Abstract: A red phosphor represented by general formula: MSiAlN3, wherein M is at least one or more elements selected from Mg, Ca, Sr and Ba, and is partially replaced with Eu and has, as a host crystal, a crystal structure identical to that of a CaAlSiN3 crystal phase, and the phosphor has a bulk density of 0.70 g/cm3 or more and 2.30 g/cm3 or less. There is also provided a light-emitting element including the red phosphor and a semiconductor light-emitting element capable of exciting the red phosphor.

Abstract: A phosphor powder consists of a red phosphor represented by a general formula (Srx, Ca1-x-y, Euy)AlSi(N,O)3 having the same crystal phase as that of CASN. In a general formula, a relationship of x<1 and 1?x?y>0 are satisfied. In addition, a peak wavelength of a fluorescence spectrum, in a case where the phosphor powder is irradiated with blue excitation light having a wavelength of 455 nm is equal to or more than 600 nm and equal to or less than 610 nm, and a full width at half maximum of the fluorescence spectrum is equal to or less than 73 nm.

Abstract: A phosphor having a main crystal phase having a crystal structure identical to that of CaAlSiN3, and including a Ca element partially replaced with an Eu element, wherein the phosphor has a median size d50 of 12.0 ?m or more and 22.0 ?m or less, as measured according to a laser diffraction scattering method, and has a specific surface area of 1.50 m2/g or more and 10.00 m2/g or less, as measured according to a BET method.

Abstract: An ?-sialon phosphor particle containing Eu. At least one minute recess is formed on a surface of the ?-sialon phosphor particle. The ?-sialon phosphor particle is preferably produced by undergoing a raw material mixing step, a heating step, a pulverizing step, and an acid treatment step.

Abstract: The purpose of the invention is to both improve the luminance of a SCASN-based phosphor and achieve deep-color rendering properties. Provided is a red phosphor having a main crystal phase having the same crystal structure as a crystal structure of CaAlSiN3, the main crystal phase represented by the general formula MAlSiN3, wherein an internal quantum efficiency, as measured when the red phosphor is excited by light having a wavelength of 455 nm, is 71% or more, and M in the general formula represents an element group containing at least three elements selected from Eu, Sr, Mg, Ca, and Ba, the element group containing Eu, Sr, and Ca as essentials, and a Eu content is 4.5 mass % or more and 7.0 mass % or less, a Sr content is 34.0 mass % or more and 42.0 mass % or less, and a Ca content is 0.8 mass % or more and 3.0 mass % or less.

Abstract: A phosphor powder composed of ?-sialon phosphor particles containing Eu. With regard to the phosphor powder, a volume-based median diameter (D50) determined by a laser diffraction scattering method is equal to or more than 10 ?m and equal to or less than 20 ?m, and a diffuse reflectance with respect to light at a wavelength of 600 nm is equal to or more than 93% and equal to or less than 99%.

Abstract: An ?-sialon phosphor particle containing Eu. At least one slit is formed on a surface of the ?-sialon phosphor particle. The ?-sialon phosphor particle is preferably produced by undergoing a raw material mixing step, a heating step, a pulverizing step, and an acid treatment step.

Abstract: A nitride fluorescent material represented by General Formula: MAlSiN3 (M=Ca, Sr) in which a part of M is substituted with Eu and a main crystal phase has the same structure as that of a CaAlSiN3 crystal phase, in which a light emission peak wavelength is 640 nm or more, and a half width of the light emission peak wavelength is 80 nm or less.

Abstract: A phosphor powder composed of ?-sialon phosphor particles containing Eu. With regard to the phosphor powder, a volume-based median diameter (D50) determined by a laser diffraction scattering method is equal to or more than 10 ?m and equal to or less than 20 ?m, and a diffuse reflectance with respect to light at a wavelength of 600 nm is equal to or more than 93% and equal to or less than 99%.

Abstract: An ?-sialon phosphor particle containing Eu. At least one minute recess is formed on a surface of the ?-sialon phosphor particle. The ?-sialon phosphor particle is preferably produced by undergoing a raw material mixing step, a heating step, a pulverizing step, and an acid treatment step.

Abstract: An ?-sialon phosphor particle containing Eu. At least one slit is formed on a surface of the ?-sialon phosphor particle. The ?-sialon phosphor particle is preferably produced by undergoing a raw material mixing step, a heating step, a pulverizing step, and an acid treatment step.

Abstract: A phosphor having a main crystal phase having a crystal structure identical to that of CaAlSiN3, and including a Ca element partially replaced with an Eu element, wherein the phosphor has a median size d50 of 12.0 ?m or more and 22.0 ?m or less, as measured according to a laser diffraction scattering method, and has a specific surface area of 1.50 m2/g or more and 10.00 m2/g or less, as measured according to a BET method.

Abstract: A red phosphor represented by general formula: MSiAlN3, wherein M is at least one or more elements selected from Mg, Ca, Sr and Ba, and is partially replaced with Eu and has, as a host crystal, a crystal structure identical to that of a CaAlSiN3 crystal phase, and the phosphor has a bulk density of 0.70 g/cm3 or more and 2.30 g/cm3 or less. There is also provided a light-emitting element including the red phosphor and a semiconductor light-emitting element capable of exciting the red phosphor.

Abstract: The purpose of the invention is to both improve the luminance of a SCASN-based phosphor and achieve deep-color rendering properties. Provided is a red phosphor having a main crystal phase having the same crystal structure as a crystal structure of CaAlSiN3, the main crystal phase represented by the general formula MAlSiN3, wherein an internal quantum efficiency, as measured when the red phosphor is excited by light having a wavelength of 455 nm, is 71% or more, and M in the general formula represents an element group containing at least three elements selected from Eu, Sr, Mg, Ca, and Ba, the element group containing Eu, Sr, and Ca as essentials, and a Eu content is 4.5 mass % or more and 7.0 mass % or less, a Sr content is 34.0 mass % or more and 42.0 mass % or less, and a Ca content is 0.8 mass % or more and 3.0 mass % or less.