Site-selective luminescence of Eu3+ ions in silicate-tungstates with apatite and scheelite structures

被引：5
|
作者：
Pustovarov V.A. [1 ]
Vasin A.A. [2 ]
Zuev M.G. [1 ,2 ]
机构：
[1] Ural Federal University, 19 Mira st., Ekaterinburg
[2] Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
来源：
Optical Materials: X | 2022年 / 15卷
基金：
俄罗斯科学基金会; 俄罗斯基础研究基金会;
关键词：
Apatite; Asymmetry coefficient; Eu[!sup]3+[!/sup] ion; Intraconfigurational f-f transitions; Photoluminescence; Scheelite;
D O I：
10.1016/j.omx.2022.100186
中图分类号：
学科分类号：
摘要：
The present work studies europium-ion spectroscopic features in solid solutions based on silicate-tungstates Ca2La6.8Eu1.2Si5.6W0.4O26.4 and Ca8Eu2Si3W3O26 microcrystalline powders with the crystal structure of silicate apatite and scheelite respectively. The spectroscopic features were studied by means of photoluminescence spectroscopy and X-ray excited luminescence at temperatures 4.6, 90 and 295 K. In Ca2La6.8Eu1.2Si5.6W0.4O26.4 only intensive luminescence was observed, which was characterized by a set of 5D0 → 7FJ dominant intraconfigurational transitions for Eu3+ ion. In Ca8Eu2Si3W3O26, both 5D0→ 7FJ intraconfigurational transitions for Eu3+ ion and wide 430 nm emission band corresponding to host self-trapped exciton (STE) emission are observed. This STE emission band is reabsorbed by the f – f absorption of Eu3+ ions by means of energy transfer from host to Eu3+. The asymmetry coefficient which characterizes the shape of the emission spectrum of Eu3+ ions strongly depends on the energy of exciting photons. The Eu3+ ion might occupy two nonequivalent crystallographic sites. Some features of this phenomenon were discussed. © 2022 The Author(s)
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