| 摘要 |
A new class of nanostructured RE-doped SiO<SUB>2</SUB>-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 SiO<SUB>2 </SUB>matrix, produced by partial devitrification (crystallization) of several glassy Al<SUB>2</SUB>O<SUB>3</SUB>/Er<SUB>2</SUB>O<SUB>3</SUB>- and Y<SUB>2</SUB>O<SUB>3</SUB>/Er<SUB>2</SUB>O<SUB>3</SUB>-doped SiO<SUB>2 </SUB>compositions. 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 SiO<SUB>2 </SUB>matrix. Such enhanced fluorescence properties were observed in heat treated nanopowders prepared by vapor-phase, solgel, rapid solidification, and spray-pyrolysis methods.
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