强激光与粒子束, 2010, 22 (11): 2719, 网络出版: 2010-12-07   

Li+对Tb3+掺杂硅酸盐玻璃闪烁性能的影响

Effects of Li+ ions on luminescent properties of Tb3+doped silicate glasses
作者单位
同济大学 波耳固体物理研究所, 上海市特殊人工微结构材料与技术重点实验室, 上海 200092
摘要
利用高温熔融法制备了Li+掺杂Tb3+激活硅酸盐闪烁玻璃。通过Li+掺杂Tb3+激活硅酸盐玻璃的紫外可见透射光谱、发射光谱和发光衰减时间谱, 研究了Li+的加入对Tb3+掺杂硅酸盐玻璃发光性能的影响。结果表明: 适量Li+的加入可有效增强Tb3+激活硅酸盐玻璃的发光强度, 且相比于不掺杂Li+的Tb3+掺杂硅酸盐玻璃而言, 当掺入质量分数为2.0%的Li+时, Tb3+在玻璃中的最佳掺杂质量分数由12.8%提高至15.3%。其原因是Li+掺杂增加了玻璃体系中非桥氧的数量, 从而有利于改善Tb3+在玻璃体中的均匀性, 降低Tb3+间因非辐射跃迁而引起的能量损失, 以及提高Tb3+的最佳掺杂质量分数。但当掺入Li+的质量分数超过2.0%时, 会对Tb3+激活硅酸盐玻璃的闪烁光强产生负面影响, 这是因为过多的非桥氧阻碍了X射线激发能达到Tb3+离子的能量传递。
Abstract
The Tb3+-doped silicate glasses with and without Li+ ions were synthesized by high-temperature melting method. The effects of Li+ ions on the luminescent properties of Tb3+-doped silicate glasses were studied with ultraviolet-visible transmission, emission and decay time spectra. The results show that the Li+ ion co-dopant can increase the emission intensity of Tb3+-doped silicate glasses. Additionally, the optimal Tb3+ dopant concentration can be raised from 12.8% to 15.3% in the silicate glasses with 2.0% Li+ ion co-dopant compared to those without Li+ ions. The reason is tentatively ascribed to nonbridge oxygen. The nonbridge oxygen is propitious to uniform distribution of Tb3+ ions, thereby its increase reduces the energy loss due to nonradiative transition within Tb3+ ions and increases the optimal Tb3+ dopant concentration. However, the emission intensities of Tb3+ ions will decrease under X-ray excitation when the concentration of Li+ ions is beyond 2.0% since the Li+ ion probably result in too much nonbridge oxygen, which is considered as the defect to restrain the energy transfer to Tb3+ ions.

金鑫杰, 顾牡, 黄世明, 倪晨, 刘小林, 刘波. Li+对Tb3+掺杂硅酸盐玻璃闪烁性能的影响[J]. 强激光与粒子束, 2010, 22(11): 2719. Jin Xinjie, Gu Mu, Huang Shiming, Ni Chen, Liu Xiaolin, Liu Bo. Effects of Li+ ions on luminescent properties of Tb3+doped silicate glasses[J]. High Power Laser and Particle Beams, 2010, 22(11): 2719.

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