WO2005083033A1 - 有機エレクトロルミネッセンス素子材料、有機エレクトロルミネッセンス素子、表示装置及び照明装置 - Google Patents
有機エレクトロルミネッセンス素子材料、有機エレクトロルミネッセンス素子、表示装置及び照明装置 Download PDFInfo
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- WO2005083033A1 WO2005083033A1 PCT/JP2005/002317 JP2005002317W WO2005083033A1 WO 2005083033 A1 WO2005083033 A1 WO 2005083033A1 JP 2005002317 W JP2005002317 W JP 2005002317W WO 2005083033 A1 WO2005083033 A1 WO 2005083033A1
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- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001184 polypeptide Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- LNKHTYQPVMAJSF-UHFFFAOYSA-N pyranthrene Chemical group C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC3=C(C=CC=C4)C4=CC4=CC=C1C2=C34 LNKHTYQPVMAJSF-UHFFFAOYSA-N 0.000 description 1
- JEXVQSWXXUJEMA-UHFFFAOYSA-N pyrazol-3-one Chemical class O=C1C=CN=N1 JEXVQSWXXUJEMA-UHFFFAOYSA-N 0.000 description 1
- 150000003219 pyrazolines Chemical class 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 125000000719 pyrrolidinyl group Chemical group 0.000 description 1
- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- WVIICGIFSIBFOG-UHFFFAOYSA-N pyrylium Chemical compound C1=CC=[O+]C=C1 WVIICGIFSIBFOG-UHFFFAOYSA-N 0.000 description 1
- DLJHXMRDIWMMGO-UHFFFAOYSA-N quinolin-8-ol;zinc Chemical compound [Zn].C1=CN=C2C(O)=CC=CC2=C1.C1=CN=C2C(O)=CC=CC2=C1 DLJHXMRDIWMMGO-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229940042055 systemic antimycotics triazole derivative Drugs 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000003419 tautomerization reaction Methods 0.000 description 1
- 150000003536 tetrazoles Chemical group 0.000 description 1
- 150000004867 thiadiazoles Chemical class 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 150000003577 thiophenes Chemical class 0.000 description 1
- JFLKFZNIIQFQBS-FNCQTZNRSA-N trans,trans-1,4-Diphenyl-1,3-butadiene Chemical group C=1C=CC=CC=1\C=C\C=C\C1=CC=CC=C1 JFLKFZNIIQFQBS-FNCQTZNRSA-N 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 1
- 125000005259 triarylamine group Chemical group 0.000 description 1
- 150000004654 triazenes Chemical class 0.000 description 1
- 125000002889 tridecyl 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])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000000025 triisopropylsilyl group Chemical group C(C)(C)[Si](C(C)C)(C(C)C)* 0.000 description 1
- 125000003258 trimethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 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
- 125000005580 triphenylene group Chemical group 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
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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- H10K85/346—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising platinum
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- C—CHEMISTRY; METALLURGY
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- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
- C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
- H10K85/322—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising boron
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
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- C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/18—Metal complexes
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- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
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- H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
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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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- H10K85/656—Aromatic compounds comprising a hetero atom comprising two or more different heteroatoms per ring
- H10K85/6565—Oxadiazole compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/917—Electroluminescent
Definitions
- Organic electroluminescent device organic electroluminescent device
- the present invention relates to a material for an organic electroluminescent device, a device for an organic electroluminescent device, a display device, and a lighting device.
- ELD electroluminescent display
- examples of ELD components include an inorganic electroluminescent device and an organic electroluminescent device (hereinafter, referred to as an organic EL device).
- Inorganic electroluminescent devices have been used as flat light sources, but high voltage AC is required to drive the light emitting devices.
- An organic EL device has a configuration in which a light-emitting layer containing a compound that emits light is sandwiched between a cathode and an anode. Electrons and holes are injected into the light-emitting layer and recombined to generate excitons (excitons).
- an element having an organic light-emitting layer obtained by using an 8-hydroxyquinoline aluminum complex as a host conjugate and adding a small amount of a phosphor thereto for example, JP-A-63-264692
- a device having an organic light emitting layer in which a quinoline aluminum complex is used as a host conjugate and doped with a quinacridone dye for example, JP-A-3-255190
- the upper limit of the internal quantum efficiency is 100%, so that the luminous efficiency is twice as high as that of the excited singlet, and performance almost equivalent to that of a cold cathode tube is not obtained. Because of the possibility that it may be used, it is attracting attention as a lighting application.
- the light emission luminance and the light emission efficiency of the light emitting element are greatly improved as compared with the conventional element because the emitted light is derived from phosphorescence. There is a problem that the light lifetime is shorter than that of the conventional device.
- Non-Patent Document 2 there is a report that white light is realized by coexisting monomer emission and excimer emission by utilizing the planarity of a platinum complex.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-332291
- Patent Document 2 JP-A-2002-332292
- Patent Document 3 JP-A-2002-338588
- Patent Document 4 JP 2002-226495 A
- Patent Document 5 Japanese Patent Application Laid-Open No. 2002-234894
- Non-Patent Document 1 Inorganic Chemistry, Vol. 41, No. 12, pp. 3055-3066 (2002)
- Non-Patent Document 2 Advanced Materials., Vol. 14, p. 1032 (2002) Disclosure of the Invention
- An object of the present invention is to provide an organic EL device having a high luminous efficiency and a long luminous life.
- a lighting device and a display device are provided.
- One embodiment of the present invention is characterized by comprising a platinum complex formed by a platinum ion and a ligand having at least one aryl group which cannot rotate freely or an aromatic heterocyclic group which cannot rotate freely.
- Organic electroluminescent device materials are characterized by comprising a platinum complex formed by a platinum ion and a ligand having at least one aryl group which cannot rotate freely or an aromatic heterocyclic group which cannot rotate freely.
- FIG. 1 is a schematic diagram showing an example of a display device configured with an organic EL element.
- FIG. 2 is a schematic diagram of a display unit A.
- FIG. 3 is an equivalent circuit diagram of a drive circuit forming a pixel.
- FIG. 4 is a schematic view of a display device using a passive matrix system.
- FIG. 5 is a schematic diagram of a sealing structure of an organic EL element OLED1-1.
- FIG. 6 is a schematic view of a lighting device including an organic EL element.
- An organic electroluminescent device material comprising a platinum complex formed from a ligand having at least one aryl group that cannot rotate freely or an aromatic heterocyclic group that cannot rotate freely and a platinum ion.
- R and R each represent a hydrogen atom or a substituent. However, at least R, R, R
- X and X each represent a carbon atom, a nitrogen atom, an oxygen atom,
- nl represents an integer of 1 or 2
- L1 represents a bidentate ligand.
- pl and ql each represent an integer of 0-4.
- R and R each represent a hydrogen atom or a substituent. However, at least R, R, R
- n2 is an integer of 1 or 2
- L2 represents a bidentate ligand.
- p2 and q2 each represent an integer of 0-4.
- Luminescent element material is a platinum complex represented by the following general formula (3) or a tautomer of the general formula (3).
- R and R each represent a hydrogen atom or a substituent.
- Z is an aromatic hydrocarbon ring or
- n3 is an integer of 1 or 2, and when n3 is 1, L3 represents a bidentate ligand.
- p3 is an integer from 0-3, and q3 is an integer from 0-4.
- R and R each represent a hydrogen atom or a substituent.
- R is a hydrogen atom or Or a substituent.
- n4 is an integer of 1 or 2, and when n4 is 1, L4 represents a bidentate ligand.
- p4 represents an integer of 0-3, and q4 represents an integer of 0-4.
- R 1 and R 2 each represent a hydrogen atom or a substituent.
