WO2006049013A1 - 縮合環含有化合物及びそれを用いた有機エレクトロルミネッセンス素子 - Google Patents
縮合環含有化合物及びそれを用いた有機エレクトロルミネッセンス素子 Download PDFInfo
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Definitions
- the present invention relates to a novel condensed ring-containing compound and an organic electoluminescence (EL) device using the same, and in particular, an organic EL device having high luminous efficiency and heat resistance and an extremely long life, and the realization thereof.
- the present invention relates to a condensed ring-containing compound.
- a fluorescent molecule in a singlet excited state (sometimes referred to as an S1 state) undergoes a radiation transition to a ground state. It utilizes the fluorescence emission phenomenon (luminescence phenomenon), which is the energy conversion that occurs in the process.
- a fluorescent molecule in a triplet excited state (sometimes referred to as a T1 state) in an organic light-emitting medium is also assumed, but the radiative transition to the ground state is a forbidden transition, so that a strong fluorescent molecule Will gradually transition from a triplet excited state to another state by a non-radiative transition. As a result, instead of producing fluorescence, thermal energy is released.
- the singlet and triplet mean the multiplicity of energy determined by the number of combinations of the total spin angular momentum and the total orbital angular momentum of the fluorescent molecule.
- the singlet excited state is defined as the energy state when one electron is transitioned to a higher energy level from the ground state where there is no unpaired electron without changing the spin state of the electron.
- the triplet excited state is defined as the energy state when one electron is transitioned to a higher energy level with the electron spin state reversed.
- the emission from the triplet excited state defined in this way can be observed at an extremely low temperature, for example, the liquid temperature of liquid nitrogen (minus 196 ° C), but it is practical. Under the temperature condition, it was just a small amount of luminescence.
- the total efficiency of light emission in the conventional organic EL device is the recombination efficiency ( ⁇ ) of injected charge carriers (electrons and holes) and the probability that the generated excitons cause a radiative transition.
- an organic EL element including an organic light emitting layer composed of 4, 4-N, N-dicarbazolylbiphenyl and an Ir complex as a phosphorescent dopant, a light emission phenomenon is achieved. Has been reported to produce.
- Patent Documents 1 and 2 a specific compound having a pyrimidine ring or a quinazoline ring is highly efficient as an electron transporting material. It is disclosed that an organic electoluminescence device with improved efficiency and longer life can be obtained.
- Patent Document 3 discloses a specific compound group in which a triazine ring and a carbazolyl group are linked as a host compound for blue.
- Patent Document 4 exemplifies a compound having both a benzimidazolyl group and a carbazolyl group, which are nitrogen-containing condensed bicyclic groups in which a 5-membered ring and a 6-membered ring are condensed.
- a compound having both a benzimidazolyl group and a carbazolyl group which are nitrogen-containing condensed bicyclic groups in which a 5-membered ring and a 6-membered ring are condensed.
- device performance There is no illustration of device performance.
- six There are no examples of compounds containing both a nitrogen-containing fused bicyclic group with two membered rings and a powerful rubazolyl group, and these compounds are used as host materials for phosphorescence, and examples are disclosed. It has not been.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2003-031004
- Patent Document 2 Japanese Patent Laid-Open No. 2003-045662
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-193952
- Patent Document 4 Japanese Patent Laid-Open No. 2002-319419
- Non-Patent Document 1 Jpn. J. Appl. Phys., 38 (1999) L1502
- the present invention has been made to solve the above-described problems, and provides an organic EL device having a high luminous efficiency and heat resistance and a long lifetime, and a condensed ring-containing compound that realizes the organic EL device. With the goal.
- a condensed bicyclic group having a specific structure in particular, a condensed bicyclic group in which two six-membered rings are condensed, and a powerful rubazolyl group.
- a condensed ring-containing compound having a Z or indolyl group can be used effectively as a host material for an organic EL device, and can effectively emit light using a triplet exciton state.
- the present invention has been completed by finding that an organic EL device having a long lifetime and excellent in luminous efficiency and heat resistance can be obtained.
- the present invention includes a condensed bicyclic group represented by the following general formulas (1) and Z or (2), and at least one rubazolyl group selected from the following general formulas (3) to (8):
- a condensed ring-containing compound having Z or indolyl group is provided.
- X to X each independently represent a nitrogen atom, an oxygen atom, a sulfur atom or a carbon atom.
- z is an atomic group forming a cyclic structure.
