Long-persistence blue phosphors
US6117362A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 6, 1998 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Nov 6, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to phosphors including long-persistence blue phosphors. Phosphors of the invention are represented by the general formula: EQU MO . mAl.sub.2 O.sub.3 :Eu.sup.2+,R.sup.3+ wherein m is a number ranging from about 1.6 to about 2.2, M is Sr or a combination of Sr with Ca and Ba or both, R.sup.3+ is a trivalent metal ion or trivalent Bi or a mixture of these trivalent ions, Eu.sup.2+ is present at a level up to about 5 mol % of M, and R.sup.3+ is present at a level up to about 5 mol % of M. Phosphors of this invention include powders, ceramics, single crystals and single crystal fibers. A method of manufacturing improved phosphors and a method of manufacturing single crystal phosphors are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.