Abstract
Eu3+-activated dense B2O3-GeO2-BaF2-10LaF3-(37-x)Gd2O3-xEu2O3 (0≤x≤12.5) scintillating glasses were synthesized by melt-quenching method. Their optical properties were characterized by transmittance, excitation and emission spectra, and X-ray excited luminescence (XEL) spectra in detail. The total content of Gd2O3 and LaF3 rare-earth agents is as high as 47mol% in borogermanate glass, which ensures glass density exceed 6.0g/cm3. Energy transfer from Gd3+ to Eu3+ ions is verified by excitation and emission spectra. High efficiency of this transfer process is confirmed by both Gd3+ emission intensity and the average distances for Gd3+–Eu3+ ion pairs. The degree of Eu–O covalency and the local environment of Eu3+ ions are evaluated by the value of Ωt parameters from the Judd–Ofelt analysis. It is found that the covalency of EuO bond increases with increasing Eu3+ concentration. The optimal concentration of Eu3+-activated borogermanate scintillating glass under both ultraviolet and X-ray excitation is determined. It reveals that the integral scintillation efficiency is about 4% of the standard Bi4Ge3O12 (BGO) scintillating crystal.
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