Patent ID: 9705051
Date: 2017-07-11
CPC Classifications: H01L

Claim:
1. A light emitting device, comprising: an epitaxial structure; a sheet-shaped wavelength converting layer, disposed on the epitaxial structure and at least comprising a first wavelength converting unit layer and a second wavelength converting unit layer, wherein the first wavelength converting unit layer is located between the second wavelength converting unit layer and the epitaxial structure, an emission peak wavelength of the first wavelength converting unit layer is greater than an emission peak wavelength of the second wavelength converting unit layer, and a full width half magnitude of the second wavelength converting unit layer is greater than a full width half magnitude of the first wavelength converting unit layer, wherein the first wavelength converting unit layer comprises a wavelength converting substance and a gel, the first wavelength converting unit layer is calculated based on total percentage of 100% of composition, the wavelength converting substance has a percentage by weight in a range from 60% to 95%, and a thickness of the first wavelength converting unit layer is in a range from 1.2 times to 3 times of a mean particle diameter of the wavelength converting substance; and an adhesive layer, disposed between the first wavelength converting unit layer and the second wavelength converting unit layer.