WO2005030901A1 - 有機電界発光素子 - Google Patents
有機電界発光素子 Download PDFInfo
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- WO2005030901A1 WO2005030901A1 PCT/JP2004/013752 JP2004013752W WO2005030901A1 WO 2005030901 A1 WO2005030901 A1 WO 2005030901A1 JP 2004013752 W JP2004013752 W JP 2004013752W WO 2005030901 A1 WO2005030901 A1 WO 2005030901A1
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- H05B33/00—Electroluminescent light sources
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- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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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
- C09K2211/185—Metal complexes of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
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- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/917—Electroluminescent
Definitions
- the present invention relates to an organic electroluminescent device, and more particularly, to a thin film device that emits light by applying an electric field to a light emitting layer made of an organic compound.
- organic EL devices electroluminescent devices using organic materials
- organic EL devices have been developed by optimizing the types of electrodes with the aim of improving the efficiency of charge injection from the electrodes, and by using a hole transport layer made of an aromatic diamine.
- a light-emitting layer which also has 8-hydroxyquinoline-aluminum complex power, is provided between the electrodes as a thin film
- conventional single crystals of anthracene and the like have been developed. Since the luminous efficiency has been greatly improved compared to the crystal-based device, it has been pursued for practical use as a high-performance flat panel with self-luminous characteristics and high-speed response. .
- the configuration of the anode Z, the hole transport layer Z, and the light emitting layer / cathode is basically used.
- a structure having a light-emitting layer, a Z electron transport layer, an electron injection layer, a cathode, and the like is known.
- the hole transport layer has a function of transmitting holes injected from the hole injection layer to the light emitting layer
- the electron transport layer has a function of transmitting electrons injected from the cathode to the light emitting layer.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-352957
- Patent Document 2 Japanese Patent Application Laid-Open No. 2001-230079
- Patent Document 3 JP 2001-313178 A
- Patent Document 4 JP-A-2003-45611
- Patent Document 5 JP-A-2002-158091
- Non-Patent Document 1 Nature, vol.395, pl51, 1998
- Non-Patent Document 2 Appl.Phys. Lett., Vol. 75, p4, 1999
- Non-Patent Document 1 reported that highly efficient red light emission was possible by using a platinum complex (PtOEP). Thereafter, in Non-Patent Document 2, the efficiency of green light emission is greatly improved by doping the light emitting layer with an iridium complex (Ir (Ppy) 3). Furthermore, it has been reported that these iridium complexes exhibit extremely high emission efficiency even when the device structure is simplified by optimizing the light emitting layer.
- PtOEP platinum complex
- Ir (Ppy) 3 an iridium complex
- the main cause of the above drive deterioration is the substrate Z anode Z hole transport layer Z light emitting layer Z hole blocking layer
- the deterioration of the thin film shape of the light emitting layer in a device structure such as the Z electron transport layer Z cathode or the substrate Z anode Z hole transport layer Z light emitting layer Z electron transport layer Z cathode.
- the deterioration of the thin film shape is attributed to the crystallization (or aggregation) of the organic amorphous thin film due to heat generation during element driving, etc., and the low heat resistance is due to the low glass transition temperature (Tg) of the material. It is rejected if it comes from.
- Non-Patent Document 2 a carbazole derivative (CBP) or a triazole is used as a light emitting layer.
- the compound (TAZ) is used, and the phenantophore phosphorus derivative (HB-1) is used as the hole blocking layer.
- These compounds are easily crystallized and aggregated because of their high symmetry and low molecular weight.
- Tg is difficult to observe even due to its high crystallinity.
- Such instability of the shape of the thin film in the light emitting layer has the adverse effect of shortening the driving life of the device and lowering the heat resistance.
- the organic electroluminescent device using phosphorescence actually has a large problem in driving stability of the device.
- Patent Document 1 discloses that a compound having an oxazidazole group is used as a host agent in an organic EL device in which a light emitting layer contains a host agent and a dopant emitting phosphorescence.
- Patent Document 2 discloses an organic EL device having a thiazole structure or a pyrazole structure in an organic layer.
- Patent Document 3 discloses an organic EL device having a light emitting layer containing a phosphorescent iridium complex compound and a carbazole derivative.
