White luminescent phosphor for use in cathode ray tube
AssigneeKabushiki Kaisha Toshiba
InventorsNaotoshi Matsuda, Yoshinori Tetsuishi, Kazuaki Higuchi
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Abstract
Disclosed is a white luminescent phosphor for use in a cathode ray tube, which comprises a mixture of at least one phosphor having a composition of the following formula: In.sub.1-p-q-r M.sub.p Eu.sub.q Tb.sub.r BO.sub.3 wherein M represents at least one element selected from the group consisting of Sc, Lu, Y, La, Gd and Ga; and each of p, q and r represents a number satisfying the relationships of p.gtoreq.0, q.gtoreq.0, r.gtoreq.0 and 0<p+q+r<1, and having a 10% afterglow period of 10 milliseconds or longer, and a blue luminescent phosphor having the composition of ZnS:Ag.
Claims13
A white emitting luminescent phosphor for use in a cathode ray tube, which consists essentially of a mixture of from about 10 to 40 wt.% of a blue luminescent phosphor having the composition of ZnS:Ag, and having a 10% afterglow period of at least 10 microseconds, and at least one phosphor having a composition of the following formula:
- In.sub.1-p-q-r M.sub.p Eu.sub.q Tb.sub.r BO.sub.3
- wherein M represents at least one element selected from the group consisting of Sc, Lu, Y, La, Gd and Ga;
- and each of p, q, and r represents a number satisfying the relationships of p.gtoreq.0, q.gtoreq.0, r.gtoreq.0 and 0<p+q+r<1, and having a 10% afterglow period of 10 milliseconds or longer.
Dependencies are inferred from the claim text.