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. 2011 May 23;19(11):10131-7.
doi: 10.1364/OE.19.010131.

ZnGa2O4:Cr3+: a new red long-lasting phosphor with high brightness

Aurélie Bessière  1 , Sylvaine Jacquart, Kaustubh Priolkar, Aurélie Lecointre, Bruno Viana, Didier Gourier
Affiliations
Free article

ZnGa2O4:Cr3+: a new red long-lasting phosphor with high brightness

Aurélie Bessière et al. Opt Express. .
Free article

Abstract

ZnGa2O4:Cr3+ is shown to be a new bright red UV excited long-lasting phosphor potentially suitable for in vivo imaging due to its 650 nm-750 nm emission range. Photoluminescence and X-ray excited radioluminescence show the 2E → 4A2 emission lines of both ideal Cr3+ and Cr3+ distorted by a neighboring antisite defect while long-lasting phosphorescence (LLP) and thermally stimulated luminescence (TSL) almost exclusively occur via distorted Cr3+. The most intense LLP is obtained with a nominal Zn deficiency and is related to a TSL peak at 335K. A mechanism for LLP and TSL is proposed, whereby the antisite defect responsible for the distortion at Cr3+ acts as a deep trap.

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