Investigation of energy absorption and transfer process of Tb3+ or Eu3+ excited Na3Gd(PO4)2 in the VUV region

Na3Gd(PO4)2, Na3Gd0.94(PO4)2:0.06Tb3+ and Na3Gd0.94(PO4)2:0.06Eu3+ 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 Na3Gd0.94(PO4)2:0.06Tb3+ has an efficient emission under 147 nm excitation, but the emission efficiency of Na3Gd0.94(PO4)2:0.06Eu3+ is low under 147 nm excitation. We discuss the energy absorption and transfer process in the VUV region to solve the special phenomenon.

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► Na3Gd(PO4)2:Eu3+ has a low emission comprising with Na3Gd(PO4)2:Tb3+ under 147 nm excitation.
► Excitation efficiency of the host matrix of Eu3+ excited Na3Gd(PO4)2 is lower than that of Tb3+.
► Energy transfer efficiency of Eu3+ excited Na3Gd0.94(PO4)2:0.06Eu3+ is lower than that of Tb3+.