- R may have an aryl group having 6 to 50 nuclear carbon atoms which may have a substituent, a heterocyclic group having 5 to 50 nuclear atoms which may have a substituent, or a substituent. It may have an alkyl group having 1 to 50 carbon atoms, a substituent, an alkoxy group having 1 to 50 carbon atoms, or a substituent !, an aralkyl group having 7 to 50 nuclear carbon atoms, or a substituent. An aryloxy group having 5 to 50 nuclear carbon atoms, an arylothio group having 5 to 50 nuclear carbon atoms that may have a substituent, and an alkoxycarbo having 1 to 50 carbon atoms that may have a substituent. -Group, carboxyl group, halogen atom, cyano group, nitro group or hydroxyl group, and when there are plural Rs, they may be bonded to each other to form a cyclic structure.
- n are each an integer of 0 to 10.
- R is the same as defined above, and a and b are each an integer of 0 to 4.
- V is a single bond, —CR R′—, —SiR R′—, —O—, —CO— or —NR
- R and R Each independently represents a hydrogen atom, an aryl group having 6 to 50 nuclear carbon atoms which may have a substituent, or a substituent! A heterocycle group having 5 to 50 nucleus atoms or a substituent. It is an alkyl group having 1 to 50 carbon atoms. ).
- E represents a cyclic structure indicated by a circle surrounding the symbol E, and may have a substituent, a carbon atom of 3 to 20 carbon atoms may be replaced by a nitrogen atom, a cycloalkane residue, a substituent Or an aryl group having 4 to 50 nuclear carbon atoms or a substituent, or a heterocyclic group having 4 to 50 nuclear atoms.
- the present invention provides an organic EL device in which an organic thin film layer composed of one or more layers having at least a light emitting layer is sandwiched between a cathode and an anode, and at least one of the organic thin film layers is
- the present invention provides an organic EL device containing a condensed ring-containing compound alone or as a component of a mixture.
- the organic EL device using the fused ring-containing compound of the present invention has a very long life while being excellent in luminous efficiency and heat resistance, and is practical.
- the condensed ring-containing compound of the present invention includes a condensed bicyclic group represented by the following general formula (1) and Z or (2), and at least one of the following general formulas (3) to (8): It is a compound having strong rubazolyl groups and Z or indolyl groups.
- X to X are independently a nitrogen atom, an oxygen atom,
- a sulfur atom or a carbon atom preferably a nitrogen atom.
- At least one of X, X and X is a nitrogen atom.
- Z is an atomic group that forms a cyclic structure.
- Annular structure As the atomic group forming, for example, an ethylene group, a propylene group, an n-butylene group, an n-pentylene group, an n- hexylene group or the like, and at least one of the carbon atoms of these alkylene groups is nitrogen.
- cyclic structure examples include, for example, cycloalkanes having 4 to 12 carbon atoms such as cyclobutane, cyclopentane, cyclohexane, adamantane and norbornane, and carbon atoms such as cyclobutene, cyclopentene, cyclohexene, cycloheptene and cyclootaten.
- cycloalkanes having 4 to 12 carbon atoms such as cyclobutane, cyclopentane, cyclohexane, adamantane and norbornane
- carbon atoms such as cyclobutene, cyclopentene, cyclohexene, cycloheptene and cyclootaten.
- 12Cycloalkene, Cyclohexagen, Cyclohexa C6-12Cycloalkadiene such as Benzene, Naphthalene, Phenanthrene, Anthracen
- Aromatic ring pyrazole, imidazole, pyrazine, pyrimidine, indazole, purine, phthalazine, naphthyridine, quinoxaline, quinazoline, cinnoline, pteridine, perimidine, phenanthoracin, pyrroloimidazole, pyrrolotri Azole, pyrazomouth imidazole, pyrazolotriazole, pyrazolopyrimidine, pyrazolotriazine, imidazoimidazole, imidazopyridazine, imidazopyridine, imidazopyrazine, triazolopyridine, benzimidazole, naphthimidazole, benzoxazole, naphthoxazole And heterocyclic rings having 5 to 50 nuclear atoms such as benzothiazol, naphthothiazole, benzotriazole, tetrazaindene, triazine, carbazole and the like
- R is an aryl group having 6 to 50 nuclear carbon atoms which may have a substituent, or a heterocyclic ring having 5 to 50 nuclear atoms which may have a substituent.
- Group may have a substituent V, an alkyl group having 1 to 50 carbon atoms, may have a substituent, an alkoxy group having 1 to 50 carbon atoms, or may have a substituent carbon atom number 7 to 50 aralkyl groups, optionally substituted nucleocarbons 5 to 50 aralkyloxy groups, may have substituents !, 5 to 50 aralkyl groups having substituents, and substituents May be an alkoxycarbonyl group having 1 to 50 carbon atoms, a carboxyl group, a halogen atom, a cyano group, a nitro group or a hydroxyl group, and when there are a plurality of R, they are bonded to each other to form a cyclic structure. .
- Examples of the cyclic structure include the same ones as described in Z above.
- m is an integer of 0 to 0 and preferably 1 to 5 in the general formula (2) Oh!
