Patents by Inventor Takatoshi Seto
Takatoshi Seto 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: 9856418Abstract: Disclosed is a phosphor including at least one of a nitride and an oxynitride, wherein the nitride and the oxynitride contain an alkaline-earth metal element, silicon, and an activator element. wherein the phosphor has a volume average particle diameter of greater than or equal to about 50 nm and less than or equal to about 400 nm and an inner quantum efficiency of greater than or equal to about 60% at an excitation wavelength of about 450 nm. The method of preparing a phosphor includes a precursor preparation process of preparing a phosphor precursor particles including a silicon nitride particles, a compound containing an alkaline-earth metal element, and a compound containing an activator element, wherein the compound containing an alkaline-earth metal element and the compound containing an activator element are deposited on the surface of the silicon nitride particles; and a firing process of firing the phosphor precursor particles.Type: GrantFiled: July 20, 2015Date of Patent: January 2, 2018Assignee: Samsung Electronics Co., Ltd.Inventors: Takuya Kitabatake, Fusaki Fujibayashi, Hiroko Endo, Masahide Yamada, Takatoshi Seto
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Patent number: 9725648Abstract: A yellow phosphor is provided. The yellow phosphor includes a crystal formed of a compound that is represented by the following formula (1): Ln4?x(EuzM1?z)xSi12?yAlyO3+x+yN18?x?y(0.5?x?3, 0<z<0.3, 0<y?4) (1), wherein Ln includes at least one rare earth element, and M includes at least one selected from calcium (Ca), barium (Ba), strontium (Sr), and magnesium (Mg).Type: GrantFiled: December 10, 2014Date of Patent: August 8, 2017Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Takamasa Izawa, Dohoon Kim, Masahiko Yoshino, Takatoshi Seto
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Patent number: 9360784Abstract: A magenta toner for developing electrostatic latent images, wherein the magenta toner includes a magenta toner particle having a polymer binder and a colorant, wherein the colorant includes a magenta pigment or dye and a visible light-excitable nitride fluorescent substance.Type: GrantFiled: January 9, 2015Date of Patent: June 7, 2016Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Fusaki Fujibayashi, Takuya Kitabatake, Takatoshi Seto
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Publication number: 20160017222Abstract: Disclosed is a phosphor including at least one of a nitride and an oxynitride, wherein the nitride and the oxynitride contain an alkaline-earth metal element, silicon, and an activator element. wherein the phosphor has a volume average particle diameter of greater than or equal to about 50 nm and less than or equal to about 400 nm and an inner quantum efficiency of greater than or equal to about 60% at an excitation wavelength of about 450 nm. The method of preparing a phosphor includes a precursor preparation process of preparing a phosphor precursor particles including a silicon nitride particles, a compound containing an alkaline-earth metal element, and a compound containing an activator element, wherein the compound containing an alkaline-earth metal element and the compound containing an activator element are deposited on the surface of the silicon nitride particles; and a firing process of firing the phosphor precursor particles.Type: ApplicationFiled: July 20, 2015Publication date: January 21, 2016Inventors: Takuya KITABATAKE, Fusaki FUJIBAYASHI, Hiroko ENDO, Masahide YAMADA, Takatoshi SETO
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Publication number: 20150192873Abstract: A magenta toner for developing electrostatic latent images, wherein the magenta toner includes a magenta toner particle having a polymer binder and a colorant, wherein the colorant includes a magenta pigment or dye and a visible light-excitable nitride fluorescent substance.Type: ApplicationFiled: January 9, 2015Publication date: July 9, 2015Inventors: Fusaki FUJIBAYASHI, Takuya KITABATAKE, Takatoshi SETO
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Publication number: 20150159085Abstract: A yellow phosphor is provided. The yellow phosphor includes a crystal formed of a compound that is represented by the following formula (1): Ln4?x(EuzM1?z)xSi12?yAlyO3+x+yN18?x?y(0.5?x?3, 0<y?4) (1), wherein Ln includes at least one selected from a Group IIIa element and a rare earth element, and M includes at least one selected from calcium (Ca), barium (Ba), strontium (Sr), and magnesium (Mg).Type: ApplicationFiled: December 10, 2014Publication date: June 11, 2015Inventors: Takamasa IZAWA, Dohoon KIM, Masahiko YOSHINO, Takatoshi SETO
