Semiconductor-nanoparticle-dispersed small glass particles and process for preparing the same
US8585927B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2006 |
| Grant date | Nov 19, 2013 |
| Priority date | — |
| Expiry date | Jul 31, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/6439
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides semiconductor-nanoparticle-dispersed small silica glass particles that emit bright fluorescent light with high fluorescence quantum yield and high density, compared to the conventional semiconductor-nanoparticle-dispersed small glass particles, and that have excellent fluorescence intensity stability over time; and a process for preparing the same. The semiconductor-nanoparticle-dispersed silica glass particles have a mean particle size of not less than 10 nanometers and not more than 5 micrometers, and contain a hydrolyzed alkoxide and semiconductor nanoparticles at a concentration of not less than 2×10−5 mol/l and not more than 1×10−2 mol/l. The particles emit fluorescent light with a fluorescence quantum yield (quantum yield) of 25% or more (and 60% or more), when dispersed in a solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.