Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Patent
1989-02-21
1990-12-25
Childs, Sadie
Coating processes
Electrical product produced
Fluorescent or phosphorescent base coating
427 70, 427237, 427255, 4274192, B05D 506, B05D 512
Patent
active
049798936
ABSTRACT:
The lumen maintenance of fluorescent lamps containing yttrium vanadate phosphors is markedly improved by the presence of a protective oxide layer for the phosphor. The protective oxide layer is produced by evaporating aluminum isopropoxide, in a vacuum, over phorphor particles forming a continuous aluminum isopropoxide over the phosphor particles. The isopropoxide coating is subsequently oxidized by lehring the phosphor at a temperature from about 500.degree. C. to 625.degree. C. forming an alumina coating on the phosphor particles.
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Hunt, Jr. Roger B.
Pappalardo Romano G.
Peters Thomas E.
Childs Sadie
Craig Frances P.
Ericson Ivan L.
GTE Laboratories Incorporated
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