NDLI: Controlling disorder in the ZnGa2O4:Cr3+ persistent phosphor by Mg2+ substitution

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Controlling disorder in the ZnGa₂O₄:Cr³⁺ persistent phosphor by Mg²⁺ substitution

Content Provider	Royal Society of Chemistry (RSC)
Author	Basavaraju, Neelima Priolkar, Kaustubh R. Sharma, Suchinder K. Gourier, Didier Bessière, Aurélie Viana, Bruno Emura, Shuichi Binet, Laurent
Copyright Year	2017
Abstract	We have studied in this work the effect of increasing structural disorder on the persistent luminescence of a Cr3+ doped zinc gallate spinel. This disorder was introduced by progressive substitution of Zn2+ by Mg2+ ions, and was studied by photoluminescence, X-ray diffraction, extended X-ray absorption fine structure (EXAFS), X-ray absorption near edge structure (XANES) and electron paramagnetic resonance (EPR) spectroscopy. It was found that increasing the Mg/Zn substitution decreases the number of Cr3+ in undistorted sites and increases the number of Cr3+ with neighbouring antisite defects and with neighbouring Cr3+ ions (referred to as Cr clusters), which in turn decreases the intensity of persistent luminescence. Both XANES and EPR spectra could be simulated by a linear combination of Cr3+ spectra with three types of Cr3+ environments. The increasing disorder was found to be correlated with a decrease of the average Cr–O bond length and a decrease of crystal field strength experienced by Cr3+ ions.
Starting Page	1369
Ending Page	1377
Page Count	9
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	2
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c6cp06443d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Absorption spectroscopy Extended X-ray absorption fine structure Gallic acid X-ray absorption near edge structure Chemical bond Crystal field theory EPR Luminescence Photoluminescence Zinc X-ray crystallography Spinel Linear combination X-ray absorption spectroscopy Electron paramagnetic resonance
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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