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Patent number: 8992797Abstract: To provide a new phosphor of which fluorescence contains much red light component and has a large full width at half maximum, the crystal phase represented by the formula [I] is included in the phosphor. R3?x?y?z+w2MzA1.5x+y?w2Si6?w1?w2AlW1+w2Oy+w1N11?y?w1??[I] (R represents La, Gd, Lu, Y and/or Sc, M represents Ce, Eu, Mn, Yb, Pr and/or Tb, A represents Ba, Sr, Ca, Mg and/or Zn, and x, y, z, w1 and w2 are the numeric values in the following ranges: (1/7)?(3?x?y?z+w2)/6<(1/2), 0<(1.5x+y?w2)/6<(9/2), 0<x<3, 0?y<2, 0<z<1, 0?w1?5, 0?w2?5, and 0?w1+w2?5).Type: GrantFiled: March 15, 2013Date of Patent: March 31, 2015Assignee: Mitsubishi Chemical CorporationInventors: Takatoshi Seto, Naoto Kijima
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Patent number: 8828272Abstract: A phosphor includes a crystal phase of a formula (Ln,Ca,Ce)3+?Si6N11. In this formula, ? is from ?0.1 to 1.5, inclusive. When an object color of the phosphor is expressed by the L*a*b* color system, the value of (a*2+b*2)1/2 satisfies 71?(a*2+b*2)1/2. Also in the formula, Ln is La, Gd, Lu, Y, Sc, or any combination of these. When the phosphor is excited with light having a wavelength of 455 nm, it emits a color wherein x is from 0.400 to 0.570 inclusive, and y is from 0.420 to 0.590, inclusive, as expressed in the CIE standard coordinate system.Type: GrantFiled: October 18, 2013Date of Patent: September 9, 2014Assignee: Mitsubishi Chemical CorporationInventors: Takatoshi Seto, Naoto Kijima, Keiichi Seki, Ryuji Adachi, Hiroyasu Yamada, Tatsuya Inoue
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Patent number: 8703019Abstract: A phosphor which emits light having high brightness, serves as an excellent orange or red phosphor whose light brightness is less decreased when exposed to an excitation source contains a crystal phase having the chemical composition expressed by the general formula [1]: (1?a?b)(Ln?pMII?1?pMIII?MIV?N3).a(MIV?(3n+2)/4NnO).b(AMIV?2N3)??[1] wherein Ln? represents a metal element selected from the group consisting of lanthanoids, Mn, and Ti; MnII? represents a divalent metal element except the Ln? element; MIII? represents a trivalent metal element; MIV? represents a tetravalent metal element; A represents a metal element selected from the group consisting of Li, Na, and K; 0<p?0.2; 0?a, 0?b, a+b>0, 0?n, and 0.002?(3n+2)a/4?0.9.Type: GrantFiled: May 22, 2012Date of Patent: April 22, 2014Assignees: Mitsubishi Chemical Corporation, Independent Administrative Institution National Institute for Materials ScienceInventors: Naoto Hirosaki, Takatoshi Seto, Naoto Kijima
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Publication number: 20140042898Abstract: To provide a yellow to orange phosphor which has high luminance and excellent temperature characteristics and which also has high luminance when mixed with a phosphor of a different color. A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy ?20?a*??2, 71?b* and 71?(a*2+b*2)1/2, respectively: R3?x?y?z+w2MzA1.Type: ApplicationFiled: October 18, 2013Publication date: February 13, 2014Applicant: Mitsubishi Chemical CorporationInventors: Takatoshi Seto, Naoto Kijima, Keiichi Seki, Ryuji Adachi, Hiroyasu Yamada, Tatsuya Inoue
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Patent number: 8574459Abstract: To provide a yellow to orange phosphor which has high luminance and excellent temperature characteristics and which also has high luminance when mixed with a phosphor of a different color. A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy ?20?a*??2, 71?b* and 71?(a*2+b*2)1/2, respectively: R3?x?y?z+w2MzA1.5x+y?w2Si6?w1?w2Alw1+w2Oy+w1N11?y?w1??[I].Type: GrantFiled: September 23, 2011Date of Patent: November 5, 2013Assignee: Mitsubishi Chemical CorporationInventors: Takatoshi Seto, Naoto Kijima, Keiichi Seki, Ryuji Adachi, Hiroyasu Yamada, Tatsuya Inoue
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Publication number: 20130234588Abstract: To provide a new phosphor of which fluorescence contains much red light component and has a large full width at half maximum, the crystal phase represented by the formula [I] is included in the phosphor. R3?x?y?z+w2MzA1.5x+y?w2Si6?w1?w2AlW1+w2Oy+w1N11?y?w1??[I] (R represents La, Gd, Lu, Y and/or Sc, M represents Ce, Eu, Mn, Yb, Pr and/or Tb, A represents Ba, Sr, Ca, Mg and/or Zn, and x, y, z, w1 and w2 are the numeric values in the following ranges: (1/7)?(3?x?y?z+w2)/6<(1/2), 0<(1.5x+y?w2)/6<(9/2), 0<x<3, 0?y<2, 0<z<1, 0?w1?5, 0?w2?5, and 0?w1+w2?5.Type: ApplicationFiled: March 15, 2013Publication date: September 12, 2013Inventors: Takatoshi SETO, Naoto Kijima
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Patent number: 8398890Abstract: To provide a new phosphor of which fluorescence contains much red light component and has a large full width at half maximum, the crystal phase represented by the formula [I] is included in the phosphor. R3?x?y?z+w2MzA1.5x+y?w2Si6?w1?w2AlW1+w2Oy+w1N11?y?w1??[I] (R represents La, Gd, Lu, Y and/or Sc, M represents Ce, Eu, Mn, Yb, Pr and/or Tb, A represents Ba, Sr, Ca, Mg and/or Zn, and x, y, z, w1 and w2 are the numeric values in the following ranges: ( 1/7)?(3?x?y?z+w2)/6<(½), 0<(1.Type: GrantFiled: October 19, 2009Date of Patent: March 19, 2013Assignee: Mitsubishi Chemical CorporationInventors: Takatoshi Seto, Naoto Kijima
