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New luminescent rare earth activated oxynitridosilicates and oxynitridogermanates with the apatite structure
THOMAS, Sébastien
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut de Ciència de Materials de Barcelona [ICMAB]
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Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut de Ciència de Materials de Barcelona [ICMAB]
THOMAS, Sébastien
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut de Ciència de Materials de Barcelona [ICMAB]
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Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut de Ciència de Materials de Barcelona [ICMAB]
Language
en
Article de revue
This item was published in
Journal of Materials Chemistry. 2012, vol. 22, n° 45, p. 23913-23920
Royal Society of Chemistry
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Luminescent materials
Oxynitrides
Rare earth
Origin
Hal imported