Patents by Inventor Hideyuki Emoto

Hideyuki Emoto 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).

  • Publication number: 20220350061
    Abstract: A phosphor plate including a base material, and a plate-shaped composite including phosphors dispersed in the base material, in which in a case in which an absorption spectrum of light having a wavelength of 300 nm to 700 nm is measured, when an absorbance at 455 nm is defined as A455(%), an absorbance at 700 nm is defined as A700(%), and a thickness of the phosphor plate is defined as T (mm), (A700/A455)/T satisfies 0.01 or more and 1.00 or less.
    Type: Application
    Filed: June 22, 2020
    Publication date: November 3, 2022
    Applicant: DENKA COMPANY LIMITED
    Inventors: Taiyo YAMAURA, Yuki KUBOTA, Kazuhiro ITO, Hideyuki EMOTO
  • Publication number: 20220251444
    Abstract: A phosphor plate including a base material, and a plate-shaped composite including phosphors dispersed in the base material, in which a main component of the base material is alumina, the phosphor includes an ?-type sialon phosphor, and L* value satisfies 73.5 or more and 85.0 or less, a* value satisfies 4.4 or more and 8.0 or less, and b* value satisfies 10.8 or more and 13.0 or less in L*a*b* color coordinates of the phosphor plate in a case of being measured in accordance with JIS Z 8781-4.
    Type: Application
    Filed: June 22, 2020
    Publication date: August 11, 2022
    Applicant: DENKA COMPANY LIMITED
    Inventors: Taiyo YAMAURA, Yuki KUBOTA, Kazuhiro ITO, Hideyuki EMOTO
  • Patent number: 11114589
    Abstract: Provided is a fluoride phosphor that has a good external quantum efficiency and is suitable for stably producing white LEDs. The fluoride phosphor has a composition represented by a general formula (1) and a repose angle of 30° or more and 60° or less. general formula: A2M(1-n)F6:Mn4+n (1), wherein 0<n?0.1, the element A is one or more alkali metal elements including at least K, and the element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: September 7, 2021
    Assignee: Denka Company Limited
    Inventors: Masayoshi Ichikawa, Ryosuke Kondo, Hideyuki Emoto
  • Patent number: 10982139
    Abstract: Provided is a fluoride phosphor that has a good external quantum efficiency and is suitable for stably producing white LEDs. The fluoride phosphor having a composition represented by a general formula (1), a bulk density of 0.80 g/cm3 or more, and a mass median diameter (D50) of 30 ?m or less: general formula: A2M(1-n)F6:Mn4+n (1), wherein 0<n?0.1, the element A is one or more alkali metal elements including at least K, and the element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: April 20, 2021
    Assignee: Denka Company Limited
    Inventors: Masayoshi Ichikawa, Ryosuke Konda, Hideyuki Emoto
  • Patent number: 10947450
    Abstract: Provided is a fluoride phosphor that has a good external quantum efficiency and is suitable for stably producing white LEDs. The fluoride phosphor having a composition represented by a general formula (1), a bulk density of 0.80 g/cm3 or more, and a mass median diameter (D50) of 30 ?m or less: general formula: A2M(1-n)F6:Mn4+n (1), wherein 0<n?0.1, the element A is one or more alkali metal elements including at least K, and the element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: March 16, 2021
    Assignee: Denka Company Limited
    Inventors: Masayoshi Ichikawa, Ryosuke Konda, Hideyuki Emoto
  • Patent number: 10941339
    Abstract: The purpose of the present invention is to provide a fluoride phosphor (represented by the general formula A2SiF6:Mn) having high luminescence intensity and reliability, a high-luminance light-emitting device using this phosphor, and a production method for this phosphor. The production method for a fluoride phosphor represented by the general formula A2SiF6:Mn (where element A is an alkali metal element including at least potassium), wherein the fluoride phosphor production method comprises: a step of preparing an aqueous solution wherein element A and fluorine are dissolved in a solvent; and a step of adding, to the aqueous solution, solid silicon dioxide and a manganese compound that supplies manganese having a valence other than +7; wherein an added amount of the manganese compound is within a range such that an Mn content in the fluoride phosphor becomes at least 0.1 mass % and at most 1.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: March 9, 2021
    Assignee: Denka Company Limited
    Inventors: Masayoshi Ichikawa, Hideyuki Emoto, Ryosuke Kondo
  • Patent number: 10759995
    Abstract: The present invention relates to a process for producing a composite-fluoride fluorescent material represented by the general formula A2MF6:Mn4+ (wherein A is at least one alkali metal element including K; M is one or more metallic elements including at least Si or Ge and selected from among Si, Ge, Sn, Ti, Zr, and Hf; F is fluorine; and Mn is manganese). With the production process, it is possible to obtain a fluorescent material which is high in absorptance, internal quantum efficiency, and external quantum efficiency and has excellent optical properties.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: September 1, 2020
    Assignee: DENKA COMPANY LIMITED
    Inventors: Masayoshi Ichikawa, Ryosuke Kondo, Hideyuki Emoto, Motoi Tanaka
  • Patent number: 10669476
    Abstract: The purpose of the present invention is to provide a potassium fluoromanganate for use as a raw material for a manganese-activated complex fluoride phosphor, from which a manganese-activated complex fluoride phosphor having good fluorescence properties and reliability can be produced. The potassium fluoromanganate of the present invention is characterized in that, in an orbital electron binding energy spectrum diagram for manganese obtained by X-ray photoelectron spectroscopy, a ratio (signal intensity value A/signal intensity value B) between a signal intensity value A obtained by subtracting a background value from a maximum signal intensity value for binding energy values within the range from 643.0 eV or more to 644.0 eV or less, and a signal intensity value B obtained by subtracting the background value from a maximum signal intensity value for binding energy values within the range from 645.0 eV or more to 646.0 eV or less, is greater than 0 and no greater than 0.9.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: June 2, 2020
    Assignee: DENKO COMPANY LIMITED
    Inventors: Hideyuki Emoto, Motonori Kino, Masayoshi Ichikawa
  • Publication number: 20200135983
    Abstract: Provided is a fluoride phosphor that has a good external quantum efficiency and is suitable for stably producing white LEDs. The fluoride phosphor has a composition represented by a general formula (1) and a repose angle of 30° or more and 60° or less. general formula: A2M(1-n)F6:Mn4+n (1), wherein 0<n?0.1, the element A is one or more alkali metal elements including at least K, and the element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.
