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Novel scheelite structures of Li2Ca(WO4)2, Li2Ca2(WO4)(SiO4), and LiCa2(WO4)(PO4) fluorescent materials were successfully prepared using a high-temperature solid-phase process. The compounds were characterized by X-ray diffraction and energy dispersive spectroscopy. The tests revealed that the substitution of [WO4]2- by [SiO4]4- or [PO4]3- tetrahedron in tungstate had no significant influence on the crystal structure of the Li2Ca(WO4)2. When Dy3+ ions were introduced as an activator at an optimum doping concentration of 0.08 mol%, all of the as-prepared phosphors generated yellow light emissions, and the emission peak was located close to 576 nm. Replacing [WO4]2- with [SiO4]4- or [PO4]3- tetrahedron significantly increased the luminescence of the Li2Ca(WO4)2 phosphors. Among them, the LiCa2(WO4)(PO4):0.08Dy3+ phosphor had the best luminescence properties, decay life (τ = 0.049 ms), and thermal stability (87.8%). In addition, the as-prepared yellow Li2Ca(WO4)2:0.08Dy3+, Li2Ca2(WO4)(SiO4):0.08Dy3+, and LiCa2(WO4)(PO4):0.08Dy3+ phosphor can be used to fabricate white light emitting diode (LED) devices.


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Effect of anionic group [SiO4]4-/[PO4]3- on the luminescence properties of Dy3+-doped tungstate structural compounds

Show Author's information Ning LIUa,bLefu MEIb( )Jianxiong BINbZe ZHANGbZhijian PENGa( )
School of Science, China University of Geosciences (Beijing), Beijing 100083, China
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences (Beijing), Beijing 100083, China

Abstract

Novel scheelite structures of Li2Ca(WO4)2, Li2Ca2(WO4)(SiO4), and LiCa2(WO4)(PO4) fluorescent materials were successfully prepared using a high-temperature solid-phase process. The compounds were characterized by X-ray diffraction and energy dispersive spectroscopy. The tests revealed that the substitution of [WO4]2- by [SiO4]4- or [PO4]3- tetrahedron in tungstate had no significant influence on the crystal structure of the Li2Ca(WO4)2. When Dy3+ ions were introduced as an activator at an optimum doping concentration of 0.08 mol%, all of the as-prepared phosphors generated yellow light emissions, and the emission peak was located close to 576 nm. Replacing [WO4]2- with [SiO4]4- or [PO4]3- tetrahedron significantly increased the luminescence of the Li2Ca(WO4)2 phosphors. Among them, the LiCa2(WO4)(PO4):0.08Dy3+ phosphor had the best luminescence properties, decay life (τ = 0.049 ms), and thermal stability (87.8%). In addition, the as-prepared yellow Li2Ca(WO4)2:0.08Dy3+, Li2Ca2(WO4)(SiO4):0.08Dy3+, and LiCa2(WO4)(PO4):0.08Dy3+ phosphor can be used to fabricate white light emitting diode (LED) devices.

Keywords:

phosphors, scheelite structure, luminescence property, anion substitution
Received: 15 December 2020 Revised: 27 February 2021 Accepted: 22 March 2021 Published: 05 August 2021 Issue date: August 2021
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Publication history
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Publication history

Received: 15 December 2020
Revised: 27 February 2021
Accepted: 22 March 2021
Published: 05 August 2021
Issue date: August 2021

Copyright

© The Author(s) 2021

Acknowledgements

This work was supported by the National Natural Science Foundations of China (Grant Nos. 51872269 and 51672257) and the Fundamental Research Funds for the Central Universities (Grant Nos. 2652018305 and 2652017335).

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