1. atulyaasokan

    Thread Starter New Member

    Mar 29, 2009
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    why si is not used in the manufacture of leds?
     
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Visible light isn't emitted. Different semiconductors and dopings are used for the different colors.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Actually they used to be, unless I'm mistaken, but better materials were found. The older LEDs were a lot less efficient, and dropped around 1.5V (for red).

    If you're interested someone pointed an interesting site I bookmarked, LED Museum.
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Silicon is an indirect bandgap semiconductor material and to emitt light both the proper energy and moment have to be given to an electron at the same time. This does not happen very often and thus silicon is inefficient for LEDs.

    Have a look here:

    http://en.wikipedia.org/wiki/Direct_bandgap
     
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