- Z is an aromatic hydrocarbon ring
- n5 is an integer of 1 or 2, and when n5 is 1, L5 represents a bidentate ligand.
- p5 is an integer from 0-4, and q5 is an integer from 0-3.
- R 1 and R 2 each represent a hydrogen atom or a substituent.
- R is each hydrogen source
- n6 is an integer of 1 or 2, and when n6 is 1, L6 represents a bidentate ligand.
- p6 represents an integer of 0-3, and p7 represents an integer of 0-4.
- R 1 and R each represent a hydrogen atom or a substituent.
- Z is both nitrogen atom
- n7 is an integer of 1 or 2, and when n7 is 1, L7 represents a bidentate ligand.
- p8 represents an integer of 0-3, and q6 represents an integer of 0-4.
- R 1 and R 2 each represent a hydrogen atom or a substituent.
- Z is both nitrogen atom
- n8 is an integer of 1 or 2
- L8 represents a bidentate ligand
- p9 represents an integer of 0-3, and q7 represents an integer of 0-4.
- R 1 and R 2 each represent a hydrogen atom or a substituent. At least one of R and R
- L represents a divalent linking group.
- X and X are each a carbon atom and a nitrogen atom
- n9 is an integer of 1 or 2
- L9 represents a bidentate ligand
- plO and q8 each represent an integer of 0-4.
- the aryl group that cannot rotate freely is an aryl group having a substituent A
- the aromatic heterocyclic group that cannot rotate freely is an aromatic heterocyclic group having a substituent B.
- An organic electroluminescent device comprising the organic electroluminescent device according to any one of (1) to (13).
- An organic electroluminescent device having a light-emitting layer as a constituent layer, wherein the light-emitting layer contains the organic electroluminescent device material described in (1) above.
- a luminescence element
- R, R, R, and R each represent a hydrogen atom or a substituent.
- nl, n2, n3, n4 are
- Ar and Ar represent an arylene group or a divalent aromatic heterocyclic group.
- L represents a divalent linking group.
- R—R each represent a hydrogen atom or a substituent. However, at least R
- n5 to n8 each represent an integer of 0 to 4.
- the light emitting layer contains a carboline derivative or a derivative having a ring structure in which at least one of carbon atoms of a hydrocarbon ring constituting a carboline ring of the carboline derivative is substituted with a nitrogen atom.
- the organic electroluminescent device according to any one of the above (15) to (17).
- the organic elect as described in any one of (15) to (19) above, further comprising a hole blocking layer as a constituent layer, wherein the hole blocking layer contains a boron derivative. Mouth luminescence element.
- a display device comprising the organic electroluminescent device according to any one of (1) to (21).
- the organic EL device having the configuration described in any one of the above (14) and (21) has a long luminous life while exhibiting a high luminous efficiency characteristic of the conventional platinum complex. I helped to improve. Further, by using the organic EL device of the present invention, a display device according to claim 22 and a lighting device according to (23) can be obtained.
- the present inventors have conducted intensive studies in view of the above problems, and as a result, have found that aryl groups that cannot rotate freely or that cannot rotate freely! / ⁇ a ligand having at least one aromatic heterocyclic group
- the use of an organic EL device containing a platinum complex formed with a platinum complex and a platinum ion makes it a problem of the conventional organic EL device manufactured using an organic EL device material containing a platinum complex. Has been found to be significantly improved.
- an orthometallic complex is preferably used, and particularly preferably, an orthometallated compound represented by the general formula (1) or the general formula (9) is used. Complex.
- the layer containing the platinum complex in the device a light emitting layer and Z or a hole blocking layer are preferable, and when the platinum complex is contained in the light emitting layer, it is used as a light emitting dopant in the light emitting layer.
- the effect described in the present invention that is, a longer luminescent lifetime of the organic EL element, was achieved.
- the planarity force inherently possessed The above planarity is hindered by the steric hindrance of the above-mentioned unrotatable or aryl group or a ligand having at least one aromatic heterocyclic group which cannot be freely rotated. It is presumed that the formation of is suppressed.
- the platinum complex according to the present invention is formed from a ligand that cannot rotate freely! /, An aryl group or cannot rotate freely! /, And a ligand that has at least one aromatic heterocyclic group and a platinum ion.
- the “aryl group that cannot rotate freely and the aromatic heterocyclic group that cannot rotate freely” represent a substituent that cannot rotate freely due to steric hindrance.
- the state that free rotation is not possible! Is in a state where the aryl group and the aromatic heterocyclic group are close to other substituents arranged around the aryl group and the aromatic heterocyclic group. Naturally, it is naturally impossible to rotate freely.
- the bond is formed through the bond axis of the aryl group or the bond axis of the aromatic heterocyclic group, and the bond rotation barrier derived from the conformational energy with the substituent is generated.
- the conformational energy for generating the bond rotation barrier is preferably 10 ° JZ mol or more.
- an aryl group and an aromatic heterocyclic group are preferred.
- Examples of an aryl group that can be used as an aryl group that cannot rotate freely include, for example,
- a phenyl group a tolyl group, a xylyl group, a biphenyl group, a naphthyl group, an anthryl group and a phenanthryl group.
- Examples of the aromatic heterocyclic group that can be used as an aromatic heterocyclic group that cannot rotate freely include, for example, a furyl group, a phenyl group, a pyridyl group, a pyridazinyl group, a pyrimidinyl group, a pyrazinyl group, and a triazinyl group.
- a furyl group for example, a furyl group, a phenyl group, a pyridyl group, a pyridazinyl group, a pyrimidinyl group, a pyrazinyl group, and a triazinyl group.
- the "freely rotatable! /, Aryl group, non-rotatable aromatic heterocyclic group” is preferably a substituted aryl group or a substituted aromatic heterocyclic group, respectively.
- exemplified compound (A) is an unsubstituted phenyl group
- exemplified compound (B) is a phenyl group in which two methyl groups are substituted
- VDW van der Ruwarusu
- VDW van der Waals
- the aryl group which cannot be freely rotated and the aromatic heterocyclic group which cannot be freely rotated according to the present invention are platinum as described above. Based on the configuration of the ion ligand, the aryl group and the aromatic heterocyclic group may be unsubstituted or have a substituent, as long as each of the aryl group and the aromatic heterocyclic group can have a configuration that cannot rotate freely.
- the substituent A and the substituent B are preferably each electron-donating.
- "having an electron donating property” means that the Hammett's ⁇ ⁇ value described below shows a negative value, and such a substituent has a larger bond than a hydrogen atom. Easy to give electrons to the atom side.
- substituent having an electron donating property examples include a hydroxyl group, a methoxy group, an acetyloxy group, an amino group, a dimethylamino group, an acetylamino group, an alkyl group (for example, a methyl group, an ethyl group, a propyl group, a tert group) —Butyl group etc.) and aryl groups (eg phenyl group etc.).
- alkyl group for example, a methyl group, an ethyl group, a propyl group, a tert group
- aryl groups eg phenyl group etc.
- the Hammett's ⁇ ⁇ value according to the present invention refers to Hammett's substituent constant ⁇ ⁇ . No, Met's ⁇ ⁇ Is the substituent constant for which the electronic effect of the substituent on the hydrolysis of ethyl benzoate was determined by Hammett et al., And is shown in “Structural Activity Relationship of Drugs” (Nankodo: 1979), “SuDstituent Constants for Correlation”. Analysis chemistry and biology "(C. Hansch and A. Leo, John Wiley & Sons, New York, 1979) and the like can be cited.
- an orthometallic complex is preferably used, and more preferably, the platinum complex described in any of formulas (1) and (9) above is mentioned.