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Publication number: 20120286646Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr, Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.12?b/(a+b)?0.4.Type: ApplicationFiled: April 26, 2012Publication date: November 15, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Hiroaki SAKUTA, Kazuhiko Kagawa, Yoshihito Sato, Takatoshi Seto, Naoto Kijima
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Publication number: 20120267999Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr,Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.12?b/(a+b)?0.4.).Type: ApplicationFiled: March 2, 2012Publication date: October 25, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Hiroaki Sakuta, Kazuhiko Kagawa, Yoshihito Sato, Takatoshi Seto, Naoto Kijima
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Publication number: 20120262648Abstract: A phosphor which emits light having high brightness, serves as an excellent orange or red phosphor whose light brightness is less decreased when exposed to an excitation source contains a crystal phase having the chemical composition expressed by the general formula [1]: (1?a?b)(Ln?pMII?1-pMIII?MIV?N3).a(MIV?(3n+2)/4NnO).b(AMIV?2N3)??[1] wherein Ln? represents a metal element selected from the group consisting of lanthanoids, Mn, and Ti; MnII? represents a divalent metal element except the Ln? element; MIII? represents a trivalent metal element; MIV? represents a tetravalent metal element; A represents a metal element selected from the group consisting of Li, Na, and K; 0<p?0.2; 0?a, 0?b, a+b>0, 0?n, and 0.002?(3n+2)a/4?0.9.Type: ApplicationFiled: May 22, 2012Publication date: October 18, 2012Applicants: Independent Administrative Institution National Institute For Materials Science, Mitsubishi Chemical CorporationInventors: Naoto HIROSAKI, Takatoshi Seto, Naoto Kijima
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Publication number: 20120256533Abstract: To provide a yellow to orange phosphor which has high luminance and excellent temperature characteristics and which also has high luminance when mixed with a phosphor of a different color. A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy ?20?a*??2, 71?b* and 71?(a*2+b*2)1/2, respectively: R3?x?y?z+w2MzA1.Type: ApplicationFiled: September 23, 2011Publication date: October 11, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Takatoshi Seto, Naoto Kijima, Keiichi Seki, Ryuji Adachi, Hiroyasu Yamada, Tatsuya Inoue
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Publication number: 20120212123Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr,Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.05?b/(a+b)?0.6.Type: ApplicationFiled: February 29, 2012Publication date: August 23, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Hiroaki SAKUTA, Kazuhiko Kagawa, Yoshihito Sato, Takatoshi Seto, Naoto Kijima
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Patent number: 8206611Abstract: A phosphor which emits light having high brightness, serves as an excellent orange or red phosphor whose light brightness is less decreased when exposed to an excitation source contains a crystal phase having the chemical composition expressed by the general formula [1]: (1?a?b)(Ln?pMII?1?pMIII?MIV?N3).a(MIV?(3n+2)/4NnO).b(AMIV?2N3)??[1] wherein Ln? represents a metal element selected from the group consisting of lanthanoids, Mn, and Ti; MnII? represents a divalent metal element except the Ln? element; MIII? represents a trivalent metal element; MIV? represents a tetravalent metal element; A represents a metal element selected from the group consisting of Li, Na, and K; 0<p?0.2; 0?a, 0?b, a+b>0, 0?n, and 0.002?(3n+2)a/4?0.9.Type: GrantFiled: May 24, 2006Date of Patent: June 26, 2012Assignees: Mitsubishi Chemical Corporation, Independent Administrative Institution National Institute for Materials ScienceInventors: Naoto Hirosaki, Takatoshi Seto, Naoto Kijima
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Publication number: 20100090585Abstract: To provide a phosphor that stably shows high emission intensity and brightness as well as superior temperature characteristics, under excitation by near-ultraviolet light, the phosphor contains an alkaline-earth metal aluminate and has a crystal phase comprising an alkali metal element and, in that crystal phase, the rate of substituted Eu (europium) to the number of sites which can be substituted with Eu of the crystal phase is 25% or higher and the ratio of the alkali metal element to the number of sites which can be substituted with Eu of the crystal phase is 3% or lower.Type: ApplicationFiled: September 29, 2009Publication date: April 15, 2010Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Takatoshi SETO, Naoto KIJIMA, Etsuo SHIMIZU, Kumie SHIMIZU