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Light emitting diode

  • US 8,754,438 B2
  • Filed: 02/19/2012
  • Issued: 06/17/2014
  • Est. Priority Date: 06/30/2011
  • Status: Expired due to Fees
First Claim
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1. An LED, comprising:

  • a substrate, having a top face and a bottom face;

    a buffer layer, disposed on the top face of the substrate;

    an epitaxial layer, disposed on the buffer layer, comprising;

    a first N-type epitaxial layer and a second N-type epitaxial layer;

    a blocking layer, having patterned grooves, sandwiched between the first and the second N-type epitaxial layers, wherein the first and the second N-type epitaxial layers contacts to each other via a portion of the second N-type epitaxial layer in the patterned grooves;

    a light emitting layer, disposed on the second N-type epitaxial layer; and

    a P-type epitaxial layer, disposed on the light emitting layer;

    a conductive layer, disposed on the P-type epitaxial layer;

    a P-type electrode disposed on the conductive layer; and

    an N-type electrode disposed on the blocking layer opposite to the P-type electrode, wherein the N-type electrode is separated from the second N-type epitaxial layer and has a portion extending into the patterned grooves to contact with the first N-type epitaxial layer.

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