TeO_2-ZnO-Na_2O-K_2O玻璃中Er^(3+)离子掺杂浓度对其发光及荧光寿命的影响

Influence of concentration of Er^(3+) ions on luminescence and fluorescence lifetime in TeO_2-ZnO-Na_2O-K_2O glasses

测量了不同掺杂浓度下Er3+离子在碲酸盐玻璃中的吸收光谱、发射光谱和Er3+离子的荧光寿命,计算了Er3+离子的发射截面σe,分析了Er3+离子掺杂浓度对其发光强度和荧光寿命的影响.结果表明,Er3+离子掺杂浓度较低时,对其荧光强度和荧光寿命没有显著的影响;掺杂浓度高时,出现了浓度猝灭效应,使Er3+离子荧光光强度降低,荧光寿命下降.实验确定了掺杂浓度最优值,同时对浓度猝灭机制进行了分析.

Absorption spectra, emission spectra and fluorescence lifetime of Er3+ ions were measured for TeO2-ZnO-Na-2 O-K2O glasses with different doping concentrations of Er3+ and the emission cross section sigma(c) of Er3+ was calculated. Dependence of luminescence intensity and fluorescence lifetime on concentration of Er3+ were analyzed. The influence of concentration of Er3+ ions on luminescence intensity and fluorescence lifetime was unconspicuous in the case of low doping level of Er3+. However, high concentration of Er3+ ions resulted in the concentration quenching, which reduced the luminescence intensity and fluorescence lifetime. The optimum concentration of Er3+ ions was determined for TeO2-ZnO-Na2O-K2O glasses, and the mechanism of concentration quenching was also discussed and explained in detail.