Patents by Inventor Yutaka Terao
Yutaka Terao 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: 10749001Abstract: A method of evaluating an insulated-gate semiconductor device having an insulated-gate structure including a channel formation layer made of a wide-bandgap semiconductor and a gate insulating film formed contacting the channel formation layer includes removing the gate insulating film in order to expose a surface of the channel formation layer; taking a phase image of the exposed surface of the channel formation layer using a phase mode of an atomic force microscope; evaluating a surface condition of the exposed surface of the channel formation layer by calculating an evaluation metric from phase shift values in the phase image and by determining whether the evaluation metric satisfies a prescribed condition; and determining that the insulated-gate semiconductor device is acceptable when the evaluation metric satisfied the prescribed condition.Type: GrantFiled: December 4, 2018Date of Patent: August 18, 2020Assignee: FUJI ELECTRIC CO., LTD.Inventors: Takayuki Hirose, Yutaka Terao, Aki Takigawa, Etsuko Tomita
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Publication number: 20190172912Abstract: A method of evaluating an insulated-gate semiconductor device having an insulated-gate structure including a channel formation layer made of a wide-bandgap semiconductor and a gate insulating film formed contacting the channel formation layer includes removing the gate insulating film in order to expose a surface of the channel formation layer; taking a phase image of the exposed surface of the channel formation layer using a phase mode of an atomic force microscope; evaluating a surface condition of the exposed surface of the channel formation layer by calculating an evaluation metric from phase shift values in the phase image and by determining whether the evaluation metric satisfies a prescribed condition; and determining that the insulated-gate semiconductor device is acceptable when the evaluation metric satisfied the prescribed condition.Type: ApplicationFiled: December 4, 2018Publication date: June 6, 2019Applicant: Fuji Electric Co., Ltd.Inventors: Takayuki HIROSE, Yutaka TERAO, Aki TAKIGAWA, Etsuko TOMITA
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Publication number: 20180308937Abstract: Provided is a MOS gate using a thermally oxidized film as a gate insulating film on the front surface of a silicon carbide substrate. A ratio of an excess carbon amount at an SiO2/SiC interface in relation to a carbon amount in the silicon carbide substrate is 0.1 or less. The excess carbon at the SiO2/SiC interface is generated during thermal oxidation for forming the gate insulating film. The excess carbon is a compound constituted of carbon atoms having the pi (it) bonds, and specifically is graphite, for example. The amount of nitrogen at the SiO2/SiC interface is 1.4×1015/cm2 to 1.8×1015/cm2, inclusive, for example.Type: ApplicationFiled: March 8, 2018Publication date: October 25, 2018Applicant: Fuji Electric Co., Ltd.Inventors: Takayuki HIROSE, Yutaka TERAO, Aki TAKIGAWA, Hideaki TERANISHI, Akira SAITO
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Patent number: 8808877Abstract: A method of manufacturing an organic EL element, which may be a top-emitting or a transparent organic EL element, provides an organic EL element having a low driving voltage and a high efficiency. The organic EL element includes a substrate; an anode; an organic EL layer which includes at least an emissive layer, an electron transport layer and a damage-mitigating electron injection layer; and a transparent cathode composed of a transparent conductive oxide material, the damage-mitigating electron injection layer is in contact with the transparent cathode, and the damage-mitigating electron injection layer includes a crystalline oligothiophene compound.Type: GrantFiled: August 18, 2009Date of Patent: August 19, 2014Assignee: Sharp Kabushiki KaishaInventor: Yutaka Terao
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Patent number: 8525159Abstract: An organic light emitting element includes a pair of electrodes at least one of which has visible light transmittance; and an organic EL layer provided between the pair of electrodes. The organic EL layer includes at least an organic light emitting layer that emits light when a voltage is applied between the pair of electrodes. The organic light emitting layer includes an electron transport host material; and at least first and second guest materials. Each of the first and second guest materials has an emission peak in a blue to blue-green color region. The electron transport host material has an ionization potential (IPH) and an electron affinity (AFH), and the first guest material has an ionization potential (IPG1) and an electron affinity (AFG1) that satisfy Expression (1): IPH?IPG1 and AFH<AFG1 (1). The organic light emitting element has significantly improved efficiency without any influence on driving voltage.Type: GrantFiled: September 11, 2009Date of Patent: September 3, 2013Assignee: Sharp Kabushiki KaishaInventors: Yutaka Terao, Koji Kawaguchi, Toshio Hama
