掺Er^3＋重金属氧氟锗酸盐玻璃的上转换发光研究

Investigation on Upconversion Luminescence of Er^3＋ -doped Heavy Metal Oxyfluoride Germanate Glass

研究了Er^3＋掺杂重金属氧氟锗酸盐玻璃的吸收光谱、上转换光谱和拉曼光谱，分析了重金属氧氟锗酸盐玻璃中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强烈的绿光（529nm和551nm）和红光（657nm）发射，分别是由于Er^3＋离子^2H11／2→^415／2,^4S3／2→^4I15／2和^4F9／2→^4I15／2跃迁，并且均为双光子吸收过程。拉曼光谱研究表明氟离子在玻璃网络中具有重要作用。

The absorption spectrum, upconversion fluorescence spectrum and Raman spectra of Er^3＋ -doped heavy metal oxyfluoride gerrnanate glass are investigated. The results showed that intense green and red emission centered around 529 nm, 551 nm, and 657 nm, corresponding to the ^2H11/2→^4I15/2, ^4S3/2→^4I15/2, and ^4F9/2→^4I15/2 transitions of Er^3＋ , respectivdy, were simultaneously observed at room temperature under 975 nm diode laser excitation, a two-photon upconversion process is assigned to the green and red emission. Raman spectrum indicates the important role of fluoride ions in the formation of glass network.