Light-emitting device having a patterned substrate and the method thereof
US9780259B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2016 |
| Grant date | Oct 3, 2017 |
| Priority date | — |
| Expiry date | Jan 4, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/825
Abstract
A light-emitting device comprises a textured substrate comprising a plurality of textured structures, wherein the textured structures and the textured substrate are both composed of sapphire; and a light-emitting stack overlaying the textured substrate, comprising a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer, wherein each of the plurality of textured structures comprises a top portion having a first top-view shape, and a bottom portion parallel to the top portion and having a second top-view shape, wherein the first top-view shape comprises a circle or an ellipse, the first top-view shape comprises a first periphery and the second top-view shape comprises a second periphery, the first periphery is enclosed by the second periphery, and various distances are between each of the first periphery and the second periphery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.