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Electronic Devices & CircuitsOptoelectronic Devices

An LED material must generally have a direct band gap for efficient light emission because?

  • AElectron-hole recombination can efficiently release energy as photons
  • BIt eliminates all junction current
  • CIt forces avalanche multiplication
  • DIt makes the device an ideal resistor
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Correct Answer: A. Electron-hole recombination can efficiently release energy as photons
Explanation: Direct-band-gap semiconductors allow efficient radiative electron-hole recombination without requiring a momentum-changing phonon.
Reference: Standard optoelectronics: LED materials
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