Patent ID: 7391060

Claim:
A light-emitting device comprising: a phosphor layer having a red phosphor and a green phosphor, the red phosphor being activated by Eu 2+ and having an emission peak in a wavelength range from at least 600 nm to less than 660 nm and the green phosphor being activated only by Eu 2+ and having an emission peak in a wavelength range from at least 500 nm to less than 560 nm; and a blue light-emitting element having an emission peak in a wavelength range from at least 440 nm to less than 500 nm; the red phosphor and the green phosphor emitting light being excited by luminescence of the blue light-emitting element, and output light of the light-emitting device at least containing a light-emitting component of luminescence from the blue light-emitting element and a light-emitting component of luminescence from the red phosphor and the green phosphor, wherein the red phosphor has a composition formula (M 1-x Eu x )AlSiN 3 where M is at least one element selected from the group consisting of Mg, Ca, Sr and Ba, and satisfies 0.005≦x≦0.3, the phosphor layer includes substantially no sulfide phosphor, and only the red phosphor includes a nitride phosphor or an oxynitride phosphor, and the green phosphor is represented by a composition formula (Ba,Sr) 2 SiO 4 : Eu 2+ and its internal quantum efficiency is at least 85% in a wavelength range from at least 440 nm to less than 500 nm.