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Homework Help: Silicon in LEDs

  1. Sep 14, 2009 #1
    Why don't silicon diodes emit light?
    No idea. However, I do know that gallium arsenide is used as a semiconductor in LEDs.
  2. jcsd
  3. Sep 14, 2009 #2


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    They do - it's a big problem building astronomical cameras, every time you clock a pixel you get some light.

    It's not very efficent though compared to GaAS
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