Patents by Inventor Tadayoshi YANAGIHARA
Tadayoshi YANAGIHARA 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: 11486550Abstract: Provided is a method for producing a wavelength conversion sintered body that emits light under irradiation of excitation light. The method for producing a wavelength conversion sintered body includes: preparing a molded body obtained by molding a mixture containing an ?-SiAlON fluorescent material and aluminum oxide particles and having a content of Ga of 15 ppm by mass or less; and primary calcining the molded body at a temperature in a range of 1,370° C. or more and 1,600° C. or less to obtain a first sintered body.Type: GrantFiled: May 22, 2020Date of Patent: November 1, 2022Assignee: NICHIA CORPORATIONInventors: Tomoya Fukui, Tadayoshi Yanagihara
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Patent number: 11447694Abstract: A method for manufacturing a wavelength conversion member that offers a high emission intensity and a high light conversion efficiency is provided. The method for manufacturing a wavelength conversion member includes providing a green body containing an yttrium-aluminum-garnet phosphor with a composition represented by Formula (I) below and alumina particles with an alumina purity of 99.0% by mass or more, primary-sintering the green body to obtain a first sintered body, and secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body. (Y1-a-bGdaCeb)3Al5O12??(I) wherein a and b satisfy 0?a?0.3 and 0?b?0.022.Type: GrantFiled: February 4, 2021Date of Patent: September 20, 2022Assignee: NICHIA CORPORATIONInventors: Tadayoshi Yanagihara, Naoto Fujioka, Keisuke Suzuki
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Patent number: 11387390Abstract: A method for producing a wavelength converting member that emits light under irradiation of excitation light, and a wavelength converting member. The method for producing a wavelength converting member, including: providing a green body prepared by a process comprising molding a mixed powder containing a Ca-?-SiAlON fluorescent material and alumina, and depending on necessity an YAG fluorescent material; and primarily sintering the green body at a temperature in a range of 1,000° C. or more and 1,600° C. or less to obtain a first sintered body.Type: GrantFiled: November 26, 2018Date of Patent: July 12, 2022Assignee: NICHIA CORPORATIONInventors: Tomoya Fukui, Tadayoshi Yanagihara
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Patent number: 11149193Abstract: Provided are a method for producing a ceramic composite material that has a high light emission intensity, a ceramic composite material, and a light emitting device. The method for producing a ceramic composite material, includes: preparing a green body containing a nitride fluorescent material having a composition represented by the following chemical formula (I) and aluminum oxide particles mixed with each other; and performing primary sintering the green body at a temperature in a range of 1,250° C. or more and 1,600° C. or less to provide a first sintered body: MwLn1xAyNz??(I) wherein in the chemical formula (I), M represents at least one element selected from the group consisting of Ce and Pr; Ln1 represents at least one element selected from the group consisting of Sc, Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; A represents at least one element selected from the group consisting of Si and B; and w, x, y, and z each satisfy 0<w?1.0, 2.5?x?3.5, 5.5?y?6.5, and 10?z?12.Type: GrantFiled: April 4, 2019Date of Patent: October 19, 2021Assignee: NICHIA CORPORATIONInventors: Hirofumi Ooguri, Tomoya Fukui, Tadayoshi Yanagihara, Shigeki Yoshida
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Patent number: 11084977Abstract: Provided are a ceramic complex having high light emission intensity and a method for producing the same. Proposed is a ceramic complex, including a rare earth aluminate fluorescent material having a composition represented by the following formula (I) and an aluminum oxide, wherein the content of the aluminum oxide is 70% by mass or more, the content of Na is 7 ppm by mass or less, the content of Si is 5 ppm by mass or less, the content of Fe is 3 ppm by mass or less, and the content of Ga is 5 pm by mass or less, relative to the total amount of the rare earth aluminate fluorescent material having a composition represented by the following formula (I) and the aluminum oxide. (Ln1-aCea)3Al5O12 ??(I) wherein Ln represents at least one element selected from the group consisting of Y, Gd, Lu, and Tb; and a satisfies 0<a?0.022.Type: GrantFiled: August 28, 2019Date of Patent: August 10, 2021Assignee: NICHIA CORPORATIONInventors: Naoto Fujioka, Tadayoshi Yanagihara, Keisuke Suzuki, Hiroshi Ogasa