- N is an integer between 0 and 0 and is preferably between 1 and 5! /.
- Examples of the aryl group of R include a phenol group, 1 naphthyl group, 2 naphthyl group, 1 anthryl group, 2 anthryl group, 9 anthryl group, 1-phenanthryl group, 2 phenanthryl group, 3— Phenanthryl group, 4-phenanthryl group, 9-phenanthryl group, 1-naphthalyl group, 2 naphthelyl group, 9 naphthelyl group, 1-pyrole group, 2-pyrole group, 4-pyrylene group , 2 bi-ruyl group, 3 bi-ruyl group, 4-bifuryl-ruyl group, ⁇ tur-fru ru 4 — yl group, p terf leulu 3 — yl group, p turf leulu group 2 — yl group , M-Terferreux 4—yl group, m—Terferreux 3—yl group, m—Terferreux 2—yl group,
- heterocyclic group of R examples include 1 pyrrolyl group, 2 pyrrolyl group, 3 pyrrolyl group, pyrazinyl group, 2 pyridyl group, 3 pyridinyl group, 4 pyridinyl group, 1 indolyl group, 2— Indolyl group, 3-Indolyl group, 4-Indolyl group, 5-Indolyl group, 6-Indolyl group, 7-Indolyl group, 1-Isoindolyl group, 2-Isoindolyl group, 3-Isoindolyl group, 4-Isoindolyl group, 5 —Isoindolyl group, 6-Isoindolyl group, 7-Isoindryl group, 2 Furyl group, 3 Furyl group, 2 Benzofural group, 3 Benzofural group, 4 Benzofuryl group, 5—Benzofuryl group 6-Benzofural group, 7-Benz
- a force including a group in which 1 to 10 benzene rings are bonded such as biphenyl and terphel, and a condensed ring such as naphthyl, anthral, phenanthryl, pyrenyl and copolyol is particularly preferable. This is a combination of 2 to 5 benzene rings, and has many meta bonds that cause the molecule to twist.
- alkyl group of R examples include methyl group, ethyl group, propyl group, isopropyl group, n butyl group, s butyl group, isobutyl group, t butyl group, n pentyl group, n-hexyl group, and n- Ptyl group, n-octyl group, hydroxymethyl group, 1-hydroxyethyl group, 2-hydroxyethyl group, 2-hydroxyisobutyl group, 1,2-dihydroxyethyl group, 1,3 dihydroxyisopropyl group, 2,3 dihydro Xy butyl group, 1, 2, 3 trihydroxypropinole group, chloromethinole group, 1 chloroethinole group, 2 chloroethinole group, 2 cycloisobutyl group, 1,2 dichloroethyl group, 1,3 dichloroisopropyl group, 2,3 dichloro- t-Butyl group, 1, 2, 3 Trich
- Examples of the aralkyl group of R include a benzyl group, a 1-phenylethyl group, a 2-phenylethyl group, a 1-vinylisopropyl group, a 2-vinylisopropyl group, and a phenol-butylene group.
- the alkoxy group of R is represented as OY, and examples of Y include those similar to the alkyl group.
- the aryl group of R is represented as OY ′, and examples of Y ′ include the same as the aryl group.
- the aryl group of R is represented as SY ′, and examples of Y ′ include the same as the aryl group.
- the alkoxycarbonyl group of R is a group represented by COOY, and examples of ⁇ include those similar to the alkyl group.
- substituents of the above groups include halogen atom, hydroxyl group, amino group, nitro group, cyano group, alkyl group, alkenyl group, cycloalkyl group, alkoxy group, aryl group, heterocyclic group, aralkyl group. , An aryloxy group, an alkoxycarbonyl group, a carboxyl group, and the like.
- the condensed bicyclic group represented by the general formula (1) is preferably a condensed bicyclic group represented by the following general formula (13).
- the ring group is preferably a condensed bicyclic group represented by the following general formula (14).
- Examples of the condensed bicyclic group represented by the general formula (1) or (2) include 1H-pyrrolidine, 111 1-pyridine-111 2-pyridine, indolizine, 2H-isoindonorole, fulcurimide, 1H-indole, skatole, indoxyl, indoline-3one, isatin, 1H-indazole, indazoline, 7H-purine, xanthine, 2H-quinolidine, isoquinoline, isoquinolone, bababelin, quinoline, oxine, echinobucin, quinaldic acid, 2, 7 Residues such as naphthyridine, 2,6 naphthyridine, phthalazine, 1,8 naphthyridine, 1,7 naphthyridine, 1,6 naphthyridine, 1,5 naphthyridine, quinoxaline, quinazoline, cinnoline, buteridine, etc. , Nitrogen at the
- Each of these groups may have a substituent which is the same as R described above.
