Light-emitting device having a patterned substrate and the method thereof

US10038116B2 · kind B2 · utility

Assignee

• Epistar Corporation · TW

Inventors

• Ta-Cheng Hsu · Hsinchu, TW
• Ching-Shian Yeh · Hsinchu, TW
• Chao-Shun Huang · Hsinchu, TW
• Ying-Yong Su · Hsinchu, TW
• Ya-Lan Yang · Hsinchu, TW
• Ya-Ju Lee · Hsinchu, TW

Key dates

• Filing date: Aug 30, 2017
• Grant date: Jul 31, 2018
• Expiry date: Aug 30, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/825

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 one of the plurality of textured structures comprises a top portion and a bottom portion, wherein a first distance between a first projection of the top portion on the bottom portion and the bottom portion at one side is different from a second distance between a second projection of the top portion on the bottom portion and the bottom portion at another side.