伽马辐照对掺镱硅酸盐玻璃光学性能的影响

采用传统的高温熔融法熔制了一系列掺镱硅酸盐玻璃, 并测试了这些样品经总剂量为5 kGy的钴-60伽马射线辐射源辐照前后的吸收谱、荧光谱和上转换发光光谱. 实验结果表明: 辐致暗化效应导致玻璃样品在400 nm附近出现一个非常强的宽吸收带, 其尾端可延伸至近红外区.经辐致损耗谱分析可知, 部分Yb³⁺离子在辐照过程中通过俘获电离自由电子转变成了Yb²⁺离子, 导致掺杂样品的辐致损耗明显比基质材料的要大. 在960 nm LD泵浦下辐照过的样品荧光强度、上转换发光强度及荧光寿命均有所下降, 且在476 nm附近出现了氧缺陷ODC(Ⅱ)的荧光.室温下辐照过的样品在荧光测试过程中温度明显升高并出现漂白现象.     

Effect of yttrium oxide addition on absorption and emission properties of bismuth-doped silicate glasses

Y/Bi co-doped silicate glasses were prepared,and the effects of Y 2 O 3 on the absorption and emission properties were investigated by spectrum measurement.It was found that the absorption intensity in visible region decreases with increase of Y 3+ concentration in(70-x)SiO 2 xY 2 O 3-30CaO-1.5Bi 2 O 3(x=0 mol.%,1 mol.%,3 mol.%,5 mol.%,7 mol.%) glasses.The emissions centered at 410,630,1200 and 1290 nm were observed under 280,470,514 and 808 nm excitation,respectively.The emission intensity had the similar change tendency in the visible and near infrared region.We also discussed the actual role of Y 3+ ions playing in the visible and near infrared emissions of the silicate glasses.