Light emitting device with oxynitride phosphors

摘要

A light emitting device according to embodiments includes a light emitting element emitting light with a peak wavelength of 420˜445 nm, a first phosphor emitting light with a peak wavelength of 485˜530 nm, a second phosphor emitting light with a peak wavelength of 530˜580 nm, and a third phosphor emitting light with a peak wavelength of 600˜650 nm. The device emits light having an emission spectrum that has a local minimum value of light intensity between a wavelength of 450˜470 nm or less, the local minimum value being 60% or less of a maximum value of light intensity at a longer wavelength side from the local minimum value, and the device emits light having a color temperature of 4600 K or higher and 5400 K or less.

主权项

1. A light emitting device comprising:
a light emitting element emitting light with a peak wavelength of 420 nm or more and 445 nm or less; a first phosphor emitting light with a peak wavelength of 485 nm or more and less than 530 nm; a second phosphor emitting light with a peak wavelength of 530 nm or more and less than 580 nm; and a third phosphor emitting light with a peak wavelength of 600 nm or more and less than 650 nm, wherein the device emits light having an emission spectrum that has a local minimum value of light intensity between in the range of a wavelength of 450 nm or more and 470 nm or less, the local minimum value being 60% or less of a maximum value of light intensity at a longer wavelength side from the local minimum value, the device emits light having a color temperature of 4600 K or higher and 5400 K or less, and the first and second phosphors are oxynitride phosphors including silicon (Si), aluminum (Al) and strontium (Sr).