THOMAS, Sébastien; ORÓ-SOLÉ, Judith; GLORIEUX, Benoit; JUBERA, Veronique; BUISSETTE, Valérie; LE MERCIER, Thierry; GARCIA, Alain; FUERTES, Amparo

doi:10.1039/C2JM35168D

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THOMAS, Sébastien
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut de Ciència de Materials de Barcelona [ICMAB]

ORÓ-SOLÉ, Judith
Institut de Ciència de Materials de Barcelona [ICMAB]

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

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Journal of Materials Chemistry. 2012, vol. 22, n° 45, p. 23913-23920

Royal Society of Chemistry

Resumen en inglés

New luminescent oxynitrides based on the apatite structure doped with Eu2+ and Ce3+ have been prepared by ammonolysis of oxysilicate or oxygermanate precursors. The host compounds have the general formula La10−xSrx(Si/Ge)6O27−x/2−3y/2Ny. When doped with divalent europium or trivalent cerium they present blue, green, yellowish green or orange luminescence under UV/blue excitation. Remarkable long wavelength emissions centred beyond 500 nm are observed for the Ce3+ activated oxynitridosilicates and oxynitridogermanates, with compositions La8.9Ce0.1SrSi6N0.37O25.95, La8.9Ce0.1SrSi6N1.06O24.91 (λem = 545 nm) and La9.9Ce0.1Ge6N2.46O23.31 (λem = 590 nm). The treatment of precursor oxides with the required cationic ratios in NH3 gas was used as a convenient general method to prepare the oxynitride materials at moderate temperatures. This allowed decreasing the nitriding temperature from 1600-1400 °C to 1050-600 °C with respect to the method generally used for the synthesis of luminescent (oxy)nitride silicates, the solid state reaction between oxides, nitrides and carbonates under a N2 or N2-H2 flow.< Leer menos

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Luminescent materials

Oxynitrides

Rare earth

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New luminescent rare earth activated oxynitridosilicates and oxynitridogermanates with the apatite structure

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