Zinc silicate phosphor and electron excited fluorescent display device using the phosphor
AssigneeKasei Optonix, Ltd.
InventorsMasachika Yaguchi, Tomoki Mikami, Takashi Hase
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Abstract
A zinc silicate phosphor represented by the formula: (Zn.sub.1-x-2y, M.sup.II.sub.x, Na.sub.2y).sub.2 SiO.sub.4 :Mn.sub.a, As.sub.b, M.sub.c (I) where M.sup.II is at least one element selected from the group consisting of barium, calcium and strontium, M is at least one of antimony and bismuth, and x, y, a, b and c satisfy the conditions of O.ltoreq.x.ltoreq.5.times.10.sup.-2, O.ltoreq.2y.ltoreq.5.times.10.sup.-3, 5.times.10.sup.-5 .ltoreq.a.ltoreq.3.times.10.sup.-2, O.ltoreq.b.ltoreq.5.times.10.sup.-3 and O<c.ltoreq.1.times.10.sup.-2, respectively (provided x+2y.noteq.0).
Claims15
A zinc silicate phosphor represented by the formula:
- (Zn.sub.1-x-2y, M.sup.II.sub.x, Na.sub.2y).sub.2 SiO.sub.4 :Mn.sub.a, As.sub.b, M.sub.c (I)
- where M.sup.II is at least one element selected from the group consisting of barium, calcium and strontium, M is at least one of antimony and bismuth, and x, y, a, b and c satisfy the conditions of 0.ltoreq..times..ltoreq.5.times.10.sup.-2, 0.ltoreq.2y.ltoreq.5.times.10.sup.-3, 5.times.10.sup.-5 .ltoreq.a.ltoreq.3.times.10.sup.-2, 0.ltoreq.b.ltoreq.5.times.10.sup.-3 and 0<c.ltoreq.1.times.10.sup.-2, respectively, provided x+2y.noteq.0, and exhibiting a higher fluorescence maintaining rate than said phosphor where c=0, and a higher fluorescence maintaining rate than said phosphor where x+2y=0.
An electron excited fluorescent display device having a fluorescent screen, wherein a zinc silicate phosphor represented by the formula:
- (Zn.sub.1-x-2y, M.sup.II.sub.x, Na.sub.2y).sub.2 SiO.sub.4 :Mn.sub.a, As.sub.b, M.sub.c (I)
- where M.sup.II is at least one element selected from the group consisting of barium, calcium and strontium, M is at least one of antimony and bismuth, and x, y, a, b and c satisfy the conditions of 0.ltoreq.x.ltoreq.5.times.10.sup.-2, 0.ltoreq.2y.ltoreq.5.times.10.sup.-3, 5.times.10.sup.-5 .ltoreq.a.ltoreq.3.times.10.sup.-2, 0.ltoreq.b.ltoreq.5.times.10.sup.-3 and 0<c.ltoreq.1.times.10.sup.-2, respectively, provided x+2y.noteq.0, and exhibiting a higher fluorescence maintaining rate than said phosphor where c=0 and a higher fluorescence maintaining rate than said phosphor where x+2y=0, is used as a green emitting component of the fluorescent screen.
Dependencies are inferred from the claim text.