White-light emission with a single activator in a single host is an attractive function of phosphors. In this work, we investigated the photoluminescence properties of Ba 5 (PO 4 ) 3-x (BO 3 ) x Cl, which is a compound derived from apatite type Ba 5 (PO 4 ) 3 Cl by means of diadochic substitution, with Eu 2+ -activation using photoluminescence measurements. Phosphors show a tunable emission from deep blue to white and then orange under near ultraviolet light excitation. In the compound Ba 5 (PO 4 ) 3 Cl, Ba 2+ ions occupy two crystallographical...