- Patent Document 4 discloses an organic EL device having a light-emitting layer containing a carbazole derivative (PVK), a compound having an oxadiazole group (PBD), and an iridium complex derivative (Ir (ppy) 3). Have been.
- Patent Document 5 proposes an orthometalated metal and a porphyrin metal complex as a phosphorescent compound. However, these also have the problems described above.
- Patent Document 2 discloses an organic EL device using phosphorescence.
- an object of the present invention is to provide an organic EL device having high efficiency and high driving stability.
- the present invention is an organic electroluminescent device in which an anode, an organic layer, and a cathode are stacked on a substrate, wherein at least one organic layer is a light emitting layer containing a host agent and a dopant, and
- An organic electroluminescent device characterized by using a pyrazole-based compound having 2 to 4 pyrazole structures represented by the following formula I in the same molecule as a host agent.
- pyrazole-based compound a compound represented by the following formula II is preferably mentioned.
- Ar—Ar is independently hydrogen or an optionally substituted substituent.
- X represents an aromatic hydrocarbon group, and X represents a divalent aromatic hydrocarbon group which may have a direct bond or a substituent.
- Examples of the doping agent preferably include those containing at least one metal complex selected from a phosphorescent orthometallic metal complex and a porphyrin metal complex.
- a metal complex containing an organometallic complex containing at least one metal selected from Group 7 to Group 11 of the periodic table is preferable.
- a metal selected from ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum and gold is preferably exemplified.
- the organic electroluminescent device of the present invention also advantageously has a hole blocking layer between the light emitting layer and the cathode, or an electron transport layer between the light emitting layer and the cathode.
- the organic electroluminescent device (organic EL device) of the present invention has at least one organic layer between an anode and a cathode provided on a substrate, and at least one of the organic layers is a light emitting layer.
- the light emitting layer contains a specific host agent and a dopant emitting phosphorescence.
- a host agent is a main component, and a doping agent is included as a sub component.
- the main component means a material occupying 50% by weight or more of the material forming the layer, and the subcomponent refers to other components.
- the host compound is a phosphorescent compound. It has an excited triplet level in an energy state higher than the excited triplet level of the dopant.
- the host agent contained in the light emitting layer of the present invention is a compound that gives a stable thin film shape, has a high glass transition temperature (Tg), and can efficiently transport holes, Z, or electrons. It is necessary to Further, the compound is required to be a compound that is electrochemically and chemically stable, and hardly generates impurities that act as traps or quench light emission during production or use.
- a pyrazole-based compound having a pyrazole structure represented by the above-mentioned formula I is used as a compound which satisfies the above requirements.
- one of the requirements for providing a stable thin film shape as a host material is an appropriate molecular weight.
- an organic EL device using this material is generally formed by vacuum evaporation.
- an organic compound having an unnecessarily large molecular weight requires excessive energy for evaporation, and is decomposed rather than vaporized. Prioritize.
- the number of pyrazole structures is preferably up to about four, more preferably two.
- Preferable examples include a 133-ring aromatic hydrocarbon group, which may have a substituent.
- the number of substituents is preferably in the range of 0-3.
- Preferable examples of the aromatic hydrocarbon group include a 113-ring aryl group such as a phenyl group, a naphthyl group, and an anthracyl group. These groups can have a substituent.
- Examples of the substituent include a lower alkyl group having 16 to 16 carbon atoms such as a methyl group and an ethyl group, a lower alkyl group having 6 to 12 carbon atoms such as a phenyl group and a methylphenyl group.
- an aryl group of More preferably, the substituent is an alkyl group having 13 to 13 carbon atoms.
- Ar is an aromatic hydrocarbon group
- Ar or 1 or 2 of Ar is an aromatic hydrocarbon group
- Artv is an aromatic hydrocarbon group
- Ar is water
- aromatic hydrocarbon groups include phenyl, naphthyl, methylphenyl, methylnaphthyl, and phenylphenol.
- Ar and are a phenyl group Ar is a hydrogen or phenyl group, and X is a phenyl group.
- a compound which is a 1231 dilene group is preferred and may be present.
- aromatic hydrocarbon groups are preferred. Phenyl, 2-methylphenyl, 3-methylphenyl, 4-methylphenyl, 2,4-dimethylphenyl, 3,4_dimethylphenyl, 2,4,5_ Trimethylphenyl, 4-ethylphenyl, 4-tert-butylphenyl, 1-naphthyl, 2-naphthyl, 1-anthracyl, 2_anthracyl, 9-anthracyl And 9-fence rail. Note that Ar-Ar
- X represents a divalent aromatic hydrocarbon group which may have a direct bond or a substituent.
