Luminescence, energy transfer properties of Tb3+/Gd3+-coactivated oxyfluoride borogermanate scintillating glasses

作者：Sun, Xin-Yuan^*; Yang, Qing-Mei; Gao, Pan; Wu, Hong-Shu; Xie, Peng

来源：Journal of Luminescence, 2015, 165: 40-45.

DOI：10.1016/j.jlumin.2015.04.021

• Tb3+-activated oxyfluoride borogermanate scintillating glass
• Energy transfer
• X-ray excited luminescence

Gd3+-, Tb3+/Gd3+-coactivated oxyfluoride borogermanate scintillating glasses with the density of about 635-6.61 g/cm(3) were prepared by a melt-quenching method. The luminescent and energy transfer properties were studied by transmittance, photoluminescence and X-ray excited luminescence (XEL) spectra. The total content of rare-earth oxide and fluoride is as high as 49 mol% in oxyfluoride borogermanate glasses, which are necessary to ensure their density up to 6.61 g/cm(3). Energy transfer efficiency and mechanism from Gd3+ to Tb3+ were determined, and the corresponding critical distances for both Gd3+-Tb3+ and Tb3+-Tb3+ ion pairs were calculated, respectively. The optimal concentration of Tb3+ ions in dense oxyfluoride borogermanate glasses excited by both ultraviolet light and X-ray excitation were also determined. The integral scintillation efficiency of Tb3+-activated borogermanate scintillating glass was found to be about 26.9% of the standard Bi4Ge3O12 (BGO) scintillating crystal.

• 出版日期2015-9
• 单位中国科学院上海硅酸盐研究所; 井冈山大学