Er^(3+)单掺,Er^(3+)/Yb^(3+)共掺杂氟化物中红绿上转换荧光机理实验探索  

The Upconversion Mechanisms for the Red and Green Emissions in Er^(3+) Doped and Er~ (3+)-Yb~ (3+) Codopoed Fluoride Materials Based on Experiment

作　　者：雷军辉[1] 肖思国[1] 闫磊[1] 刘政威[1] 

机构地区：[1]湘潭大学物理学院,湖南湘潭411105

出　　处：《光谱学与光谱分析》2005年第9期1382-1384,共3页Spectroscopy and Spectral Analysis

基　　金：国家"863"项目(2002AA324030);湖南省教育厅优秀青年教师基金(03B039);湖南省教育厅一般项目基金(04C663);湖南省自然科学基金(04JJ3041)资助

摘　　要：制备了稀土离子Er3+单掺,Er3+-Yb3+共掺杂氟化物样品。在980nm波长激光激发下,室温时观察到了清晰可见的红(650nm)绿(545nm)上转换荧光,它们分别对应4S3/2,2H11/2—4I15/2和4F9/2-4I15/2的发射。同时发现红绿上转换荧光的比值随Er3+的浓度增加而减少(对共掺而言)。上换荧光强度与激发光强度的关系表明红绿上转换荧光都是双光子上转换过程,在此基础上,根据能量匹配的原理,讨论了红绿上转换荧光的可能实现机制。The rare earth Er^3＋ doped and Er^3＋ -Yb^3＋ co-doped fluoride samples were prepared. Under 980 nm laser excitation, the intense red （650 nm） and green （545 nm） upconversion luminescence was obtained corresponding to the transitions ^4S3/2,^2H11/2-^4I15/2 and ^4F9/2-^4I15/2 , respectively. For the Er^3＋ -Yb^3＋ co-doped fluoride samples, it was found that the ratio of the red upconversion luminescence to the green one decreases as the Er^3＋ concentration increases. The dependence of upconversion intensities on excitation power indicates that two-photon absorption processes are responsible for the upconverted luminescence. The possible upconversion mechanisms of the red and green emissions are discussed based on the energy-matching conditions and the quadratic dependence on excitation power.

关 键 词：稀土 上转换 能量匹配 

分 类 号：O782[理学—晶体学]