Oxynitride phosphor powder, oxynitride production method of the phosphor powder for producing silicon nitride powder and the oxynitride phosphor powder

摘要

Composition _formula: Ca _x1 Eu _x2 Si 12- _{(y + z) Al (y + z) O z N 16-z} (In the formula, x1, x2, y, z are, 0 x1 ≦ 3.40, 0.05 ≦ x2 ≦ 0.20, 4.0 ≦ y ≦ 7.0, 0 ≦ z ≦ 1) by oxynitride phosphor powder comprising α-sialon and aluminum nitride represented by the composition represented. The oxynitride phosphor powder reflectance of light of the peak wavelength of the fluorescence emitted by being excited by light having a wavelength of 450nm is 80% or more. Crystalline nitride is silicon powder, oxynitride phosphor powder for producing a silicon nitride powder oxygen content of from 0.2 to 0.9% by weight. Raw materials are mixed in an inert gas atmosphere, by baking in the temperature range of 1500~2000 ℃, a first step of obtaining an oxynitride calcined product represented by the general formula, the oxynitride calcined product and in an inert gas atmosphere, 1100~1600 ℃ second step of the manufacturing method of the oxynitride phosphor powder having a heat treating at a temperature in the range of.