摘要
用水热法合成了YLiF4:Er3+,Yb3+,Er3+的浓度固定为2 mol％,Yb3+浓度变化范围是0-7 mol％。在这个浓度范围内,980 nm附近的吸收随着Yb3+浓度的增大而增强。用980 nm激发得到的上转换 发光强度随Yb3+浓度的增大而增强。在Yb3+浓度低于6 mol％时,上转换发光强度随Yb3+浓度的增大变化 的比较缓慢,当Yb3+浓度超过6 mol％时,上转换发光突然增强。以Yb3+浓度是2 mol％的样品为代表,研 究了Er3+对应红光、绿光发射的激发光谱,并测试了不同波长激发下的红光发射和绿光发射,证明红光发 射是来源于4F9／2→2I15/2,绿光是来自4S3／2→2I15／2和2H11/2→2I15／2。它们的上转换过程都是双光子过程。
YLiF4 ：Er^3＋ , Yb^3＋ was synthesized by hydrothermal method. The concentration of Er^3＋ was 2 mol%, and Yb^3＋ changed from 0 to 7 mol%. At room temperature the absorbance of YLiF4 ：Er^3＋ , Yb^3＋ in all samples was measured from 200 to 1 200 nm. The absorbance around 980 nm increased with increasing Yb^3＋ concentration. The result shows that the upconversion intensity excited at 980 nm was enhanced. The enhanced intensity is dependent on the Yb^3＋ concentration. The excitation spectra and photoluminescence spectra were measured in the sample with Yb^3＋ concentration of 2 mol%. The red and green luminescence came from the transition ^4F9/2→^2I15/2, and ^4S3/2→^2I15/2 and ^2H11/2→^2I15/2, respectively.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2005年第12期1933-1937,共5页
Spectroscopy and Spectral Analysis
基金
国家重点基础研究发展计划(2003CB314707)北京交通大学人才基金(2005RC028)北京交通大学校基金资助
