ILLUMINATION SYSTEM COMPRISING A RADIATION SOURCE AND A FLUORESCENT MATERIAL

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The invention concerns an illumination system for generation of colored, especially amber or red light, 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 amber to red emitting a rare earth metal- activated oxonitridoalumosilicate of general formula (Ca1-x-y-zSrxBayMgz)1-n(Al1-a+bBa)Si1-bN3-bOb : REn, wherein 0 ≤ x ≤ l, 0 ≤ y ≤ l, 0 ≤ z ≤ l, 0 ≤ a ≤ l , 0 < b ≤ land 0.002 ≤ n ≤ 0.2 and RE is selected from europium(II) and cerium(III). The invention is also concerned with a amber or red-emitting a rare earth metal-activated oxonitridoalumosilicate of general formula (Ca1-x-y-zSrxBayMgz)1-n( Al1-a+bBa)Si1-bN3-bOb : REn, wherein 0 ≤ x ≤ l, 0 ≤ y ≤ l, 0 ≤ z ≤ l, 0 ≤ a ≤ l, 0 ≤ b ≤ land 0.002 ≤ n ≤ 0.2 and RE is selected from europium(II) and cerium(III).