- the orthometallization complex according to the present invention is described, for example, in “Organometallic Chemistry-Fundamentals and Applications-” pl50, 232, Shokabosha, Ltd., written by Akio Yamamoto, 1982, “Photochemistry and Photophysics of Coordination”, p7. ⁇ ⁇ p / 7, pl35—pl4o Springer—Veriag, H. Yersin, published in 1987, etc., is a generic term for a group of compounds.
- the metal complex is formed by cleavage of a bond such as a C—H bond or an N—H bond at an ortho position of an aryl group or an aromatic heterocyclic group. Platinum is used as the central metal of the metal complex.
- the platinum complex according to any one of the general formulas (1) and (9) has an aryl group that cannot rotate freely or an aromatic heterocyclic group that cannot rotate freely at any position of the ligand. Is the feature.
- the organic EL device of the present invention which is produced using an organic EL device material containing a platinum complex having such physical properties, exhibits a high luminous brightness and emits light, unlike the related art. A longer life can be achieved at the same time.
- Groups eg, methyl group, ethyl group, isopropyl group, hydroxyethyl group, methoxymethyl group, trifluoromethyl group, t-butyl group, etc.
- cycloalkyl groups eg, cyclopentyl group, cyclohexyl group, etc.
- Aralkyl group for example, benzyl group, 2- phenethyl group, etc.
- Aryl groups e.g., phenyl, p-chlorophenol, mesityl, tolyl, xylyl, biphenyl, naphthyl, anthryl, phenanthryl, etc.
- Ring group for example, furyl group, phenyl group, pyridinyl group, pyridazinyl group, pyrimidinyl group, pyrazinyl group, triazinyl group, imidazolyl group, pyrazolyl group, thiazolyl
- examples of the aromatic hydrocarbon ring or aromatic hetero ring formed by Z include a benzene ring, a naphthalene ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a virazine ring, and a triazine ring.
- a benzene ring is preferable.
- Examples thereof include a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, a benzimidazole ring, a benzothiazole ring, a benzoxazole ring, a quinazoline ring, and a phthalazine ring.
- a pyridine ring is preferable.
- nl is an integer of 1 or 2, and when nl is 1, L1 represents a bidentate ligand.
- the bidentate ligand represented by L1 include oxycarboxylic acid, oxyaldehyde and derivatives thereof (eg, salicylaldehyde, oxyacetophenonate, etc.), dioxy compounds (eg, biphenolato, etc.), diketones (For example, acetylacetonato, dibenzoylmethanato, cetinolemaronato, ethilacetoacetat, etc.), oxyquinones (for example, pyromeconato, oxynaphthoquinonato, oxianthraquinonato, etc.), trobolones (E.g., trobonato, hinokitiolato, etc.), N-oxide conjugates, aminocarboxylic acids and analogous compounds (e.g., glycinato, aran
- Ra—Rv represents an alkyl group (for example, a methyl group, an ethyl group, an isopropyl group, a hydroxyethyl group, a methoxymethyl group, a trifluoromethyl group).
- a methyl group, a t-butyl group, etc.) or a halogenated alkyl group for example, those in which at least one hydrogen atom of the alkyl group is substituted with a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, etc.
- Am-Arc represents an aryl group (for example, a phenyl group, a p-chlorophenyl group, a mesityl group, a tolyl group, a xylyl group, a biphenyl group).
- -Aryl group naphthyl group, anthryl group, phenanthryl group, etc.
- an aromatic heterocyclic group e.g., furyl group, chenyl group, pyridyl group, pyridazinyl group, pyrimidinyl group, pyrazur group, triazyl group, imidazolyl group, Pyrazolyl group, thiazolyl group, quinazolinyl group, carbazolyl group, carbonyl group, phthalazinyl group, etc.
- the bidentate ligand represented by L2 has the same meaning as the bidentate ligand represented by L1 in the general formula (1).
- the bidentate ligand represented by L3 has the same meaning as the bidentate ligand represented by L1 in the general formula (1).
- Benzene ring biphenyl ring, naphthalene ring, azulene ring, anthracene ring, phenanthrene ring, pyrene ring, thalicene ring, naphthacene ring, triphenylene ring, o terphenyl ring, m-terphenyl ring, p Examples include a terphenyl ring, an acenaphthene ring, a coronene ring, a fluorene ring, a fluoranthrene ring, a naphthacene ring, a pentacene ring, a perylene ring, a pentaphene ring, a picene ring, a pyrene ring, a pyranthrene ring, and an anthranthrene ring.
- the aromatic hydrocarbon ring may have a substituent represented by R or R in the general formula (1).
- the aromatic heterocyclic ring may have a substituent represented by each of R and R in the general formula (1).
- the bidentate ligand represented by L4 has the same meaning as the bidentate ligand represented by L1 in the general formula (1).
- the bidentate ligand represented by L5 has the same meaning as the bidentate ligand represented by L1 in the general formula (1).
- the bidentate ligand represented by L6 has the same meaning as the bidentate ligand represented by L1 in the general formula (1).
- the bidentate ligand represented by L7 has the same meaning as the bidentate ligand represented by L1 in the general formula (1).
- the aromatic heterocyclic ring may have a substituent represented by R or R in the general formula (1).
- the bidentate ligand represented by L8 has the same meaning as the bidentate ligand represented by L1 in the general formula (1).
- Gin ring, pyridazine ring, pyrimidine ring, pyrazine ring, triazine ring, benzimidazole ring, oxadiazole ring, triazole ring, imidazole ring, pyrazole ring, thiazole ring, indole ring, benzimidazole ring, benzothiazole ring, benzoxazole ring examples include a ring in which at least one of carbon atoms of a hydrocarbon ring constituting a quinoxaline ring, a quinazoline ring, a phthalazine ring, a carbazole ring, a carbolin ring, and a carbolin ring is further substituted with a nitrogen atom.
- the aromatic heterocyclic ring may have a substituent represented by R or R in the general formula (1).
- the bidentate ligand represented by L9 has the same meaning as the bidentate ligand represented by L1 in the general formula (1).
- the 5- or 6-membered ring formed by Z has the same meaning as the 5- or 6-membered ring formed by Z in the general formula (1).
- the divalent linking group represented by L includes an alkylene group (for example,
- cyclohexylene group eg, 1,6-cyclohexanediyl group, etc.
- cyclobenzylene group eg, 1,5-cyclopen
- Each of the ortho-metallated complexes represented by (9) (also referred to as an ortho-metal lantern platinum complex!) Is a so-called metal complex comprising a central metal platinum (Pt) and a ligand,
- Pt central metal platinum
- ligand portion of the metal complex can be synthesized with reference to, for example, Organic Letter Magazine, vol. 3, No. 16, p2579-2581 (2001) and the like.
- the metal complex with Pt (metal ion) can be synthesized by applying the methods described in the above-mentioned references and Non-Patent Document 1.
- the organic EL device When an organic EL device is produced using the organic EL device material of the present invention, it is preferable to use the organic EL device as a light emitting layer or a hole blocking layer among constituent layers of the organic EL device (details will be described later).
- the light emitting layer As described above, it is preferably used as a light emitting dopant.
- the mixing ratio of the light-emitting dopant to the light-emitting host, which is the main component in the light-emitting layer, is preferably adjusted to a range of 0.1% by mass to less than 30% by mass.
- the light emitting dopant may be a mixture of a plurality of types of compounds.
- the mixing partner may have a different structure, or may be a phosphorescent dopant or a fluorescent dopant having another metal complex or another structure.
- dopants phosphorescent dopants, fluorescent dopants, and the like
- platinum complex used as the luminescent dopant
- the light emitting dopant is roughly classified into two types, a fluorescent dopant that emits fluorescence and a phosphorescent dopant that emits phosphorescence.
