Investigation on the luminescent properties of Eu3 +-activated dense oxyfluoride borogermanate scintillating glasses
Investigation on the luminescent properties of Eu3 +-activated dense oxyfluoride borogermanate scintillating glasses
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DOI：
10.1016/j.jnoncrysol.2014.08.020
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发表时间：
2014-11
影响因子：
3.5
通讯作者：
Xinyuan Sun;Xiang Zhang;Haohong Chen;Q. Hu;Wen-feng Wang;Zhi-Jun Zhang;Jingtai Zhao
中科院分区：
文献类型：
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作者：
Xinyuan Sun;Xiang Zhang;Haohong Chen;Q. Hu;Wen-feng Wang;Zhi-Jun Zhang;Jingtai Zhao
采用熔体淬冷法合成了Eu3+激活的致密B2O3GeO2-BaF2-10LaF3-(37-x)Gd2O3xEu2O3O(≤x≤(12.5))闪烁玻璃。通过透过率、激发光谱、发射光谱和X射线激发发光光谱对其光学性质进行了详细的表征。玻璃中Gd2O3LaF3稀土元素的总含量高达47%，保证了玻璃密度大于6.0微克/厘米~3。激发光谱和发射光谱证实了Gd3+离子向Eu3+离子的能量转移。Gd3+发射强度和Gd3+-Eu3+离子对的平均距离都证实了这种转移过程的高效率。Eu~(3+)-O共价度和Eu~(3+)离子的局域环境由Ω-O分析得到的参数值来评价。结果表明，随着Eu3+浓度的增加，Eusingle Bondo键的共价性增加。确定了Eu3+激活的硼锗酸盐闪烁玻璃在紫外光和X射线激发下的最佳浓度。结果表明，积分闪烁效率约为标准Bi4Ge3O12(BGO)闪烁晶体的4%。
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 Gd2O3and LaF3rare-earth agents is as high as 47 mol% in borogermanate glass, which ensures glass density exceed 6.0 g/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 ofΩtparameters from the Judd–Ofelt analysis. It is found that the covalency of Eusingle bondO 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.