Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1982-12-16
1984-04-03
Cooper, Jack
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
2523014R, C09K 11463
Patent
active
044410492
ABSTRACT:
A luminescent screen provided with a luminescent material having the hexagonal crystal structure, which material is an aluminate, a gallate or an aluminate gallate. The crystal structure of the luminescent material corresponds to that of at least one of the compounds .beta.-aluminium, .beta."-alumina and the hexagonal ferrites. The luminescent material is activated by at least one of the elements manganese, europium, lead, thallium, cerium, indium, terbium, dysprosium and bismuth and is a ternary compound whose composition can be represented in the ternary phase diagram ABC in which A represents at least one of the oxides 1/4Na.sub.2 O, 1/2K.sub.2 O, 1/2Rb.sub.2 O, 1/2Cs.sub.2 O, CaO, SrO, BaO, 1/2La.sub.2 O.sub.3, 1/2Ce.sub.2 O.sub.3, 1/2Tb.sub.2 O.sub.3, 1/2Dy.sub.2 O.sub.3, 1/2Bi.sub.2 O.sub.3, EuO, PbO, 1/2Tl.sub.2 O and 1/2In.sub.2 O, in which B represents at least one the oxides Al.sub.2 O.sub.3 and Ga.sub.2 O.sub.3 in which up to 25 mol. % of the oxides denoted by B may be replaced by Sc.sub.2 O.sub.3 and in which C represents at least one of the oxides MgO, ZnO, BeO, 1/2LiAlO.sub.2 and 1/2LiGaO.sub.2. The content of A is more than zero and less than that of B and the content of C is more than zero and less than 0.6.
REFERENCES:
patent: 2590411 (1952-03-01), Isenberg
patent: 3597365 (1971-08-01), Ward
patent: 4088922 (1978-05-01), Wolfe
patent: 4246630 (1981-01-01), Wolfe
de Meester Emiel P. J.
Van de Spijker Willebrordus H. M. M.
Verlijsdonk Johannus G.
Verriet Johannes G.
Verstegen Judicus M. P. J.
Cooper Jack
Spain Norman N.
U.S. Philips Corporation
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