LED element and method of manufacturing the same
US9793434B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2014 |
| Grant date | Oct 17, 2017 |
| Priority date | — |
| Expiry date | Apr 15, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/882
Abstract
An LED element capable of further improving the light extraction efficiency and its manufacturing method are provided.An LED element comprises a semiconductor lamination part that includes a light-emitting layer, a diffractive surface on which light emitted from the light-emitting layer is incident and on which projection parts are formed with a period larger than an optical wavelength of the light and smaller than a coherence length of the light and which reflects the incident light in a plurality of modes according to a Bragg diffraction condition and transmits the incident light in a plurality of modes according to the Bragg diffraction condition, and a reflecting surface that reflects light refracted by the diffractive surface so that the reflected light is incident on the diffractive surface again, wherein the semiconductor lamination part is formed on the diffractive surface without any void around the projection parts and a proportion of a flat part in the diffractive surface is 40% or more in a plan view thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.