| 摘要 |
A light-emitting device is disclosed, 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 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 440 nm to less than 500 nm, the red phosphor and the green phosphor emitting light being excited by luminenscence of the blue-light-emitting element, output light of the light-emitting device at least containing a light-emitting component of luminenscence from the blue-light-emitting element and a light-emitting component of luminenscence 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, Ba, and Zn, and satisfies 0.005‰ x‰ 0.3, 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 the wavelength range from at least 440 nm to less than 500 nm. |