- R is the same as described above, and a and b are integers of 0 to 4, respectively.
- V is a single bond, —CR R′—, —SiR R′—, —O
- R and R ′ may each independently have a hydrogen atom or a substituent.
- V aryl group having 6 to 50 carbon atoms, may have a substituent !, 5 to 50 nuclear atoms or may have a substituent, alkyl group having 1 to 50 carbon atoms It is. ).
- E represents a cyclic structure indicated by a circle surrounding the symbol E, and even if it has a substituent, it has 3 to 20 nuclear carbon atoms and a carbon atom It may be replaced with a nitrogen atom ⁇ A cycloalkane residue or a substituent may be substituted ⁇ An aromatic hydrocarbon group having 4 to 50 carbon atoms or a substituent may be substituted 50 heterocyclic groups.
- Examples of the cycloalkane residue of E include residues such as cyclopropane, cyclobutane, cyclopropane, cyclohexane, cycloheptane, pyrrolidine, piperidine, and piperazine.
- aromatic hydrocarbon group for E examples include benzene, naphthalene, anthracene, naphthacene. , Pyrene, taricene, biphenyl, triphenyl, funole, bisfunole, and the like.
- heterocyclic group of E examples include pyrazole, imidazole, pyrazine, pyrimidine, indazole, purine, phthalazine, naphthyridine, quinoxaline, quinazoline, cinnoline, pteridine, perimidine, phenanthorin, pyrroloimidazole, pyrrolotriazole, and pyrazomouth imine.
- Dazole pyrazolotriazole, pyrazolopyrimidine, pyrazolotriazine, imidazoimidazole, imidazopyridazine, imidazopyridine, imidazopyrazine, triazolopyridine, benzimidazole, naphthimidazole, benzoxazole, naphthoxazole, benzothiazole , Naphthothiazole, benzotriazole, tetrazaindene, triazine, force rubazole and the like.
- Examples of the general formula (3) include structures represented by the following general formulas (15) to (18) (the same structure can be given to the general formula (4);).
- Examples of the general formula (5) include structures represented by the following general formulas (19) to (22).
- the condensed ring-containing compound of the present invention is preferably a condensed ring-containing compound represented by any of the following (9) to (12).
- A is a condensed bicyclic group represented by the general formula (1) and Z or (2). Well, okay.
- Cz is represented by any one of the general formulas (3) to (8). These are rubazolyl groups and / or indolyl groups, and when there are a plurality of Cz, they may be the same or different.
- L is a single bond, an aromatic hydrocarbon group having 6 to 50 nuclear carbon atoms, a heterocyclic group having 2 to 50 nuclear carbon atoms, or an aryl substitution with 2 to 50 nuclear carbon atoms.
- a heterocyclic group, a diaryl substituted heterocyclic group having 2 to 50 nuclear carbon atoms, or a triaryl substituted heterocyclic group having 2 to 50 nuclear carbon atoms, and each of these groups may have a substituent. Multiple cases may be the same or different.
- nl is an integer of 1 to 10, and is preferably an integer of 1 to 5.
- n2 is an integer of 1 to 10, and is an integer of 1 to 5.
- n3 is an integer of 1 to 10, and in general formula (12), preferably an integer of 1 to 5, n4 is an integer of 1 to 10. Yes, preferably an integer between 1 and 5! / ⁇ .
- Examples of the aromatic hydrocarbon group for L include residues such as benzene, naphthalene, anthracene, naphthacene, pyrene, taricene, biphenyl, triphenylene, fluorene, and bisphenolate len.
- heterocyclic group of L examples include, for example, pyrazole, imidazole, pyrazine, pyrimidine, indazole, purine, phthalazine, naphthyridine, quinoxaline, quinazoline, cinnoline, pteridine, perimidine, phenanthorin, pyrroloimidazole, pyrrolotriazole, and pyrazolo.
- L aryl substituted heterocyclic group diaryl substituted heterocyclic group, and triaryl substituted heterocyclic group include those in which the heterocyclic group is substituted with the aromatic hydrocarbon group.
- the condensed ring-containing compound of the present invention is particularly preferably a compound having the following structure.
- fused ring-containing compound of the present invention is shown below, but are not limited to these exemplified compounds.
- the organic EL device of the present invention is an organic EL device in which an organic thin film layer having at least one light emitting layer or a multi-layer force is sandwiched between a cathode and an anode. At least one layer contains the fused ring-containing compound of the present invention alone or as a component of a mixture.
- the light emitting layer contains the condensed ring-containing compound and a luminescent metal complex.
- the fused ring-containing compound is preferably a host material
- the luminescent metal complex is preferably a phosphorescent dopant.
- the host material is the condensed ring-containing compound
- the triplet exciton state of the condensed ring-containing compound can be obtained by combining with the phosphorescent dopant even at room temperature (20 ° C).
