Method of making green emitting alkaline earth aluminate phosphor for VUV excited light emitting device
US6423248B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2000 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Apr 6, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/643
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Small particle manganese activated alkaline earth aluminate phosphors are produced by thermal decomposition of gels or powders comprising alkaline earth, manganese salts and an organic precursor such as aluminum isopropoxide at a temperature below the normal solid state reaction temperature. The phosphor of the present invention has the empirical formula:(AE1-xMnx)O·6(Al2O3)wherein AE is selected from Ba, Sr, Ca and Mg and 0.01≦×≦0.1, having a band emission in the green region, peaking at 516 nm when excited by 147 and 173 nm radiation from Xenon gas mixture. The phosphor obtained by the present method, having uniform particle size distribution (0.05 to 5 microns), is appropriate for thin phosphor screens required for a variety of flat panel display and lamp applications. These phosphors also exhibit high brightness, good color saturation, better stability and shorter persistence when excited with 147 and 173 nm radiation than the currently available commercial phosphor, manganese activated zinc silicate for plasma display panels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.