Europium-doped calcium pyrophosphates: Allotropic forms and photoluminescent properties

Journal Article · Fri Jul 15 04:00:00 EDT 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.05.023· OSTI ID:20729037

Doat, A ^[1]; Pelle, F ^[2]; Lebugle, A ^[1]

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1. CIRIMAT UMR CNRS 5085, Physico-Chimie des Phosphates, ENSIACET-INPT, National Polytechnic Institute of Toulouse, 118 route de Narbonne, 31077 Toulouse Cedex 4 (France)
2. Laboratoire de Chimie Appliquee de l'Etat Solide, CNRS-UMR 7574 Chimie de la Matiere Condensee de Paris, ENSCP, 11 Rue Pierre et Marie Curie, 75231 Paris Cedex 5 (France)

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{sup o}C in air, two phases coexisted, identified as the {beta} calcium pyrophosphate form and EuPO{sub 4}. Heating near 1250{sup o}C in air, during the {beta}->{alpha} transformation, europium ions substitute for calcium ions in the {alpha} 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 Eu{sup 3+} 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.

• OSTI ID: 20729037
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 7 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CALCIUM COMPOUNDS
CALCIUM IONS
DOPED MATERIALS
EUROPIUM COMPOUNDS
EUROPIUM IONS
EXCITATION
HEATING
PHASE TRANSFORMATIONS
PHOTOLUMINESCENCE
PYROPHOSPHATES
REDUCTION
SYNTHESIS