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

N. Basavaraju ; K. R. Priolkar ; A. Bessiere ; Suchinder Sharma (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; D. Gourier ; L. Binet ; B. Viana ; S. Emura
Physical Chemistry Chemical Physics (1463-9076). Vol. 19 (2017), 2, p. 1369-1377.
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2017-02-17.
CPL Pubid: 248211


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