    Type: Application
    Filed: June 12, 2018
    Publication date: April 30, 2020
    Applicant: Denka Company Limited
    Inventors: Masayoshi ICHIKAWA, Ryosuke KONDA, Hideyuki EMOTO
  • Patent number: 10611956
    Abstract: Provided is a phosphor represented by the general formula: A2MF6:Mn. The elements A each represents an alkali metal element, the element M represents one or more tetravalent metallic elements selected from Si, Ge, Sn, Ti, Zr and Hf. The phosphor has a minimal light absorption rate in a wavelength range of 300 nm or more and 350 nm or less of 67% or less, and a maximum light absorption rate in a wavelength range of 400 nm or more and 500 nm or less of 65% or more. The phosphor has a Mn content of 0.3% by mass or more and 1.5% by mass or less.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: April 7, 2020
    Assignee: Denka Company Limited
    Inventors: Hideyuki Emoto, Motoi Tanaka, Kazuhiro Ito
  • Publication number: 20200095501
    Abstract: Provided is a fluoride phosphor that has a good external quantum efficiency and is suitable for stably producing white LEDs. The fluoride phosphor having a composition represented by a general formula (1), a bulk density of 0.80 g/cm3 or more, and a mass median diameter (D50) of 30 ?m or less: general formula: A2M(1?n)F6:Mn4+n (1), wherein 0<n?0.1, the element A is one or more alkali metal elements including at least K, and the element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.
    Type: Application
    Filed: June 12, 2018
    Publication date: March 26, 2020
    Applicant: Denka Company Limited
    Inventors: Masayoshi ICHIKAWA, Ryosuke KONDA, Hideyuki EMOTO
  • Patent number: 10266768
    Abstract: Provided is a ?-sialon phosphor having a ?-sialon as a host crystal and containing Eu as a luminescent center, wherein when chemical states of Eu are classified into three states: Eu2+, Eu3+ and an intermediate state thereof (hereinafter, referred to as Eum), a ratio of them present in the ?-sialon phosphor satisfies the relationships: 0.1<Eum/(Eu2++Eu3++Eum)<0.4 and Eu2+/(Eu2++Eu3+)>0.7.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: April 23, 2019
    Assignee: DENKA COMPANY LIMITED
    Inventors: Hideyuki Emoto, Toshiaki Nagumo
  • Patent number: 10266766
    Abstract: Provided is a Li-solid-solubilized ?-SiAlON phosphor containing Li+ as solid solubilized for stabilization of the structure that is higher in luminous efficiency than before and a light-emitting element and a lighting device comprising the same. The (Li and Eu)-containing ?-SiAlON crystal has a Li content of 1.8 to 3 mass %, an Eu content of 0.1 to 1.5 mass % and an average particle diameter, as determined by laser diffraction/scattering method, of 7 to 35 ?m. The phosphor is used in the light-emitting element and the lighting device.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: April 23, 2019
    Assignee: DENKA COMPANY LIMITED
    Inventor: Hideyuki Emoto
  • Publication number: 20190062631
    Abstract: Provided are a phosphor having long-term reliability and high luminance, and a white light emitting device using the phosphor. In a ?-type SiAlON phosphor (a), the volume median particle size D50 [?m] and the average particle size R [?m] calculated from a surface area measured by an air permeability method satisfy the following formula (1): D50/R<1.
