| abstract |
Composition formula: Ca x1 Eu x2 Si 12- (y + z) Al (y + z) O z N 16-z (Where x1, x2, y, and z are 0 <x1 ≦ 3.40, 0.05 ≦ x2 ≦ 0.20, 4.0 ≦ y ≦ 7.0, 0 ≦ z ≦ 1) An oxynitride phosphor powder containing α-sialon and aluminum nitride represented by the composition represented. The oxynitride phosphor powder having a reflectance of 80% or more of light having a peak wavelength of fluorescence emitted when excited by light having a wavelength of 450 nm. A silicon nitride powder for producing an oxynitride phosphor powder, which is a crystalline silicon nitride powder and has an oxygen content of 0.2 to 0.9% by mass. A first step of mixing raw materials and firing in an inert gas atmosphere at a temperature range of 1500 to 2000 ° C. to obtain a fired oxynitride represented by the above general formula, and the fired oxynitride And a second step of heat-treating in an inert gas atmosphere in a temperature range of 1100 to 1600 ° C. |