“…Apatite type alkaline-earth halophosphates belongs to the hexagonal symmetrical system (space group of P 6 3 / m ) with a general formula of M 5 (PO 4 ) 3 X (M = Na + , K + , Ca 2+ , Mg 2+ , Ba 2+ , Sr 2+ , Mn 2+ , Gd 3+ , Lu 3+ , Y 3+ , X = F, Cl, OH and O). So far, a variety of phosphates with the formula M 3 NaRE(PO 4 ) 3 F have been reported in the literature, such as Sr 3 NaGd(PO 4 ) 3 F, Ba 3 NaLa(PO 4 ) 3 F, and Sr 3 NaLa(PO 4 ) 3 F. 14–16 To the best of our knowledge, there are no reports about the detailed CR property among the Tb 3+ ions in Sr 3 YNa(PO 4 ) 3 F host.…”