Oxynitride-based fluorescent material and method for production thereof
US7679094B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Sep 28, 2005 |
| Grant date | Mar 16, 2010 |
| Priority date | — |
| Expiry date | Jan 23, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8512
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An oxynitride-based fluorescent material is formed of what results from substituting Eu for part of M of a general formula 2MO.Si3N4, wherein M denotes one or more elements selected from among Be, Mg, Ca, Sr and Ba. The oxynitride-based fluorescent material can be produced by a method comprising mixing an oxide of Be, Mg, Ca, Sr, Ba or Eu, or a compound of Be, Mg, Ca, Sr, Ba or Eu enabled by heating to form an oxide, and silicon nitride or a compound enabled by heating to form silicon nitride to obtain a mixture and firing the mixture in a vacuum or a non-oxidizing atmosphere at 1200 to 1900° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.