Patent ID: 7615797

Claim:
A light-emitting device comprising a light-emitting element and a phosphor layer comprising a red phosphor and a green phosphor, output light containing a red light-emitting component emitted by the red phosphor, a green light-emitting component emitted by the green phosphor, and a light-emitting component emitted by the light-emitting element, wherein the output light is white light, the red phosphor is a nitridoaluminosilicate-based nitride phosphor that is activated with Eu 2+ and excited with light emitted by the light-emitting element, and has an emission peak in a wavelength range of 600 nm to less than 660 nm, the green phosphor is activated either with Eu 2+ or with Ce 3+ and excited with light emitted by the light-emitting element, and has an emission peak in a wavelength range of 500 nm to less than 560 nm, the light-emitting element is a blue light-emitting element that emits light having an emission peak in a wavelength range of 440 nm to less than 500 nm, all phosphors contained in the phosphor layer are either phosphors activated with Eu 2+ or phosphors activated with Ce 3+ , the red phosphor has an internal quantum efficiency of at least 80% under the excitation of light emitted by the blue light-emitting element, an excitation spectrum of all the phosphors contained in the phosphor layer has an excitation peak in a wavelength range shorter than a wavelength of the emission peak of light emitted by the blue light-emitting element, and the phosphor layer does not substantially contain an inorganic phosphor other than a nitride phosphor or an oxynitride phosphor.