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Light-emitting devices with high extraction efficiency

  • US 20070029560A1
  • Filed: 10/28/2005
  • Published: 02/08/2007
  • Est. Priority Date: 08/04/2005
  • Status: Abandoned Application
First Claim
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1. A light-emitting device, comprising:

  • a light-emitting portion, including;

    a substrate which is optically transparent;

    a light-emitting layer which is sandwiched by a p-type cladding layer and an n-type cladding layer and is optically transparent;

    said p-type cladding layer which locates on one side of said light-emitting layer and is optically transparent;

    said n-type cladding layer which locates on the other side of said light-emitting layer and is optically transparent;

    a p-type electrode layer located on said p-type cladding layer; and

    an n-type electrode layer located on said n-type cladding layer, characterized in that said light-emitting device comprising;

    a light control portion, comprising;

    a light-tunneling layer which is disposed on a light-exiting surface of said light-emitting device and has a refractive index lower than refractive indices of said substrate, said cladding layers and said electrode layers to the wavelength of the major emitted light emitted by said light-emitting layer and has a thickness smaller than the wavelength of the major emitted light.

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