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Keywords:

  • energy tranfer;
  • luminescence;
  • luminescence decays;
  • scintillation;
  • Tb3+

Abstract

This report presents the luminescence properties of Tb3+-doped oxide glasses with high Gd2O3 (25 mol%) concentration under UV and X-ray excitation. The intense green 5D4[RIGHTWARDS ARROW]7FJ luminescence is observed with strong luminescence quenching of the 5D3 level due to cross-relaxation process. Energy transfer from Gd3+ to Tb3+ ions is confirmed by both luminescence spectra and decay measurements. The integral scintillation efficiency obtained for the 0.5 wt% Tb3+-doped glass under X-ray excitation is of about 40% of that of the reference Bi4Ge3O12 crystal.