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

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 MgxCa(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 optic...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-02, Vol.479 (1)
Main Authors: Shi, L S, Xu, Y L, Lu, Y L, Zheng, W, Li, Y M
Format: Article
Language:English
Subjects:
Calcium tungstates
Cross relaxation
Diffraction patterns
Emission analysis
Emission spectra
Erbium
Excitation
High temperature
Metal ions
Optical properties
Polycrystals
Rare earth elements
Scheelite
Thulium
Upconversion
Ytterbium
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Summary: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 MgxCa(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.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/479/1/012083