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Light emitting device having a patterned substrate and the method thereof

  • US 7,825,577 B2
  • Filed: 07/30/2007
  • Issued: 11/02/2010
  • Est. Priority Date: 07/28/2006
  • Status: Active Grant
First Claim
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1. A light-emitting device, comprisinga patterned substrate having an uneven surface composed of a plurality of depressions and/or extrusions;

  • a light-emitting stack overlaying the patterned substrate, comprising a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer,wherein at least one of the plurality of depressions and/or extrusions comprises a top portion, a bottom portion, and a sidewall portion, and at least part of the sidewall portion comprises a curve, andwherein said top portion is substantially parallel to said bottom portion and includes a rough surface.

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