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

  • US 20040041164A1
  • Filed: 09/17/2003
  • Published: 03/04/2004
  • Est. Priority Date: 12/03/1999
  • Status: Active Grant
First Claim
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1. A light emitting diode (LED) with enhanced light extraction structures, comprising:

  • an LED structure having;

    an epitaxially grown p-type layer;

    an epitaxially grown n-type layer; and

    an epitaxially grown active layer between said p-type and n-type layers;

    a first spreader layer adjacent to said LED structure;

    a second spreader layer adjacent to said LED structure, opposite said first spreader layer; and

    light extraction structures disposed integral with said LED, said light extraction structures providing surfaces to allow light trapped within said LED to disperse, reflect and/or refract out of said LED.

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