Cerium magnesium aluminate luminescent compositions, and lamps utilizing same
US4088922A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1976 |
| Grant date | May 9, 1978 |
| Priority date | — |
| Expiry date | Aug 30, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7721
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Cerium magnesium aluminate luminescent compositions containing from about 1.25 to about 6.25 mole percent of cerium oxide, from about 1.25 to about 6.25 mole percent of magnesium oxide and from about 87.5 to about 97.5 mole percent of aluminum oxide and compositions containing from about 1.25 to about 4.5 mole percent of cerium oxide, from about 6.25 to 14 mole percent of magnesium oxide and from about 81.5 to about 92.5 mole percent of aluminum oxide, the percentage being calculated on the basis of CeO.sub.1.5, MgO and AlO.sub.1.5, are efficient ultraviolet light emitting materials when excited by 254 nanometer energy. Up to 50 mole percent of the cerium oxide (on a CeO.sub.1.5 basis) content can be replaced by an equivalent molar amount of strontium oxide, calcium oxide or barium oxide. The materials are self-activating due to the presence of trivalent cerium. The good temperature dependence of these materials and their emission characteristics enable the production of high quality lamps useful for the treatment of psoriasis as well as conventional high loaded fluorescent lamps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.