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Silicon and Germanium are not used to make LEDs.

  1. They are opaque to visible light
  2. They have the wrong type of band gap (direct instead of indirect).

LEDs are made with binary semiconductors, like:

  • Indium Gallium Nitride
  • Silicon Carbide
  • Indium Phosphide
  • Gallium Indium Arsenide Nitride
  • Indium Gallium Aluminum Phosphide
  • etc.
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12y ago

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