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Why not indirect band gap for led

  1. Apr 28, 2010 #1
    Hey I was studying for my test, in my notes it says si cannot be used for led, because it has indirect band gap.Why indrect band gap is not useful for led?
     
  2. jcsd
  3. Apr 29, 2010 #2

    ZapperZ

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    It is a less efficient. It requires not only the available states, but the available phonons to provide the necessary change in momentum.

    Zz.
     
  4. Apr 29, 2010 #3
    Thank you very much
     
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