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
-
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。
-
关键词:
- Li+离子 /
- Tb3+掺杂硅酸盐玻璃 /
- 非桥氧 /
- 闪烁性能
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 increas-
Key words:
- li+ ions /
- tb3+-doped silicate glasses /
- nonbridge oxygen /
- luminescent properties
-
点击查看大图
计量
- 文章访问数: 1781
- HTML全文浏览量: 169
- PDF下载量: 329
- 被引次数: 0
下载:
