Patent ID: 8883041

Claim:
A method for preparing a phosphor, wherein the general formula of the phosphor is represented by (M 2 x ,M 3 y ,M 4 z ) a M 1 O 3 X b , 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) M 1 O 2 (2) M 2 O (3) M 3 O (4) NH 4 X (5) M 4 or a compound including M 4 , where M 1 represents at least one element selected from the group consisting of Si, Ge, Ti, Zr, and Sn, where M 2 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 M 3 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 M 4 represents Eu 2+ and optionally includes at least one element selected from the group consisting of rare-earth elements and Mn, and wherein, when A=M 2 O/(M 2 O+M 3 O+M 4 ), B=M 4 /(M 2 O+M 3 O+M 4 ), C=NH 4 X/(M 2 O+M 3 O+M 4 ), and D=M 1 O 2 /(M 2 O+M 3 O+M 4 ), 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.