Discharge lamp with an arrangement of phosphor layers...

Details Discharge lamp with an arrangement of phosphor layers... Discharge lamp with an arrangement of phosphor layers...

2007-09-04

2007-09-04

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

C313S485000, C313S486000

Reexamination Certificate

active

10852126

ABSTRACT:
A discharge lamp (1) having a discharge vessel (2) which surrounds a discharge medium which emits electromagnetic radiation in the VUV region when the lamp is operating has, on the inner side of the discharge vessel wall, a first phosphor layer, which faces the discharge medium and comprises a UVA component which can be excited by the VUV radiation and is intended to emit electromagnetic radiation in the UVA region. A second phosphor layer, which can be excited by the UVA radiation and is intended to emit electromagnetic radiation in the visible region either lies beneath the first phosphor layer or is applied to the outer side of the discharge vessel wall. This results in a lower color locus shift compared to a conventional phosphor mixture, which can be excited directly by VUV radiation.

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