Nanostructured re-doped SiO 2 -base fluorescent materials...

Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides

Reexamination Certificate

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C501S032000, C501S012000, C501S054000, C501S133000, C977S778000, C977S811000, C977S834000, C065S017600, C065S033100

Reexamination Certificate

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07407604

ABSTRACT:
A new class of nanostructured RE-doped SiO2-base materials that display superior fluorescence properties is provided. In particular, high gain combined with a broad and flat spectral band width is observed in material composed of a high fraction of a nano-dispersed metastable silicate phase in a glassy SiO2matrix, produced by partial devitrification (crystallization) of several glassy Al2O3/Er2O3- and Y2O3/Er2O3-doped SiO2compositions. Also, a highly deconvoluted spectral emission, with several prominent peaks, is observed in completely devitrified material, consisting of a uniform nano-dispersion of an equilibrium silicate phase in a crystobalite SiO2matrix. Such enhanced fluorescence properties were observed in heat treated nanopowders prepared by vapor-phase, solgel, rapid solidification, and spray-pyrolysis methods.

REFERENCES:
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Kepiński, L., Wolcyrz, “Nanocrystalline Rare Earth Silicates: Structure and Properties,”Materials Chemistry and Physics, 81, pp. 396-400, Aug. 28, 2003.
Anh, T. Kim, Minh L. Quoc, Vu, N., Huong, T. Thu, Huong, N. Thanh, Barthou, C. and Strek, W. “Nanomaterials Containing Rare-Earth Ions Tb, Eu, Er and Yb: Preparation, Optical Properties and Application Potential,”Journal of Luminescence, 102-103, pp. 391-394, May 2003.
Haines, Christopher D., Ranganathan, Varadh, Halpern, Susan B., Kear, Bernard H., Klein, Lisa C., Sigel, Jr., George H., and Yao, Nan, “Broad, Flat Fluorescence Emissions from Nanostructured Rare-Earth Dope Silicates,”Proceedings of SPIE, 5450, pp. 431-438, Sep. 2004, Strasbourg, France.

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