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Optical thin film, semiconductor light emitting device having the same and methods of fabricating the same

  • US 7,483,212 B2
  • Filed: 01/25/2007
  • Issued: 01/27/2009
  • Est. Priority Date: 10/11/2006
  • Status: Active Grant
First Claim
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1. An optical thin film comprising:

  • a first material layer having a first refractive index;

    a second material layer on the first material layer and having a second refractive index that is smaller than the first refractive index; and

    a graded-refractive index layer between the first material layer and the second material layer and having a multi-layer structure in which a refractive index distribution gradually decreases in a range between the first refractive index and the second refractive index as the refractive index distribution progresses from the first material layer toward the second material layer,wherein the second material layer and the graded-refractive index layer are formed of a porous structure having micro-porosity, and the micro-porosity includes a nano-air pore.

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