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Enhanced light extraction in LEDs through the use of internal and external optical elements

  • US 6,821,804 B2
  • Filed: 09/17/2003
  • Issued: 11/23/2004
  • Est. Priority Date: 12/03/1999
  • Status: Expired due to Term
First Claim
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1. A method for growing a light emitting diode having an internal disperser layer to enhance light extraction, comprising:

  • placing a substrate in a reactor for growing semiconductor materials;

    growing a first semiconductor layer on said substrate, said first layer having a rough surface;

    stopping growth of said semiconductor layer;

    growing a disperser layer of semiconductor material on said roughened layer, said disperser layer having a different index of refraction than said first layer;

    growing a second layer on said disperser layer, said second layer having a similar index of refraction as said first layer; and

    growing a semiconductor light emitting structure on said second layer.

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