- fluorescent dopant examples include coumarin dyes, pyran dyes, cyanine dyes, croconium dyes, squarium dyes, oxobenzanthracene dyes, fluorescein dyes, and rhodamines. Dyes, pyrylium dyes, perylene dyes, styrven dyes, polythione dyes, and rare earth complex fluorescent materials.
- a typical example of the latter (phosphorescent dopant) is preferably a complex compound containing a metal belonging to Groups 8, 9, or 10 of the periodic table of elements, and more preferably an iridium compound or an iridium compound. Sumidium compounds are the most preferred, and iridium compounds are the most preferred. [0142] Specific examples are compounds described in the following patent publications.
- a light-emitting host (also referred to simply as a host!) Means a compound having the highest mixing ratio (mass) in a light-emitting layer composed of two or more compounds, and the other compounds are referred to as “do”.
- One panto compound also simply referred to as a dopant
- the light-emitting layer is formed by the compound A, the compound B, If the three kinds of power of the compound C are also formed and the mixing ratio is 8: 10: 5: 10: 85, the compound A and the compound B are dopant compounds, and the compound C is a host conjugate.
- the luminescent host used in the present invention a compound having a shorter wavelength than the phosphorescent 0-0 band of the luminescent dopant used in combination is preferable, and the luminescent dopant is preferably the phosphorescent 0-0 band.
- the emission host preferably has a phosphorescent 0-0 band power of 50 nm or less.
- the luminescent host of the present invention is not particularly limited in structure, but is typically a carbazole derivative, a triarylamine derivative, an aromatic borane derivative, a nitrogen-containing heterocyclic compound, a thiophene derivative, A compound having a basic skeleton such as a furan derivative or an oligoarylene compound and having the 0-0 band of 450 nm or less is a preferable compound.
- the luminescent host of the present invention may be a low-molecular compound, a high-molecular compound having a repeating unit, or a low-molecular compound having a polymerizable group such as a vinyl group or an epoxy group (evaporation-polymerizable luminescent host). Good.
- the light-emitting host a compound that has a hole-transporting ability and an electron-transporting ability, prevents a longer emission wavelength, and has a high Tg (glass transition temperature) is preferable.
- the platinum complex according to the present invention or an orthometallic complex is preferably used as the platinum complex, but in addition to these, the above-mentioned known light-emitting host or light-emitting dopant may be used in combination. Good.
- the light emitting layer is represented by the general formula (10) or the general formula (11). It preferably contains the compound represented. These compounds are preferably used as a light emitting host in the light emitting layer.
- -Aryl groups eg, vinyl group, aryl group, etc.
- alkynyl groups eg, ethur group, propargyl group, etc.
- aryl groups eg, furyl group, naphthyl group, etc.
- aromatic heterocyclic groups eg, , Furyl, chenyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl Group, triazinyl group, imidazolyl group, pyrazolyl group, thiazolyl group, quinazolinyl group, phthalazyl group, etc.
- heterocyclic group for example, pyrrolidyl group, imidazolidyl group, morpholyl group
- Oxazolidyl group, etc. alkoxyl group (for example, methoxy group, ethoxy group, propyloxy group, pentyloxy group, hexyloxy group, octyloxy group, dodecyloxy group, etc.), cycloalkoxyl group (for example, cyclopentyloxy group, cyclohexyloxy group) Group), aryloxy group (eg, phenoxy group, naphthyloxy group, etc.), alkylthio group (eg, methylthio group, ethylthio group, propylthio group, pentylthio group, hexylthio group, octylthio group, dodecylthio group, etc.), cycloalkylthio group Group (for example, cyclopentylthio group, cyclohexylthio group, etc.), arylthio group (for example, phenylthio group
- substituents may be further substituted by the above substituents.
- a plurality of these substituents may be bonded to each other to form a ring.
- examples of the arylene group represented by Arl and Ar2 include an o-phenylene group, an m-phenylene group, a p-phenylene group, a naphthalenediyl group, Anthracenyl group, naphthacenezyl group, pyrenzyl group, naphthylnaphthalenediyl group, biphenyl group (eg, 3,3, -biphenyl group, 3,6-biphenyl group, etc.), terphenyl group, quaterpheyl group -Ruzyl group, quink-fil-zyl group, sexif-ru-zyl group, septi-fer-zyl group, octif-fer-z-yl group, Novi-fer-j-yl group And a diphenyl group.
- the arylene group further comprises R—R
- the divalent aromatic heterocyclic group represented by Arl and Ar2 is a furan ring, a thiophene ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, and a triazine ring.
- the divalent linking group represented by L is an alkylene group (eg,
- methylene group ethylene group, trimethylene group, tetramethylene group, propylene group, ethylethylene group, pentamethylene group, hexamethylene group, 2,2,4 trimethylhexamethylene group, heptamethylene group, otatamethylene group, nonamethylene group Group, decamethylene group, dimethylene group, methylene group, dodecamethylene group, cyclohexylene group (eg, 1,6-cyclohexanediyl group), cyclopentylene group (eg, 1,5-cyclopentanediyl group) ), Hydrocarbons such as alkylene groups (eg, vinylene group, probenylene group, etc.), alkylene groups (eg, ethylenylene group, 3 -pentylene-group, etc.), arylene groups, etc.
- alkylene groups eg, vinylene group, probenylene group, etc.
- alkylene groups eg, ethylen
- a group containing a hetero atom for example, a divalent group containing a chalcogen atom such as OS—, an N (R) — group, where R is a hydrogen atom or an alkyl group
- R is a hydrogen atom or an alkyl group
- the alkyl group has the same meaning as the alkyl group exemplified as the substituent represented by each of R to R in the general formula (10).
- alkylene group alkenylene group, alkynylene group, and arylene group
- the divalent linking group represented by L for example, a group having a divalent heterocyclic group is used, and examples thereof include an oxazolediyl group, a pyrimidinediyl group, a pyridazinediyl group, and a pyrandiyl Group, pyrrolidinyl group, imidazolindyl group, imidazolidindyl group, villa Examples include azolidinediyl group, a pyrazolindyl group, a pyridindiyl group, a pyrazindiyl group, a morpholindyl group, a quinuclidinediyl group, and the like, and a thiophene2,5-diyl group and a pyrazine2,3 diyl group.
- it may be a divalent linking group derived from a compound having an aromatic heterocyclic ring (also referred to as a heteroaromatic
- it may be a group connecting and linking hetero atoms such as an alkylimino group, a dialkylsilanediyl group and a diarylgermandyl group.
- an organic EL device having higher luminous efficiency can be obtained. Further, a longer life organic EL device can be obtained.
- the light-emitting layer according to the present invention further contains a carboline derivative and an derivative having a ring structure in which at least one of carbon atoms of a hydrocarbon ring constituting a carboline ring is substituted with a nitrogen atom.
- the light emitting layer according to the present invention can be formed by forming a film of the above compound by a known thin film forming method such as a vacuum evaporation method, a spin coating method, a casting method, and an LB method.
- the thickness of the light-emitting layer is not particularly limited, but is usually selected in the range of 5 nm.
- the light-emitting layer may have a single-layer structure of one or more of these light-emitting materials, or may have a laminated structure including a plurality of layers having the same composition or different compositions.
- this light-emitting layer is formed by dissolving the above-mentioned light-emitting material together with a binder such as resin in a solvent to form a solution.
- the spin coat It can be formed by forming a thin film by a method or the like. The thickness of the light-emitting layer formed in this manner can be appropriately selected according to circumstances in which there is no particular limitation.
- Blocking layer (electron blocking layer, hole blocking layer) >>
- the blocking layer for example, an electron blocking layer and a hole blocking layer
- the thickness of the blocking layer according to the present invention is preferably from 3 nm to 100 nm, more preferably from 5 nm to 30 nm.
