摘要
研究了Er3 + /Yb3 + 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Yb3 + 敏化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 0 8nm)、绿光 (5 2 9nm和 5 4 5nm )和红光 (6 6 7nm ) ,分别是由于Er3 + 离子 2 H9/ 2 → 4I15/ 2 ,2 H11/ 2 → 4I15/ 2 ,4S3 / 2 →4I15/ 2 ,和4F9/ 2 →4I15/ 2 跃迁。随Yb2 O3 浓度的增加 ,Yb3 + 对Er3 + 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Er3 + 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 absorption spectrum, upconversion spectra an d Raman spectrum of Er 3+ /Yb 3+ -codoped oxyfluorosilicate glasses hav e been investigated, and upconversion luminescence mechanisms of Yb 3+ sens itize Er 3+ in oxyfluorosilicate glasses were analyzed. The results showed that blue, green and red emission centered around 408 nm, 529 nm, 545 nm, and 66 7 nm, corresponding to the 2H 9/2 → 4I 15/2 , 2H 1 1/2 → 4I 15/2 , 4S 3/2 → 4I 15/2 , and 4 F 9/2 → 4I 15/2 transitions of Er 3+ , respectively, were s imultaneously observed at room temperature under 975 nm diode laser excitation, and the intensity for blue, green and red emissions increases with the increasin g Yb 2O 3 concentrations because energy transfer from Yb 3+ to Er 3+ was reinforced. A two-photon upconversion process is assigned to the in tense green and red emission, respectively, while a three-photon process is res ponsible for weak blue upconversion. Raman spectrum indicates that the lead fluo ride in the glass network play an important part in upconversion fluorescence of Er 3+ .
出处
《光学学报》
EI
CAS
CSCD
北大核心
2004年第8期1103-1106,共4页
Acta Optica Sinica
基金
国家自然科学基金 (6 0 2 0 70 0 6和 6 0 30 70 0 4 )
上海市科委光科技 (0 2 2 2 6 10 4 6 )资助课题
