| 摘要 |
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 (RE<SUB>1-z</SUB>)<SUB>2-a</SUB>EA<SUB>a</SUB>Si<SUB>4</SUB>N<SUB>6+a</SUB>C<SUB>1-a</SUB>:Ce<SUB>Z</SUB>, 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 (RE<SUB>1-z</SUB>)<SUB>2-a</SUB>EA<SUB>a</SUB>Si<SUB>4</SUB>N<SUB>6+a</SUB>C<SUB>1-a</SUB>:Ce<SUB>z </SUB>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.
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