- the hole blocking layer has the function of an electron transporting layer in a broad sense, and has the ability to transport electrons and has a very small ability to transport holes, and thus blocks holes while transporting electrons. By doing so, the recombination probability of electrons and holes can be improved.
- the platinum complex according to the present invention, the ortho-metallated complex, the above-mentioned general formula (1)-(9) may be added to an adjacent layer adjacent to the light emitting layer, for example, a hole blocking layer, an electron blocking layer, or the like. ), Or a tautomer of the above-mentioned orthometallide complex can be preferably used for the hole blocking layer.
- the platinum complex, the ortho-metalated complex, the ortho-metallized platinum complex represented by the general formula (1)-(9) or the tautomer of the ortho-metallized platinum complex represented by the general formula (1)-(9) may be used as a hole-blocking layer.
- the platinum complex When the platinum complex is contained in the blocking layer, the platinum complex may be contained in a state of 100% by mass as a layer, or may be mixed with another organic compound or the like.
- hole blocking layer for example, JP-A-11-204258 and JP-A-11-204359, and "Organic EL Devices and the Forefront of Industrialization (N.T.S. Issue)) on page 237 etc. can be applied as the hole blocking layer according to the present invention.
- the configuration of the electron transport layer described later can be used as necessary as the hole blocking layer according to the present invention.
- the hole blocking layer according to the present invention at least one of carbon atoms of the above carboline derivative or a hydrocarbon ring constituting the carboline ring of the carboline derivative is replaced with a nitrogen atom! / It is preferable to contain a derivative having a ring structure.
- the hole blocking layer according to the present invention preferably contains a boron derivative, more preferably a boron derivative represented by the following general formula (12).
- B represents a boron atom
- R 1, R 2 and R 3 are each a substituent
- R 1, R 2 and R 3 is an aryl group or an aromatic complex.
- examples of the aryl group represented by R 1, R 2 and R 3 include, for example,
- a p-chlorophenyl group a mesityl group, a tolyl group, a xylyl group, a biphenyl group, a naphthyl group, an anthryl group, and a phenanthryl group.
- examples of the aromatic heterocyclic group represented by R 1, R 2 and R 3 include
- Examples thereof include a furyl group, a phenyl group, a pyridyl group, a pyridazinyl group, a pyrimidinyl group, a pyrazuryl group, a triazinyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, a quinazolinyl group, a carbazolyl group, and a phthalazinyl group.
- an electron blocking layer has the function of a hole transporting layer in a broad sense, and has the ability to transport holes and has a very small ability to transport electrons. By blocking the electrons, the recombination probability of electrons and holes can be improved. Further, the configuration of the hole transport layer described later can be used as an electron blocking layer as needed.
- the platinum complex according to the present invention is preferably used for the adjacent layer adjacent to the light emitting layer, that is, the hole blocking layer and the electron blocking layer. It is preferably used for a layer. [0243] ⁇ Hole transport layer >>
- the hole transport layer includes a material having a function of transporting holes.
- a hole injection layer and an electron blocking layer are also included in the hole transport layer.
- the hole transport layer may be provided as a single layer or a plurality of layers.
- the hole transport material is not particularly limited, and is conventionally used as a hole charge injection / transport material in photoconductive materials, and is used for a hole injection layer and a hole transport layer of an EL element. Any one of known ones used can be selected and used.
- the hole transporting material has a hole injection / transportation and / or electron barrier property, and may be either an organic substance or an inorganic substance.
- triazole derivatives oxazidazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, furylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styryl anthracene derivatives, fluorenone derivatives, hydrazone derivatives , Stilbene derivatives, silazane derivatives, aniline-based copolymers, and conductive polymer oligomers, particularly thiophene oligomers.
- the hole transporting material As the hole transporting material, the above-mentioned materials can be used. It is preferable to use a porphyrin compound, an aromatic tertiary amine compound and a styrylamine compound, particularly an aromatic tertiary amine compound. ,.
- aromatic tertiary amylide and the styrylamine diary include N, N, N
- N, -tetraphenyl-4,4,1-diaminophenol N, N, -diphenyl-N, N, 1-bis (3-methylphenyl)-[1,1, -biphenyl] 4,4, diamine (TPD); 2,2 bis (4-zy P-tolylaminophenol) propane; 1,1-bis (4-di-p-tolylaminophenyl) cyclohexane; N, N, ⁇ ', ⁇ , -tetra- ⁇ - Tolyl 4,4, diaminobiphenyl; 1,1 bis (4 g ⁇ -tolylaminophenyl) 4-phenylcyclohexane; bis (4-dimethylamino-2-methylphenyl) phenyl methane; bis (4-g ⁇ , tolylaminophenyl) phenylmethane; ⁇ , ⁇ , diphenyl ⁇ ⁇ , ⁇ , di (4-methoxyphenyl) 4, 4'
- NPD 4,4'bis [N- (1naphthyl) N-phenylamino] biphenyl (NPD), described in JP-A No. 4308688. 4,4,4,4, -tris [? ⁇ — (3-methylphenyl) N-phenylamino] triphenylamine (MTD AT) A) and the like.
- a polymer material in which these materials are introduced into a polymer chain, or in which these materials are used as a polymer main chain, can also be used.
- inorganic compounds such as p-type Si and p-type SiC can also be used as the hole injection material and the hole transport material.
- the hole transporting material of the hole transporting layer more preferably has a fluorescence maximum wavelength of 415 nm or less, and more preferably has a 0-0 band force of phosphorescence of 50 nm or less. . Further, the hole transport material preferably has a high Tg.
- the hole transporting layer is formed by thinning the hole transporting material by a known method such as a vacuum evaporation method, a spin coating method, a casting method, an ink jet method, and an LB method. be able to.
- the thickness of the hole transport layer is not particularly limited, but is usually about 5 nm to 50 OO nm.
- the hole transport layer may have a single-layer structure composed of one or more of the above materials.
- Electron transport layer >>
- the electron transport layer is a material having a function of transporting electrons.
- an electron injection layer and a hole blocking layer are also included in the electron transport layer.
- the electron transporting layer may have a single layer or a plurality of layers.
- the electron transporting material also serving as a hole blocking material used in the electron transporting layer having a single layer and the electron transporting layer adjacent to the light emitting layer on the cathode side with respect to the light emitting layer includes the following.
- the above materials are known.
- any material can be selected from conventionally known compounds. You can be there.
- Examples of the material used for the electron transport layer include:-a heterocyclic ring such as a -substituted fluorene derivative, a difluoroquinone derivative, a thiopyrandioxide derivative, or a naphthalene perylene.
- Examples include tetracarboxylic anhydride, carbodiimide, fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, and oxaziazole derivatives.
- a thiadiazole derivative in which the oxygen atom of the oxaziazole ring is substituted with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring which is known as an electron-withdrawing group, can also be used as the electron transporting material.
- a polymer material in which these materials are introduced into a polymer chain, or in which these materials are used as a polymer main chain, can also be used.
- metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum- (Alq), tris (5,7-dichrolic-8-quinolinol) aluminum, and tris (5,7-dibuchimo) — 8- (quinolinol) aluminum, tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum, bis (8-quinolinol) zinc (Znq), etc.
- Metal complexes replaced by Mg, Cu, Ca, Sn, Ga or Pb can also be used as electron transport materials.
- metal-free or metal phthalocyanine or those whose terminals are substituted with an alkyl group ⁇ sulfonic acid group or the like can be preferably used as the electron transporting material.
