Terbium-activated alkaline-earth metal silicate phosphors

Details Terbium-activated alkaline-earth metal silicate phosphors Terbium-activated alkaline-earth metal silicate phosphors

1976-07-09

1978-05-09

Cooper, Jack

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

2523016F, C09K 1146

Patent

active

040885992

ABSTRACT:
A phosphor system consisting of an alkaline-earth metal silicate host lattice activated by trivalent terbium together with monovalent alkaline metal as a charge compensator, said phosphor system corresponding to the formula, X.sub.3-x Y.sub.1-x Si.sub.2 O.sub.8 : Tb.sub.x, Z.sub.x wherein X is at least one of Ba, Sr, and Ca; Y is at least one of Mg and Zn; and Z acting as a charge compensator is at least one of Li, K, and Na, and x is from 0.001 to 0.95, said phosphor system substituting Ca plus Mg for X plus Y of the formula being excluded. The present invention provides an efficient green-emitting phosphor particularly useful for a deluxe fluorescent lamp.

REFERENCES:
patent: 2821508 (1958-01-01), Crosby et al.
patent: 3260675 (1966-07-01), McAllister
patent: 3468810 (1969-09-01), Mizumo
patent: 3523091 (1970-08-01), McAllister
patent: 3544481 (1970-12-01), Barry
Peters, "J. Electrochem. Soc.", Jul., 1969 pp. 985-988.

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