Patents by Inventor Atsushi Tokuda
Atsushi Tokuda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7112113Abstract: A method for manufacturing a display device of the present invention includes the steps of forming insulating barriers which surround electrode and project upward from the surface of the electrode, and bringing the whole substrate into contact with water after applying the solution including an acceptor in wet process. According to the present invention, an organic conductive layer can be uniformly formed over a substrate in wet process even if the substrate does not have a smooth surface and has distribution in wettability of the surface.Type: GrantFiled: December 17, 2003Date of Patent: September 26, 2006Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventor: Atsushi Tokuda
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Patent number: 7097916Abstract: A chelate complex having as its central metal tungsten which is an inexpensive metal and which is a heavy atom is applied to an organic light emitting element, thereby obtaining an organic light emitting element capable of converting the triplet excitation energy into light emission. By applying the organic light emitting element using this metal complex, an inexpensive light emitting device which is bright but consumes little power can be provided as well as an electric appliance using the light emitting device.Type: GrantFiled: April 15, 2002Date of Patent: August 29, 2006Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Atsushi Tokuda, Yasuo Nakamura
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Patent number: 7078114Abstract: A phosphorescent compound is formed by synthesizing an orthometallated complex by using easily-synthesized ligands. An electroluminescent device having high luminous efficiency uses the phosphorescent compound. Moreover, a light-emitting device operating at a low voltage uses the electroluminescent device. A phosphorescent compound represented by general formula [formula 1] is synthesized. Further, an electroluminescent device containing the phosphorescent compound is formed. In order to generate phosphorescent emission more efficiently, a heavy metal is preferably used as a central metal from the perspective of heavy atom effects.Type: GrantFiled: November 21, 2003Date of Patent: July 18, 2006Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Hideko Inoue, Atsushi Tokuda, Ryoji Nomura
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Publication number: 20060128974Abstract: The present invention is directed to a novel phosphorescent compound formed by synthesizing an orthometallated complex by using easily-synthesized ligands. The invention is further directed to an electroluminescent device having high luminous efficiency by using the phosphorescent compound. Moreover, the invention is also directed to a light-emitting device operating at a low voltage by using the electroluminescent device. According to the present invention, a phosphorescent compound represented by general formula [formula 1] is synthesized. Further, an electroluminescent device containing the phosphorescent compound is formed. In order to generate phosphorescent emission more efficiently, a heavy metal is preferably used as a central metal from the perspective of heavy atom effects. Therefore, one feature of the present invention is that the central metal M in the below general formula [formula 1] is iridium or platinum.Type: ApplicationFiled: January 30, 2006Publication date: June 15, 2006Inventors: Satoshi Seo, Hideko Inoue, Atsushi Tokuda, Ryoji Nomura
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Publication number: 20060106211Abstract: Organometal complexes which are obtainable with a good yield by using a ligand which can be easily synthesized are provided. The organometal complexes are excellent in heat resistance. An electroluminescence element having high light emission efficiency is manufactured using the organometal complex. Therefore, the organometal complex represented by the general formula (1) is synthesized. Further, this is applied to the electroluminescence element.Type: ApplicationFiled: December 28, 2005Publication date: May 18, 2006Inventors: Satoshi Seo, Hideko Inoue, Atsushi Tokuda
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Patent number: 7041390Abstract: Organometal complexes which are obtainable with a good yield by using a ligand which can be easily synthesized are provided. The organometal complexes are excellent in heat resistance. An electroluminescence element having high light emission efficiency is manufactured using the organometal complex. Therefore, the organometal complex represented by the general formula (1) is synthesized. Further, this is applied to the electroluminescence element.Type: GrantFiled: February 12, 2004Date of Patent: May 9, 2006Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Hideko Inoue, Atsushi Tokuda