- the distyryl virazine derivative exemplified as a material for the light emitting layer can be used as an electron transporting material, and like the hole injection layer and the hole transporting layer, n-type Si, n-type SiC, etc.
- Inorganic semiconductors can also be used as electron transport materials.
- the electron transport layer can be formed by thinning the above-mentioned electron transport material by a known method such as a vacuum evaporation method, a spin coating method, a casting method, an inkjet method, and an LB method. it can.
- the thickness of the electron transport layer is not particularly limited, but is usually about 5 to 5000 nm.
- the electron transport layer may have a single-layer structure made of one or more of the above materials.
- the injection layer is provided as needed, and has an electron injection layer and a hole injection layer. As described above, the injection layer exists between the anode and the light emitting layer or the hole transport layer, and between the cathode and the light emitting layer or the electron transport layer. May be present.
- the injection layer is a layer provided between the electrode and the organic layer for lowering the driving voltage and improving the light emission luminance, and is described in "Organic EL Device and Its Industrial Frontier (November 30, 1998 The details are described in Chapter 2, Chapter 2, “Electrode Materials” (pages 123-166) of Vol. 2, No. 2, pp. 123-166, and the hole injection layer (anode buffer layer) and the electron injection layer (cathode buffer). One).
- one layer of the anode buffer (hole injection layer) is described in JP-A-9-45479, JP-A-9-260062, JP-A-8-288069 and the like.
- JP-A-6-325871, JP-A-9-17574, and JP-A-10-74586 One layer of metal buffer represented by strontium aluminum, one layer of alkali metal compound represented by lithium fluoride, one layer of alkaline earth metal compound represented by magnesium fluoride, and represented by aluminum oxide And one layer of a buffer for the oxidizing substance.
- the above-mentioned buffer layer is preferably a very thin film, but its thickness is preferably in the range of 0.1 nm to 100 nm.
- This injection layer can be formed by thin-filming the above-mentioned material by a known method such as a vacuum evaporation method, a spin coating method, a casting method, an ink jet method, and an LB method.
- the thickness of the injection layer is not particularly limited, but is usually about 5 to 5000 nm.
- the injection layer may have a single-layer structure in which one or more of the above-mentioned materials are used.
- anode according to the organic EL element of the present invention a metal having a large work function (4 eV or more), Those using an alloy, an electrically conductive compound and a mixture thereof as an electrode material are preferably used.
- an electrode substance include metals such as Au, and conductive transparent materials such as Cul, indium tin oxide (ITO), SnO, and ZnO.
- ITO indium tin oxide
- SnO Tin oxide
- ZnO ZnO
- IDIXO In O-
- a material capable of forming an amorphous transparent conductive film such as ZnO may be used.
- the anode is used to form a thin film by depositing these electrode materials by vapor deposition or sputtering, etc., and to form a pattern of a desired shape by one photolithography method. m or more), a pattern may be formed through a mask having a desired shape at the time of vapor deposition or sputtering of the electrode material.
- the transmittance be greater than 10%
- the sheet resistance of the anode is preferably several hundred ⁇ / square or less.
- the film thickness is selected in the range of usually 10 to 1000 nm, preferably 10 to 200 nm, depending on the material.
- a metal having a low work function (4 eV or less) (referred to as an electron injecting metal), an alloy, an electrically conductive compound, and a mixture thereof are used as an electrode material.
- an electrode material include sodium, sodium monolithium alloy, magnesium, lithium, a mixture of magnesium and copper, a mixture of magnesium and silver, a mixture of magnesium and aluminum, a mixture of indium magnesium and a mixture of aluminum and aluminum, and a mixture of aluminum and zinc oxide. (Al 2 O 3) mixture, indium, lithium
- Examples include a 23Z aluminum mixture, a rare earth metal, and the like.
- a mixture of an electron-injection metal and a second metal which is a stable metal having a large work function, such as a magnesium Z-silver mixture, Magnesium Z aluminum mixture, Magnesium Z indium mixture, Aluminum Z oxidized aluminum (Aio) mixture
- the cathode can be manufactured by forming a thin film of these electrode materials by a method such as evaporation or sputtering. Further, the sheet resistance as the cathode is preferably several hundred ⁇ / square or less, and the preferred film thickness is usually selected in the range of 10 nm to 1000 nm, preferably 50 nm to 200 nm. In order to transmit light, if one of the anode and the cathode of the organic EL element is transparent or translucent, it is convenient because the emission luminance is improved. [0268] ⁇ Substrate (also with substrate, substrate, support, etc.!) >>
- the substrate for the organic EL device of the present invention is not particularly limited in the type of glass, plastic, etc., and is not particularly limited as long as it is transparent. And a light-transmitting resin film.
- Particularly preferred V is a resin film that can provide flexibility to the organic EL device.
- Examples of the resin film include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether sulfone (PES), polyether imide, polyether ether ketone, polyphenylene sulfide, polyarylate, polyimide, and polycarbonate (PC). And cellulose triacetate (TAC) and cellulose acetate propionate (CAP).
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PES polyether sulfone
- PES polyether imide
- polyether ether ketone polyphenylene sulfide
- PC polycarbonate
- TAC cellulose triacetate
- CAP cellulose acetate propionate
- the water vapor transmission rate of 0.01 gZm 2 'day'atm or less is high even if an inorganic or organic coating or a hybrid coating of both is formed on the surface of the resin film.
- it is a film.
- the organic electroluminescent device of the present invention has an external extraction efficiency of light emission at room temperature of preferably 1% or more, more preferably 2% or more.
- the quantum efficiency (%) extracted from the outside is the number of photons emitted to the outside of the organic EL element Z The number of electrons flowing to the organic EL element X 100.
- a hue improvement filter such as a color filter may be used in combination.
- a film having a roughened surface such as an anti-glare film
- a film having a roughened surface such as an anti-glare film
- an anode / hole injection layer / hole transport layer As an example of the method for producing the organic EL device of the present invention, an anode / hole injection layer / hole transport layer
- a method for manufacturing an organic EL device comprising a Z light emitting layer, a Z hole blocking layer, an Z electron transport layer, a Z cathode buffer layer, and a Z cathode will be described.
- a desired electrode material for example, a thin film serving as an anode material is deposited on an appropriate substrate by vapor deposition or sputtering to a thickness of 1 ⁇ m or less, preferably lOnm-200 nm. It is formed by a method to produce an anode.
- a thin film containing an organic compound such as a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, and an electron transport layer, which are element materials, is formed thereon.
- Examples of the method of forming a thin film containing the organic compound include a spin coating method, a casting method, an ink jet method, a vapor deposition method, and a printing method as described above.
- the vacuum evaporation method or the spin coating method is particularly preferable in that pinholes are hardly generated. Further, a different film forming method may be applied to each layer. If you use the film adopts the deposition, the deposition conditions vary due to kinds of materials used, generally baud preparative heating temperature 50 ° C- 450 ° C, vacuum degree of 10- 6 Pa- 10- 2 It is desirable to appropriately select a pressure within the range of Pa, a deposition rate of 0. Olnm-50 ⁇ mZ seconds, a substrate temperature of 50 ° C-300 ° C, and a film thickness of 0.1 nm-5 ⁇ m.
- a thin film that also serves as a cathode material is formed thereon by a method such as vapor deposition or sputtering so as to have a thickness of 1 ⁇ m or less, preferably 5 Onm-200 nm.
- a desired organic EL device can be obtained by forming and providing a cathode. In the production of this organic EL device, it is preferable to produce from the hole injection layer to the cathode consistently by one evacuation, but it is not tough to take it out and apply a different film forming method. At that time, consideration must be given to performing the work in a dry inert gas atmosphere.
- the display device of the present invention will be described.
- the display device of the present invention may be monochromatic or multicolored.
