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Homework Help: Band Gap for Semiconductor

  1. Aug 24, 2007 #1
    Question: A light-emitting diode (LED) made of the semiconductor GaAsP gives off red light [tex] \lambda [/tex]=650nm. what is the band gap for this semiconductor?

    I know the E=hc/[tex] \lambda [/tex]

    so it means the band gap is 1240/650=1.9 ev ??
  2. jcsd
  3. Aug 24, 2007 #2


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    Sounds right - you can adjust the bandgap of GaAsP to tune the wavelength but that's in the right range.
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