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Highly Luminescent Composite Films from Core-Shell Oxide Nanocrystals

Published online by Cambridge University Press:  01 February 2011

Valérie Buissette ,
Mélanie Moreau ,
Thierry Gacoin ,
Thierry Le Mercier  and
Jean-Pierre Boilot
Valérie Buissette
Affiliation:
Groupe de Chimie du Solide, Laboratoire de Physique de la Matière Condensée, CNRS UMR 7643, Ecole Polytechnique, 91128 Palaiseau cedex (France).
Mélanie Moreau
Affiliation:
Groupe de Chimie du Solide, Laboratoire de Physique de la Matière Condensée, CNRS UMR 7643, Ecole Polytechnique, 91128 Palaiseau cedex (France).
Thierry Gacoin
Affiliation:
Groupe de Chimie du Solide, Laboratoire de Physique de la Matière Condensée, CNRS UMR 7643, Ecole Polytechnique, 91128 Palaiseau cedex (France).
Thierry Le Mercier
Affiliation:
Centre de Recherches d'Aubervilliers, Rhodia, 52, rue de la Haie Coq, 93308, Aubervilliers (France).
Jean-Pierre Boilot
Affiliation:
Groupe de Chimie du Solide, Laboratoire de Physique de la Matière Condensée, CNRS UMR 7643, Ecole Polytechnique, 91128 Palaiseau cedex (France).
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Abstract

Luminescent nanocrystals can find interesting applications for the elaboration of light emitting transparent materials. The work described here is based on the use of lanthanide doped vanadate (YVO4:Eu) and phosphate (La, Ce, Tb)PO4-0, 7H2O nanoparticles grown through aqueous colloidal synthesis, with average sizes below 10 nm. The well-dispersed colloids are transparent and respectively exhibit red and green luminescence under U.V. excitation with high luminescence yields (20 – 50 %). Improvement of luminescence properties of the nanocrystals is achieved through the elaboration of core/shell nanostructures, obtained after the growth at the surface of an amorphous silica shell or a crystalline lanthanum phosphate shell. Surface derivatization is further achieved through the controlled growth of an organically modified silica coating using a functionalized silane precursor. Concentrated sols are obtained, which are highly luminescent and well-dispersed. They can be spin-coated on various substrates, leading to perfectly transparent and highly luminescent thin films. Multi-layers films and heating treatments are performed, leading to optimized materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 846: Symposium DD – Organic and Nanocomposite Optical Materials , 2004 , DD7.8
Copyright
Copyright © Materials Research Society 2005

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