Patents by Inventor Naoto Hirosaki

Naoto Hirosaki 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).

  • Patent number: 10662374
    Abstract: Provided are a phosphor, a manufacture thereof, and an illuminating device and an image display device using same which has excellent blue excitation characteristics of at least 440 nm and not exceeding 449 nm. The phosphor of the present invention includes an inorganic compound in which an AlON crystal, an AlON solid solution crystal, or an inorganic crystal having a same crystal structure as AlON, includes at least Mn and an A element (where the A element is a monovalent metal element) and, if necessary, a D element (where the D element is an element other than Mn, the A element, Al, O, and N) wherein, upon irradiation of an excitation source, the phosphor emits fluorescence having a peak wavelength in a range of at least 490 nm and not exceeding 550 nm.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: May 26, 2020
    Assignee: National Institute for Materials Science
    Inventor: Naoto Hirosaki
  • Patent number: 10479935
    Abstract: Provided are a fluorescent material having a high light emission intensity, a method for producing the same, and a light emitting device using the same. The present fluorescent material includes a composition represented by formula (I): SiuEuvAlwOxNy, wherein when the sum of a parameter u and a parameter w is taken as 13, parameters u, v, w, x, and y in the formula (I) satisfy the following formulae (1) to (5). 2.77?u?2.88??(1) 0.04?v?0.08??(2) 10.12?w?10.23??(3) 0.42?x?0.95??(4) 12.89?y?13.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: November 19, 2019
    Assignees: NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION
    Inventors: Naoto Hirosaki, Takayuki Shinohara, Shoji Hosokawa
  • Patent number: 10381529
    Abstract: A light-emitting device includes a light-emitting element that emits blue light, a Mn2+-activated ?-AlON green phosphor, and a dispersing material in which the green phosphor is dispersed. The green phosphor has an in-crystal Mn concentration of 2.5 wt % or more. The shortest path of the blue light through the dispersing material is 1 mm long or shorter.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: August 13, 2019
    Assignees: SHARP KABUSHIKI KAISHA, NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Kenichi Yoshimura, Makoto Izumi, Hiroshi Fukunaga, Naoto Hirosaki
  • Patent number: 10381528
    Abstract: The present invention provides a light emitting device that makes it possible to provide an image display apparatus having a wide color reproduction range. The light emitting device includes a light emitting element that emits blue light; a Mn2+-activated ?-AlON phosphor that is a green phosphor; and a Mn4+-activated phosphor that is a red phosphor. The green light emitted by the Mn2+-activated ?-AlON phosphor has an emission-spectrum peak wavelength of not less than 518 nm and not more than 528 nm.
    Type: Grant
    Filed: August 15, 2016
    Date of Patent: August 13, 2019
    Assignees: SHARP KABUSHIKI KAISHA, NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Kenichi Yoshimura, Shigetoshi Ito, Makoto Izumi, Masamichi Harada, Hiroshi Fukunaga, Naoto Hirosaki
  • Publication number: 20190127638
    Abstract: Phosphors include a CaAlSiN3 family crystal phase, wherein the CaAlSiN3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.
    Type: Application
    Filed: August 6, 2018
    Publication date: May 2, 2019
    Applicants: MITSUBISHI CHEMICAL CORPORATION, NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION, CITIZEN ELECTRONICS CO., LTD.
    Inventors: Naoto HIROSAKI, Kyota UEDA, Hajime YAMAMOTO
  • Publication number: 20190112526
    Abstract: A phosphor, combined with LED having not exceeding 470 nm, of high emission intensity and with chemical and thermal stability is provided. The phosphor according to the present invention comprises an inorganic compound in which element A (A is one or two or more kinds of elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb) is solid solved in an inorganic crystal including at least metal element M and non-metal element X and represented by MnXn+1 (3?n?5), an inorganic crystal having the same crystal structure, or an inorganic crystal including a solid solution thereof. Here, M comprises at least Al and Si, and if necessary element L (L is a metal element other than Al and Si) and X comprises N, O if necessary, and element Z if necessary (Z is a non-metal element other than N and O).
    Type: Application
    Filed: March 27, 2017
    Publication date: April 18, 2019
    Applicant: National Institute for Materials Science
    Inventors: Naoto Hirosaki, Yuichi Michiue, Shiro Funahashi, Takashi Takeda
  • Patent number: 10214689
    Abstract: Provided are a fluorescent material including a high light emission intensity and a light emitting device using the same. The present fluorescent material includes at least an A element, a M element, a D element, a E element, and an X element, wherein the A element is at least one element selected from the group consisting of Sr, Mg, Ca, and Ba; the M element is at least one element selected from the group consisting of Eu, Mn, Ce, Pr, Nd, Sm, Tb, Dy, and Yb; the D element is at least one element selected from the group consisting of Si, Ge, Sn, Ti, Zr, and Hf, the E element is at least one element selected from the group consisting of Al, B, Ga, In, Sc, Y, and La; the X element is at least one element selected from the group consisting of O, N, and F; and a molar ratio of the M element to the sum of the A element and the M element [M/(A+M)] is 0.06 or less.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: February 26, 2019
    Assignees: NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION
    Inventors: Naoto Hirosaki, Takashi Takeda, Shiro Funahashi, Takayuki Shinohara, Shoji Hosokawa
  • Patent number: 10072207
    Abstract: Phosphors include a CaAlSiN3 family crystal phase, wherein the CaAlSiN3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: September 11, 2018
    Assignees: MITSUBISHI CHEMICAL CORPORATION, NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION, CITIZEN ELECTRONICS CO. LTD.
