研究了掺铒氧氟碲酸盐玻璃的吸收光谱和上转换发光光谱,分析了Er3+离子在氧氟碲酸盐玻璃中的上转换发光机理.结果表明:通过975nm的激光二极管(LD)激发,在室温下同时观察到强烈的绿光(524和545nm)和红光(655nm),分别是由于Er3+离子2H11/2→4I15/2,4S3/2→4I15/2,和4F9/2→4I15/2跃迁.随PbF2含量增加,绿光的发光强度增加趋势较小,而红光的发光强度增加趋势大于绿光.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都是由于双光子吸收过程.
The absorption spectra and upconversion luminescence spectra of Er3+-doped oxyfluoride tellurite
glasses were investigated, and upconversion luminescence mechanisms of Er3+ in oxyfluoride tellurite glasses were analyzed. The results
show that the intense green (524 and 545nm) and red (655nm) emissions corresponding to the 2H9/2→4I15/2, 2H11/2→4I15/2,
4S3/2→4I15/2, and 4F9/2→4I15/2 transitions of Er3+ ions, respectively, can be simultaneously observed at room temperature under 975 nm diode laser excitation. With increasing PbF2 concentrations, the intensity for the green emissions increases
slightly, while the red emission intensity enhances much larger than the green emission intensities. 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 emission, respectively.
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