中国激光, 2004, 31 (10): 1198, 网络出版: 2006-06-12   

Er3+掺杂重金属氧氟锗酸盐玻璃的光谱性质和上转换机理

Spectra Properties and Upconversion Mechanisms of Er3+-Doped Heavy Metal Oxyfluoride Germanate Glass
作者单位
中国科学院上海光学精密机械研究所, 上海 201800
摘要
研究了Er3+掺杂重金属氧氟锗酸盐玻璃的吸收光谱和上转换光谱性质,分析了玻璃中Er3+的上转换发光机理,应用Judd-Ofelt理论计算了Er3+在玻璃中的强度参数Ωt(t=2,4,6),自发辐射跃迁几率、荧光分支比和辐射寿命。结果表明,在975 nm抽运光激发下,观察到强烈的绿光和微弱的红光;绿光和红光发射是由于双光子吸收过程,其上转换机理是能量转换(ET)和激发态吸收(ESA)。拉曼光谱分析表明,对于上转换发光,玻璃结构中的F-离子起到重要作用。
Abstract
The absorption and upconversion spectra of Er3+-doped heavy metal oxyfluoride germanate glass were investigated, and upconversion mechanisms of Er3+ in the glass were analyzed. The Judd-Ofelt intensity parameters Ωt (t=2, 4, 6), spontaneous transition probability, fluorescence branching ratio and radiative lifetime τrad of each energy levels for Er3+ were calculated by Judd-Ofelt theory. The results showed that the intense green and weak red emissions were observed, a two-photon upconversion process was assigned to the green and red emissions, and the possible upconversion mechanisms were involved in excited state absorption and energy transfer between excited Er3+ ions. Raman spectrum indicated the fluoride ions in the glass network had important influence on upconvesion fluorescence.

徐时清, 汪国年, 杨中民, 戴世勋, 胡丽丽, 姜中宏. Er3+掺杂重金属氧氟锗酸盐玻璃的光谱性质和上转换机理[J]. 中国激光, 2004, 31(10): 1198. 徐时清, 汪国年, 杨中民, 戴世勋, 胡丽丽, 姜中宏. Spectra Properties and Upconversion Mechanisms of Er3+-Doped Heavy Metal Oxyfluoride Germanate Glass[J]. Chinese Journal of Lasers, 2004, 31(10): 1198.

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