- a multicolored display device will be described.
- a shadow mask is provided only when the light-emitting layer is formed, and a film can be formed on one surface by an evaporation method, a casting method, a spin coating method, an inkjet method, a printing method, or the like.
- the method is not particularly limited, but is preferably an evaporation method, an inkjet method, or a printing method.
- a pattern Jung using a shadow mask is preferable.
- the production order can be reversed, and the cathode, the electron transport layer, the hole blocking layer, the light emitting layer, the hole transport layer, and the anode can be produced in this order.
- a DC voltage is applied to the multicolor display device thus obtained, light emission can be observed by applying a voltage of about 2 to 40 V with the anode being + and the cathode having one polarity. Also, even if a voltage is applied in the opposite polarity, no current flows and no light emission occurs. Furthermore, when an AC voltage is applied, light is emitted only when the anode is in the + state and the cathode is in the 1 state.
- the waveform of the applied AC is arbitrary.
- the multicolor display device can be used as a display device, a display, and various light-emitting light sources.
- full-color display can be achieved by using three types of organic EL elements that emit blue, red, and green light.
- Examples of the display device and display include a television, a personal computer, a mono device, an AV device, a character broadcast display, and an information display in a car.
- the driving method may be either a simple matrix (passive matrix) method or an active matrix method.
- Light-emitting sources include home lighting, car interior lighting, clocks and backlights for LCDs, signboard advertisements, traffic lights, light sources for optical storage media, light sources for electrophotographic copiers, light sources for optical communication processors, and light sensors.
- a light source or the like may be mentioned, but the light source is not limited thereto.
- the lighting device of the present invention will be described.
- the organic EL device of the present invention may be used as an organic EL device having a resonator structure, and the organic EL device having such a resonator structure may be used as a light source for an optical storage medium, an electronic device, or the like.
- laser oscillation may be used for the above purpose.
- the organic EL device of the present invention may be used as a kind of lamp such as an illumination light source or an exposure light source, a projection device of an image projection type, or a still image or a moving image. You may use it as a display device (display) of the type which can be visually recognized directly.
- the driving method may be either a simple matrix (passive matrix) method or an active matrix method. Or have different emission colors.
- FIG. 1 is a schematic diagram showing an example of a display device configured with an organic EL element.
- FIG. 2 is a schematic view of a display such as a mobile phone for displaying image information by light emission of an organic EL element.
- the display 1 also includes a display unit A having a plurality of pixels, and a control unit B for performing image scanning of the display unit A based on image information.
- the control unit B is electrically connected to the display unit A, sends a scanning signal and an image data signal to each of a plurality of pixels based on image information from the outside, and controls the pixels for each scanning line by the scanning signal. , Sequentially emit light according to the image data signal, perform image scanning, and display image information on the display unit A.
- FIG. 2 is a schematic diagram of the display unit A.
- the display portion A includes a wiring portion including a plurality of scanning lines 5 and data lines 6, and a plurality of pixels 3 and the like on a substrate.
- the main members of the display unit A will be described below.
- the figure shows a case where the light power emitted by the pixel 3 is extracted in the white arrow direction (downward).
- the scanning line 5 and the plurality of data lines 6 of the wiring portion are each made of a conductive material, and the scanning line 5 and the data line 6 are orthogonal to each other in a grid pattern, and are connected to the pixels 3 at orthogonal positions ( Details are not shown).
- the pixel 3 When a scanning signal is applied from the scanning line 5, the pixel 3 receives an image data signal from the data line 6, and emits light in accordance with the received image data.
- the pixel 3 By properly arranging pixels in the red, green, and blue light emission regions on the same substrate, full color display is possible.
- FIG. 3 is a schematic diagram of a pixel.
- the pixel consists of an organic EL element 10, a switching transistor 11, a driving transistor 12, and a capacitor. It has 13 sensors.
- a full-color display can be performed by using red, green, and blue light emitting organic EL elements as the organic EL elements 10 for a plurality of pixels and juxtaposing them on the same substrate.
- an image data signal is also applied to the drain of the switching transistor 11 via the data line 6 in the control unit B.
- a scanning signal is applied to the gate of the switching transistor 11 via the control unit B scanning line 5
- the driving of the switching transistor 11 is turned on, and the image data signal applied to the drain is transferred to the capacitor 13 and the driving transistor. It is transmitted to the gate of star 12.
- the capacitor 13 is charged according to the potential of the image data signal, and the driving of the drive transistor 12 is turned on.
- the drive transistor 12 has a drain connected to the power supply line 7, a source connected to the electrode of the organic EL element 10, and an organic EL element connected from the power supply line 7 according to the potential of the image data signal applied to the gate. Element 10 is supplied with current.
- the driving of the switching transistor 11 When the scanning signal moves to the next scanning line 5 by the sequential scanning of the control unit B, the driving of the switching transistor 11 is turned off. However, even if the driving of the switching transistor 11 is turned off, the capacitor 13 holds the potential of the charged image data signal, so that the driving of the driving transistor 12 is kept on and the next scanning signal is applied. The organic EL element 10 continues to emit light until the light is emitted. When the next scanning signal is applied by the sequential scanning, the driving transistor 12 is driven according to the potential of the next image data signal synchronized with the scanning signal, and the organic EL element 10 emits light.
- the organic EL element 10 emits light by providing a switching transistor 11 and a driving transistor 12 as active elements to the organic EL element 10 of each of the plurality of pixels, and The element 10 emits light.
- a light emitting method is called an active matrix method.
- the light emission of the organic EL element 10 may be light emission of a plurality of gradations by a multi-valued image data signal having a plurality of gradation potentials, or a predetermined light emission amount by a binary image data signal. No, it's a talent! /.
- the potential of the capacitor 13 is maintained until the next scanning signal is applied. Alternatively, it may be discharged just before the next scanning signal is applied.
- the present invention is not limited to the active matrix method described above, but may be a passive matrix light emission drive in which the organic EL element emits light in accordance with a data signal only when a scanning signal is scanned.
- FIG. 4 is a schematic diagram of a display device using a noisy matrix system.
- a plurality of scanning lines 5 and a plurality of image data lines 6 are provided in a grid pattern facing each other with the pixel 3 interposed therebetween.
- the pixel 3 connected to the applied scanning line 5 emits light in accordance with the image data signal.
- each of the platinum complexes of the following comparison 11-9 has a aryl group which cannot be freely rotated or cannot rotate freely! It has at least one aromatic heterocyclic group.
- the transparent support substrate provided with the ITO transparent electrodes was ultrasonically irradiated with iso-propyl alcohol. After washing, drying with dry nitrogen gas, UV ozone washing was performed for 5 minutes.
- the transparent support substrate was fixed to a substrate holder of a commercially available vacuum vapor deposition apparatus, while five tantalum-made resistance heating boats were filled with ⁇ -NPD, CBP, Ir-10, BCP, and Alq, respectively. Entering
- lithium fluoride was placed in a resistance heating boat made of tantalum and aluminum was placed in a resistance heating boat made of tungsten, and they were attached to a second vacuum tank of a vacuum evaporation apparatus.
- the heating boat containing CBP and the boat containing Ir 10 are independently passed through, and the deposition rate of CBP as a light emitting host and Ir to 10 as a light emitting dopant becomes 100: 7. This was adjusted to a thickness of 30 nm to provide a light emitting layer.
- the heating boat containing the BCP was energized and heated to provide a hole blocking layer with a deposition rate of 0.2 InmZ seconds to 0.2 nmZ seconds and a thickness of 10 nm. Further, the heating containing Alq
- the boat was energized and heated, and a 40 nm-thick electron transport layer was provided at a deposition rate of 0.1-0.2 nmZ seconds.
