Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2004-03-05
2009-08-11
Roy, Sikha (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S502000, C313S504000, C313S506000, C362S293000, C257S081000, C257S094000
Reexamination Certificate
active
07573189
ABSTRACT:
The invention relates to an illumination system comprising a radiation source and a fluorescent material comprising at least one phosphor capable of absorbing a portion of the light emitted by the radiation source and emitting light of a wavelength different from that of the absorbed light; wherein said at least one phosphor is a green-emitting cerium-activated lutetium-aluminum-garnet of general formula (Lu1-x-y-a-bYxGdy)3(Al1-zGaz)5O12:CeaPrb wherein 0<x<1, 0<y<1, 0<z£0.1, 0<a£0.2 and 0<b£0.1. The invention also relates to with a green-emitting cerium-activated lutetium-aluminum-garnet of general formula (Lu1-x-y-a-bYxGdy)3(Al1-zGaz)5O12:CeaPrb wherein 0<x<1, 0<y<1, 0<z£0.1, 0<a£0.2 and 0<b£0.1.
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Busselt Wolfgang
Juestel Thomas
Mayr Walter
Schmidt Peter
Green Tracie
Koninklijke Philips Electronics , N.V.
Roy Sikha
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