- a trivalent divalent aromatic hydrocarbon ring group specifically, a 1,4-phenylene group, a 1,3-phenylene group, a 1,4-naphthylene group, Examples thereof include a 1,5-naphthylene group, a 2,6-naphthylene group, a 3,3'-biphenylene group, a 4,4-diphenylene group, and a 9,10-anthracelene group.
- the substituent include an alkyl group having 1 to 16 carbon atoms. More preferred X is
- crystallinity is determined by the symmetry (planarity) of the molecular structure and the intermolecular interaction of polar groups. It is thought that it is governed by actions.
- the pyrazole compound used in the present invention has an aromatic group at the 1, 3- or 4-position of the pyrazole ring, thereby preventing the molecular structure from becoming flat and suppressing crystallinity.
- a bulky aromatic group around a strongly polar nitrogen atom, an effect of suppressing intramolecular interaction is derived.
- the organic EL device of the present invention contains an auxiliary component, that is, a phosphorescent dopant in the light emitting layer.
- the doping agent known phosphorescent metal complex compounds described in the above-mentioned patent documents and non-patent documents can be used, and the central metal force of those metal complexes is preferably a metal selected from groups 7 to 11 of the periodic table. And a phosphorescent organometallic complex.
- the metal include metals selected from ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum and gold.
- the dopant and the metal may be one kind or two or more kinds.
- the phosphorescent dopant is preferably an orthometallic metal complex or a porphyrin metal complex, which is preferably a phosphorescent luminescent metal complex or a porphyrin metal complex. It is known as such. Therefore, these known phosphorescent dopants can be widely used.
- Preferred organometallic complexes include Ir (bt) 2 having a noble metal element such as Ir as a central metal.
- AC complexes such as ac3 (Formula A), Ir (P P y ) complexes such as 3 (Formula B), include complexes such as PtOEt3 (Formula C) is. Specific examples of these complexes are shown below. The compounds are not limited to the following compounds.
- FIG. 1 is a schematic view showing a layer structure of an organic EL device.
- FIG. 1 is a cross-sectional view schematically showing an example of the structure of a general organic EL element used in the present invention, wherein 1 is a substrate, 2 is an anode, 3 is a hole injection layer, 4 is a hole transport layer, 5 Represents a light emitting layer, 6 represents a hole blocking layer, 7 represents an electron transport layer, and 8 represents a cathode.
- the hole injection layer 3-the electron transport layer 7 are organic layers
- the organic EL device of the present invention has one or more organic layers including the light emitting layer 5. It is advantageous to have three or more, more preferably five or more organic layers including the light-emitting layer 5.
- FIG. 1 is an example, and one or more layers may be added to this, and one or more layers may be omitted.
- the substrate 1 serves as a support for the organic EL element, and is made of a quartz or glass plate, a metal plate or metal foil, a plastic film or sheet, or the like.
- a glass plate or a plate of a transparent synthetic resin such as polyester, polymethacrylate, polycarbonate, and polysulfone is preferred.
- the gas nootropic force S of the substrate is too small, since the organic EL element may be deteriorated by the outside air passing through the substrate. For this reason, a method of providing a dense silicon oxide film on at least one side of the synthetic resin substrate to secure gas nori properties is also one of the preferable methods.
- Anode 2 plays a role of injecting holes into the hole transport layer.
- This anode is usually made of aluminum, gold, silver, nickel, metal such as radium and platinum, metal oxide such as indium and Z or tin oxide, metal halide such as copper iodide, It is composed of carbon black or a conductive polymer such as poly (3-methylthiophene), polypyrrole, or polyaline.
- the formation of the anode 2 is usually performed by a sputtering method, a vacuum evaporation method, or the like in many cases.
- the anode 2 can also be formed by coating on 1. Furthermore, in the case of conductive polymer, electrolytic A thin film can be formed directly on the substrate 1 by polymerization, or the anode 2 can be formed by applying a conductive polymer on the substrate 1. The anode 2 can be formed by laminating different materials. The thickness of the anode 2 depends on the required transparency. When transparency is required, the transmittance of visible light is usually 60% or more, preferably 80% or more.