    Type: Application
    Filed: January 13, 2017
    Publication date: February 28, 2019
    Applicant: Denka Company Limited
    Inventors: Keita KOBAYASHI, Hideyuki EMOTO
  • Publication number: 20180282620
    Abstract: The purpose of the present invention is to provide a fluoride phosphor (represented by the general formula A2SiF6:Mn) having high luminescence intensity and reliability, a high-luminance light-emitting device using this phosphor, and a production method for this phosphor. The production method for a fluoride phosphor represented by the general formula A2SiF6:Mn (where element A is an alkali metal element including at least potassium), wherein the fluoride phosphor production method comprises: a step of preparing an aqueous solution wherein element A and fluorine are dissolved in a solvent; and a step of adding, to the aqueous solution, solid silicon dioxide and a manganese compound that supplies manganese having a valence other than +7; wherein an added amount of the manganese compound is within a range such that an Mn content in the fluoride phosphor becomes at least 0.1 mass % and at most 1.
    Type: Application
    Filed: September 30, 2016
    Publication date: October 4, 2018
    Inventors: Masayoshi Ichikawa, Hideyuki Emoto, Ryosuke Kondo
  • Publication number: 20180094188
    Abstract: The purpose of the present invention is to provide a potassium fluoromanganate for use as a raw material for a manganese-activated complex fluoride phosphor, from which a manganese-activated complex fluoride phosphor having good fluorescence properties and reliability can be produced. The potassium fluoromanganate of the present invention is characterized in that, in an orbital electron binding energy spectrum diagram for manganese obtained by X-ray photoelectron spectroscopy, a ratio (signal intensity value A/signal intensity value B) between a signal intensity value A obtained by subtracting a background value from a maximum signal intensity value for binding energy values within the range from 643.0 eV or more to 644.0 eV or less, and a signal intensity value B obtained by subtracting the background value from a maximum signal intensity value for binding energy values within the range from 645.0 eV or more to 646.0 eV or less, is greater than 0 and no greater than 0.9.
    Type: Application
    Filed: September 29, 2017
    Publication date: April 5, 2018
    Inventors: Hideyuki Emoto, Motonori Kino, Masayoshi Ichikawa
  • Publication number: 20180086973
    Abstract: Provided is a phosphor that emits red light, is represented by the general formula, A2MF6:Mn, and exhibits little reduction in intensity even when exposed to a high-temperature, high-humidity atmosphere over a long period of time. Also provided is a light-emitting device using said phosphor. The present invention is a phosphor in which the main crystal phase thereof is represented by the general formula, A2MF6:Mn. The element A is an alkali metal element including at least K, and the element M is one or more tetravalent elements selected from the group consisting of Si, Ge, Sn, Ti, Zr, and Hf. The phosphor has a coating layer on the surface thereof. The coating layer is a hydrophobic organic substance having a hydrophobicity of 10% or more.
    Type: Application
    Filed: January 19, 2016
    Publication date: March 29, 2018
    Inventors: Ryosuke KONDO, Masayoshi ICHIKAWA, Hideyuki EMOTO, Motoi TANAKA
  • Publication number: 20180072946
    Abstract: Provided is a phosphor represented by the general formula: A2MF6:Mn. The elements A each represents an alkali metal element, the element M represents one or more tetravalent metallic elements selected from Si, Ge, Sn, Ti, Zr and Hf. The phosphor has a minimal light absorption rate in a wavelength range of 300 nm or more and 350 nm or less of 67% or less, and a maximum light absorption rate in a wavelength range of 400 nm or more and 500 nm or less of 65% or more. The phosphor has a Mn content of 0.3% by mass or more and 1.5% by mass or less.
    Type: Application
    Filed: January 27, 2016
    Publication date: March 15, 2018
    Inventors: Hideyuki EMOTO, Motoi TANAKA, Kazuhiro ITO
  • Publication number: 20180016494
    Abstract: The present invention relates to a process for producing a composite-fluoride fluorescent material represented by the general formula A2MF6:Mn4+ (wherein A is at least one alkali metal element including K; M is one or more metallic elements including at least Si or Ge and selected from among Si, Ge, Sn, Ti, Zr, and Hf; F is fluorine; and Mn is manganese). With the production process, it is possible to obtain a fluorescent material which is high in absorptance, internal quantum efficiency, and external quantum efficiency and has excellent optical properties.
    Type: Application
    Filed: February 17, 2016
    Publication date: January 18, 2018
    Inventors: Masayoshi Ichikawa, Ryosuke Kondo, Hideyuki Emoto, Motoi Tanaka
  • Publication number: 20180002601
    Abstract: Provided is a ?-sialon phosphor having a ?-sialon as a host crystal and containing Eu as a luminescent center, wherein when chemical states of Eu are classified into three states: Eu2+, Eu3+ and an intermediate state thereof (hereinafter, referred to as Eum), a ratio of them present in the ?-sialon phosphor satisfies the relationships: 0.1<Eum/(Eu2++Eu3++Eum)<0.4 and Eu2+/(Eu2++Eu3+)>0.7.
    Type: Application
    Filed: June 30, 2017
    Publication date: January 4, 2018
    Inventors: Hideyuki EMOTO, Toshiaki NAGUMO