    Inventors: Naoto Hirosaki, Kyota Ueda, Hajime Yamamoto
  • Publication number: 20180171223
    Abstract: Provided are a fluorescent material having a high light emission intensity, a method for producing the same, and a light emitting device using the same. The present fluorescent material includes a composition represented by formula (I): SiuEuvAlwOxNy, wherein when the sum of a parameter u and a parameter w is taken as 13, parameters u, v, w, x, and y in the formula (I) satisfy the following formulae (1) to (5). 2.77?u?2.88??(1) 0.04?v?0.08??(2) 10.12?w?10.23??(3) 0.42?x?0.95??(4) 12.89?y?13.
    Type: Application
    Filed: December 15, 2017
    Publication date: June 21, 2018
    Applicants: NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION
    Inventors: Naoto HIROSAKI, Takayuki SHINOHARA, Shoji HOSOKAWA
  • Publication number: 20180171222
    Abstract: Provided are a fluorescent material including a high light emission intensity and a light emitting device using the same. The present fluorescent material includes at least an A element, a M element, a D element, a E element, and an X element, wherein the A element is at least one element selected from the group consisting of Sr, Mg, Ca, and Ba; the M element is at least one element selected from the group consisting of Eu, Mn, Ce, Pr, Nd, Sm, Tb, Dy, and Yb; the D element is at least one element selected from the group consisting of Si, Ge, Sn, Ti, Zr, and Hf, the E element is at least one element selected from the group consisting of Al, B, Ga, In, Sc, Y, and La; the X element is at least one element selected from the group consisting of O, N, and F; and a molar ratio of the M element to the sum of the A element and the M element [M/(A+M)] is 0.06 or less.
    Type: Application
    Filed: December 15, 2017
    Publication date: June 21, 2018
    Applicants: NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION
    Inventors: Naoto HIROSAKI, Takashi TAKEDA, Shiro FUNAHASHI, Takayuki SHINOHARA, Shoji HOSOKAWA
  • Publication number: 20180127648
    Abstract: Provided are a phosphor, a manufacture thereof, and an illuminating device and an image display device using same which has excellent blue excitation characteristics of at least 440 nm and not exceeding 449 nm. The phosphor of the present invention includes an inorganic compound in which an AlON crystal, an AlON solid solution crystal, or an inorganic crystal having a same crystal structure as AlON, includes at least Mn and an A element (where the A element is a monovalent metal element) and, if necessary, a D element (where the D element is an element other than Mn, the A element, Al, O, and N) wherein, upon irradiation of an excitation source, the phosphor emits fluorescence having a peak wavelength in a range of at least 490 nm and not exceeding 550 nm.
    Type: Application
    Filed: May 13, 2016
    Publication date: May 10, 2018
    Applicant: National Institute for Materials Science
    Inventor: Naoto Hirosaki
  • Publication number: 20180127647
    Abstract: Provided are a light-emitting instrument, and an image display device utilizing an AlON phosphor and having wide color gamut. The light-emitting instrument includes an emission source emitting light having a wavelength from 410 nm to 470 nm and a phosphor or a light-transmitting body where the phosphor is dispersed, and the phosphor includes an inorganic compound where an AlON crystal, an AlON solid solution crystal, or an inorganic crystal having a crystal structure identical to AlON includes at least Mn, an A element(a monovalent metal element) it necessary, a D element (a divalent metal element) if necessary, an E element (a monovalent anion) if necessary, and a G element (one or more elements other than Mn, the A, Al, O, N, the D, or the E) if necessary, and emits fluorescence having a peak wavelength from 515 nm to 541 nm upon irradiation of an excitation source.
    Type: Application
    Filed: May 13, 2016
    Publication date: May 10, 2018
    Applicant: National Institute for Materials Science
    Inventor: Naoto Hirosaki
  • Patent number: 9909060
    Abstract: Provided are an oxynitride phosphor comprising a JEM crystal as a main component and being characterized by light-emitting properties (light emission color or excitation property, light emission spectrum) that is different from the known JEM phosphor, and an application thereof. The phosphor of the present invention comprises the JEM crystal activated with Eu and represented by MAl(Si, Al)6(O, N)10 (where the M element is one or more elements selected from the group consisting of Ca, Sr, Eu, La, Sc, Y, and lanthanoid elements; and includes at least Eu as well as Ca and/or Sr).
