Light emitting apparatus using medium layer between wavelength conversion layer and transparent layer

摘要

A light emitting apparatus includes a first light source to generate light having a first main wavelength band, a second light source to generate light having a second main wavelength band, a first transparent layer surrounding the first and second light sources, a wavelength conversion layer disposed on the first transparent layer to convert at least one of the light having the first main wavelength band and the light having the second main wavelength band into light having a third main wavelength band, and a medium layer between the wavelength conversion layer and the first transparent layer. At least of the first or second light sources has a first refractive index, the first transparent layer has a second refractive index, the medium layer has a third refractive index, the wavelength conversion layer has a fourth refractive index, and the first to fourth refractive indexes are different from each other.

主权项

1. A light emitting apparatus comprising:
a sub-mount; a first light source on the sub-mount to generate a light having a first main wavelength band in a range of about 400 nm to about 500 nm; a second light source on the sub-mount to generate a light having a second main wavelength band in a range of about 600 nm to about 670 nm, the second light spaced apart from the first light source; a first transparent layer surrounding the first and second light sources; a wavelength conversion layer on the first transparent layer to convert at least one of the light having the first main wavelength band or the light having the second main wavelength band into a light having a third main wavelength band in a range of about 500 nm to about 600 nm; a diffusion layer on the sub-mount; and a medium layer between the wavelength conversion layer and the first transparent layer, wherein at least one of the first or second light sources has a first refractive index, the first transparent layer has a second refractive index, the medium layer has a third refractive index, and the wavelength conversion layer has a fourth refractive index, wherein the first to fourth refractive indexes are different from each other, wherein a lower surface of the first transparent layer and an edge of the medium layer contact a top surface of the diffusion layer, wherein an outside portion of the diffusion layer contacts an inside portion of the wavelength conversion layer, and wherein the medium layer has a width in range of 0.5 mm to 50 mm.