Light emitting devices based on the excitation of phosphor scree

Details Light emitting devices based on the excitation of phosphor scree Light emitting devices based on the excitation of phosphor scree

1977-11-07

1979-10-16

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

041715012

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 O<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 O<a<1.0 and 0<b.ltoreq.1.0.

REFERENCES:
patent: 2622221 (1952-12-01), Beese
patent: 3211666 (1965-10-01), McAllister
patent: 3250722 (1966-05-01), Borchardt
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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