Donor Concentration Dependence of Upconversion Luminescence in YLiF4:Er3+, Yb3+
ZHAO Su-ling1, XU Zheng1，2, PEI Xiao-jiang1
1. Institute of Optoelectronic Technology, Beijing Jiaotong University, the Lab of Materials for Information Storage and Displays, Beijing 100044, China 2. Tianjin University Postdoctoral Working Station, Economy and Technological Development Area Postdoctoral Working Station, Tianjin Zhong-Huan San-Jin Ltd., Tianjin 300457, China
Abstract：YLiF4:Er3+, Yb3+ was synthesized by hydrothermal method. The concentration of Er3+ was 2 mol%, and Yb3+ changed from 0 to 7 mol%. At room temperature the absorbance of YLiF4:Er3+, Yb3+ in all samples was measured from 200 to 1 200 nm. The absorbance around 980 nm increased with increasing Yb3+ concentration. The result shows that the upconversion intensity excited at 980 nm was enhanced. The enhanced intensity is dependent on the Yb3+ concentration. The excitation spectra and photoluminescence spectra were measured in the sample with Yb3+ 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.
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