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Publication number: 20210179932Abstract: A method for manufacturing a wavelength conversion member that offers a high emission intensity and a high light conversion efficiency is provided. The method for manufacturing a wavelength conversion member includes providing a green body containing an yttrium-aluminum-garnet phosphor with a composition represented by Formula (I) below and alumina particles with an alumina purity of 99.0% by mass or more, primary-sintering the green body to obtain a first sintered body, and secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body. (Y1-a-bGdaCeb)3Al5O12??(I) wherein a and b satisfy 0?a?0.3 and 0<b?0.022.Type: ApplicationFiled: February 4, 2021Publication date: June 17, 2021Applicant: NICHIA CORPORATIONInventors: Tadayoshi YANAGIHARA, Naoto FUJIOKA, Keisuke SUZUKI
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Patent number: 10947448Abstract: A method for manufacturing a wavelength conversion member that offers a high emission intensity and a high light conversion efficiency is provided. The method for manufacturing a wavelength conversion member includes providing a green body containing an yttrium-aluminum-garnet phosphor with a composition represented by Formula (I) below and alumina particles with an alumina purity of 99.0% by mass or more, primary-sintering the green body to obtain a first sintered body, and secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body. (Y1-a-bGdaCeb)3Al5O12??(I) wherein a and b satisfy 0?a?0.3 and 0<b?0.022.Type: GrantFiled: February 27, 2018Date of Patent: March 16, 2021Assignee: NICHIA CORPORATIONInventors: Tadayoshi Yanagihara, Naoto Fujioka, Keisuke Suzuki
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Publication number: 20200370715Abstract: Provided is a method for producing a wavelength conversion sintered body that emits light under irradiation of excitation light. The method for producing a wavelength conversion sintered body includes: preparing a molded body obtained by molding a mixture containing an ?-SiAlON fluorescent material and aluminum oxide particles and having a content of Ga of 15 ppm by mass or less; and primary calcining the molded body at a temperature in a range of 1,370° C. or more and 1,600° C. or less to obtain a first sintered body.Type: ApplicationFiled: May 22, 2020Publication date: November 26, 2020Applicant: NICHIA CORPORATIONInventors: Tomoya FUKUI, Tadayoshi YANAGIHARA
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Publication number: 20200071606Abstract: Provided are a ceramic complex having high light emission intensity and a method for producing the same. Proposed is a ceramic complex, including a rare earth aluminate fluorescent material having a composition represented by the following formula (I) and an aluminum oxide, wherein the content of the aluminum oxide is 70% by mass or more, the content of Na is 7 ppm by mass or less, the content of Si is 5 ppm by mass or less, the content of Fe is 3 ppm by mass or less, and the content of Ga is 5 pm by mass or less, relative to the total amount of the rare earth aluminate fluorescent material having a composition represented by the following formula (I) and the aluminum oxide. (Lni-aCea)3Al5O12 ??(I) wherein Ln represents at least one element selected from the group consisting of Y, Gd, Lu, and Tb; and a satisfies 0<a?0.022.Type: ApplicationFiled: August 28, 2019Publication date: March 5, 2020Applicant: NICHIA CORPORATIONInventors: Naoto FUJIOKA, Tadayoshi YANAGIHARA, Keisuke SUZUKI, Hiroshi OGASA
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Publication number: 20190309221Abstract: Provided are a method for producing a ceramic composite material that has a high light emission intensity, a ceramic composite material, and a light emitting device. The method for producing a ceramic composite material, includes: preparing a green body containing a nitride fluorescent material having a composition represented by the following chemical formula (I) and aluminum oxide particles mixed with each other; and performing primary sintering the green body at a temperature in a range of 1,250° C. or more and 1,600° C. or less to provide a first sintered body: MwLn1xAyNz??(I) wherein in the chemical formula (I), M represents at least one element selected from the group consisting of Ce and Pr; Ln1 represents at least one element selected from the group consisting of Sc, Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; A represents at least one element selected from the group consisting of Si and B; and w, x, y, and z each satisfy 0<w?1.0, 2.5?x?3.5, 5.5?y?6.5, and 10?z?12.Type: ApplicationFiled: April 4, 2019Publication date: October 10, 2019Applicant: NICHIA CORPORATIONInventors: Hirofumi OOGURI, Tomoya FUKUI, Tadayoshi YANAGIHARA, Shigeki YOSHIDA
