文章基本信息

标题：Tuning oxygen vacancy photoluminescence in monoclinic Y2WO6 by selectively occupying yttrium sites using lanthanum
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作者：Bangfu Ding ; Chao Han ; Lirong Zheng 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep09443
语种：English
出版社：Springer Nature
摘要：The effect of isovalent lanthanum (La) doping on the monoclinic Y₂WO₆ photoluminescence was studied. Introducing the non-activated La³⁺ into Y₂WO₆ brings new excitation bands from violet to visible regions and strong near-infrared emission, while the bands position and intensity depend on the doping concentration. It is interesting to find that doping La³⁺ into Y₂WO₆ promotes the oxygen vacancy formation according to the first-principle calculation, Raman spectrum, and synchrotron radiation analysis. Through the Rietveld refinement and X-ray photoelectron spectroscopy results, La³⁺ is found to mainly occupy the Y2 (2f) site in low-concentration doped samples. With increasing doping concentration, the La³⁺ occupation number at the Y3 (4g) site increases faster than those at the Y1 (2e) and Y2 (2f) sites. When La³⁺ occupies different Y sites, the localized energy states caused by the oxygen vacancy pair change their position in the forbidden band, inducing the variation of the excitation and emission bands. This research proposes a feasible method to tune the oxygen vacancy emission, eliminating the challenge of precisely controlling the calcination atmosphere.