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Patent number: 8497500Abstract: The object of the present invention is to provide an organic EL device having a structure that resolves a problem of trade-off between decrease in a drive voltage and increase in production yield. The organic EL device of the present invention includes a substrate, a pair of electrodes provided on the substrate, and an organic EL layer sandwiched by the pair of electrodes; the pair of electrodes includes a positive electrode and a negative electrode; the organic EL layer includes at least a light-emitting layer and a hole injection layer that is in contact with the positive electrode; the hole injection layer is formed of an n-type semiconductor host material and a p-type semiconductor guest material; a LUMO level EHIC of the host material and a HOMO level of the guest material or a valence band level EGV satisfy: |EHIC|+0.5 eV?|EGV|>|EHIC|?0.6 eV.Type: GrantFiled: April 21, 2009Date of Patent: July 30, 2013Assignee: Sharp Kabushiki KaishaInventor: Yutaka Terao
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Patent number: 8492752Abstract: An organic light emitting element includes a pair of electrodes at least one of which has visible light transmittance; and an organic EL layer provided between the pair of electrodes. The organic EL layer includes at least an organic light emitting layer that emits light when a voltage is applied between the pair of electrodes. The organic light emitting layer includes an electron transport host material; and at least first and second guest materials. Each of the first and second guest materials has an emission peak in a blue to blue-green color region. The electron transport host material has an ionization potential (IPH) and an electron affinity (AFH), and the first guest material has an ionization potential (IPG1) and an electron affinity (AFG1) that satisfy Expression (1): IPH?IPG1 and AFH<AFG1 (1). The organic light emitting element has significantly improved efficiency without any influence on driving voltage.Type: GrantFiled: September 11, 2009Date of Patent: July 23, 2013Assignee: Sharp Kabushiki KaishaInventors: Yutaka Terao, Koji Kawaguchi, Toshio Hama
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Patent number: 8299458Abstract: An organic EL device is provided with a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer between an anode and a cathode, wherein the hole injection layer is obtained by doping a hole transport material with an electron-accepting impurity, and the ionization potential Ip(HIL) of the material of the hole injection layer that composes the hole injection layer (also referred to as a hole injection material in the present description), the ionization potential Ip(HTL) of the hole transport material, and the ionization potential Ip(EML) of the material of the light-emitting layer (also referred to as a light-emitting layer material in the present description) respectively satisfy the relationship of Ip(EML)>Ip(HTL)?Ip(HIL)?Ip(EML)?0.4 eV.Type: GrantFiled: October 31, 2008Date of Patent: October 30, 2012Assignee: Sharp Kabushiki KaishaInventors: Yutaka Terao, Naoyuki Kanai
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Publication number: 20120018709Abstract: An organic EL element, includes, in the order recited: a supporting substrate; an anode; an organic EL layer and having provided thereon, in the order recited: a hole transport layer; a light emission layer; an electron transport layer; and an electron injection layer, in which the hole transport layer, the light emission layer, and the electron transport layer are composed of organic materials, and the electron injection layer is composed of an n-type chalcogenide semiconductor having an optical band gap of 2.1 eV or greater; and a cathode provided on the organic EL layer and composed of a transparent conductive oxide. The organic EL element is a low-voltage, high-efficiency top-emission type or transparent organic EL element. Disclosed also is a method of manufacturing the organic EL element includes forming the electron injection layer by a physical vapor phase growth method that is free of plasma discharge.Type: ApplicationFiled: April 14, 2009Publication date: January 26, 2012Applicant: FUJI ELECTRIC CO., LTD.Inventor: Yutaka Terao
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Patent number: 8102070Abstract: The objective of the invention is to provide a float-type energy-generating system that is able to maintain the system's body stably, without listing, while sailing, even in a strong wind, while efficiently generating electricity. The system includes a hull (4) that allows the system to be suspended underwater or to float on seawater, one or more plates (6) that receive the sea wind so as to allow the hull to sail, and one or more power generators (3) that generate electricity by rotating one or more water turbines that use water as a working medium while the hull sails.Type: GrantFiled: June 8, 2007Date of Patent: January 24, 2012Inventor: Yutaka Terao
