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

  • US 9,780,259 B2
  • Filed: 01/04/2016
  • Issued: 10/03/2017
  • Est. Priority Date: 07/28/2006
  • Status: Active Grant
First Claim
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1. A light-emitting device, comprising:

  • a textured substrate comprising a plurality of textured structures, wherein the plurality of 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, a bottom portion parallel to the top portion and having a second top-view shape different from the first top-view shape, and three symmetric planes connecting the top portion and the bottom portion,wherein 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 the first periphery and the second periphery.

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