Patent ID: 7938983
Filing Date: 2011-05-10
Classification: C04B,C09K,H01L,H05B,Y02B

Abstract:
1. A 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 rare earth metal-activated oxonitridoalumosilicate of general formula (Ca 1−x−y−z Sr x Ba y Mg z ) 1−n (Al 1−a+b B a )Si 1−b N 3−b O b :RE n , wherein 0≦x≦1, 0≦y≦1, 0≦z≦1, 0≦a≦1, 0<b≦1 and 0.002≦n≦0.2 and RE is selected from europium(II) and cerium(III).