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).
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Publication number: 20190062631Abstract: 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: ApplicationFiled: January 13, 2017Publication date: February 28, 2019Applicant: Denka Company LimitedInventors: Keita KOBAYASHI, Hideyuki EMOTO
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Publication number: 20180282620Abstract: 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: ApplicationFiled: September 30, 2016Publication date: October 4, 2018Inventors: Masayoshi Ichikawa, Hideyuki Emoto, Ryosuke Kondo
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Publication number: 20180094188Abstract: 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: ApplicationFiled: September 29, 2017Publication date: April 5, 2018Inventors: Hideyuki Emoto, Motonori Kino, Masayoshi Ichikawa
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Publication number: 20180086973Abstract: 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: ApplicationFiled: January 19, 2016Publication date: March 29, 2018Inventors: Ryosuke KONDO, Masayoshi ICHIKAWA, Hideyuki EMOTO, Motoi TANAKA
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Publication number: 20180072946Abstract: 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: ApplicationFiled: January 27, 2016Publication date: March 15, 2018Inventors: Hideyuki EMOTO, Motoi TANAKA, Kazuhiro ITO
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Publication number: 20180016494Abstract: 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: ApplicationFiled: February 17, 2016Publication date: January 18, 2018Inventors: Masayoshi Ichikawa, Ryosuke Kondo, Hideyuki Emoto, Motoi Tanaka
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Publication number: 20180002601Abstract: 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: ApplicationFiled: June 30, 2017Publication date: January 4, 2018Inventors: Hideyuki EMOTO, Toshiaki NAGUMO
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Patent number: 9676999Abstract: The present invention relates to an Mn4+-activated complex fluoride phosphor with improved moisture resistance due to modification of the particle surface, and a light emitting element and light emitting device having excellent color rendering properties and stability due to the use of this phosphor. The phosphor of the present invention is characterized in that it is represented by the general formula: A2MF6:Mn4+, wherein element A is an alkali metal element comprising at least K, element M is one or more metal elements chosen from among Si, Ge, Sn, Ti, Zr and Hf, F is fluorine, and Mn is manganese, wherein the phosphor comprises Ca in a concentration range of at least 20 ppm and at most 10,000 ppm or Cl in a concentration range of at least 20 ppm and at most 300 ppm.Type: GrantFiled: February 25, 2015Date of Patent: June 13, 2017Assignee: DENKA COMPANY LIMITEDInventors: Hideyuki Emoto, Shinichi Yanagi, Masayoshi Ichikawa, Kazuhiro Ito
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Patent number: 9680066Abstract: The present invention relates to an Mn4+-activated complex fluoride phosphor with improved moisture resistance due to modification of the particle surface, and a light emitting element and light emitting device having excellent color rendering properties and stability due to the use of this phosphor. The phosphor of the present invention is characterized in that it is represented by the general formula: A2MF6:Mn4+, wherein element A is an alkali metal element comprising at least K, element M is one or more metal elements chosen from among Si, Ge, Sn, Ti, Zr and Hf, F is fluorine, and Mn is manganese, wherein the phosphor comprises a Ca-containing compound on a particle surface.Type: GrantFiled: February 25, 2015Date of Patent: June 13, 2017Assignee: DENKA COMPANY LIMITEDInventors: Hideyuki Emoto, Shinichi Yanagi, Masayoshi Ichikawa, Kazuhiro Ito
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Patent number: 9663713Abstract: Provided is a Li-solid-solubilized ?-SiAlON phosphor containing Li+ solid-solubilized for stabilization of the structure which is higher in luminous efficiency than any phosphor currently available and a light-emitting element and a lighting device comprising the same. An Eu-activated Li-solid-solubilized ?-SiAlON, having a lattice constant a of 0.7820 to 0.7835 nm, a lattice constant c of 0.5645 to 0.5670 nm, an oxygen content of 0.4 to 1.2 mass %, and an europium (Eu) content of 0.3 to 1.2 mass %, and emitting a light having a peak wavelength of 580 to 595 nm in the fluorescence spectrum obtained when it is excited by a monochromatic light having a peak wavelength in the range of 450 to 460 nm.Type: GrantFiled: October 30, 2013Date of Patent: May 30, 2017Assignee: DENKA COMPANY LIMITEDInventor: Hideyuki Emoto
