Luminescence of Tb³⁺‐doped oxide glasses with high Gd₂O₃ concentration under UV and X‐ray excitation

Abstract

Abstract This report presents the luminescence properties of Tb 3+ ‐doped oxide glasses with high Gd 2 O 3 (25 mol%) concentration under UV and X‐ray excitation. The intense green 5 D 4 → 7 F J luminescence is observed with strong luminescence quenching of the 5 D 3 level due to cross‐relaxation process. Energy transfer from Gd 3+ to Tb 3+ ions is confirmed by both luminescence spectra and decay measurements. The integral scintillation efficiency obtained for the 0.5 wt% Tb 3+ ‐doped glass under X‐ray excitation is of about 40% of that of the reference Bi 4 Ge 3 O 12 crystal.