Er3+/Yb3+共掺杂氧氟硅酸盐玻璃的上转换发光

研究了Er^3 ／Yb^3 共掺氧氟硅酸盐玻璃的吸收光谱、上转换光谱和拉曼光谱。分析了氧氟硅酸盐玻璃中Yb”敏化Er^3 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(408nm)、绿光(529nm和545nm)和红光(667nm)，分别是由于Er^3 离子。H9/2→^4I15/2,H11/2→^4I15/2,H3/2→^4I15/2和H9/2→^4I15/2跃迁。随Yb2O3浓度的增加。Yb^3 对Er^3 的能量转移增强，因此蓝光、绿光和红光的发光强度都增强，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Er^3 离子在氧氟硅酸盐玻璃中的上转换发光。玻璃结构中的PbF2起到重要作用。

The Upconversion Luminescence of Er3+/Yb3+ -Codoped Oxyfluorosilicate Glasses

The absorption spectrum, upconversion spectra and Raman spectrum of Er3+/Yb3+-codoped oxyfluorosilicate glasses have been investigated, and upconversion luminescence mechanisms of Yb3+ sensitize Er3+ in oxyfluorosilicate glasses were analyzed. The results showed that blue, green and red emission centered around 408 nm, 529 nm, 545 nm, and 667 nm, corresponding to the 2H9/2→4I15/2,2H11/2→4I15/2,4S3/2→4I15/2, and 4F9/2→4I15/2 transitions of Er3+, respectively, were simultaneously observed at room temperature under 975 nm diode laser excitation, and the intensity for blue, green and red emissions increases with the increasing Yb2O3 concentrations because energy transfer from Yb3+ to Er3+ was reinforced. A two-photon upconversion process is assigned to the intense green and red emission, 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 part in upconversion fluorescence of Er3+.