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Controlling disorde...
Controlling disorder in the ZnGa2O4:Cr3+ persistent phosphor by Mg2+ substitution
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- Basavaraju, N. (author)
- Indian Institute of Science,Goa University
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- Priolkar, K. R. (author)
- Goa University
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- Bessiere, A. (author)
- Institut de Recherche de Chimie Paris
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- Sharma, Suchinder, 1982 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gourier, D. (author)
- Institut de Recherche de Chimie Paris
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- Binet, L. (author)
- Institut de Recherche de Chimie Paris
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- Viana, B. (author)
- Institut de Recherche de Chimie Paris
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- Emura, S. (author)
- Osaka University
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(creator_code:org_t)
- 2017
- 2017
- English.
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In: Physical Chemistry Chemical Physics. - : Royal Society of Chemistry (RSC). - 1463-9084 .- 1463-9076. ; 19:2, s. 1369-1377
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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