Abstract
Tb3+-activated 25B2O3–40GeO2–(35−x)Gd2O3–xTb2O3 scintillating glasses were prepared by melt-quenching method. Their structure and luminescent properties were characterized by transmittance, Raman, photoluminescence and X-ray excited luminescence (XEL) spectra in details. A high Gd2O3 content is necessary to ensure borogermanate glass with density up to 5.7g/cm3. Energy transfer efficiency from Gd3+ to Tb3+ ions, and critical distances for both Gd3+-Tb3+ and Tb3+-Tb3+ ion pairs were calculated, respectively. The optimal concentration of Tb3+-activated borogermanate scintillating glass under both ultraviolet and X-ray excitation is determined. It reveals that the integral scintillation efficiency is about 30% of the standard Bi4Ge3O12 (BGO) scintillating crystal.
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