CeO_2对Tb^(3+)掺杂硅酸盐玻璃发光和耐辐照性能的影响

Effect of CeO_2 on luminescence and irradiation resistance of Tb^(3+) doped silicate glasses

采用高温熔制工艺制备出Tb3+掺杂硅酸盐玻璃,研究了CeO2对Tb3+掺杂硅酸盐玻璃发光和耐辐照性能的影响。结果表明,Ce3+的激发带与Tb3+的激发带部分重叠,使激发Tb3+离子发光的能量减少,Tb3+离子在550nm的发光被淬灭;激发停止后,Ce3+/Ce4+减少了由陷阱中逃逸出的空穴和电子的直接复合而传递给Tb3+的激发能量,Tb3+发光余辉缩短。通过铈离子价态变化:Ce4++eCe3+,CeO2引入可以减少辐照对基础玻璃和Tb3+的损伤。综合考虑发光和辐照稳定性,Tb3+掺杂硅酸盐玻璃中CeO2的引入量应控制在0.4%～0.8%(质量分数)。

Tb3＋doped silicate glasses were successfully fabricated by high temperature melting process,and the effect of CeO2on their luminescent properties and irradiation resistances was investigated.Results showed that excited energy of Tb3＋ decreases due to part of absorption bands of Tb3＋ overlap with those of Ce3＋,which leads to quenching the luminescence of Tb3＋at 550nm.The afterglow life shortens for Tb3＋doped silicate glasses with the increase of CeO2concentration.Irradiation resistance of Tb3＋doped silicate glasses can be effectively improved by CeO2introduction because the valence change reaction takes place during irradiation：Ce4＋ ＋e Ce3＋.Taking the effect on luminescent properties and irradiation stability into account synthetically,the suitable CeO2concentration for Tb3＋doped silicate glasses should be 0.4%-0.8wt%.