Cerium magnesium aluminate luminescent compositions, and lamps u

Details Cerium magnesium aluminate luminescent compositions, and lamps u Cerium magnesium aluminate luminescent compositions, and lamps u

1976-08-30

1978-05-09

Cooper, Jack

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

2523014R, C09K 1146, H01J 163

Patent

active

040889220

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.

REFERENCES:
patent: 3597365 (1971-08-01), Ward
Ranby et al. "Chem. Abstracts" vol. 83, 1975, p. 155577f.

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