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Publication number: 20170009133Abstract: The present invention relates to an Mn4+-activated complex fluoride phosphor with improved moisture resistance due to modification of the particle surface, and a light emitting element and light emitting device having excellent color rendering properties and stability due to the use of this phosphor. The phosphor of the present invention is characterized in that it is represented by the general formula: A2MF6:Mn4+, wherein element A is an alkali metal element comprising at least K, element M is one or more metal elements chosen from among Si, Ge, Sn, Ti, Zr and Hf, F is fluorine, and Mn is manganese, wherein the phosphor comprises Ca in a concentration range of at least 20 ppm and at most 10,000 ppm or Cl in a concentration range of at least 20 ppm and at most 300 ppm.Type: ApplicationFiled: February 25, 2015Publication date: January 12, 2017Inventors: Hideyuki EMOTO, Shinichi YANAGI, Masayoshi ICHIKAWA, Kazuhiro ITO
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Publication number: 20170012181Abstract: The present invention relates to an Mn4|-activated complex fluoride phosphor with improved moisture resistance due to modification of the particle surface, and a light emitting element and light emitting device having excellent color rendering properties and stability due to the use of this phosphor. The phosphor of the present invention is characterized in that it is represented by the general formula: A2MF6:Mn4?, wherein element A is an alkali metal element comprising at least K, element M is one or more metal elements chosen from among Si, Ge, Sn, Ti, Zr and Hf, F is fluorine, and Mn is manganese, wherein the phosphor comprises a Ca-containing compound on a particle surface.Type: ApplicationFiled: February 25, 2015Publication date: January 12, 2017Inventors: Hideyuki EMOTO, Shinichi YANAGI, Masayoshi ICHIKAWA, Kazuhiro ITO
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Publication number: 20160280994Abstract: 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: ApplicationFiled: November 12, 2013Publication date: September 29, 2016Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHAInventor: Hideyuki EMOTO
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Publication number: 20160280993Abstract: Provided is a Li-solid-solubilized ?-SiAlON phosphor containing Li+ solid-solubilized for stabilization of the structure which is higher in luminous efficiency than any phosphor currently available and a light-emitting element and a lighting device comprising the same. An Eu-activated Li-solid-solubilized ?-SiAlON, having a lattice constant a of 0.7820 to 0.7835 nm, a lattice constant c of 0.5645 to 0.5670 nm, an oxygen content of 0.4 to 1.2 mass %, and an europium (Eu) content of 0.3 to 1.2 mass %, and emitting a light having a peak wavelength of 580 to 595 nm in the fluorescence spectrum obtained when it is excited by a monochromatic light having a peak wavelength in the range of 450 to 460 nm.Type: ApplicationFiled: October 30, 2013Publication date: September 29, 2016Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHAInventor: Hideyuki EMOTO
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Patent number: 9382475Abstract: The present invention provides: a phosphor which can be combined with a blue LED to emit white light having a low color temperature as in the case where the phosphor is used singly, has a broad fluorescence spectrum, high light emission efficiency, and thermal/chemical stability, and rarely undergoes the deterioration in brightness at higher temperatures. This phosphor is represented by the general formula: Mx(Si,Al)2(N,O)3±y (wherein M independently represent Li or at least one alkali earth metal element; and x and y fulfill the requirement represented by the formulae: 0.52?x?0.9 and 0?y?0.3) wherein some of M are substituted by element Ce, and wherein the Si/Al atomic ratio is 1.5 to 6 inclusive, the O/N atomic ratio is 0 to 0.1 inclusive, 5-50 mol % of M's is Li, and 0.5-10 mol % of M is Ce.Type: GrantFiled: November 16, 2011Date of Patent: July 5, 2016Assignee: DENKA COMPANY LIMITEDInventor: Hideyuki Emoto
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Patent number: 9309460Abstract: Provided are: a phosphor that has a crystal structure identical to a CaAlSiN3 crystal phase, which absorbs light of a light emitting element such as an LED and emits red light, as a host crystal and exhibits luminous efficiency more excellent than those of conventional phosphors; and a light emitting device which has high luminance and long service life by the use of this phosphor. A powder phosphor, which is represented by general formula Cax(Si,Al)2(N,O)3+y (wherein 0.75?x?0.92 and ?0.2?y?0.2), and wherein some of Ca element is substituted by Eu element. This powder phosphor has an Si/Al ratio (molar ratio) of from 0.9 to 1.55 (inclusive), an Eu content of from 0.01 at % to 0.3 at % (inclusive), and an amount of intragranular solid-solved oxygen of from 0.4% by mass to 0.7% by mass (inclusive).Type: GrantFiled: November 2, 2012Date of Patent: April 12, 2016Assignee: DENKA COMPANY LIMITEDInventors: Hideyuki Emoto, Hiroaki Toyoshima
