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Europium-doped calcium pyrophosphates : allotropic forms and photoluminescent properties

Doat, Anne and Pellé, F. and Lebugle, Albert Europium-doped calcium pyrophosphates : allotropic forms and photoluminescent properties. (2005) Journal of Solid State Chemistry, vol. 1 (n° 7). pp. 2354-2362. ISSN 0022-4596

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Official URL: http://dx.doi.org/10.1016/j.jssc.2005.05.023

Abstract

In a search for new luminescent biological probes, we synthesized calcium pyrophosphates doped with europium up to an atomic Eu/(Eu+Ca) ratio of 2%. They were prepared by coprecipitating a mixture of calcium and europium salts with phosphate. After heating at 900°C in air, two phases coexisted, identified as the β calcium pyrophosphate form and EuPO4. Heating near 1250°C in air, during the β→ transformation, europium ions substitute for calcium ions in the * calcium pyrophosphate structure as demonstrated by the spectroscopic study. Europium ions with both valence states (divalent and trivalent) were observed in the samples. Following the synthesis procedure, partial reduction of Eu3+ took place even in an oxidizing atmosphere. The 0.5%-doped compound could serve as a sensitive probe in biological applications. Depending on the excitation wavelength, the luminescence occurs either in the red or in the blue regions, which discriminates it from parasitic signals arising from other dyes or organelles in live cells.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Solid State Chemistry website : http://www.sciencedirect.com/science/journal/00224596
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Ecole Nationale Supérieure de Chimie de Paris - ENSCP (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Thomas Bonnecarere
Deposited On:28 Aug 2008 13:33

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