indirect band gap semiconductor doubt ....

Discussion in 'General Electronics Chat' started by munna007, Sep 18, 2010.

  1. munna007

    Thread Starter Active Member

    Jul 23, 2008
    51
    0
    its said that indirect band gap semiconductors like silicon and germanium are not used as a light sources because they have more non-radiative recombinations rather than radiative ,which inturn decreases efficiency of optical source.


    but i want to understand how indirect band gap materials produce non-radiative photons.

    i have studied many books like keiser , senior on optical fibre .those all are not explanatory on this ....also googled for this ,but not helped from there.....


    hoping for help here....thanks.....love to all....
     
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