%0 Journal Article
%T Mechanisms and Concentration Dependence of Upconversion Fluorescence in Er3+ and Tm3+ Codoped Tellurite Glasses<br>Mechanisms and Concentration Dependence of Upconversion Fluorescence in Er^3＋ and Tm^3＋ Codoped Tellurite Glasses
%A SHEN Xiang
%A NIE Qiu-Hua
%A XU Tie-Feng
%A PENG Tao
%A GAO Yuan
%A <br>沈祥
%A 聂秋华
%A 徐铁峰
%A 彭涛
%A 高媛
%J 中国物理快报
%D 2004
%I 
%X We investigate the upconversion luminescence of Er3^ and Tm^3 codoped tellurite glasses under both the 975 and 80Ohm excitations. By Tm^3 codoping, the Er^3 green emission corresponding to the (^4S3/2, 2H11/2) → 4I15/2 transitions was quenched, while the red emission corresponding to the ^4F9/2 → ^4I15/2 transition was selectively sensitized. The red emission has a maximum in the range where the ratio of Er^3 - to Tm^3 -content is about two and its fluorescence intensity becomes 1.5 and 5 times larger at the maximum than those in the absence of Tm^3 for 975 and 800 nm excitations, respectively. The results were explained considering the influence of energy transfers between these two active ions.
%K 74
%K 25
%K Gz
%K 42
%K 70
%K Hj
%K 73
%K 61
%K Jc
%K 76
%K 30
%K Kg<br>浓度依赖
%K 荧光转换
%K 亚碲酸盐玻璃
%K 光学衰减
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=E27DA92E19FE279A273627875A70D74D&aid=03E44B02E3C63961A0FD5374D0A20C2F&yid=D0E58B75BFD8E51C&vid=659D3B06EBF534A7&iid=59906B3B2830C2C5&sid=87A4D5C6B6E026A9&eid=9C5C90CDD348E92B&journal_id=0256-307X&journal_name=中国物理快报&referenced_num=0&reference_num=12