Citation: Ya-Li XUE, Dan ZHAO, Xiao-Qi CUI, Xiao-Yang HAN, Bao-Zhong LIU, Yan-Ping FAN. Crystal Structure of Scheelite-type LiTb(WO₄)₂ and Multi-color Emitting Properties Doped by Eu³⁺[J]. Chinese Journal of Structural Chemistry, ;2020, 39(2): 310-320. doi: 10.14102/j.cnki.0254–5861.2011–2405 shu

Crystal Structure of Scheelite-type LiTb(WO₄)₂ and Multi-color Emitting Properties Doped by Eu³⁺

College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Corresponding author: Dan ZHAO, iamzd1996@163.com Yan-Ping FAN, fanyanping@hpu.edu.cn
Received Date: 16 April 2019
Accepted Date: 3 September 2019

Fund Project: the National Natural Science Foundation of China 51871090the National Natural Science Foundation of China U1804135the National Natural Science Foundation of China 51671080Plan for Scientific Innovation Talent of Henan Province 194200510019

Figures(8)

Single crystal of lithium terbium tungstate LiTb(WO₄)₂ has been grown by the flux method. The crystal structure was refined from single-crystal X-ray data. It crystallizes in tetragonal system, space group I4₁/a with a = 5.1749(9), c = 11.1953(19) Å, V = 299.81(12) Å³, Z = 2, M_r = 661.56, D_c = 7.328 g/cm³, F(000) = 560, μ(MoKα) = 49.94 mm^-1, R(F² > 2σ(F²)) = 0.026 and wR(F²) = 0.070. It features a typical scheelite-type structure composed of two-direction packing of isolated WO₄ tetrahedra. Li and Tb atoms in the structure occupy the same crystallographic site. Moreover, a series of solid solution phosphors LiTb_1-xEu_x(WO₄)₂ (x = 0.004~0.1) were synthesized by high temperature solid-state reactions. The phosphors could be effectively excited by a wavelength range from 379 to 487 nm, which matches well with the UV and near-UV LED chip. The emission color of the phosphor can be tuned from green, through yellow to red by simply adjusting the relative Eu³⁺ and Tb³⁺ concentration due to the Tb³⁺ to Eu³⁺ energy transfer.
- rare earth compounds,
- crystal structure,
- optical properties,
- phosphor,
- charge transfer
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Crystal Structure of Scheelite-type LiTb(WO4)2 and Multi-color Emitting Properties Doped by Eu3+

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Crystal Structure of Scheelite-type LiTb(WO₄)₂ and Multi-color Emitting Properties Doped by Eu³⁺