Photoluminescent properties and thermal stability of F-modified aluminosilicate phosphor for solid-state lighting

摘要

An ordering of the Sr cations over two crys-tallographic sites exists in F-modified aluminosilicate with composition of Sr_3Al_(0.5)Si_(0.5)O_(4.5)F_(0.5) (SASF), opening opportunity to customize the local crystal accommodation environment for activators upon solid solution of Ba~(2+) or Ca~(2+) for Sr~(2+) cations. A series of Sr_(2.975-z)M_zAl_(0.5)Si_(0.5) O_(0.5)F_(0.5):Ce~(3+) (M = Ba, Ca) phosphors are synthesized by high temperature solid-state reaction method, and the dependence of luminescent properties and thermal stability on the solid solution contents of alkaline-earth metals are investigated in this work. The preferable substitution sites of Ba~(2+) and Ca~(2+) and the resultant influence on the local crystal structure of Ce~(3+) and the performances of phosphors were discussed in detail.