Structure, site occupancies, and luminescence properties of Ca10M(PO4)7: Ce3+ (M = Li, Na, K) phosphors

Abstract

Abstract In this work, we reported a detailed studies on photoluminescence properties of Ce3+-doped Ca10M(PO4)7: Ce3+ (M\u202f=\u202fLi, Na, K) phosphors. VUV-UV-vis photoluminescence (PL) were employed to discuss the site occupancies of Ce3+ions in the host. Two kinds of Ce3+centers were observed in Ca10M(PO4)7 (M\u202f=\u202fLi, Na, K). The Ce(I)3+ emission at ∼355\u202fnm is contributed to Ce3+ ions in Ca(1), Ca(2) or Ca(3) sites, while the Ce(II)3+ emission at ∼430\u202fnm are assigned to Ce3+ entering Ca(5) site. The effects of temperature on Ce3+ luminescence properties show Ce(2)3+ emissions have a faster thermal quenching in Ca10M(PO4)7.