Abstract: A phosphor powder including phosphor particles of a phosphor represented by a general formula Mx(Si, Al)2(N, O)3±y and in which a part of M is substituted with a Ce element, the phosphor powder includes phosphor particles in which a Si/AI atomic ratio is equal to or more than 1.5 and equal to or less than 6, an O/N atomic ratio is equal to or more than 0 and equal to or less than 0.1, 5 to 50 mol % of M is Li, and 0.5 to 10 mol % of M is Ce. In a case where a volume-based cumulative 10% particle size, a volume-based cumulative 50% particle size, and a volume-based cumulative 90% particle size of this phosphor powder measured by a laser diffraction scattering method are defined as D10, D50, and D90, respectively, (D90-D10)/D50 is equal to or more than 0.7 and equal to or less than 1.1.

Abstract: A phosphor powder including phosphor particles which are a phosphor represented by a general formula Mx(Si, Al)2(N, O)3±y (where M is Li and one or more alkaline earth metal elements and 0.52?x?0.9 and 0.06?y?0.36 are satisfied) and in which a part of M is substituted with a Ce element, wherein a Si/Al atomic ratio is equal to or more than 1.5 and equal to or less than 6, an O/N atomic ratio is equal to or more than 0 and equal to or less than 0.1, 5 to 50 mol % of M is Li, and 0.5 to 10 mol % of M is Ce, and a total content of a Cr element, a Fe element, and a Ni element in the phosphor powder is equal to or less than 20.0 ppm.

Abstract: A phosphor powder including phosphor particles of a phosphor which is represented by a general formula Mx(Si, Al)2(N, O)3±y (where M is Li and one or more alkaline earth metal elements and 0.52?x?0.9 and 0.06?y?0.36 are satisfied) and in which a part of M is substituted with a Ce element, the phosphor powder includes phosphor particles in which a Si/Al atomic ratio is equal to or more than 1.5 and equal to or less than 6, an O/N atomic ratio is equal to or more than 0 and equal to or less than 0.1, 5 to 50 mol % of M is Li, and 0.5 to 10 mol % of M is Ce. A light absorption A700 of this phosphor powder at a wavelength of 700 nm is equal to or less than 10%.

Abstract: A phosphor powder which is represented by a general formula Mx(Si, Al)2(N, O)3±y (where M is Li and one or more alkaline earth metal elements and 0.52?x?0.9 and 0.06?y?0.36 are satisfied) and in which a part of M is substituted with a Ce element, in which the phosphor powder includes phosphor particles in which a Si/Al atomic ratio is equal to or more than 1.5 and equal to or less than 6, an O/N atomic ratio is equal to or more than 0 and equal to or less than 0.1, 5 to 50 mol % of M is Li, and 0.5 to 10 mol % of M is Ce, and a diffuse reflectance X1 with respect to light having a wavelength of 700 nm is equal to or more than 88% and equal to or less than 99.9%.

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.

Abstract: A phosphor contains an inorganic compound in which Eu as an activator is solid-soluted in an inorganic crystal having a crystal represented by Li1Ba2Al1Si7N12 or the same crystal structure as the crystal represented by Li1Ba2Al1Si7N12, in which in an X-ray diffraction pattern of the phosphor measured using a Cu-K? ray, I1 and I2 satisfy 0<I2/I1?0.050 when a peak maximum intensity of a peak which is present at a position where a diffraction angle 2? is in a range of 31.3° or more and 31.6° or less is I1, and a peak maximum intensity of a peak which is present at a position where a diffraction angle 2? is in a range of 29.8° or more and 30.6° or less is I2.

Abstract: A phosphor plate including: a complex containing an ?-sialon phosphor and a sintered body containing spinel represented by a general formula M2xAl4-4xO6-4x (where M represents at least one of Mg, Mn, and Zn, and 0.2<x<0.6). In addition, there is provided a light emitting device including: a group III nitride semiconductor light emitting element; and the phosphor plate provided on one surface of the group III nitride semiconductor light emitting element. Further, there is provided a method for manufacturing the phosphor plate.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.