- the condensed ring-containing compound of the present invention preferably has a glass transition temperature of 120 ° C or higher, more preferably in the range of 120 ° C to 190 ° C, and more preferably from 130 ° C to More preferably, it is in the range of 180 ° C. If the glass transition temperature is 120 ° C or higher, the organic EL that maintains the long life of crystallization when combined with a phosphorescent dopant and does not easily generate short-circuits when energized under high-temperature environmental conditions. The device usage environment is not limited. In addition, when the glass transition temperature is 190 ° C or lower, the thermal decomposition is difficult to occur when forming a film by vapor deposition.
- glass transition temperature is the change point of specific heat obtained when heated using a scanning calorimeter (DSC, Differential Scanning Calorimetory) in a nitrogen circulation state, for example, at a temperature rising condition of 10 ° CZ.
- DSC scanning calorimeter
- the triplet energy of the condensed ring-containing compound in the light emitting layer is E1
- the triplet energy value of the phosphorescent dopant is E2
- E1> E2 It is preferable to satisfy the relationship. That is, in such a triplet energy relationship, by combining the condensed ring-containing compound and a phosphorescent dopant, the triplet exciton state of the condensed ring-containing compound can be reliably utilized even at room temperature. can do. That is, by securely transferring energy from the triplet state generated by the condensed ring-containing compound to the phosphorescent dopant, the luminescence phenomenon is reduced. Can be generated.
- the light-emitting metal complex is preferably a phosphorescent dopant, and includes at least one metal selected from the group force consisting of Ir, Ru, Pd, Pt, Os, and Re.
- a metal complex is preferred. The reason for this is that if the phosphorescent dopant is a metal complex of these, the triplet exciton force of the fused ring-containing compound of the present invention can be transferred effectively.
- a metal complex having a structure represented by the following formula is preferable.
- ⁇ , ⁇ ' At least one metal selected from the group consisting of Ir, Ru, Pd, Pt, Os, and Re. Even if it has two or more of the same or different metals in its molecule, Good.
- Y, Y ' Ligand. The same or different ligand may be coordinated according to the valence of the metal.
- the light-emitting metal complex used in the present invention is not particularly limited as long as it can be used in an organic EL device, and the ligand of the metal complex is a phenylpyridine skeleton, a phenylquinoline skeleton, a phenol. It is preferable to have at least one skeleton selected from the group force of isoquinoline skeleton, bibilidyl skeleton, phenanthorin skeleton and benzothiophene pyridine skeleton. The reason for this is that by having these skeletons in the molecule, energy of the triplet exciton force of the compound having a condensed ring in the molecule can be transferred effectively.
- luminescent metal complexes examples include tris (2-phenolisoquinoline) iridium (Ir (piq)), tris (2-phenol-pyridine) iridium, bis (2-phenol-quinoline) iridium acetylacetonate ( Ir (pq) (acac)), bis (2-phenylisoquinoline) iridium acetyl cinnatonate (Ir (piq) (acac)), bis (2-benzothiophenpyridine) iridium acetyl acetylate ( Ir (btpy) (acac)), Tris (2-phenol-lysine) ruthenium, Tris (2-phenol-lysine) palladium, Bis (2-phenylpyridine) platinum, Tris (2-phenol-lysine) phos Mum, Tris (2-Ferrubiridine) rhenium, Otaethylplatinum porphyrin, Otaugh For example, gallium
- the amount of the light-emitting metal complex in the light-emitting layer is 0.1 to 50 parts by weight with respect to 100 parts by weight of the condensed ring-containing compound (host material). Preferable 0.5 to 40 parts by weight is even more preferable 1 to 30 parts by weight. The reason for this is that if the amount of the light-emitting metal complex is 0.1 part by weight or more, the effect of addition appears, and the triplet exciton force of the condensed ring-containing compound effectively transfers energy. This is because if the blending amount is 50 parts by weight or less, it is easy to uniformly mix the luminescent metal complex and the emission luminance does not vary.
- Anode Z insulating layer Z hole injecting layer Z hole transporting layer Z light emitting layer Z electron injecting layer Z force that can include structures such as Z cathode The present invention is not limited to these.
- PVK photo-emitting material
- a known method such as a vapor deposition method, a spin coating method, or an LB method can be applied.
- the organic EL device of the present invention may be provided with a hole injection layer having a thickness of 5 nm to 5 ⁇ m.
- a hole injection layer having a thickness of 5 nm to 5 ⁇ m.
- the hole injection into the light emitting layer becomes good, high emission luminance can be obtained, or low voltage driving is possible.
- the hole mobility force measured when a voltage in the range of 1 X 10 4 to 1 X lo Zcm is applied to the hole injection layer is 1 X 10 " 6 cm 2 ⁇ ⁇ sec or more.