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Patent number: 6998492Abstract: Organometallic complexes represented by chemical formula 1 are synthesized. In chemical formula 1, R1 to R5, are individually a hydrogen atom, a halogen atom, a lower alkyl group, an alkoxy group, an acyl group, a nitro group, a cyano group, an amino group, a dialkylamino group, a diarylamino group, a vinyl group, an aryl group, or a heterocyclic group. Each pair of R1 and R2, R2 and R3, and R4 and R5 may be bonded each other to form aromatic rings. Y is a heterocyclic group containing nitrogen atoms as hetero atoms. M is atoms of group 9 in the periodic table or atoms of group 10 in the periodic table. When the M is atoms of group 9 in the periodic table, n=2. When the M is atoms of group 10 in the periodic table, n=1. L is a monoanionic bidentate chelate ligand having a beta diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenol hydroxyl group.Type: GrantFiled: May 6, 2004Date of Patent: February 14, 2006Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Atsushi Tokuda, Hideko Inoue
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Publication number: 20050186446Abstract: Target is to provide an organic compound material having a bipolar character. A quinoxaline derivative represented by a general formula (1) is provided. In the formula, R1-R12 each independently represents a hydrogen atom, a halogen atom, a lower alkyl group, an alkoxy group, an acyl group, a nitro group, a cyano group, an amino group, a dialkylamino group, a diarylamino group, a vinyl group, an aryl group, or a heterocyclic residue group. R9 and R10, R10 and R11, and R11 and R12 are each independent or respectively mutually bonded to form an aromatic ring. Ar1-Ar4 each independently represents an aryl group or a heterocyclic residue group. Ar1, Ar2, Ar3 and Ar4 are each independent or Ar1 and Ar2, and Ar3 and Ar4 are respectively mutually bonded directly, or Ar1 and Ar3, and Ar3 and Ar4 are bonded via oxygen (O), sulfur (S) or a carbonyl group.Type: ApplicationFiled: April 16, 2004Publication date: August 25, 2005Inventors: Satoko Shitagaki, Atsushi Tokuda, Hiroko Abe, Ryoji Nomura, Satoshi Seo
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Publication number: 20050112400Abstract: (Object) The present invention provides a novel phosphorescent compound by synthesizing an orthometallated complex by using easy-synthesized ligands. Further, the invention provides an electroluminescent device having high luminous efficiency by using the phosphorescent compound. Moreover, the invention provides a light-emitting device operating at a low voltage by using the electroluminescent device. (Solution Method) According to the invention, a phosphorescent compound represented by general formula [formula 1] is synthesized. Further, an electroluminescent device containing the phosphorescent compound is formed. In order to generate phosphorescent emission further efficiently, a heavy metal is preferably used as a central metal from the perspective of heavy atom effects. Therefore, one feature of the present invention is that the central metal M in the foregoing general formula [formula 1] is iridium or platinum.Type: ApplicationFiled: November 21, 2003Publication date: May 26, 2005Inventors: Satoshi Seo, Hideko Inoue, Atsushi Tokuda, Ryoji Nomura
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Publication number: 20050095455Abstract: It is an object to provide a light-emitting organic compound that is superior in chemical stability, chemical stability, and thermal stability. In addition, it is also an object to provide a material that shows blue luminescence with favorable color purity. For the objects, the present invention provides a light-emitting organic compound represented by the following general formula (1). In the formula, X1 represents a silyl group in which one or more aryl groups having 5 to 10 carbon atoms are bound to silicon or an alkyl group having 1 to 4 carbon atoms. Ar1 represents an unsubstituted or substituted aryl group having 5 to 15 carbon atoms. Ar2 represents an aryl group having 5 to 20 carbon atoms, and may have a substituent at a site different from a binding site to Ar1.Type: ApplicationFiled: July 26, 2004Publication date: May 5, 2005Inventors: Ryoji Nomura, Atsushi Tokuda, Hiroko Abe, Satoshi Seo
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Publication number: 20050079385Abstract: It is an object of the present invention to provide a pyrene derivative that is unlikely to crystallize and is superior in quality in the case of forming a film. In addition, it is an object of the present invention to provide a light-emitting element from which stable light emission can be obtained for a long stretch of time by using the pyrene derivative. A pyrene derivative represented by the general formula (1) is synthesized. By using vacuum deposition to deposit this material, a light-emitting element from which stable light emission can be obtained efficiently for a long stretch of time can be obtained.Type: ApplicationFiled: October 1, 2004Publication date: April 14, 2005Inventors: Ryoji Nomura, Takako Takasu, Hiroko Abe, Atsushi Tokuda
