Crystal Structure of Scheelite-type LiTb(WO4)2 and Multi-color Emitting Properties Doped by Eu^3+

作     者：XUE Ya-Li ZHAO Dan CUI Xiao-Qi HAN Xiao-Yang LIU Bao-Zhong FAN Yan-Ping 薛亚丽;赵丹;崔晓琦;韩晓阳;刘宝忠;范燕平

作者机构：College of Chemistry and Chemical EngineeringHenan Polytechnic UniversityJiaozuo 454000China 

出 版 物：《Chinese Journal of Structural Chemistry》 (结构化学（英文）)

年 卷 期：2020年第39卷第2期

页      面：310-320,187页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China(No.51871090,U1804135,and 51671080) Plan for Scientific Innovation Talent of Henan Province(194200510019) Henan Postdoctoral Foundation 

主　　题：rare earth compounds crystal structure optical properties phosphor charge transfer 

摘      要：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) ?, V = 299.81(12) ?~3, Z = 2, Mr = 661.56, Dc = 7.328 g/cm^3, F(000) = 560, μ(MoKα) = 49.94 mm^(-1), R(F^2 2σ(F^2)) = 0.026 and wR(F^2) = 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-x)Eux(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 Eu^(3+) and Tb^(3+) concentration due to the Tb^(3+) to Eu^(3+) energy transfer.