| Literature DB >> 21643271 |
Aurélie Bessière1, Sylvaine Jacquart, Kaustubh Priolkar, Aurélie Lecointre, Bruno Viana, Didier Gourier.
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.Entities:
Year: 2011 PMID: 21643271 DOI: 10.1364/OE.19.010131
Source DB: PubMed Journal: Opt Express ISSN: 1094-4087 Impact factor: 3.894