Method for preparing phosphor

摘要

A method for preparing a phosphor that comprises a crystalline oxide having M1O3 (M1 is a tetravalent metallic element) as a main framework thereof and essentially including a halogen element X (X is at least one element selected from a group consisting of F, Cl, Br, and I) and divalent metal ions M2 and Eu2+, includes using a compound represented by a compositional formula NH4X as a starting material when synthesizing the phosphor. At least a compound represented by a compositional formula NH4Cl may be used as the starting material.

主权项

1. A method for preparing a phosphor,
wherein the general formula of the phosphor is represented by (M2x,M3y,M4z)aM1O3Xb, where a is in a range of 0.8≦a ≦1.3, where b is in a range of 0.25≦b≦0.45, and where x, y, and z are in respective ranges that satisfy x+y+z=1, 0.18≦x≦0.59, 0.26≦y≦0.66, and 0.07≦z≦0.37, and wherein compounds represented by a compositional formulae (1) to (5), respectively, are used as starting materials: (1) M1O2 (2) M2O (3) M3O (4) NH4X (5) M4 or a compound including M4, where M1 represents at least one element selected from the group consisting of Si, Ge, Ti, Zr, and Sn, where M2 represents Ca and optionally includes at least one element selected from the group consisting of Mg, Ba, Zn, Cd, Ni, Cu, Hg, Co, and Sn, where M3 represents Sr and optionally includes at least one element selected from the group consisting of Ba, and Pb, where X represents at least one halogen element including at least Cl, where M4 represents Eu2+ and optionally includes at least one element selected from the group consisting of rare-earth elements and Mn, and wherein, when A=M2O/(M2O+M3O+M4), B=M4/(M2O+M3O+M4), C=NH4X/(M2O+M3O+M4), and D=M1O2/(M2O+M3O+M4), the compounds are blended such that ranges 0.19≦A≦0.59, 0.07≦B≦0.37, 0.29≦C≦1.11, and 0.05≦D≦4.35 are satisfied, and wherein the method comprises mixing and burning of the starting materials.