Why does the LED structure favorizes p-type semiconductor?

  • Thread starter Buiosu
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Why does the LED structure "favorizes" p-type semiconductor?

Hi all,

At first I apologize if my English makes this post harder to understand ;).

I am trying to figure out why there is always P-type semiconductor flashing outside in LEDs, both planar and edge ones - P-type region is the active region, why not N-type sometimes?
Radiative recombination occurs within the area that overlaps both semiconductors - why then p-type is better to be exposed?

I am thinking if it has something to do with direct/indirect band gap or maybe quantum efficiency of p/n semiconductors - but if there is any n-type semiconductor with direct band gap then I'm wrong.

Regards.
 

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