Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1974-05-22
1978-11-28
Cooper, Jack
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
313486, C09K 1146
Patent
active
041274989
ABSTRACT:
A luminescent beryllium-containing silicate activated by bivalent europium defined by the formula Me.sub.1-x Eu.sub.x Be.sub.a Si.sub.a O.sub.3a+1, in which 0.005 .ltoreq.x.ltoreq.0.20 and a has the value 1 or 2 and in which Me represents at least one of the alkaline earth metals barium, strontium and calcium. If a = 2 at least 50 gram-atomic % of Me is strontium. If a = 1 up to 25 gram.atomic % of Be together with the same quantity of Si may be replaced by an equiatomic quantity of Al.
The luminescent silicate is preferably used in mercury vapor discharge lamps.
REFERENCES:
patent: 2457054 (1948-12-01), Leverenz
patent: 3544481 (1970-12-01), Barry
patent: 3651363 (1972-03-01), Barry
patent: 3813569 (1974-05-01), Verstegen et al.
patent: 3839219 (1974-10-01), Verstegen et al.
Ito et al., "Chemical Abstracts" vol. 67, 1967, p. 15826f.
Odelevskii et al., "Chemical Abstracts", vol. 54, p. 19249i.
Van de Spijker Willebrordus H. M. M.
Verlijsdonk Johannus G.
Verstegen Judicus M. P. J.
Cooper Jack
Spain Norman N.
U.S. Philips Corporation
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