led emission

Question

LED emits light when electrons recombine with holes releasing energy equal to:

RankGuru · Accepted Answer

Light Emitting Diodes (LEDs) are specially designed p-n junctions made from compound semiconductors (like GaAs or GaP).
- When forward biased, electrons are injected into the p-region and holes into the n-region.
- Charge carriers recombine near the junction. 
- In direct band gap materials, this recombination releases energy in the form of photons rather than heat.
- The energy of the emitted photon is approximately equal to the band gap energy $E_g$ of the material: $h
u \approx E_g$.
- The color of light depends on the band gap.

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LED emits light when?