GLORIEUX, Benoit; JUBERA, Veronique; ORLOVA, Elena Arkadevna; KANUNOV, Anton; GARCIA, Alain; PALLIER, Camille; OLENEVA, Tatyana

doi:10.1134/S0020168513010032

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GLORIEUX, Benoit
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

JUBERA, Veronique
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

ORLOVA, Elena Arkadevna
Faculty of Chemistry

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Inorganic Materials / Neorganicheskie Materialy. 2013, vol. 49, n° 1, p. 82-88

MAIK Nauka/Interperiodica

Résumé en anglais

Ca0.5Zr2(PO4)3:Eu2+, Sr0.5Zr2(PO4)3:Eu2+, and Ca0.5Zr2(PO4)3:Eu2+, Sm3+ orthophosphates prepared through precipitation using sol-gel processes are analogs of NaZr2(PO4)3 (NZP) and crystallize in space group R Their crystallographic parameters determined by X ray diffraction are consistent with the interatomic distances extracted from EXAFS data. Their luminescence spectra obtained under excitation in the range 300-400 nm contain emission bands between 425 and 525 nm. Substitution of the larger sized cat ions Eu2+ and Sm3+ for Ca2+ shifts the emission bands to shorter wavelengths and reduces their width because of the decrease in the effect of the crystal field. Analysis of the spectra indicates that Eu2+ occupies two types of crystallographic sites (independent interstitial sites of different sizes and shapes in the NZP framework structure). Codoping with Eu and Sm has ensured luminescence with chromaticity coordinates approaching those of white light: (x = 0.27, y = 0.34).< Réduire

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Orthophosphates

Sol gel

Crystallography

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Phosphors based on NaZr2(PO4)3-type calcium and strontium phosphates activated with Eu2+ and Sm3+

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