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External light efficiency of light emitting diodes

  • US 8,395,167 B2
  • Filed: 08/16/2007
  • Issued: 03/12/2013
  • Est. Priority Date: 08/16/2006
  • Status: Active Grant
First Claim
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1. A method to improve the external light efficiency of a light emitting diode, the light emitting diode including an n-type layer, a p-type layer, an ohmic contact layer, and a contact layer, the method comprising:

  • etching an external surface of the n-type layer to form surface texturing, the surface texturing reducing internal light reflection to increase light output,wherein the surface texturing is at least one selected from the group consisting of;

    micro-lenses and surface roughened micro-lenses, andwherein the surface texturing is over a part of the external surface of the n-type layer and is in light spaces formed between joining portions and an outer portion of a current dissipation array on the external surface of the n-type layer.

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