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Efficieny of an LED

  1. Jul 14, 2012 #1
    Greetings everyone,

    I need to calculate the efficiency of an LED without a plastic dome, thus total internal reflection is a limiting factor in this case. The book asks me to show that TIR at the interface with air reduces the emission efficiency by the factor 1-cosθ where θ is the critic angle. In addition to that how can I calculate the solid angle of a cone with half angle say β. Any help is appreciated.

  2. jcsd
  3. Jul 14, 2012 #2


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  4. Jul 15, 2012 #3
    Thanks for your help, I was able to figure it out.
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