- a compound having an ion energy of 5.5 eV or less for example, as a material for such a hole injection layer, such as borfilin compound, aromatic tertiary amine compound, styrylamine compound, aromatic Dimethylidyne compounds and condensed aromatic ring compounds, and more specific examples include 4, 4 ′ bis [N— (1 naphthyl) -N-phenylamino] biphenyl (abbreviated as NPD). And organic compounds such as 4, 4 ', 4 "-tris [N- (3-methylphenol) -N-phenolamino] triphenylamine (abbreviated as MTDATA). Further, it is more preferable to laminate two or more hole injection layers as necessary. At this time, the anode Z hole injection layer 1 (hole injection material 1) Z hole injection layer 2 (hole injection material 2) It is preferred that the ion energy ( ⁇ ⁇ ) is ⁇ (hole injection material 1) ⁇ (hole injection material 2) ⁇
- an inorganic compound such as ⁇ -type-Si or ⁇ -type-SiC as the constituent material of the hole injection layer.
- the between the hole injection layer and the anode layer or the between the hole injection layer and the light emitting layer good also conductivity provided 1 X 10- 1Q sZcm more organic semiconductor layers Good.
- the organic EL device of the present invention may be provided with an electron injection layer having a thickness of 5 nm to 5 ⁇ m.
- an electron injecting layer By providing such an electron injecting layer, electron injection into the light emitting layer is good, high light emission luminance is obtained, or low voltage driving is possible.
- the electron mobility force measured when a voltage in the range of 1 X 10 4 to 1 X lO ⁇ / cm is applied to this electron injection layer is 1 X 10 " 6 cm 2 ZV'sec or more. It is preferable to use a compound having an ion energy exceeding 5.5 eV, such as a metal complex of 8-hydroxyquinoline (A1 chelate: Alq), or a derivative thereof, oxadiazole. Derivatives and the like.
- the organic EL device of the present invention has a thickness of 5 ⁇ between the light emitting layer and the cathode!
- a hole blocking layer of ⁇ 5 ⁇ m may be provided.
- hole blocking layer materials include 2,9-dimethyl-4,7-diphenyl- 1,10-phenanthroline and 2,9-jetyl 4,7-diphenyl- 1,10-phenant. Power to raise phosphorus etc. It is preferable to further contain an alkali metal such as Li or Cs.
- the alkali metal when the alkali metal is contained, it is preferable that the content is 0.01 to 30% by weight when the total amount of the hole blocking layer is 100% by weight. 0.05 to 20% by weight More preferably, the content is 0.1 to 15% by weight. The reason for this is that if the alkali metal content is 0.01% by weight or more, the effect of addition is manifested. If the content is 30% by weight or less, the dispersibility of the alkali metal is uniform and the light emission luminance varies. This is because there is nothing.
- a method for forming the hole injection layer, the electron injection layer, and the hole blocking layer for example, a known method such as a vapor deposition method, a spin coating method, or an LB method can be applied.
- a reducing dopant is preferably added to the interface region between the cathode and the organic thin film layer.
- the reducing dopant includes alkali metal, alkali metal complex, alkali metal compound, alkaline earth metal, alkaline earth metal complex, alkaline earth metal compound, rare earth metal, rare earth metal complex, rare earth metal compound, and halides thereof. And at least one selected from oxides and the like.
- alkali metal examples include Li (work function: 2.93 eV), Na (work function: 2.36 eV), K (work function: 2.28 eV), Rb (work function: 2.16 eV), Cs (work function). : 1. 95 eV) and the like, and those having a work function of 3. OeV or less are particularly preferable. Of these, Li, K, Rb, and Cs are preferred o
- alkaline earth metal examples include Ca (work function: 2.9 eV), Sr (work function: 2.0 to 2.5 eV), Ba (work function: 2.52 eV), and the like. Particularly preferred are those below OeV.
- rare earth metal examples include Sc, Y, Ce, Tb, and Yb, and those having a work function of 3. OeV or less are particularly preferable.
- preferred metals are capable of improving the light emission luminance and extending the life of organic EL devices by adding a relatively small amount to the electron injection region, which has a particularly high reducing ability.
- alkali metal compounds include alkali oxides such as Li 0, Cs 0, and K 2 O, LiF, N
- alkali halides such as aF, CsF, KF, etc.
- alkalis such as LiF, Li 0, NaF
- alkaline earth metal compound examples include BaO, SrO, CaO, and Ba Sr ⁇ ⁇ (0 ⁇ ⁇ 1) mixed with these, Ba Ca O (0 ⁇ x ⁇ 1), BaO, SrO, CaO is preferred x l- ⁇ x 1- ⁇
- rare earth metal compound examples include YbF, ScF, ScO, YO, CeO, GdF, and TbF.