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Publication number: 20110297917Abstract: A method of manufacturing an organic EL element, which may be a top-emitting or a transparent organic EL element, provides an organic EL element having a low driving voltage and a high efficiency. The organic EL element includes a substrate; an anode; an organic EL layer which includes at least an emissive layer, an electron transport layer and a damage-mitigating electron injection layer; and a transparent cathode composed of a transparent conductive oxide material, the damage-mitigating electron injection layer is in contact with the transparent cathode, and the damage-mitigating electron injection layer includes a crystalline oligothiophene compound.Type: ApplicationFiled: August 18, 2009Publication date: December 8, 2011Applicant: FUJI ELECTRIC HOLDINGS CO., LTD.Inventor: Yutaka Terao
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Publication number: 20110291082Abstract: An organic light emitting element includes a pair of electrodes at least one of which has visible light transmittance; and an organic EL layer provided between the pair of electrodes. The organic EL layer includes at least an organic light emitting layer that emits light when a voltage is applied between the pair of electrodes. The organic light emitting layer includes an electron transport host material; and at least first and second guest materials. Each of the first and second guest materials has an emission peak in a blue to blue-green color region. The electron transport host material has an ionization potential (IPH) and an electron affinity (AFH), and the first guest material has an ionization potential (IPG1) and an electron affinity (AFG1) that satisfy Expression (1): IPH?IPG1 and AFH<AFG1 (1). The organic light emitting element has significantly improved efficiency without any influence on driving voltage.Type: ApplicationFiled: September 11, 2009Publication date: December 1, 2011Applicant: FUJI ELECTRIC CO., LTD.Inventors: Yutaka Terao, Koji Kawaguchi, Toshio Hama
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Publication number: 20110233525Abstract: An organic EL device is provided with a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer between an anode and a cathode, wherein the hole injection layer is obtained by doping a hole transport material with an electron-accepting impurity, and the ionization potential Ip(HIL) of the material of the hole injection layer that composes the hole injection layer (also referred to as a hole injection material in the present description), the ionization potential Ip(HTL) of the hole transport material, and the ionization potential Ip(EML) of the material of the light-emitting layer (also referred to as a light-emitting layer material in the present description) respectively satisfy the relationship of Ip(EML)>Ip(HTL)?Ip(HIL)?Ip(EML)?0.4 eV.Type: ApplicationFiled: October 31, 2008Publication date: September 29, 2011Applicant: FUJI ELECTRIC HOLDINGS CO., LTD.Inventors: Yutaka Terao, Naoyuki Kanai
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Publication number: 20110140089Abstract: The object of the present invention is to provide an organic EL device having a structure that resolves a problem of trade-off between decrease in a drive voltage and increase in production yield. The organic EL device of the present invention includes a substrate, a pair of electrodes provided on the substrate, and an organic EL layer sandwiched by the pair of electrodes; the pair of electrodes includes a positive electrode and a negative electrode; the organic EL layer includes at least a light-emitting layer and a hole injection layer that is in contact with the positive electrode; the hole injection layer is formed of an n-type semiconductor host material and a p-type semiconductor guest material; a LUMO level EHIC of the host material and a HOMO level of the guest material or a valence band level EGV satisfy: |EHIC|+0.5 eV?|EGV|>IHIC|?0.6 eV.Type: ApplicationFiled: April 21, 2009Publication date: June 16, 2011Applicant: FUJI ELECTRIC HOLDINGS CO., LTD.Inventor: Yutaka Terao
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Patent number: 7863808Abstract: A resonant cavity color conversion EL element in which intensity of converted light from a color conversion layer is increased and an organic EL display device in which viewing angle dependence of the color tone is small and the manufacturing process is simple. The EL element includes at least a pair of electrodes; a functional layer includes a light-emitting layer and is sandwiched by the pair of electrodes; a color conversion layer that absorbs light emitted from the light-emitting layer and emits light with a different wavelength; and a pair of light reflective layers. Notably, the pair of light reflective layers are composed of a non-transparent reflective layer and a semi-transparent reflective layer that have a distance therebetween that is set at an optical distance to construct a microcavity that increases intensity of light with a specific wavelength emitted from the color conversion layer.Type: GrantFiled: February 10, 2009Date of Patent: January 4, 2011Assignee: Fuji Electric Holdings Co., Ltd.Inventor: Yutaka Terao
