Europium-doped yttrium oxide phosphor
US5525259A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1992 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Apr 2, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7787
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a large size Y.sub.2 O.sub.3 :Eu lamp phosphor as a red component for a water degradation resistant blend of fluorescent phosphors having large sized green phosphor particles and the method for making by blending yttrium oxide and europium oxide with fluxing agents, firing, milling the fired phosphor; sieving the milled phosphor to obtain a phosphor with an average particle size greater than about 5 by Coulter Counter to produce a sieved phosphor, and encapsulated a conformal coating of gamma alumina on said sieved phosphor by vapor chemical vapor deposition to form a resulting coated Y.sub.2 O.sub.3 :Eu phosphor with additional phosphor components including a green phosphor to form a lamp phosphor blend, and applying the blend to a lamp as a water based suspension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.