Optical transitions and upconversion luminescence of Er3+/Yb3+-codoped halide modified tellurite glasses
Optical transitions and upconversion luminescence of Er3+/Yb3+-codoped halide modified tellurite glasses
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DOI：
10.1063/1.1645642
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发表时间：
2004-03
影响因子：
3.2
通讯作者：
Jianhui Yang;Liyan Zhang;L. Wen;S. Dai;Lili Hu;Zhong-hong Jiang
中科院分区：
文献类型：
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作者：
Jianhui Yang;Liyan Zhang;L. Wen;S. Dai;Lili Hu;Zhong-hong Jiang
采用常规熔融淬火方法合成了Er3+掺杂卤化物改性亚碲酸盐玻璃。对吸收光谱进行 Judd-Ofelt 分析，计算并讨论了跃迁概率、激发态寿命和支化比。获得了980 nm激发下的强红外和可见荧光光谱。在具有卤离子的玻璃中，在低至 30 mW 的泵浦功率下观察到强的上转换信号。讨论了上转换机制和功率相关强度，表明绿色和红色发射涉及双光子过程。确定并解释了发射态的衰减时间和相应的量子效率。
Er3+-doped halide modified tellurite glasses were synthesized by conventional melting and quenching method. The Judd–Ofelt analysis was performed on the absorption spectra and the transition probabilities, excited state lifetimes, and the branching ratios were calculated and discussed. The intense infrared and visible fluorescence spectra under 980 nm excitation were obtained. Strong upconversion signal was observed at pumping power as low as 30 mW in the glasses with halide ions. The upconversion mechanisms and power dependent intensities were discussed, which showed two-photon process are involved for the green and red emissions. The decay times of the emitting states and the corresponding quantum efficiency were determined and explained.