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Patent number: 10414976Abstract: A method of producing a fluorescent material that is capable of providing a light emitting device having excellent durability, a fluorescent material, and a light emitting device are provided. The method of producing the fluorescent material includes: preparing a calcined product having a chlorosilicate composition containing at least one element selected from the group consisting of Ca, Sr, and Ba, at least one element selected from the group consisting of Mg and Zn, at least one element selected from the group consisting of Eu, Ce, Tb, and Mn, Si, O, and Cl; and bringing the calcined product in contact with a fluorine-containing substance and heat-treating the calcined product in an inert gas atmosphere at a temperature in a range of 200° C. or more and 450° C. or less.Type: GrantFiled: March 15, 2017Date of Patent: September 17, 2019Assignee: NICHIA CORPORATIONInventors: Tadayoshi Yanagihara, Kazuya Nishimata, Shoji Hosokawa
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Publication number: 20190165220Abstract: A method for producing a wavelength converting member that emits light under irradiation of excitation light, and a wavelength converting member. The method for producing a wavelength converting member, including: providing a green body prepared by a process comprising molding a mixed powder containing a Ca-?-SiAlON fluorescent material and alumina, and depending on necessity an YAG fluorescent material; and primarily sintering the green body at a temperature in a range of 1,000° C. or more and 1,600° C. or less to obtain a first sintered body.Type: ApplicationFiled: November 26, 2018Publication date: May 30, 2019Applicant: NICHIA CORPORATIONInventors: Tomoya FUKUI, Tadayoshi YANAGIHARA
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Patent number: 10217907Abstract: A method of producing a nitride fluorescent material is provided. The nitride fluorescent material undergoes less change in chromaticity under a high-temperature and high-humidity condition and are excellent in durability. The nitride fluorescent material has a composition containing: at least one element selected from the group consisting of Ca, Sr, Ba, and Mg; at least one element selected from the group consisting of Li, Na, and K; at least one element selected from the group consisting of Eu, Ce, Tb, and Mn; Al; and N. The method includes: preparing a calcined product having the composition, bringing the calcined product in contact with a fluorine-containing substance, and heat-treating the calcined product at a temperature of 200° C. or more and 500° C. or less. A light emitting device using the nitride fluorescent material is also provided.Type: GrantFiled: February 23, 2017Date of Patent: February 26, 2019Assignee: NICHIA CORPORATIONInventors: Sadakazu Wakui, Tadayoshi Yanagihara, Shoji Hosokawa
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Patent number: 10190044Abstract: A method for producing a ?-sialon fluorescent material can be provided. The method includes preparing a composition containing silicon nitride that contains aluminium, an oxygen atom, and europium, heat-treating the composition in a rare gas atmosphere or in a vacuum, and contacting the heat-treated composition with a gas containing elemental fluorine.Type: GrantFiled: August 4, 2016Date of Patent: January 29, 2019Assignee: NICHIA CORPORATIONInventors: Shoji Hosokawa, Motoharu Morikawa, Tadayoshi Yanagihara, Kenichi Aoyagi, Takashi Kaide
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Publication number: 20180244986Abstract: A method for manufacturing a wavelength conversion member that offers a high emission intensity and a high light conversion efficiency is provided. The method for manufacturing a wavelength conversion member includes providing a green body containing an yttrium-aluminum-garnet phosphor with a composition represented by Formula (I) below and alumina particles with an alumina purity of 99.0% by mass or more, primary-sintering the green body to obtain a first sintered body, and secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body. (Y1-a-bGdaCeb)3Al5O12??(I) wherein a and b satisfy 0?a?0.3 and 0<b?0.022.Type: ApplicationFiled: February 27, 2018Publication date: August 30, 2018Applicant: NICHIA CORPORATIONInventors: Tadayoshi Yanagihara, Naoto Fujioka, Keisuke Suzuki
