Back to results
US 4,057,507 AGranted
Europium and samarium activated rare earth oxysulfide phosphor
AssigneeHitachi, Ltd.
InventorsHajime Yamamoto, Tsuyoshi Kano, Masaki Nakano
Life of this patent
Estimating the term…
Abstract
Rare earth oxysulfide phosphors consisting essentially of a compound of a general formula, {(Y.sub.u Gd.sub.1-u).sub.1-x-y-z Eu.sub.x Sm.sub.y (Tb.sub.1-p, Pr.sub.p).sub.z}.sub.2 .sup.. O.sub.2 S, wherein 0 .ltoreq. z .ltoreq. 1 .times. 10.sup.-4, 0 .ltoreq. p .ltoreq. 1, 0 .ltoreq. u .ltoreq. 1, and x and y satisfy the area B, defined by a, b, c and d of FIG. 5. These phosphors are well adapted for use in a color television picture tube.
Claims6
A rare earth oxysulfide phosphor consisting essentially of a compound of the general formula,
- {Y.sub.u, Gd.sub.1-u).sub.1-x-y-z Eu.sub.x Sm.sub.y (Tb.sub.1-p, Pr.sub.p).sub.z }.sub.2.sup.. O.sub.2 S,
- wherein 0 .ltoreq. z .ltoreq. 1.times.10.sup.-4, 0 .ltoreq. p .ltoreq. 1, 0 .ltoreq. u .ltoreq. 1, and x and y satisfy the area B of FIG. 5 defined by a, b, c and d.
Dependencies are inferred from the claim text.