The effect of Mg2+ ion on the optical characteristics of rare-earth ion in CaWO4 polycrystal

3rd International Conference on New Material and Chemical Industry

材料科学;化学工业

Shi, L.S.^1 ; Xu, Y.L.^2 ; Lu, Y.L.^1 ; Zheng, W.^2 ; Li, Y.M.^2

School of Material Science and Engineering, Harbin University of Science and Technology, Harbin

150080, China^1

Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin

150001, China^2

关键词: Cross-relaxation process;    Green upconversion;    High temperature solid-state reaction;    Host materials;    Optical characteristics;    Power pumps;    Rare earth ions;    Up-conversion emission;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/479/1/012083/pdf
DOI  :  10.1088/1757-899X/479/1/012083

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The MgxCa(1-x)WO4 polycrystals codoped with Er/Yb and Tm/Yb were prepared by the high temperature solid-state reaction method. The structural properties of Mg x Ca(1-x)WO4 polycrystals codoped with Er3+ and Yb3+ ions were confirmed by the X-ray diffraction patterns. The effect of Mg2+ ion on the optical characteristics of Er3+ and Tm3+ ions in CaWO4 polycrystals under 980 nm excitation was investigated. The strong blue and green upconversion emissions were observed for CaWO4 polycrystal doped with 30 mol% Mg2+ ions. The Mg2+ ions affected the optical characteristics of Er3+ and Tm3+ ions in CaWO4 host material through tuning the rate of cross relaxation process. Studies on the upconversion emission spectra and power pump dependence of Er/Yb:Mg0.3Ca0.7WO4 polycrstals indicated that the inefficient cross relaxation processes of 4S3/2 + 4I15/2 → 4I9/2 + 4I13/2 and 4S3/2 + 4I15/2 → 4I13/2 + 4I9/2 between Er3+ ions were contribution to the increased green upconversion emission under 980 nm excitation.