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Publication number: 20050033054Abstract: Organometallic complexes represented by chemical formula 1 are synthesized. In chemical formula 1, R1 to R5, are individually a hydrogen atom, a halogen atom, a lower alkyl group, an alkoxy group, an acyl group, a nitro group, a cyano group, an amino group, a dialkylamino group, a diarylamino group, a vinyl group, an aryl group, or a heterocyclic group. Each pair of R1 and R2, R2 and R3, and R4 and R5 may be bonded each other to form aromatic rings. Y is a heterocyclic group containing nitrogen atoms as hetero atoms. M is atoms of group 9 in the periodic table or atoms of group 10 in the periodic table. When the M is atoms of group 9 in the periodic table, n=2. When the M is atoms of group 10 in the periodic table, n=1. L is a monoanionic bidentate chelate ligand having a beta diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenol hydroxyl group.Type: ApplicationFiled: August 25, 2004Publication date: February 10, 2005Inventors: Satoshi Seo, Atsushi Tokuda, Hideko Inoue
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Publication number: 20050006625Abstract: An object of the present invention is to provide novel organometal complexes which is obtainable with a good yield by using a ligand which can be easily synthesized. Particularly, it is intended to provide the organometal complexes which is excellent in heat resistance. Further, it is intended to provide an electroluminescence element having high light emission efficiency by manufacturing the electroluminescence element using the organometal complex. Therefore, the organometal complex represented by the general formula (1) is synthesized. Further, this is applied to the electroluminescence element.Type: ApplicationFiled: February 12, 2004Publication date: January 13, 2005Inventors: Satoshi Seo, Hideko Inoue, Atsushi Tokuda
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Publication number: 20040253368Abstract: A method for manufacturing a display device of the present invention comprises the steps of forming insulating barriers which surround electrode and project upward from the surface of the electrode, and bringing the whole substrate into contact with water after applying the solution including an acceptor in wet process. According to the present invention, an organic conductive layer can be uniformly formed over a substrate in wet process even if the substrate does not have a smooth surface and has distribution in wettability of the surface.Type: ApplicationFiled: December 17, 2003Publication date: December 16, 2004Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventor: Atsushi Tokuda
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Publication number: 20040241493Abstract: A white or whitish luminescent material for phosphorescence is provided by synthesizing an organometallic complex that is able to convert a triplet excited state into light emission. In particular, a white electroluminescent device that has a high luminous efficiency and can be manufactured easily is provided by using the organometallic complex to manufacture a white or whitish electroluminescent device. The electroluminescent device is used to provide a light-emitting device with low power consumption. A fluorescent and phosphorescent material represented by a general formula (2) is synthesized. Since this material can emit both components of fluorescence and phosphorescence in the region of visible light, white or whitish luminescence can be achieved, which is applied to an electroluminescent device or a light-emitting device.Type: ApplicationFiled: December 17, 2003Publication date: December 2, 2004Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hideko Inoue, Satoshi Seo, Atsushi Tokuda, Ryoji Nomura
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Publication number: 20040241492Abstract: An EL element is provided in which a conjugate polymer that has a polythiophene derivative, a polyaniline derivative, a polypyrrole derivative or a polyfuran derivative as a fundamental skeleton and is soluble in an organic solvent is oxidized in its main chain with a dopant of an electron-accepting organic molecule that does not contain an acid component, and the doped conjugate polymer is used as a material to form a hole injecting layer. The polymer, being soluble in an organic solvent, can be formed in film even on a substrate high in the water repellency; that is, it can be easily formed in film on a TFT substrate and the like indispensable for an active matrix display device. Furthermore, since a dopant that does not contain an acid component is used, influence on an organic thin film and an electrode that are in contact with the hole injecting layer can be suppressed to the minimum level.Type: ApplicationFiled: December 16, 2003Publication date: December 2, 2004Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Atsushi Tokuda, Takako Takasu, Satoshi Seo, Ryoji Nomura
