Phosphor composition and method for producing the same, and light-emitting device using the same

A light-emitting device comprising:

• a phosphor layer having a red phosphor and a green phosphor,
• the red phosphor being activated by Eu2+ 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 Eu2+ 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 (M1-xEux)AlSiN3 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)2SiO4:
• Eu2+ and its internal quantum efficiency is at least 85% in a wavelength range from at least 440 nm to less than 500 nm.