Luminescent Properties of NaGdF4and GdB3O6Co-doped with Pr3+and Tb3+under VUV Excitation

NaGdF4 and GdB3O6 doped with Pr3+ and/or Tb3+ were prepared and their VUV excited fluorescence properties were studied.Gd3+ plays an important role in the energy transfer process from Pr3+ to Tb3+ upon the excitation of VUV photons.No obvious energy transfer from Pr3+ to Tb3+ was observed in the absence of Gd3+;on the contrary,Pr3+ transfer most of the energy to Gd3+ after Gd3+ was added,then the energy was transferred from Gd3+ to Tb3+.So the conversion from the near ultraviolet emission of Pr3+ to the green emission of Tb3+ was realized.