Patent ID: 8053970

Claim:
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: a first fluorescent material that emits a blue-green light or a green light, a second fluorescent material that has a light emitting peak wavelength longer than that of said first fluorescent material and emits a green light or a yellow-green light, a third fluorescent material that has a light emitting peak wavelength longer than that of said second fluorescent material and emits a yellow-green light, a yellow light or a yellow-red light, a fourth fluorescent material that has a light emitting peak wavelength longer than that of said third fluorescent material and emits a yellow-red light or a red light, 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 x(1−r) Si y O z N (2x+4y−2z)/3 :Eu xr , 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 3 , wherein said α-SiAlON fluorescent material is represented by a general formula Ca q Eu r (Si,Al) 12 (O,N) 16 , in which a main phase has an α-SiAlON crystal structure, q is not less than 0.75 and not more than 1.0, and r is not less than 0.03 and not more than 0.10, wherein said β-SiAlON fluorescent material is represented by a general formula Eu s (Si,Al) 6−s (O,N) 8 , in which a main phase has a β-SiAlON crystal structure, and s is not less than 0.011 and not more than 0.019, and wherein for said oxynitride crystal fluorescent material represented by said general formula Ba x(1−r) Si y O z N (2x+4y−2z)/3 :Eu xr , x is not less than 0.8 and not more than 1.2, y is not less than 1.6 and not more than 2.4, z is not less than 1.6 and not more than 2.4, and r is not less than 0.015 and not more than 0.10.