- the thickness is usually 5 to 1000 nm, preferably 10 to 1000 nm. — About 500nm. If opaque, the anode 2 may be the same as the substrate 1. Further, it is also possible to laminate a different conductive material on the anode 2.
- the hole injection layer 3 is inserted between the hole transport layer 4 and the anode 2 for the purpose of improving the efficiency of hole injection and improving the adhesion of the entire organic layer to the anode. Things have also been done.
- the insertion of the hole injection layer 3 has the effect of reducing the initial drive voltage of the device and suppressing the voltage rise when the device is continuously driven with a constant current.
- the conditions required for the material used for the hole injection layer are that the contact with the anode is good, a uniform thin film can be formed, and the material is thermally stable, that is, the melting point and the glass transition temperature are high. As described above, a glass transition temperature of 100 ° C or more is required. Further, the ion implantation potential is low and the hole injection from the anode is easy, and the hole mobility is high.
- phthalocyanine compounds such as copper phthalocyanine, organic compounds such as polyaniline and polythiophene, sputtered carbon films, vanadium oxide, ruthenium oxide, molybdic acid Metallic stilts such as stilts have been reported.
- anode buffer layer a thin film can be formed in the same manner as the hole transport layer.
- a sputtering method, an electron beam evaporation method, and a plasma CVD method are further used.
- the thickness of the hole injection layer 3 formed as described above is usually 3 to 100 nm, preferably 5 to 50 nm.
- the hole transport layer 4 is provided on the hole injection layer 3.
- the conditions required for the material used in the hole transport layer include a material having high hole injection efficiency from the hole injection layer 3 and capable of efficiently transporting the injected holes. It is necessary. For this purpose, the ionization potential is small, the transparency is high for visible light, the hole mobility is large, the hole mobility is large, and the stability is high, and impurities serving as traps are less likely to be generated during production or use. Is required. Further, it is required that the light emission of the light emitting layer is not quenched in order to come into contact with the light emitting layer 5 or that an exciplex is formed between the light emitting layer and the light emitting layer to reduce the efficiency. In addition to the above general requirements, when considering applications for in-vehicle display, the element is required to have further heat resistance. Therefore, a material having a Tg of 90 ° C or more is desirable.
- Examples of such a hole transporting material include two or more tertiary compounds represented by 4,4'-bis [N- (l-naphthyl) -N-phenylamino] biphenyl.
- Aromatic compounds having a starburst structure such as aromatic diamines containing at least two condensed aromatic rings substituted with nitrogen atoms, and 4,4 ', 4 "-tris (1-naphthylphenylamino) triphenylamine
- Aminy conjugates, aromatic amine compounds having tetramer strength of triphenylamine, and spiro compounds such as 2,2 ', 7,7'-tetrakis- (diphenylamino) -9,9'-spirobifluorene are known. These compounds may be used alone or as a mixture.
- examples of the material of the hole transport layer 4 include polymer materials such as polyvinyl carbazole, polyvinyl triphenylamine, and polyarylene ether sulfone containing tetraphenylbenzidine.
- the coating method one or more hole transport materials and, if necessary, additives such as a binder, a resin, and a coating improver which do not trap holes are added and dissolved.
- a solution is prepared, applied on the anode 2 or the hole injection layer 3 by a method such as spin coating, and dried to form the hole transport layer 4.
- examples of the binder resin include polycarbonate, polyarylate, and polyester. If the binder resin is added in a large amount, the hole mobility is reduced. Therefore, the smaller the amount, the more preferable the binder resin is usually 50% by weight or less.
- the light emitting layer 5 is provided on the hole transport layer 4.
- the light-emitting layer 5 contains the host agent and a dopant that emits phosphorescence, and is injected from an anode between electrodes to which an electric field is applied and is positively injected. It emits strong light when excited by recombination of holes moving through the hole transporting layer and electrons injected from the cathode and moving through the electron transporting layer 7 (or the hole blocking layer 6).
- the light-emitting layer 5 may contain other components such as a host material and a fluorescent dye other than the host material used as an essential component in the present invention, as long as the performance of the present invention is not impaired.
- the conditions required for the material used for the light emitting layer host agent are that the hole injection efficiency from the hole transport layer 4 is high and the electron injection layer 7 (or the hole blocking layer 6) High electron injection efficiency is required.
