OH^-对掺Er^(3+)碲酸盐玻璃上转换发光的影响

Influence of OH^- on Upconversion Luminescence of Er^(3+)-Doped Tellurite Glasses

研究了碲酸盐玻璃的拉曼光谱和红外光谱,分析了OH-对掺Er3+碲酸盐玻璃上转换发光的影响机制。实验结果表明,氧氟碲酸盐玻璃(TPF)的声子能量高于氧氯碲酸盐玻璃(TPC)的声子能量,但是Er3+掺杂TPF玻璃上转换发光强度也高于Er3+掺杂TPC玻璃。除水实验发现这种现象可归因于OH-的影响。随OH-浓度降低,Er3+的荧光寿命和上转换荧光都增加。在实验中,OH-对Er3+上转换发光的影响大于声子能量对Er3+上转换发光的影响,导致Er3+掺杂TPF玻璃上转换发光强度高于Er3+掺杂TPC玻璃的上转换发光。研究结果有助于进一步提高Er3+的发光效率。

The Raman and infrared spectra of tellurite glasses were studied, and the influence mechanism of OH^- on upconversion luminescence of Er^3＋-doped tellurite glasses was analyzed. The experimental results showed that the phonon energy of oxyfluoride tellurite （60TeO2-40PbF2-0.5Er2O3 , TPF） glass was higher than that of oxychloride tellurite （60TeO2-40PbCl2-0. 5Er2O3, TPC） glass, but upconversion luminescence intensity of Er^3＋-doped TPF glass was also higher than that of Er^3＋ doped TPC glass. It is considered in the removing water experiment that this phenomenon could be mainly attributed to the effect of OH^-. With decreasing concentration of OH^- , both the fluorescence lifetime and upconversion luminescence of Er^3＋ were enhanced. In this experiment, the effect of OH^- on upconversion luminescence of Er^3＋ was bigger than that of phonon energy, and thus resulted in upconversion luminescence intensity of Er^3＋-doped TPF glass higher than that of Er^3＋-doped TPC glass. The research results were conducing to increase luminescence efficiency of Er^3＋.