Phosphor and electron excited fluorescent display device using t

Details Phosphor and electron excited fluorescent display device using t Phosphor and electron excited fluorescent display device using t

1988-07-25

1989-10-17

Wieder, Kenneth

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313467, 25230165, H01J 163, H01J 2920, C09K 1154

Patent

active

048749850

ABSTRACT:
A sulfide phosphor emitting green to orange light with long after-glow is represented by the formula of (ZN.sub.1-x,Cd.sub.x)S:eM.sup.I',fM.sup.III', gX' wherein M.sup.I' is at least one of copper and gold, M.sup.III' is at least one of gallium and indium, X' is at least one of chlorine, bromine, iodine, fluorine and aluminum, and x, e, f and g satisfy the conditions of 0.ltoreq.x.ltoreq.0.4, 10.sup.-8 .ltoreq.e.ltoreq.10.sup.-2, 5.times.10 .sup.-8 .ltoreq.f.ltoreq.5.times.10.sup.-3, and 5.times.10.sup.-8 .ltoreq.g.ltoreq.5.times.10.sup.-3. A white emitting phosphor is obtained by mixing the long after-glow yellow emitting phosphor represented by the above formula wherein 0.ltoreq.x.ltoreq.0.3 and 10.sup.-6 .ltoreq.e.ltoreq.10.sup.-2, with a long after-glow blue emitting phosphor. These sulfide phosphors are used to form fluorescent screens of electron excited fluorescent display devices.

REFERENCES:
patent: 2623859 (1952-12-01), Kroger et al.
patent: 2947704 (1960-08-01), Apple
patent: 3595804 (1971-07-01), Martin
patent: 3657142 (1972-04-01), Poss
patent: 3891886 (1975-06-01), Woontner
Van Gool et al., "Philips Res Repts." pp. 15,254-15,274, Jan. 1960.

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