ILLUMINATION SYSTEM COMPRISING A RADIATION SOURCE AND A FLUORESCENT MATERIAL

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PCT/I B2005/050521 25 PHDE040060 ABSTRACT : 25 The invention concerns an illumination system, comprising a radiation source and a fluorescent material comprising 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; wherein said at least one phosphor is a yellow red-emitting cerium-activated carbido-nitridosilicate of general formula (RE1-z)2-aEAaSi4N6+aC1-a : Cez, wherein 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 invention is also concerned with a red to yellow -emitting cerium­ 10 activated carbido-nitridosilicate of general formula (RE1-z)2-aEAaSi4N6+aC1-a : Cez wherein 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.