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Patent number: 9139769Abstract: ?-Sialon comprising Eu2+ that is present in a solid solution form in ?-sialon represented by Si6-zAlzOzN ?m [wherein z is 0.3-1.5], which shows, when excited with light of 450 nm in wavelength, a peak wavelength of fluorescent spectrum of 545-560 nm, a half-value breadth of 55 nm or greater, and an external quantum efficiency of 45% or greater. The ?-sialon can be produced by blending at least one kind of oxide selected from aluminum oxide and silicon oxide with silicon nitride and aluminum nitride in such a manner as to give z of 0.3-1.5, further adding thereto a europium compound and a ?-sialon powder having an average particle diameter of 5 ?m or greater and an average degree of circularity of 0.7 or greater, each in a definite amount, and baking the mixture.Type: GrantFiled: November 4, 2010Date of Patent: September 22, 2015Assignee: DENKI KAGAKU KOGYO KABUSHIKI KAISHAInventors: Hideyuki Emoto, Kazuhiro Ito
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Patent number: 9028719Abstract: An object of the present invention is to provide a phosphor that is combined with a blue LED to achieve white light at a low color temperature as if singly, has a broad fluorescence spectrum for excellent color rendering properties, has a high luminous efficiency, is thermally and chemically stable like conventional nitride-based phosphors, and has a small decrease in luminance at high temperatures. Another object of the present invention is to provide a light emitting device using such a phosphor. The present invention relates to a ?-sialon that is expressed by the general formula, Si6-zAlzOzN8-z:Eu (0<z<4.2). In the ?-sialon, P2/P1 is not lower than 0.5 and not higher than 1000 (P1 representing the height of an absorption line appearing in the region where g is 2.00±0.02 in a first derivative spectrum obtained by an electron spin resonance technique at 25° C., P2 representing the difference between the maximum value and the minimum value in a spectrum on the lower magnetic field side of P1).Type: GrantFiled: April 21, 2011Date of Patent: May 12, 2015Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Hideyuki Emoto, Toshiaki Nagumo
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Patent number: 9000664Abstract: Provided is a phosphor particle group of divalent europium-activated oxynitride green light emitting phosphor particles each of which is a ?-type SiAlON represented by a general formula: EuaSibAlcOdNe, where 0.005?a?0.4, b+c=12, d+e=16, wherein a mean value of a value obtained by dividing a longer particle diameter by a shorter particle diameter is not greater than 1.75. Also provided are a light emitting apparatus using the phosphor particle group in a light converter, and a liquid crystal display television using the light emitting apparatus. With these, a high-efficiency and stable light emitting apparatus using a ?-type SiAlON, and a phosphor particle group therefor are provided.Type: GrantFiled: April 2, 2010Date of Patent: April 7, 2015Assignees: Sharp Kabushiki Kaisha, Denki Kagaku Kogyo Kabushiki KaishaInventors: Tetsuya Hanamoto, Masatsugu Masuda, Kenji Terashima, Hideyuki Emoto, Hironori Nagasaki
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Publication number: 20150042222Abstract: Provided are: a phosphor that has a crystal structure identical to a CaAlSiN3 crystal phase, which absorbs light of a light emitting element such as an LED and emits red light, as a host crystal and exhibits luminous efficiency more excellent than those of conventional phosphors; and a light emitting device which has high luminance and long service life by the use of this phosphor. A powder phosphor, which is represented by general formula Cax(Si,Al)2(N,O)3+y (wherein 0.75?x?0.92 and ?0.2?y?0.2), and wherein some of Ca element is substituted by Eu element. This powder phosphor has an Si/Al ratio (molar ratio) of from 0.9 to 1.55 (inclusive), an Eu content of from 0.01 at % to 0.3 at % (inclusive), and an amount of intragranular solid-solved oxygen of from 0.4% by mass to 0.7% by mass (inclusive).Type: ApplicationFiled: November 2, 2012Publication date: February 12, 2015Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHAInventors: Hideyuki Emoto, Hiroaki Toyoshima