METHOD FOR PRODUCING COATED PHOSPHOR, COATED PHOSPHOR, AND WHITE LIGHT SOURCE

摘要

PROBLEM TO BE SOLVED: To provide a coated phosphor which has good fluorescent characteristics and is capable of maintaining light-emitting characteristics over a long period of time.SOLUTION: A method for producing the coated phosphor includes a mixing step of mixing a phosphor and a metal alkoxide in a solvent to coat the phosphor with an aluminum oxide formed from an aluminum alkoxide. The phosphor contains group 2 elements (M), europium (Eu), silicon (Si), and oxygen (O) in an atomic ratio of compositional formula (1): [(M)Eu]SiOwhere a, b, c, and x satisfy relations of 1.8