Solid state synthesis and tunable luminescence of LiSrPO4:Eu2+/Mn2+/Tb3+ phosphors

A series of Eu2+/Mn2+/Tb3+ doped LiSrPO4 phosphors have been synthesized by the solid state reaction. The XRD results show that all phosphors have the pure hexagonal crystal structure, indicating the doping ions have no influence on the phase of LiSrPO4 host. Under the excitation at 365 nm, LiSrPO4/Eu2+ phosphors emit blue emission originating from the 4f(6)5d(1) -> 4f(7) transitions of Eu2+. The Eu2+/Mn2+ or Tb3+ codoped LiSrPO4 phosphors show not only the emission of Eu2+ but also the red emission coming from the T-4(2) -> (6)A(1g) transitions of Mn2+ or green emissions induced by the D-5(4) -> F-7(j) transitions of Tb3+. The increasing Mn2+ or Tb3+ concentration induces the decrease of Eu2+ emission intensity, which suggests the energy from Eu2+ to Mn2+ or Tb3+ in LiSrPO4 host. For LiSrPO4:7 mol%Eu2+/5 mol%Mn2+/5 mol%Tb3+ phosphor, the white light can be obtained under the 365 nm excitation. (C) 2016 Elsevier Ltd. All rights reserved.