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8352009 
Journal Article 
ZnGa2O4:Cr3+: a new red long-lasting phosphor with high brightness 
Bessière, A; Jacquart, S; Priolkar, K; Lecointre, A; Viana, B; Gourier, D; , 
2011 
1 
Optics Express
ISSN: 1094-4087 
OPTICAL SOC AMER 
WASHINGTON 
10131-10137 
English 
21643271 
WOS:000290852800011 
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.