1 (ja) | 2009-09-24 |
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