Patent ID: 8551793

Claim:
A method of preparing a fluorosulfide phosphor, comprising: weighting stoichiometric amounts of the required raw materials, wherein the raw materials comprises at least a metal sulfide and at least a metal fluoride, the metal of which is a rare earth metal, a group 13 metal or a combination thereof; uniformly mixing the weighted stoichiometric amounts of the raw materials; calcining the mixed raw materials under a vacuum environment of 10 −2 torr at a temperature of 900-1200° C. until a pure crystal phase of phosphor is obtained; and cooling to room temperature to obtain the fluorosulfide phosphor, where a chemical formula of the fluorosulfide phosphor is (A 1-x-y Ce x B y )SF, A and B are trivalent metal ions other than Ce, 0<x≦0.1 and 0≦y≦1.