METHOD FOR PRODUCING SILICATE BLUE PHOSPHOR, SILICATE BLUE PHOSPHOR AND LIGHT-EMITTING DEVICE

摘要

Disclosed is a method for producing a silicate blue phosphor having high luminance and chromaticity y equal to or lower than that of BAM:Eu. Specifically disclosed is a method for producing a silicate blue phosphor represented by the following general formula: aAO bEuO (Mg<SUB>1-w</SUB>,Zn<SUB>w</SUB>)O cSiO<SUB>2</SUB> dCaCl<SUB>2</SUB> (wherein A represents at least one selected from Sr, Ba and Ca, 2.970 = a = 3.500, 0.006 = b = 0.030, 1.900 = c = 2.100, 0 = d = 0.05, and 0 = w = 1). This method for producing a silicate blue phosphor is characterized in that a heat treatment is performed in a gas atmosphere having an oxygen partial pressure of from 1 x 10<SUP>-15.5</SUP> atm to 1 x 10<SUP>-10</SUP> atm at 1200-1400°C.