Investigation of energy absorption and transfer process of Tb 3+ or Eu 3+ excited Na 3Gd(PO 4) 2 in the VUV region

Abstract

Na 3Gd(PO 4) 2, Na 3Gd 0.94(PO 4) 2:0.06Tb 3+ and Na 3Gd 0.94(PO 4) 2:0.06Eu 3+ are prepared by solid-state reaction and their photoluminescence (PL) properties are investigated in the ultraviolet (UV) and vacuum ultraviolet (VUV) region. The obtained results show that Na 3Gd 0.94(PO 4) 2:0.06Tb 3+ has an efficient emission under 147 nm excitation, but the emission efficiency of Na 3Gd 0.94(PO 4) 2:0.06Eu 3+ is low under 147 nm excitation. We discuss the energy absorption and transfer process in the VUV region to solve the special phenomenon.