Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1992-03-31
1994-05-03
Yusko, Donald J.
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
313485, 313487, 313489, H01J 6304, H01J 162
Patent
active
053090691
ABSTRACT:
A fluorescent lamp providing improved maintenance and brightness includes an alkaline earth halophosphate (Cool-White) phosphor, e.g. a calcium halophosphate phosphor, having a continuous protective bilayer coating of alumina surrounding silica surrounding the phosphor particles. The lamp may be a high color rendition fluorescent lamp in which a first layer of alkaline earth halophosphate phosphor coats an inner surface of the lamp envelope, and a second layer of phosphor overlies the first layer of phosphor. The second layer of phosphor is a mixture of red, blue and green emitting phosphors, at least one of these being a zinc silicate phosphor. Each of the alkaline earth halophosphate and zinc silicate phosphors have a bilayer coating in which a coating of alumina surrounds a coating of silica which surrounds the phosphor.
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patent: 4585673 (1968-04-01), Sigai
patent: 4691140 (1987-09-01), Sakakibara
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Klinedinst Keith A.
Sigai A. Gary
Clark Robert F.
Craig Frances P.
Esserman Matthew J.
GTE Products Corporation
Levy Elizabeth A.
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