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Proceedings Paper

Persistent luminescence of ZnGa2O4: Cr, an outstanding biomarker for in vivo imaging
Author(s): S. K. Sharma; A. Bessiere; D. Gourier; L. Binet; B. Viana; N. Basavaraju; K. Priolkar; T. Maldiney; D. Scherman; C. Richard
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Paper Abstract

ZnGa2O4 (ZGO) is a normal spinel. When doped with Cr3+ ions, ZGO:Cr becomes a high brightness persistent luminescence material with an emission spectrum perfectly matching the transparency window of living tissues. It allows in vivo mouse imaging with a better signal to background ratio than classical fluorescent NIR probes. The most interesting characteristic of ZGO:Cr lies in the fact that its LLP can be excited with red light, well below its band gap energy and in the transparency window of living tissues. A mechanism based on the trapping of carriers localized around a special type of Cr3+ ions namely CrN2 can explain this singularity. The antisite defects of the structure are the main responsible traps in the persistent luminescence mechanism. When located around Cr3+ ions, they allow, via Cr3+ absorption, the storage of not only UV light but also all visible light from the excitation source.

Paper Details

Date Published: 7 March 2014
PDF: 6 pages
Proc. SPIE 8982, Optical Components and Materials XI, 898215 (7 March 2014); doi: 10.1117/12.2041838
Show Author Affiliations
S. K. Sharma, Institut de Recherche de Chimie Paris, CNRS (France)
A. Bessiere, Institut de Recherche de Chimie Paris, CNRS (France)
D. Gourier, Institut de Recherche de Chimie Paris, CNRS (France)
L. Binet, Institut de Recherche de Chimie Paris, CNRS (France)
B. Viana, Institut de Recherche de Chimie Paris, CNRS (France)
N. Basavaraju, Goa Univ. (India)
K. Priolkar, Goa Univ. (India)
T. Maldiney, INSERM, Unité de Technologies Chimiques et Biologiques pour la Santé, CNRS, Univ. Paris Descartes (France)
D. Scherman, INSERM, Unité de Technologies Chimiques et Biologiques pour la Santé, CNRS, Univ. Paris Descartes (France)
C. Richard, INSERM, Unité de Technologies Chimiques et Biologiques pour la Santé, CNRS, Univ. Paris Descartes (France)


Published in SPIE Proceedings Vol. 8982:
Optical Components and Materials XI
Michel J. F. Digonnet; Shibin Jiang, Editor(s)

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