- the alkali metal complex, alkaline earth metal complex, and rare earth metal complex include alkali metal ions, alkaline earth metal ions, and rare earth metal ions as the metal ions, respectively. If it contains at least one of these, there will be no limitation in particular.
- the ligands include quinolinol, benzoquinolinol, ataridinol, phenanthridinol, hydroxyphenylazole, hydroxyphenylthiazole, hydroxydiaryloxadiazole, hydroxydiarylthiadiazole, hydroxy Phenylpyridine, hydroxyphenylbenzoimidazole, hydroxybenzotriazole, hydroxyfulborane, bipyridyl, phenanthrin, phthalocyanine, porphyrin, cyclopentagen, 13-diketones, azomethines, and their derivatives Is preferable, but is not limited thereto.
- the reducing dopant it is preferable to form a layered or island-like shape in the interface region.
- the reducing dopant when forming the reducing dopant in layers, after forming the light emitting material or electron injecting material, which is an organic layer at the interface, into layers, the reducing dopant is vapor-deposited by resistance heating vapor deposition alone, and the layer thickness is preferably 0. Form with l-15nm.
- the reducing dopant When forming the reducing dopant in an island shape, after forming the light emitting material or electron injecting material, which is an organic layer at the interface, in an island shape, the reducing dopant is vapor-deposited alone by resistance heating vapor deposition. It is formed with a thickness of 0.05 to lnm.
- the anode corresponds to the lower electrode or the counter electrode depending on the configuration of the organic EL display device, but the anode has a large work function (for example, 4. OeV or more). Preference is given to using metals, alloys, electrically conductive compounds or mixtures thereof. Specifically, indium stannate (ITO), indium zinc oxide (IZO), copper iodide (Cul), tin oxide (SnO), zinc oxide (ZnO), gold, platinum, no radium, etc.
- ITO indium stannate
- IZO indium zinc oxide
- Cul copper iodide
- SnO tin oxide
- ZnO zinc oxide
- anode having a uniform thickness can be formed using a method capable of forming a film in a dry state such as the D method.
- the anode needs to be a transparent electrode.
- conductive transparent materials such as ITO, IZO, Cul, SnO, ZnO
- the transmittance of EL light emission is set to a value of 70% or more.
- the film thickness of the anode is not particularly limited, but is preferably in the range of 10 to: L, OOOnm, more preferably in the range of 10 to 200 nm. The reason for this is that by setting the anode film thickness within this range, a uniform film thickness distribution and EL light transmittance of 70% or more can be obtained, while the anode sheet resistance is reduced to 1,000. This is because it can be a value of ⁇ / mouth or less, more preferably a value of 100 ⁇ / mouth or less.
- an anode lower electrode
- an organic light emitting medium organic light emitting medium
- a cathode cathode
- the lower electrode and the counter electrode are configured in an XY matrix so that any pixel on the light emitting surface emits light. It is also preferable to let them. That is, by configuring the anode and the like in this manner, various information can be easily displayed in the organic EL element.
- the cathode also corresponds to the lower electrode or the counter electrode depending on the configuration of the organic EL device, but has a low work function (for example, less than 4. OeV) metal, alloy, It is preferred to use electrically conductive compounds or mixtures or inclusions thereof. Specifically, sodium, sodium-potassium alloy, cesium, magnesium, lithium, magnesium silver alloy, aluminum, aluminum oxide, aluminum-lithium alloy, indium, rare earth metal, these metals and organic thin film layer materials It is preferable to use a single electrode material such as a mixture of these and a mixture of these metals and an electron injection layer material, or a combination of two or more of these electrode materials.
- a low work function for example, less than 4. OeV
- electrically conductive compounds or mixtures or inclusions thereof Specifically, sodium, sodium-potassium alloy, cesium, magnesium, lithium, magnesium silver alloy, aluminum, aluminum oxide, aluminum-lithium alloy, indium, rare earth metal, these metals and organic thin film layer materials It is preferable to use a single electrode material
- the thickness of the cathode is not particularly limited as in the case of the anode, but it is preferable to set the value within the range of 10 to L, OOOnm. A value within the range is more preferable. Further, in the case of taking out the EL emission with the cathode power, the cathode needs to be a transparent electrode. In that case, it is preferable to set the EL emission transmittance to a value of 70% or more. As with the anode, the cathode is preferably formed using a method capable of forming a film in a dry state, such as a vacuum deposition method or a sputtering method.