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Publication number: 20170275531Abstract: A method of producing a fluorescent material that is capable of providing a light emitting device having excellent durability, a fluorescent material, and a light emitting device are provided. The method of producing the fluorescent material includes: preparing a calcined product having a chlorosilicate composition containing at least one element selected from the group consisting of Ca, Sr, and Ba, at least one element selected from the group consisting of Mg and Zn, at least one element selected from the group consisting of Eu, Ce, Tb, and Mn, Si, O, and Cl; and bringing the calcined product in contact with a fluorine-containing substance and heat-treating the calcined product in an inert gas atmosphere at a temperature in a range of 200° C. or more and 450° C. or less.Type: ApplicationFiled: March 15, 2017Publication date: September 28, 2017Applicant: NICHIA CORPORATIONInventors: Tadayoshi YANAGIHARA, Kazuya NISHIMATA, Shoji HOSOKAWA
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Publication number: 20170250320Abstract: A method of producing a nitride fluorescent material is provided. The nitride fluorescent material undergoes less change in chromaticity under a high-temperature and high-humidity condition and are excellent in durability. The nitride fluorescent material has a composition containing: at least one element selected from the group consisting of Ca, Sr, Ba, and Mg; at least one element selected from the group consisting of Li, Na, and K; at least one element selected from the group consisting of Eu, Ce, Tb, and Mn; Al; and N. The method includes: preparing a calcined product having the composition, bringing the calcined product in contact with a fluorine-containing substance, and heat-treating the calcined product at a temperature of 200° C. or more and 500° C. or less. A light emitting device using the nitride fluorescent material is also provided.Type: ApplicationFiled: February 23, 2017Publication date: August 31, 2017Applicant: NICHIA CORPORATIONInventors: Sadakazu WAKUI, Tadayoshi YANAGIHARA, Shoji HOSOKAWA
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Publication number: 20170037311Abstract: A method for producing a ?-sialon fluorescent material can be provided. The method includes preparing a composition containing silicon nitride that contains aluminium, an oxygen atom, and europium, heat-treating the composition in a rare gas atmosphere or in a vacuum, and contacting the heat-treated composition with a gas containing elemental fluorine.Type: ApplicationFiled: August 4, 2016Publication date: February 9, 2017Applicant: NICHIA CORPORATIONInventors: Shoji HOSOKAWA, Motoharu MORIKAWA, Tadayoshi YANAGIHARA, Kenichi AOYAGI, Takashi KAIDE
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Publication number: 20090039307Abstract: A method for manufacturing a lithium-iron-phosphorus compound oxide carbon complex includes the steps of adding a solution containing lithium ions (Solution B) to a solution containing lithium ions and phosphate ions (Solution C) while a solution containing divalent iron ions (Solution A) is added to Solution C so as to produce a coprecipitate containing lithium, iron, and phosphorus in a first step, mixing the coprecipitate and an electrically conductive carbon material so as to produce a raw material mixture for calcining in a second step, and calcining the raw material mixture for calcining in an inert gas atmosphere so as to produce the lithium-iron-phosphorus compound oxide carbon complex in a third step.Type: ApplicationFiled: July 24, 2008Publication date: February 12, 2009Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.Inventors: Yasuhiro NAKAOKA, Tadayoshi YANAGIHARA
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Publication number: 20090028772Abstract: A method for manufacturing a lithium-iron-phosphorus compound oxide carbon complex includes the steps of allowing a solution containing lithium ions, divalent iron ions, and phosphate ions (Solution A) to contact with a solution containing an alkali (Solution B) while pH is controlled at 5.5 to 9.5 so as to produce a coprecipitate containing lithium, iron, and phosphorus in a first step, mixing the coprecipitate and an electrically conductive carbon material so as to produce a raw material mixture for calcining in a second step, and calcining the raw material mixture for calcining in an inert gas atmosphere so as to produce the lithium-iron-phosphorus compound oxide carbon complex in a third step.Type: ApplicationFiled: July 25, 2008Publication date: January 29, 2009Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.Inventors: Yasuhiro NAKAOKA, Tadayoshi YANAGIHARA