Enhancement mechanisms of luminescence and scintillation behaviors in Tb3+-doped silicoborate glass through Gd2O3 addition

초록

In this study, effect of Gd2O3 on luminescence and scintillation behaviors of Tb3+ doped in silicoborate glass scintillator were investigated. Glasses were synthesized by standard melt quenching technique in the formula of xGd2O3 - (10-x)SrO - 20La2O3 - 10Ta2O5 - 10SiO2 - 43B2O3 - 7Tb2O3, where x = 4.0, 6.0, and 8.0 mol%. The inclusion of Gd2O3 in the glass matrix results in a higher density and an increased effective atomic number, thereby enhancing the interaction of X-ray within the glass. Gd3+ ion also shows energy transfer to Tb3+ ion, which can be proofed by decay time and emission intensity analysis of Gd3+ emission. Photoluminescence (PL) result shows highest emission intensity at 6.0 % mol of Gd2O3 and, which corespond to fastest PL decay time of Gd3+ (ex = 275 nm, em = 311 nm), reflecting that highest energy transfer occurred at this concerentration. Scintillation light was observed through radioluminescence spectra investigation, with higher scintillation intensity associated with increased Gd2O3 concentration, reaching a maximum at 8.0 % mol of Gd2O3. The scintillation light is 30.84 % of BGO crystal. Scintillation decay profile was observed using pulse X-ray excitation and similar values in the range of millisecond with PL decay time were observed. The X-ray imaging was conducted using developed glass as a scintillator, which demonstrated superior spatial resolution (15.7 lp/mm) compared to the BGO crystal. This study indicates the potential of Gd3+ ions to enhance scintillation and X-ray imaging performance in glass scintillators.

키워드