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Publication number: 20040230061Abstract: Organometallic complexes represented by chemical formula 1 are synthesized. In chemical formula 1, R1 to R5, are individually a hydrogen atom, a halogen atom, a lower alkyl group, an alkoxy group, an acyl group, a nitro group, a cyano group, an amino group, a dialkylamino group, a diarylamino group, a vinyl group, an aryl group, or a heterocyclic group. Each pair of R1 and R2, R2 and R3, and R4 and R5 may be bonded each other to form aromatic rings. Y is a heterocyclic group containing nitrogen atoms as hetero atoms. M is atoms of group 9 in the periodic table or atoms of group 10 in the periodic table. When the M is atoms of group 9 in the periodic table, n=2. When the M is atoms of group 10 in the periodic table, n=1. L is a monoanionic bidentate chelate ligand having a beta diketone structure, a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenol hydroxyl group.Type: ApplicationFiled: May 6, 2004Publication date: November 18, 2004Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Satoshi Seo, Atsushi Tokuda, Hideko Inoue
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Publication number: 20040124425Abstract: A triplet light emitting device which has high efficiency and improved stability and which can be fabricated by a simpler process is provided by simplifying the device structure and avoiding use of an unstable material. In a multilayer device structure using no hole blocking layer conventionally used in a triplet light emitting device, that is, a device structure in which on a substrate, there are formed an anode, a hole transporting layer constituted by a hole transporting material, an electron transporting and light emitting layer constituted by an electron transporting material and a dopant capable of triplet light emission, and a cathode, which are laminated in the stated order, the combination of the hole transporting material and the electron transporting material and the combination of the electron transporting material and the dopant material are optimized.Type: ApplicationFiled: December 16, 2003Publication date: July 1, 2004Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hiroko Yamazaki, Atsushi Tokuda, Tetsuo Tsutsui
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Patent number: 6734457Abstract: A triplet light emitting device which has high efficiency and improved stability and which can be fabricated by a simpler process is provided by simplifying the device structure and avoiding use of an unstable material. In a multilayer device structure using no hole blocking layer conventionally used in a triplet light emitting device, that is, a device structure in which on a substrate, there are formed an anode, a hole transporting layer constituted by a hole transporting material, an electron transporting and light emitting layer constituted by an electron transporting material and a dopant capable of triplet light emission, and a cathode, which are laminated in the stated order, the combination of the hole transporting material and the electron transporting material and the combination of the electron transporting material and the dopant material are optimized.Type: GrantFiled: November 26, 2002Date of Patent: May 11, 2004Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hiroko Yamazaki, Atsushi Tokuda, Tetsuo Tsutsui
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Publication number: 20030146443Abstract: A triplet light emitting device which has high efficiency and improved stability and which can be fabricated by a simpler process is provided by simplifying the device structure and avoiding use of an unstable material. In a multilayer device structure using no hole blocking layer conventionally used in a triplet light emitting device, that is, a device structure in which on a substrate, there are formed an anode, a hole transporting layer constituted by a hole transporting material, an electron transporting and light emitting layer constituted by an electron transporting material and a dopant capable of triplet light emission, and a cathode, which are laminated in the stated order, the combination of the hole transporting material and the electron transporting material and the combination of the electron transporting material and the dopant material are optimized.Type: ApplicationFiled: November 26, 2002Publication date: August 7, 2003Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Hiroko Yamazaki, Atsushi Tokuda, Tetsuo Tsutsui