AVS 50th International Symposium
    Nanometer Structures Tuesday Sessions
       Session NS-TuP

Paper NS-TuP3
Synthesis of Nanocrystalline Semiconductors and Phosphors by Thermal Self Assembly

Tuesday, November 4, 2003, 5:30 pm, Room Hall A-C

Session: Poster Session
Presenter: M. Abboudi, Universite Abdelmalek Essaadi, Morocco
Authors: M. Abboudi, Universite Abdelmalek Essaadi, Morocco
S.Y. Seo, University of Florida
J. Bang, University of Florida
A. Benali, Universite Abdelmalek Essaadi, Morocco
P.H. Holloway, University of Florida
Correspondent: Click to Email
A new method has been used to produce luminescent and semiconducting nanopowders by thermo-decomposition of precursors prepared in situ by a direct solid state reaction. This represents a new self assembly approach for the synthesis of nanocrystalline materials. Oxide phosphors prepared by this method include ZnGa@sub2@O@sub4@ doped with europium or manganese, and Y@sub2@O@sub3@ doped with europium. All the synthesized powders have been characterized by X -Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The photoluminescence and the cathodoluminescence from these phosphors with an average particle size of @<=@ 50nm have been studied with varying doping concentrations. Optimized concentrations will be reported and the luminescent spectra shown to be characteristics of the normal transitions for the dopants. The relative luminescence efficiencies will be shown to be good for these nanoparticles. We have also prepared nanocrystalline GaN powders, and will report on the defect structure from luminescence data. Finally, synthesis of Fe@sub2@O@sub3@ with particle diameters @<=@ 25nm, and Ce@sub0.8@Gd@sub0.2@O@sub1.9@ with a specific surface area of 29 m@super2@ per gram will be reported. Potential applications of these nanoparticles to phosphors, catalysts, photovoltaics, data storage, fuel cells and sensors will be discussed.