Er3+掺杂重金属氧氟硅酸盐玻璃的上转换发光研究

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(411nmj)、绿光(525和543nm)和红光(655nm)，分别是由于Er3+离子2H9/2→4I15/2, 2H11/2→4I15/2, 4S3/2→4I15/2, 和4F9/2→4I15/2跃迁. 随Er2O3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 关键词： Er3+离子 重金属氧氟硅酸盐玻璃 上转换光谱 发光机理

The upconversion luminescence research of Er3+-doped heavy metal oxyfluorosilicate glasses

The absorption spectrum, upconversion spectra and Raman spectrum of Er3+-doped heavy metal oxyfluorosilicate glasses have been investigated, and luminescence mechanisms of Er3+ 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 2H9/2→4I15/2,2H11/2→4I15/2,4S3/2→4I15/2, and4F9/2→4I15/2transitions of Er3+ 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 Er2O3 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 Er3+.