- Barium oxide 105 a water-trapping agent, is made of high-purity barium oxide powder manufactured by Aldrich and glass-sealed with a fluoroplastic semipermeable membrane (Microtex S—NTF8031Q manufactured by Nitto Denko) with an adhesive. What was pasted on the can 104 was prepared in advance and used. An ultraviolet curable adhesive 107 was used to bond the sealing can and the organic EL element, and the two were adhered by irradiating an ultraviolet lamp to produce a sealing element.
- 101 is a glass substrate provided with a transparent electrode
- 102 is an organic EL layer including the above-described hole injection Z transport layer, light emitting layer, hole blocking layer, electron transport layer
- 103 is a cathode.
- the organic EL elements OLED1-2-1-24 were produced in the same manner as in the production of the organic EL elements OLED1-1 as described in Table 1, except that the light emitting dopant and the light emitting host were changed.
- the external extraction quantum efficiency was expressed as a relative value when the organic EL element OLED1-1 was set to 100.
- the light emission lifetime was expressed as a relative value when the organic EL element OLED1-1 was set to 100.
- the organic EL device manufactured using the platinum complex according to the present invention as the organic EL device material achieved higher luminous efficiency and longer life than the comparative device. Is evident.
- the organic EL devices OLED1-1 and 1-2 for comparison and the organic EL device OLED1-1-5-24 of the present invention all emitted blue light.
- the comparative organic EL elements OLE Dl-3, 1-4 were light blue.
- At least one of the carbon atoms of the compound represented by the above general formula (10) or (11), the carboline derivative or the hydrocarbon ring constituting the carboline ring of the carboline derivative further contains nitrogen.
- a derivative having a ring structure substituted with an atom is used in combination in the light-emitting layer, and also not shown in Table 1, the boron derivative, the carboline derivative, or the hydrocarbon ring constituting the carboline ring of the carboline derivative is used.
- a derivative having a ring structure in which at least one of the carbon atoms is further substituted with a nitrogen atom is used for the hole blocking layer.
- An organic EL device OLED2-1-2-31 was prepared in the same manner as in Example 1 except that the light-emitting dopant and the light-emitting host were changed as shown in Table 2.
- At least one of the compound represented by the general formula (10), the compound represented by the general formula (11), the carboline derivative, and at least one carbon atom of the hydrocarbon ring constituting the carboline ring of the carboline derivative is further improved.
- a derivative having a ring structure substituted by a nitrogen atom is used as a light emitting layer.
- at least one of the carbon atoms of the boron derivative, the carboline derivative or the hydrocarbon ring constituting the carboline ring of the carboline derivative is further substituted with a nitrogen atom.
- the effect described in the present invention was improved by using a derivative having a ring structure in the hole blocking layer.
- An organic EL device OLED3-1-3-24 was produced in the same manner as in Example 1 except that the luminescent dopant and the luminescent host were changed as shown in Table 3. Measurement of quantum efficiency and emission lifetime taken out from the outside were performed in the same manner as in Example 1. At this time, each value is represented by a relative value of each sample of the organic EL element when the value of OLED3-1 is set to 100. Table 2 shows the results.
- Table 3 shows that the organic EL device using the compound of the present invention as a light emitting dopant has higher luminous efficiency and light emission life than the comparative device.
- the emitted colors of the devices of the present invention were all red.
- At least one of the compound represented by the general formula (10), the compound represented by the general formula (11), the carboline derivative, and at least one carbon atom of the hydrocarbon ring constituting the carboline ring of the carboline derivative is further improved.
- the boron derivative, the carboline derivative or the hydrocarbon constituting the carboline ring of the carboline derivative can be obtained.
- An organic EL element OLED4-1 was produced in exactly the same manner as the organic EL element OLED2-1 of Example 2. Next, in the fabrication of the organic EL element OLED4-1, the organic EL element OLED4-2-419 was prepared in the same manner except that the light emitting host, the light emitting dopant, and the hole blocking material were changed as shown in Table 4. Produced.
- Table 4 shows that the device of the present invention can achieve higher luminous efficiency and luminous life than the comparative device.
- the emission colors of the organic EL devices of the present invention were all green.
- At least one of the carbon atoms of the compound represented by the general formula (10), the compound represented by the formula (11), the carboline derivative or the hydrocarbon ring constituting the carboline ring of the carbolin derivative is furthermore preferable.
- a derivative having a ring structure substituted with a nitrogen atom is used in combination with the light-emitting layer, at least one of the carbon atoms of the boron derivative, the carboline derivative, or the hydrocarbon ring constituting the carboline ring of the carboline derivative further contains nitrogen.
- the organic EL device OLED 1-5 of Example 1 was used as a blue light emitting device.
- the organic EL element OLED2-7 of Example 2 was used as a green light emitting element.
- the organic EL element OLED3-8 of Example 3 was used as a red light emitting element.
- each of the red, green, and blue light emitting organic EL devices produced above was juxtaposed on the same substrate to produce an active matrix type full-color display device having the form shown in FIG. 1, and FIG. Only a schematic diagram of the display unit A of the display device manufactured is shown. That is, on the same substrate, a wiring portion including a plurality of scanning lines 5 and data lines 6 and a plurality of juxtaposed pixels 3 (pixels in a red region, pixels in a green region, pixels in a blue region, etc.)
- the scanning lines 5 and the plurality of data lines 6 of the wiring portion are each made of a conductive material, and the scanning lines 5 and the data lines 6 are orthogonal to each other in a grid and are connected to the pixels 3 at orthogonal positions.
- the plurality of pixels 3 are driven by an active matrix method provided with an organic EL element corresponding to each emission color, a switching transistor as an active element, and a driving transistor, and a scanning signal is applied from a scanning line 5. Then, an image data signal is received from the data line 6 and light is emitted according to the received image data.
- a full-color display device was manufactured by juxtaposing the red, green, and blue pixels as appropriate.
- the electrode of the transparent electrode substrate of Example 1 was patterned into 20 mm ⁇ 20 mm, and ⁇ -NPD was formed thereon as a hole injection / transport layer with a thickness of 25 nm as in Example 1, and further,
- the above-mentioned heated boat containing CBP, the boat containing Compound 6 of the present invention, and the boat containing Ir 9 are independently energized to emit CBP as a light-emitting host and compounds 6 and Ir to 9 of the present invention as light-emitting dopants.
- the deposition rate was adjusted to 100: 5: 0.6, and the deposition was performed to a thickness of 30 nm to provide a light emitting layer.
- BCP was formed by lOnm to form a hole blocking layer.
- Alq was deposited at 40nm.
- An electron transport layer was provided.
- Example 2 a square perforated mask having substantially the same shape as the transparent electrode made of stainless steel was placed on the electron injection layer, and 0.5 nm of lithium fluoride and a cathode were used as a cathode buffer layer.
- a cathode buffer layer was formed by vapor deposition of aluminum with a thickness of 150 nm.
- Fig. 6 shows a schematic diagram of a flat lamp.
- Fig. 6 (a) shows a schematic plan view and Fig. 6 (b) shows a schematic cross-sectional view.
- an organic EL device material which is a platinum complex having a ligand having at least one aryl group or aromatic complex ring group, each of which cannot rotate freely due to steric hindrance, and the device material are used.
- An organic EL element, a lighting device, and a display device exhibiting high luminous efficiency and having a long luminous life could be provided.
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Abstract
Description
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Also Published As
Publication number | Publication date |
---|---|
JPWO2005083033A1 (ja) | 2007-11-22 |
JP4952247B2 (ja) | 2012-06-13 |
US20070184301A1 (en) | 2007-08-09 |
US8178214B2 (en) | 2012-05-15 |
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