- the support substrate in the organic EL device of the present invention has excellent mechanical strength and is permeable to moisture and oxygen. Specifically, glass plates, metal plates, ceramic plates, or plastic plates (polycarbonate resin, acrylic resin, butyl chloride resin, polyethylene terephthalate resin, polyimide resin) are preferred. Fat, polyester resin, epoxy resin, phenol resin, silicon resin, fluorine resin, etc.). In order to avoid moisture intrusion into the organic EL element, the support substrate made of these materials is further formed with an inorganic film, or coated with fluorine resin to perform moistureproof treatment or hydrophobic treatment. I want to be there.
- the moisture content and gas permeability coefficient of the support substrate in order to prevent moisture from entering the organic thin film layer, it is preferable to reduce the moisture content and gas permeability coefficient of the support substrate.
- the water content of 0.0001 wt% or less and the gas permeability coefficient 1 X 10- 13 '"117.111 2 ' 56 of the supporting substrate (: '(: 11113 ⁇ 4 like each be less.
- a glass substrate with a transparent electrode of 25 mm X 75 mm X 0.7 mm thick was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes and then UV ozone cleaning for 30 minutes.
- a glass substrate with a transparent electrode after cleaning is mounted on a substrate holder of a vacuum deposition apparatus, and a copper phthalocyanine film (10 nm thick) is first covered so that the transparent electrode is covered on the surface on which the transparent electrode is formed (Hereinafter abbreviated as “CuPc film”).
- This CuPc film functions as a hole injection layer.
- NPD film 4,4′-bis [N— (1-naphthyl) -Nphenylamino] biphenyl film (hereinafter abbreviated as “NPD film”) having a film thickness of 30 nm was formed on the CuPc film.
- This ex-NPD film functions as a hole transport layer.
- the above compound (H-1) is used as a host material, and at the same time as a phosphorescent Ir metal complex dopant, red luminescent bis (2-phenylisoquinoline) iridium acetylacetate shown below. Nart (hereinafter abbreviated as “(Ir (piq) (acac))”) was added and evaporated to form a light-emitting layer with a thickness of 30 nm.
- the concentration of Ir (piq) (acac) in the light emitting layer was 15% by weight. 10nm thickness on the light emitting layer
- BAlq film The following (1, 1, 1 bisphenol) -4-olato) bis (2-methyl-8 quinolinolato) aluminum (hereinafter abbreviated as “BAlq film”) was deposited.
- This BAlq film functions as a hole barrier layer.
- Alq film an aluminum complex of 8 hydroxyquinoline having a thickness of 40 nm (hereinafter abbreviated as “Alq film”) was formed on this film.
- Alq film functions as an electron injection layer.
- LiF which is an alkali metal halide was deposited to a thickness of 0.2 nm, and then aluminum was deposited to a thickness of 150 nm.
- This AlZLiF functions as a cathode. like this
- Example 1 (2) an organic EL device was prepared in the same manner except that the compound (H-2) obtained instead of the compound (H-1) was used as the host material of the light-emitting layer. did.
- Table 1 shows the results of conducting an energization test and evaluating the life of the obtained organic EL device in the same manner as in Example 1.
- Example 1 (2) it was obtained instead of the compound (H-1) as the host material of the light emitting layer.
- An organic EL device was produced in the same manner except that the obtained composite (H-3) was used.
- Table 1 shows the results of conducting an energization test and evaluating the life of the obtained organic EL device in the same manner as in Example 1.
- Example 1 (2) as the dopant of the light emitting layer, an orange color was used instead of Ir (piq) (acac).
- An organic EL device was produced in the same manner except that the above Ir (pq) (acac) was used.
- Table 1 shows the results of conducting an energization test and evaluating the life of the obtained organic EL device in the same manner as in Example 1.
- Example 1 an organic EL device was produced in the same manner except that the following CBP was used instead of the compound (H-1) as the host material in the light emitting layer.
- Table 1 shows the results of conducting an energization test and evaluating the life of the obtained organic EL device in the same manner as in Example 1. As shown in Table 1, the organic EL device of Comparative Example 2 had a short lifetime and was impractical.
- the organic EL devices of Examples 1 to 4 are widely used as phosphorescent materials in Comparative Example 1 by forming a light emitting layer as a condensed ring-containing compound and a host material. Compared with the case where the light emitting layer is formed using the known compound CBP as a host material, a remarkable effect that the lifetime is 2-3 times is obtained.
- the organic EL device using the fused ring-containing compound of the present invention is practical because it has high luminous efficiency and heat resistance and has a very long life.
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Abstract
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Also Published As
Publication number | Publication date |
---|---|
CN101052636A (zh) | 2007-10-10 |
EP1808433A4 (en) | 2009-04-15 |
JP2006131519A (ja) | 2006-05-25 |
TW200624536A (en) | 2006-07-16 |
KR20070073868A (ko) | 2007-07-10 |
US20090091240A1 (en) | 2009-04-09 |
EP1808433A1 (en) | 2007-07-18 |
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