Glasses were prepared from the compositions of 25Gd2O3-10CaO-10SiO2-(55–x)B2O3-xDy2O3 (wherex is 0.0 mol.%–1.0 mol.%) by the conventional melt-quenching technique at 1400 oC. The results demonstrated the increase in the glass density with re-spect to the increase in the doping concentrations of Dy2O3. Nine absorption bands were observed. The emission spectra of the de-veloped glass showed two strong peaks at 577 nm (4F9/2→6H13/2) and 482 nm (4F9/2→6H15/2). The highest emission intensity was ob-served from the developed glass prepared at 0.4 mol.% of Dy2O3, as the efficient energy transfer took place from Gd3+ to Dy3+. From the X-ray induced optical luminescence, the emission spectra were identical to those from PL measurements, but with the highest in-tensity observed from the glass quenched at 0.45 mol.% of Dy2O3. Finally, the integral scintillation efficiency of the developed glass was determined at 27% of that of the commercially available BGO crystal.
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