Electric lamp and discharge devices – Cathode ray tube – Screen
Patent
1978-02-10
1980-08-05
Cooper, Jack
Electric lamp and discharge devices
Cathode ray tube
Screen
2523014R, 2523016R, 313467, 313486, C09K 1146, H01J 2920, H01J 163
Patent
active
042164087
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 of 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:
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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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