测试了掺铒碲酸盐玻璃的荧光特性, 研究了4I13/2能级上Er3+离子的荧光谱、荧光强度和荧光寿命. 研究显示, 掺铒碲酸盐玻璃中存在着强烈的荧光俘获效应和浓度猝灭效应. 荧光俘获效应使得荧光谱中的各谱线成分相对强度随着Er3+离子掺杂浓度的增加发生改变, 从而导致荧光谱主峰的变迁和荧光谱的展宽. Er3+离子间的协作上转换引起的能量转移, 使得荧光强度在较高掺杂浓度下发生猝灭. 同时, 荧光俘获效应和浓度猝灭效应的相互作用, 导致荧光寿命随着Er3+离子掺杂浓度的增加呈现出先增大后减小的变化趋势.
Fluorescence properties of Er3+:4I13/2～4I15/2 transition were measured in a tellurite glass. The fluorescence spectra, fluorescence intensities and lifetimes were investigated as a function of erbium ion concentration. It is found that there are intense radiation trapping and concentration quenching effect in erbium-doped tellurite glasses. With the increase of erbium ion concentration, fluorescence spectrum broadens significantly and its main emission peak shifts from 1532nm to 1556nm as a result of the changed relative intensity of each spectral component caused by radiation trapping. Fluorescence intensity decreases strongly with higher erbium ion concentration due to concentration quenching effect caused by cooperative upconversion among Er3+ ions. Also, radiation trapping and concentration quenching cause fluorescence lifetime increase at first and then decrease rapidly with the increase of Er3+ concentration.
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