Luminescent screen

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H - Electricity

01

J

31/128, 313/81

H01J 61/04 (2006.01) C09K 11/77 (2006.01) H01J 61/60 (2006.01)

Patent

CA 1039047

ABSTRACT OF THE DISCLOSURE. A luminescent beryllium-containing silicate activated by bivalent europium defined by the formula Me1-xEuxBeaSiaO3a+1, in which 0.005 ? x ? 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 equi- atomic quantity of Al. The luminescent silicate is preferably used in mercury vapour discharge lamps. -15-

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