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Publication number: 20090243471Abstract: An organic EL device is disclosed in which the amount of dopant added is easily controlled, and which is able to achieve stable light emission that does not depend on the current density of electrical current passing through the device. The organic electroluminescent device includes a first electrode, an organic electroluminescent layer having a hole injecting and transporting layer, an organic emissive layer and an electron injecting and transporting layer, and a second electrode. The organic emissive layer has an inner layer interposed between two outer layers. The outer layers contact the hole injecting and transporting layer and the electron injecting and transporting layer, respectively. The two outer layers are composed of a host material and a first fluorescent dopant, and the inner layer is composed of a host material, a first fluorescent dopant and a second fluorescent dopant. The first fluorescent dopant has a larger bandgap than the second fluorescent dopant.Type: ApplicationFiled: February 3, 2009Publication date: October 1, 2009Applicant: FUJI ELECTRIC HOLDINGS CO., LTD.Inventors: Yukinori KAWAMURA, Yutaka TERAO, Makoto KOBAYASHI, Naoyuki KANAI, Ryohei MAKINO
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Publication number: 20090212696Abstract: A resonant cavity color conversion EL element in which intensity of converted light from a color conversion layer is increased and an organic EL display device in which viewing angle dependence of the color tone is small and the manufacturing process is simple. The EL element includes at least a pair of electrodes; a functional layer includes a light-emitting layer and is sandwiched by the pair of electrodes; a color conversion layer that absorbs light emitted from the light-emitting layer and emits light with a different wavelength; and a pair of light reflective layers. Notably, the pair of light reflective layers are composed of a non-transparent reflective layer and a semi-transparent reflective layer that have a distance therebetween that is set at an optical distance to construct a microcavity that increases intensity of light with a specific wavelength emitted from the color conversion layer.Type: ApplicationFiled: February 10, 2009Publication date: August 27, 2009Applicant: FUJI ELECTRIC HOLDINGS CO., LTD.Inventor: Yutaka Terao
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Publication number: 20090189396Abstract: The objective of the invention is to provide a float-type energy-generating system that is able to maintain the system's body stably, without listing, while sailing, even in a strong wind, while efficiently generating electricity. The system includes a hull (4) that allows the system to be suspended underwater or to float on seawater, one or more plates (6) that receive the sea wind so as to allow the hull to sail, and one or more power generators (3) that generate electricity by rotating one or more water turbines that use water as a working medium while the hull sails.Type: ApplicationFiled: June 8, 2007Publication date: July 30, 2009Inventor: Yutaka Terao
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Publication number: 20080224595Abstract: The present invention provides a high-efficiency organic EL device that can be fabricated by a simple process and that can prevent color shift arising from variations in film thickness. The organic EL light-emitting device includes a plurality of independent light-emitting elements that constitute first, second, and third emission color subpixels. The light-emitting elements constituting the first emission color subpixels and the second emission color subpixels have a semitransparent reflective layer between a transparent substrate and a transparent electrode, and this semitransparent reflective layer is configured so as to function with the reflective electrode as a resonator for the light of the emission colors. The light-emitting elements constituting the third emission color subpixels additionally have a color conversion layer between the transparent substrate and the transparent electrode.Type: ApplicationFiled: March 12, 2008Publication date: September 18, 2008Applicant: FUJI ELECTRIC HOLDINGS CO., LTD.Inventors: Yuko Nakamata, Yukinori Kawamura, Toshio Hama, Koji Kawaguchi, Yutaka Terao
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Publication number: 20080003455Abstract: A white organic EL element structure exhibiting a good emission efficiency in which the emission color does not vary with current application time. The organic EL element has an organic EL layer sandwiched by a pair of electrodes, characterized in that wherein the organic EL layer includes at least a carrier recombination layer and one or more of carrier nonrecombination layers the carrier recombination layer emits blue or blue green EL light having a peak wavelength of 400-500 nm through recombination of carriers injected into the organic EL element, the carrier nonrecombination layer contains a host material having carrier injection/transportation ability and absorbing at least a part of the EL light and one or more of kinds of PL emission dye material emitting PL light of lower energy than that of the EL light, and the distance between the carrier recombination layer and the carrier nonrecombination layer is 15 nm or above.Type: ApplicationFiled: October 20, 2005Publication date: January 3, 2008Applicant: FUJI ELECTRIC HOLDINGS CO., LTD.Inventors: Chong Li, Hiroshi Kimura, Koji Kawaguchi, Yutaka Terao, Toshio Hama