Issue 6, 2013
From the journal:

Journal of Materials Chemistry C

How to induce red persistent luminescence in biocompatible Ca3(PO4)2†

Aurélie Bessière,*a   Aurélie Lecointre,a   Rajia Aït Benhamou,ab   Emmanuelle Suard,c   Gilles Walleza  and  Bruno Vianaa  

* Corresponding authors

a Chimie Paristech, Laboratoire de Chimie Matière Condensée de Paris, UPMC, Collège de France, UMR - CNRS 7574, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
E-mail: aurelie-bessiere@chimie-paristech.fr

b Université Cadi Ayyad, Laboratoire de la Matière Condensée et de l'Environnement, Faculté des Sciences-Semlalia, Marrakech, Morocco

c Institut Laue-Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France

Abstract

Highly biocompatible β-TriCalcium Phosphate (β-TCP) β-Ca3(PO4)2 was tailored to emit intense red persistent luminescence suitable for small animal in vivo imaging. Mn2+ substituting the octahedral Ca5 site was selected as the luminescent dopant showing 4T1 (4G) → 6A1 (6S) emission at ∼660 nm. TCP:Mn2+ annealed in Ar–H2 showed only low temperature thermally stimulated luminescence (TSL) and therefore persistent luminescence at room temperature (RT) was weak. Ln3+ (Ln = Tb, Dy) co-doping strongly enhanced Mn2+ X-ray excited optical luminescence while totally annihilating TSL. A subsequent Ar–H2 annealing of (Ln3+, Mn2+) codoped TCPs restored intense TSL. The TSL mechanism was described in terms of deep hole trapping at Mn2+ and shallow electron trapping at defects created by reduction, i.e. most probably diphosphates. While Tb3+ co-doping promoted below RT TSL peaks, Dy3+ co-doping induced intense TSL between 320 and 450 K. TCP:Mn2+,Dy3+ annealed in Ar–H2 therefore showed highly enhanced X-ray excited persistent luminescence relative to the silicate reference used for in vivo imaging.

Graphical abstract: How to induce red persistent luminescence in biocompatible Ca3(PO4)2

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Article information

DOI
https://doi.org/10.1039/C2TC00138A
Article type
Paper
Submitted
06 Sep 2012
Accepted
27 Nov 2012
First published
27 Nov 2012

J. Mater. Chem. C, 2013,1, 1252-1259

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How to induce red persistent luminescence in biocompatible Ca3(PO4)2

A. Bessière, A. Lecointre, R. A. Benhamou, E. Suard, G. Wallez and B. Viana, J. Mater. Chem. C, 2013, 1, 1252 DOI: 10.1039/C2TC00138A

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