| abstract |
The invention composition formula: Ca x1 Eu x2 Si 12 - (y + z) Al (y + z) O z N 16 -z ( However, the formula, x1, x2, y, z is 0 <x1≤3.40, 0.05≤ x2? 0.20, 4.0? y? 7.0, 0? z? 1), and an oxynitride phosphor powder containing? -sialon and aluminum nitride; The oxynitride phosphor powder having a reflectance of light of a peak wavelength of fluorescence emitted by excitation by light having a wavelength of 450 nm of 80% or more; A silicon nitride powder for producing an oxynitride phosphor powder having a crystalline silicon nitride powder and an oxygen content of 0.2 mass% to 0.9 mass%; And a raw material are mixed and fired in an inert gas atmosphere at a temperature in the range of 1500 ° C to 2000 ° C to obtain an oxynitride sintered body represented by the above general formula; And a second step of performing heat treatment in a temperature range of 1100 占 폚 to 1600 占 폚 in the atmosphere. |