Fluorescent lamp having ultraviolet reflecting layer

Details Fluorescent lamp having ultraviolet reflecting layer Fluorescent lamp having ultraviolet reflecting layer

Category

H - Electricity

Subcategory

01

Subsubcategory

J

IPC codes

H01J 61/35 (2006.01) C03C 17/34 (2006.01) H01J 61/40 (2006.01) H01J 61/42 (2006.01)

Type

Patent

Patent number

CA 2183387

Description

A fluorescent lamp with an ultraviolet reflecting barrier layer between the glass envelope and the phosphor layer(s). The barrier layer is a blend of gamma alumina and alpha alumina, preferably 5-80 weight percent gamma alumina and 20-95 weight percent alpha alumina. The barrier layer is effective to reflect UV light back into the phosphor layer(s), leading to improved phosphor utilization and more efficient production of visible light.

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