- the ionization potential has an appropriate value, the force is large, the mobility of holes * electrons is large, the electrical stability is excellent, and impurities serving as traps are unlikely to be generated during production or use. You. Further, it is required that exciplexes are not formed between the adjacent hole transport layer 4 and the electron transport layer 7 (or the hole blocking layer 6) to reduce the efficiency.
- the element is required to have further heat resistance. Therefore, a material having a Tg value of 80 ° C or more is desirable.
- the amount contained in the light emitting layer is preferably in the range of 0.1 to 30% by weight. If it is less than 0.1% by weight, it cannot contribute to the improvement of the luminous efficiency of the device. If it exceeds 30% by weight, concentration quenching such as formation of a dimer by the organometallic complex occurs, leading to a decrease in luminous efficiency. In a conventional device using fluorescence (singlet), it tends to be preferable that the amount is slightly larger than the amount of the fluorescent dye (dopant) contained in the light emitting layer.
- the organometallic complex may be partially contained in the light emitting layer in the thickness direction or may be unevenly distributed.
- the thickness of the light emitting layer 5 is usually 10-20 Onm, preferably 20-100 nm.
- the light emitting layer 5 is advantageously formed by a vacuum evaporation method.
- Host agent put both dopants in the installed crucible in a vacuum vessel, after evacuating to about 10- 4 Pa with a suitable vacuum pump vacuum vessel, and heating the crucible, the host agent, the doping agent Are simultaneously evaporated to form on the hole transport layer 4.
- the content of the dopant in the host agent is controlled while monitoring the deposition rate separately for the host agent and the dopant.
- the hole blocking layer 6 is laminated on the light emitting layer 5 so as to be in contact with the interface of the light emitting layer 5 on the cathode side, but the hole moving from the hole transport layer reaches the cathode.
- the role of blocking the cathode Force It is formed from a compound that can efficiently transport injected electrons toward the light emitting layer.
- the physical properties required of the material constituting the hole blocking layer include a high electron mobility and a low hole mobility.
- the hole blocking layer 6 has a function of confining holes and electrons in the light emitting layer and improving luminous efficiency.
- the electron transport layer 7 is formed of a compound capable of efficiently transporting electrons injected from the cathode between the electrodes to which an electric field is applied, in the direction of the hole blocking layer 6.
- the electron transporting compound used for the electron transporting layer 7 is a compound having a high electron injection efficiency from the cathode 8 and a high electron mobility and capable of efficiently transporting injected electrons. It is necessary to have something.
- Materials satisfying such conditions include an aluminum complex of 8-hydroxyquinoline (
- Metal complexes such as Alq3), metal complexes of 10-hydroxybenzo [h] quinoline, oxaziazol derivatives, distyrylbifur derivatives, silole derivatives, 3_ or 5_hydroxyflavon metal complexes, benzoxazole metal complexes, Benzothiazole metal complex, trisbenzimidazolylbenzene, quinoxaline compound, phenanthroline derivative, 2-t-butyl-9,10- ⁇ , ⁇ '-dicyanantraquinonedimine, ⁇ -type hydrogenated amorphous silicon carbide, ⁇ -type zinc sulfide, ⁇ -type zinc selenide and the like can be mentioned.
- the thickness of the electron transport layer 7 is usually 5 to 200 nm, preferably 10 to 100 nm.
- the electron transport layer 7 is formed by laminating on the hole blocking layer 6 by a coating method or a vacuum deposition method in the same manner as the hole transport layer 4. Usually, a vacuum evaporation method is used.
- the cathode 8 plays a role of injecting electrons into the light emitting layer 5.
- the material used for the cathode 8 can be the material used for the anode 2.
- tin, magnesium, indium, calcium, and the like which are preferred by metals having a low work function, are used.
- a suitable metal such as aluminum, silver, or the like, or an alloy thereof is used.
- Specific examples include low work function alloy electrodes such as magnesium silver alloy, magnesium indium alloy, and aluminum lithium alloy.
- inserting an ultra-thin insulating film (0.1-5 layer) of LiF, MgF, Li0, etc. at the interface between the cathode and the electron transport layer also improves the efficiency of the device.
- the thickness of the cathode 8 is usually the same as that of the anode 2.
