ILLUMINATION SYSTEM COMPRISING A RADIATION SOURCE AND A LUMINESCENT MATERIAL

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An illumination system comprising a radiation source and a luminescent material comprising at least one phosphor capable of absorbing a part 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 an amber to red-emitting cerium(III)-activated oxonitrido aluminate silicate of the general formula RE3-xAl2Al3-y- SiyO12-yNy : Cex, wherein RE is a rare earth metal, selected from the group of yttrium, gadolinium, lutetium, terbium, scandium and lanthanum, and 0.002 ≤ x ≤ 0.2 and 0 < y ≤ 3, can provide light sources having high luminosity and a high color-rendering index, especially in conjunction with a light emitting diode as a radiation source. The amber to red-emitting cerium(III)-activated oxonitrido aluminate silicate of the general formula RE3-xAl2Al3-ySiyO12-yNy : Cex, wherein RE is a rare earth metal, selected from the group of yttrium, gadolinium, lutetium, terbium, scandium and lanthanum, and 0.002 ≤ x ≤ 0.2 and 0 < y ≤ 3 is efficiently excitable by primary radiation in the near UV-to-blue range of the electromagnetic spectrum.