Fluorescent lamp having a multi-layer phosphor optimized for lum

Details Fluorescent lamp having a multi-layer phosphor optimized for lum Fluorescent lamp having a multi-layer phosphor optimized for lum

1988-09-30

1989-11-07

Yusko, Donald J.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

H01J 6148

Patent

active

048794929

ABSTRACT:
In a fluorescent lamp having a multi-layer phosphor, a halophosphate-containing layer having color coordinates within an oval centered on X=0.382 and Y=0.384. A rare earth activated phosphor layer has approximately the same color coordinates. The area density ratio of the rare earth and halophosphate-containing phosphor layers is between 0.088 to 0.222 and preferably between 0.088 to 0.133.

REFERENCES:
patent: 4431941 (1984-02-01), Roy et al.

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