Nanostructured re-doped SiO2-base fluorescent materials and methods for production of same
US7407604B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 2005 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Nov 26, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S977/834
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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 SiO2 matrix, produced by partial devitrification (crystallization) of several glassy Al2O3/Er2O3- and Y2O3/Er2O3-doped SiO2 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 SiO2 matrix. Such enhanced fluorescence properties were observed in heat treated nanopowders prepared by vapor-phase, solgel, rapid solidification, and spray-pyrolysis methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.