Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

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

  4. Apr 29, 2010 #3
    Thank you very much
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook