| abstract |
Provided is a nitride phosphor comprising a (Ca,Sr)AlSiN 3 :Eu phosphor, of which the chemical composition can be controlled easily and which has excellent fluorescent properties. Provided is a method for producing a nitride phosphor represented by the formula: (Ca 1-x1-x2 Sr x1 Eu x2 ) a Al b Si c N 2a/3+b+4/3c (wherein 0.49<x1<1.0, 0.0<x2<0.02, 0.9¤a¤1.1, 0.9¤b¤1.1, 0.9¤c¤ 1.1). In the method, a silicon nitride powder is used as a raw material, wherein the silicon nitride powder has a specific surface area of 5 to 35 m 2 /g and also has such a property that the FS/FSO ((m 2 /g)/(mass%)) ratio is 8 to 53 and the FS/FIO ((m 2 /g)/(mass%)) ratio is 20 or more in which FSO (mass%) represents the ratio of the amount of oxygen existing in a region between the surface of each particle of the silicon nitride powder and a zone that is 3 nm directly below the surface of the particle to the amount of the silicon nitride powder by mass, FIO (mass%) represents the ratio of the amount of oxygen existing on the inner side of the zone that is 3 nm directly below the surface of the particle to the amount of the silicon nitride powder by mass, and FS (m 2 /g) represents a specific surface area. |