- a metal having a high work function and stable against the atmosphere is further added. Laminating metal layers increases the stability of the device. For this purpose, metals such as aluminum, silver, copper, nickel, chromium, gold and platinum are used.
- a cathode 8 a hole blocking layer 6, a light emitting layer 5, a hole transporting layer 4, and an anode 2 on a substrate 1 in that order, or a substrate 1Z cathode 8Z electron transport Layer 7Z hole blocking layer 6Z light emitting layer 5Z hole transport layer 4Z hole injection layer 3Z anode 2 It is also possible to laminate in this order.
- a 300 ml four-necked flask was charged with 10.9 g (0.27 mol) of sodium hydroxide, 52.7 g of ethanol and 98.3 g of ion-exchanged water. After stirring at room temperature for 10 minutes to dissolve sodium hydroxide, 26.1 g (0.22 mol) of acetophenone was added. Thereafter, the mixture was cooled with ice water, and 14.1 g (0.11 mol) of terephthalaldehyde was added. After the addition, heating and stirring was continued under reflux for 4 hours. After the completion of the reaction, the mixture was cooled to room temperature, and the solid content was collected by filtration.
- PBP 5,5 '-(l, 4-phenylene) bis [l, 3-diphenyl -1H-pyrazole]
- BPPP 4,4, -bis (1,3-diphenyl).
- BPPP -Ru-5-pyrazole diphenyl
- BPN (1,3-diphenyl-5-pyrazole) naphthalene
- 4-Ph-PBP 5,5,-(1,4-phenylene) bis (1,3,4-triphenyl-1H-pyrazole)
- 4-Ph-PBP is a compound of No. llO.
- Tg The glass transition temperature (Tg) was measured by DSC measurement on the heat resistance of the compound as a candidate for the main component of the light-emitting layer (host material).
- TAZ is 3-phenyl-4- (1'-naphthyl) -5-phenyl-1,2,4-triazole
- CBP is 4,4, -N, N, -dicarbazolediphenyl
- BCP is 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline
- OXD-7 is 1,3-bis [(4- 1-butylphenyl) -1,3,4-oxadiazolyl] Phenyl is an abbreviation for each known host material. Table 12 shows the results.
- an organic EL device having a layer structure in which the hole injection layer 3 and the hole blocking layer 6 were omitted was manufactured as follows.
- ITO Indium 'stannate
- Diomatec Co., Ltd. is patterned on a glass substrate 1 to form a 2 mm-wide stripe to form an anode 2, which is washed with pure water and washed with pure water.
- the substrate was dried by nitrogen blowing, and finally, was subjected to ultraviolet ozone cleaning and set in a vacuum evaporation apparatus.
- PBP as the main component of the light-emitting layer
- tris (2-phenylpyridine) iridium complex (Ir (ppy)) as the phosphorescent organometallic complex were simultaneously deposited from different deposition sources by a binary simultaneous vapor deposition method.
- the light emitting layer 5 was formed to have a thickness of 25 nm. At this time, the concentration of Ir (ppy) was 7 wt%.
- Alq was formed to a thickness of 5 Onm.
- the above-mentioned element is once taken out of the apparatus into the atmosphere, and used as a mask to be worn on the cathode.
- a 2 mm wide stripe-shaped shadow mask was placed in a separate vacuum apparatus with the elements adhered so as to be orthogonal to the ITO stripes of the anode 2.
- Evacuation was performed in the same manner as in the organic layer, and 170 nm of aluminum was vapor-deposited on the electron transport layer using lithium fluoride (LiF) as a 0.5 cathode as an electron injection layer.
- LiF lithium fluoride
- An organic EL device was prepared in the same manner as in Example 1, except that PBNP was used as the main component of the light emitting layer 5. It was confirmed that Ir (ppy) light emission was obtained from this organic EL device.
- An organic EL device was prepared in the same manner as in Example 1 except that BPPP was used as the main component of the light emitting layer 5.
- Table 14 shows the device characteristics.
- An organic EL device was prepared in the same manner as in Example 1 except that BPN was used as the main component of the light-emitting layer 5. It was confirmed that the organic EL element emitted light with Ir (ppy) power.
- An organic EL device was prepared in the same manner as in Example 1, except that 4-Ph-PBP was used as the main component of the light emitting layer 5.
