Europium, and yttrium oxide or gadolinium oxide core/shell composition, phosphor including said composition, and methods for preparing same
US9045679B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2010 |
| Grant date | Jun 2, 2015 |
| Priority date | — |
| Expiry date | Feb 22, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7795
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition including an inorganic core and a europium and yttrium oxide or gadolinium shell uniformly covering the inorganic core at a thickness greater than or equal to 300 nm is described. A phosphor including the composition is also described. In addition a process of forming the composition by: forming a suspension including the inorganic core with pH of 8 to 11; adding a solution including a europium salt and yttrium or gadolinium salt to the suspension and maintaining the pH of the reaction medium at a constant value; and separating the formed solid and calcining the same to a temperature of at most 1000° C. is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.