Illumination system comprising a radiation source and a fluorescent material

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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 (RE1−z)2−aEAaSi4N6+aC1−a : Cez where 0≦a<1, 0

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