Process for producing phosphors

摘要

Infrared-infrared phosphors having a composition represented by the general formula AB1-x-yNdxYbyP4O12 wherein A is at least one element selected from the group consisting of Na, K, Rb and Cs, B is at least one element selected from the group consisting of Sc, Y, La, Ce, Gd, Lu, Ga, In, Bi and Sb, and x and y are numbers satisfying the conditions 0.05