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Stable Upconversion Luminescence Color in BiTa7O19:Er3+/Yb3+ Phosphors.

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Title: Stable Upconversion Luminescence Color in BiTa7O19:Er3+/Yb3+ Phosphors.
Authors: Li, Meiling1 (AUTHOR), Gao, Yuefeng2 (AUTHOR) gaoyuefeng@dlmu.edu.cn, Cao, Yongze1 (AUTHOR) cyz@dlmu.edu.cn, Liu, Xu1 (AUTHOR), Yu, Changhao1 (AUTHOR), Cao, Mengxue1 (AUTHOR), Chen, Baojiu1 (AUTHOR) bjchen@dlmu.edu.cn
Source: Journal of the American Ceramic Society. Jul2026, Vol. 109 Issue 7, p1-9. 9p.
Subjects: Photon upconversion, Layer structure (Solids), Phosphors, Luminescence measurement, Doping agents (Chemistry)
Abstract: Er3+/Yb3+ co‐doped BiTa7O19 (BT7O), CaTa4O11 (CTO), LiBi4Ta3O14 (LBTO), GdTaO4 (GTO) and Bi7Ta3O18 (B7T3O) tantalate‐based phosphors are prepared. The upconversion luminescence (UCL) spectra are measured under 980 nm laser excitation, and the UCL color (green‐to‐red ratio [Sgr]) is calculated. The effects of excitation power density, Er3+/Yb3+ co‐doped concentration, and temperature on Sgr were studied. The above variables have the least impact on BT7O:Er3+/Yb3+, and BT7O:Er3+/Yb3+ possesses a stable Sgr. BT7O, CTO, LBTO and GTO all have a layered structure. Er3+/Yb3+ exhibits a 2D distribution, and the Er3+/Yb3+ distribution layer spacings are different. BT7O has the largest layer spacing of 10.02 Å, thus having the highest and most stable Sgr. In B7T3O, Er3+/Yb3+ is in a 3D distribution, thus having the lowest and most unstable Sgr. This study explored the relationship between the lattice structure and Sgr, providing new ideas for obtaining upconversion phosphors with high and stable Sgr. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Er3+/Yb3+ co‐doped BiTa7O19 (BT7O), CaTa4O11 (CTO), LiBi4Ta3O14 (LBTO), GdTaO4 (GTO) and Bi7Ta3O18 (B7T3O) tantalate‐based phosphors are prepared. The upconversion luminescence (UCL) spectra are measured under 980 nm laser excitation, and the UCL color (green‐to‐red ratio [Sgr]) is calculated. The effects of excitation power density, Er3+/Yb3+ co‐doped concentration, and temperature on Sgr were studied. The above variables have the least impact on BT7O:Er3+/Yb3+, and BT7O:Er3+/Yb3+ possesses a stable Sgr. BT7O, CTO, LBTO and GTO all have a layered structure. Er3+/Yb3+ exhibits a 2D distribution, and the Er3+/Yb3+ distribution layer spacings are different. BT7O has the largest layer spacing of 10.02 Å, thus having the highest and most stable Sgr. In B7T3O, Er3+/Yb3+ is in a 3D distribution, thus having the lowest and most unstable Sgr. This study explored the relationship between the lattice structure and Sgr, providing new ideas for obtaining upconversion phosphors with high and stable Sgr. [ABSTRACT FROM AUTHOR]
ISSN:00027820
DOI:10.1111/jace.70987