Magnesium aluminate gallate phosphors and reprographic lamp containing same
US3992645A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1976 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Mar 22, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/44
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Improved magnesium aluminate gallate phosphors activated by manganese are prepared containing a minor addition of stabilizer ion to avoid brightness loss when the phosphor is heated in air. The stabilizer addition also permits major substitution of aluminum for gallium along with increased manganese activator content resulting in higher powder brightness in room temperatures, greater ultraviolet absorption, and a desirable shift in spectral peak of emission response along with better resistance to oxidation when heated in air. The phosphor is particularly useful to provide improved maintenance in low-pressure mercury lamps for reprographic applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.