LED element
US9634188B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2014 |
| Grant date | Apr 25, 2017 |
| Priority date | — |
| Expiry date | May 19, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/872
Abstract
In order to achieve appropriate light distribution using light distribution characteristics resulting from diffraction while improving light extraction efficiency using a diffraction effect, an LED element provided with: a substrate in which periodic depressions or projections are formed on a front surface; a semiconductor laminated part that is formed on the front surface of the sapphire substrate, includes a light-emitting layer, and is formed of a group-III nitride semiconductor; and a reflecting part that reflects at least a part of light emitted from the light-emitting layer toward the front surface of the substrate, the LED element obtaining a diffraction effect of light emitted from the light-emitting layer at an interface between the substrate and the semiconductor laminated part, wherein a relation of 1/2×λ≦P≦16/9×λ is satisfied, where a period of the depressions or the projections is P and a peak wavelength of the light emitted from the light-emitting layer is λ.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.