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: March 6, 2018
    Assignee: National Institute for Materials Science
    Inventors: Naoto Hirosaki, Takashi Takeda, Shiro Funahashi, Eiichirou Narimatsu
  • Patent number: 9828547
    Abstract: A phosphor having different light emission characteristics from the conventional phosphor, having high emission intensity and chemical and thermal stability, combined with LED of less than 450 nm. This phosphor includes an inorganic compound comprising: a crystal represented by Ba1Si4Al3N9, an inorganic crystal having the same crystal structure as Ba1Si4Al3N9 crystal, or a solid solution crystal thereof, comprising A element, D element, E element, and X element (A is one or more elements selected from Li, Mg, Ca, Sr, Ba, and La; D is one or more elements selected from Si, Ge, Sn, Ti, Zr, and Hf; E is one or more elements selected from B, Al, Ga, In, Sc, and Y; X is one or more elements selected from O, N, and F), into which M element is solid-solved (M is one or more elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb).
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: November 28, 2017
    Assignee: National Institute for Materials Science
    Inventors: Naoto Hirosaki, Takashi Takeda, Shiro Funahashi, Eiichirou Narimatsu
  • Publication number: 20170283261
    Abstract: Phosphors include a CaAlSiN3 family crystal phase, wherein the CaAlSiN3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.
    Type: Application
    Filed: June 19, 2017
    Publication date: October 5, 2017
    Applicants: MITSUBISHI CHEMICAL CORPORATION, NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION, CITIZEN ELECTRONICS CO., LTD.
    Inventors: Naoto HIROSAKI, Kyota UEDA, Hajime YAMAMOTO
  • Publication number: 20170279012
    Abstract: A light-emitting device includes a light-emitting element that emits blue light, a Mn2+-activated ?-AlON green phosphor, and a dispersing material in which the green phosphor is dispersed. The green phosphor has an in-crystal Mn concentration of 2.5 wt % or more. The shortest path of the blue light through the dispersing material is 1 mm long or shorter.
    Type: Application
    Filed: March 2, 2017
    Publication date: September 28, 2017
    Inventors: Kenichi YOSHIMURA, Makoto IZUMI, Hiroshi FUKUNAGA, Naoto HIROSAKI
  • Patent number: 9741908
    Abstract: A wavelength converting member includes silica glass and a plurality of fluorescent material particles including an oxynitride or nitride fluorescent material and dispersed in the silica glass. The plurality of fluorescent material particles include at least two kinds of fluorescent material particles including (i) first fluorescent material particles that emit a fluorescence having a first peak wavelength and (ii) second fluorescent material particles that emit a fluorescence having a second peak wavelength. The wavelength converting member has a density within a range from 0.8 g/cm3 to 1.2 g/cm3.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: August 22, 2017
    Assignees: SHARP KABUSHIKI KAISHA, NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Kenichi Yoshimura, Makoto Izumi, Masamichi Harada, Hiroshi Fukunaga, Kazunori Annen, Naoto Hirosaki, Hiroyo Segawa
  • Patent number: 9738829
    Abstract: Phosphors include a CaAlSiN3 family crystal phase, wherein the CaAlSiN3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: August 22, 2017
    Assignees: MITSUBISHI CHEMICAL CORPORATION, National Institute for Materials Science, Nichia Corporation, Citizen Electronics CO., Ltd.
    Inventors: Naoto Hirosaki, Kyota Ueda, Hajime Yamamoto
  • Patent number: 9677000
    Abstract: A fluorophor includes: ?-type sialon crystal which is expressed by a general formula: (Lix1, Eux2)(Si12?(m+n)Alm+n)(OnN16?n), wherein x1 is an amount of solid solution of Li in a sialon unit cell, and x2 is an amount of solid solution of Eu in the sialon unit cell, wherein the parameters x1, x2, m, and n satisfy: 1.6?x1?2.4 (1), 0.001?x2?0.4 (2), 1.8?m?2.4 (3), 0.8?n?1.2 (4), wherein the ?-type sialon crystal emits fluorescence with a peak in a wavelength region of from 550 nm to 575 nm upon irradiation of an excitation source.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: June 13, 2017
    Assignee: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Naoto Hirosaki, Rong-Jun Xie, Mamoru Mitomo
  • Patent number: 9670405
    Abstract: A production method of a phosphor includes firing a starting material mixture in a nitrogen atmosphere at a temperature range between 1,500° C. inclusive and 2,200° C. inclusive. The starting material mixture is a mixture of metallic compounds, and is capable of constituting a composition including M, A, Al, O, and N (M is Eu; and A is one kind or two or more kinds of element(s) selected from C, Si, Ge, Sn, B, Ga, In, Mg, Ca, Sr, Ba, Sc, Y, La, Gd, Lu, Ti, Zr, Hf, Ta, and W) by firing.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: June 6, 2017
    Assignee: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventor: Naoto Hirosaki