The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2009
Filed:
Feb. 10, 2005
Peter J. Schmidt, Aachen, DE;
Thomas Jüstel, Witten, DE;
Henning Höppe, Kirchanschöring, DE;
Wolfgang Schnick, Gauting, DE;
Peter J. Schmidt, Aachen, DE;
Thomas Jüstel, Witten, DE;
Henning Höppe, Kirchanschöring, DE;
Wolfgang Schnick, Gauting, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An illumination system includes a radiation source and a fluorescent material including at least one phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of wavelength different from that of the absorbed light. The phosphor includes a yellow red-emitting cerium-activated carbido-nitridosilicate of general formula (RE)EASiNC:Cewhere 0≦a<1, 0<z≦0.2, EA is at least one earth alkaline metal selected from the group of calcium, strontium and barium, and RE is a least one rare earth metal chosen from the group of yttrium, gadolinium and lutetium. The phosphor may include a red to yellow-emitting cerium-activated carbido-nitridosilicate of general formula (RE)EASiNC:Cewhere 0≦a<1, 0<z≦0.2, EA is at least one earth alkaline metal selected from the group of calcium, strontium and barium, and RE is a least one rare earth metal chosen from the group of yttrium, gadolinium and lutetium.