- Table 14 shows the device characteristics.
- An organic electroluminescent device was prepared in the same manner as in Example 1 except that TAZ was used as a main component of the light emitting layer. Table 14 shows the device characteristics.
- the present invention provides an organic electroluminescent device that has improved luminous efficiency of an organic electroluminescent device using phosphorescence, and has improved driving stability and heat resistance, and has improved applicability to a display device such as a flat panel display or illumination.
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- Electroluminescent Light Sources (AREA)
Description
Claims
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JP2005514185A JP4633629B2 (ja) | 2003-09-29 | 2004-09-21 | 有機電界発光素子 |
US10/573,786 US7582364B2 (en) | 2003-09-29 | 2004-09-21 | Organic electroluminescent device |
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JP (1) | JP4633629B2 (ja) |
KR (1) | KR101026602B1 (ja) |
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Cited By (2)
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JP2007266458A (ja) * | 2006-03-29 | 2007-10-11 | Fujifilm Corp | 有機電界発光素子 |
JP2012104525A (ja) * | 2010-11-05 | 2012-05-31 | Sony Corp | 有機el表示装置およびその製造方法 |
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JP2006140444A (ja) * | 2004-10-14 | 2006-06-01 | Tohoku Pioneer Corp | 自発光表示装置及びその製造方法 |
JP4811314B2 (ja) * | 2007-03-27 | 2011-11-09 | セイコーエプソン株式会社 | 有機elデバイス |
KR20100058563A (ko) * | 2007-08-17 | 2010-06-03 | 조지아 테크 리서치 코오포레이션 | 이리듐 착화합물을 포함한 노보넨계 공중합체 |
US8203984B2 (en) | 2008-12-19 | 2012-06-19 | Intel Corporation | Power management for wireless networks |
KR102625861B1 (ko) | 2016-06-28 | 2024-01-17 | 삼성디스플레이 주식회사 | 헤테로시클릭 화합물 및 이를 포함한 유기 발광 소자 |
WO2018135656A1 (ja) * | 2017-01-23 | 2018-07-26 | 三菱ケミカル株式会社 | 発光層形成用組成物及び該発光層形成用組成物を含有する有機電界発光素子 |
CN109119541A (zh) * | 2017-06-26 | 2019-01-01 | 东丽先端材料研究开发(中国)有限公司 | 量子点发光元件 |
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EP2224790B1 (en) * | 2000-07-17 | 2013-01-02 | UDC Ireland Limited | Light emitting element and azole compound |
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- 2004-09-21 WO PCT/JP2004/013752 patent/WO2005030901A1/ja active Application Filing
- 2004-09-21 CN CNB200480028206XA patent/CN100460480C/zh not_active Expired - Fee Related
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JP2001230079A (ja) * | 2000-02-18 | 2001-08-24 | Fujitsu Ltd | 有機エレクトロルミネッセンス素子 |
JP2002100476A (ja) * | 2000-07-17 | 2002-04-05 | Fuji Photo Film Co Ltd | 発光素子及びアゾール化合物 |
JP2002305084A (ja) * | 2000-12-25 | 2002-10-18 | Fuji Photo Film Co Ltd | 新規インドール誘導体およびそれを利用した発光素子 |
JP2003109767A (ja) * | 2001-07-25 | 2003-04-11 | Toray Ind Inc | 発光素子 |
JP2003229275A (ja) * | 2001-11-27 | 2003-08-15 | Semiconductor Energy Lab Co Ltd | 発光素子 |
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JP2007266458A (ja) * | 2006-03-29 | 2007-10-11 | Fujifilm Corp | 有機電界発光素子 |
JP2012104525A (ja) * | 2010-11-05 | 2012-05-31 | Sony Corp | 有機el表示装置およびその製造方法 |
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KR101026602B1 (ko) | 2011-04-04 |
TWI347799B (ja) | 2011-08-21 |
CN100460480C (zh) | 2009-02-11 |
US20070012935A1 (en) | 2007-01-18 |
US7582364B2 (en) | 2009-09-01 |
JP4633629B2 (ja) | 2011-02-16 |
TW200514471A (en) | 2005-04-16 |
JPWO2005030901A1 (ja) | 2006-12-07 |
CN1860201A (zh) | 2006-11-08 |
KR20060090820A (ko) | 2006-08-16 |
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