Er^(3+)掺杂重金属氧氟硅酸盐玻璃的上转换发光研究

The upconversion luminescence research of Er^(3+)-doped heavy metal oxyfluorosilicate glasses

研究了Er3+ 掺杂重金属氧氟硅酸盐玻璃的吸收光谱、上转换光谱和拉曼光谱 ,分析了重金属氧氟硅酸盐玻璃中Er3+ 的上转换发光机理 .结果表明 :通过 975nm的激光二极管激发 ,在室温下同时观察到蓝光 (4 1 1nmj)、绿光(5 2 5和 5 4 3nm)和红光 (6 5 5nm) ,分别是由于Er3+ 离子2 H9 2 →4 I1 5 2 ,2 H1 1 2 →4 I1 5 2 ,4 S3 2 →4 I1 5 2 ,和4 F9 2 →4 I1 5 2 跃迁 .随Er2 O3浓度的增加 ,蓝光、绿光和红光的发光强度都增强 ,上转换发光机理主要涉及能量转移和激发态吸收 ,强烈的绿光和红光激发是由于双光子吸收过程 ,而微弱的蓝光是由于三光子吸收过程 .拉曼光谱发现 ,对Er3+ 离子在重金属氧氟硅酸盐玻璃中的上转换发光 ,玻璃结构中的PbF2

The absorption spectrum, upconversion spectra and Raman spectrum of Er 3+ _doped heavy metal oxyfluorosilicate glasses have been investigated, and luminescence mechanisms of Er 3+ in heavy metal oxyfluorosilicate glasses were analyzed. The results showed that blue, green and red emission centered around 411, 525, 543, and 655 nm, corresponding to the 2 H 9/2 → 4 I 15/2 , 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 , and 4 F 9/2 → 4 I 15/2 transitions of Er 3+ ions, respectively, were simultaneously observed at room temperature under 975 nm diode laser excitation, and the intensity for blue, green and red emissions increases with increasing Er 2 O 3 concentrations. There are two basic upconversion mechanisms: excited state absorption and energy transfer, and a two_photon upconversion process is assigned to the intense green and red emissions, respectively, while a three_photon process is responsible for weak blue upconversion. Raman spectrum indicates that the lead fluoride in the glass network play an important role in upconvesion fluorescence of Er 3+ .