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Effects of slight structural distortion on the luminescence performance in (Ca 1‐x Eu x )WO 4 luminescent materials
Author(s) -
Wu FengNian,
Yu HuaJian,
Hu YanYan,
Zhang HuaDi,
Zhang Rui,
Li Jing,
Liu Bing,
Wang XuPing,
Yang YuGuo,
Wei Lei
Publication year - 2021
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3941
Subject(s) - luminescence , phosphor , europium , photoluminescence , scheelite , analytical chemistry (journal) , chromaticity , materials science , ion , spectroscopy , excitation , powder diffraction , doping , lattice (music) , chemistry , crystallography , optics , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , acoustics , tungsten , metallurgy
(Ca 1‐x Eu x )WO 4 (x = 0–21 mol%) phosphors were prepared using the classical solid‐state reaction method. The influence of Eu 3+ ion doping on lattice structure was observed using powder X‐ray diffraction and Fourier transform infrared spectroscopy. Furthermore, under this influence, the luminescence properties of all samples were analyzed. The results clearly illustrated that the element europium was successfully incorporated into the CaWO 4 lattice with a scheelite structure in the form of a Eu 3+ ion, which introduced a slight lattice distortion into the CaWO 4 matrix. These lattice distortions had no effect on phase purity, but had regular effects on the intrinsic luminescence of the matrix and the f–f excitation transitions of Eu 3+ activators. When the Eu 3+ concentration was increased to 21 mol%, a local luminescence centre of [WO 4 ] 2− groups was detected in the matrix and manifested as the decay curves of [WO 4 ] 2− groups and luminescence changed from single exponential to double exponential fitting. Furthermore, the excitation transitions of Eu 3+ between different energy levels (such as 7 F 0 → 5 L 6 , 7 F 0 → 5 D 2 ) also produced interesting changes. Based on analysis of photoluminescence spectra and the chromaticity coordinates in this study, it could be verified that the nonreversing energy transfer of [WO 4 ] 2− →Eu 3+ was efficient and incomplete.