Light emitting device having luminescent screen with self activa

Details Light emitting device having luminescent screen with self activa Light emitting device having luminescent screen with self activa

1974-10-22

1978-08-15

Demeo, Palmer C.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

2523014P, 313224, H01J 6116, H01J 6144

Patent

active

041075714

ABSTRACT:
A light emitting device wherein a blue screen or a red screen is excited by 5 to 25eV photons or electrons, the blue screen containing a self-activated phosphor which is represented by the general formula MP.sub.b V.sub.1-b O.sub.4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57 - 62 and 64 - 71, and group-IIIb elements of the periodic table, and where 0 <b<1.0, the red screen containing a trivalent europium (Eu.sup.3+) activated phosphor which is represented by the general formula M.sub.1-a Eu.sub.a P.sub.b V.sub.1-b O.sub.4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57 - 62 and 64 - 71, and group-IIIb elements of the periodic table, and where 0<a <1.0 and 0<b.ltoreq.1.0.

REFERENCES:
patent: 2622221 (1952-12-01), Beese
patent: 3211666 (1965-10-01), McAllister
patent: 3647706 (1972-03-01), Lagos
patent: 3670194 (1972-06-01), Thornton, Jr. et al.
patent: 3858082 (1974-12-01), Thornton, Jr.
patent: 3916245 (1975-10-01), Dorf et al.
Luminescence of Solids, by H. W. Leverenz, 1950, pp. 248, 249.

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