Patent ID: 8053970
Filing Date: 2011-11-08
Classification: C09K,H01L,Y02B

Abstract:
1. A light emitting device comprising: a semiconductor light emitting element that emits light having a central wavelength of 445-480 nm, and a fluorescent material that absorbs at least some of said light emitted from said semiconductor light emitting element and emits a fluorescent light of a wavelength different from said light, wherein said fluorescent material is a mixed fluorescent material obtained by mixing: wherein colors of the light emitted from the semiconductor light emitting element and the fluorescent light emitted from the mixed fluorescent material are mixed wherein said first fluorescent material is an oxynitride crystal fluorescent material represented by a general formula Ba wherein said second fluorescent material is a europium-activated β-SiAlON fluorescent material, wherein said third fluorescent material is a europium-activated α-SiAlON fluorescent material, wherein said fourth fluorescent material is a nitride crystal red fluorescent material represented by a general formula (Ca,Eu)AlSiN wherein said α-SiAlON fluorescent material is represented by a general formula Ca wherein said β-SiAlON fluorescent material is represented by a general formula Eu wherein for said oxynitride crystal fluorescent material represented by said general formula Ba