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Consider the following sentences in respect of LEDs (Light emitting diodes) and semiconductor laser diode.
S1 :  Only direct band gap type semiconductors are suitable for fabrication of LEDs.
S2 : Both direct band gap type and indirect band gap type semiconductors are suitable for fabrication of semiconductor laser diode.
Choose the best alternative
  • a)
    S1 is TRUE, S2 is FALSE
  • b)
    S1 is FALSE, S2 is TRUE
  • c)
    Both S1, S2 are TRUE
  • d)
    Both S1, S2 are FALSE
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Consider the following sentences in respect of LEDs (Light emitting di...
For the fabrication of semiconductor laser diode, direct band gap type semiconductor is required
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Most Upvoted Answer
Consider the following sentences in respect of LEDs (Light emitting di...
Explanation:

S1: Only direct band gap type semiconductors are suitable for fabrication of LEDs
- LEDs require direct band gap semiconductors because direct band gap materials have a higher radiative recombination rate compared to indirect band gap materials.
- The high radiative recombination rate allows for efficient light emission, making direct band gap semiconductors like Gallium Arsenide (GaAs) and Gallium Nitride (GaN) suitable for LED fabrication.
- Therefore, S1 is TRUE.

S2: Both direct band gap type and indirect band gap type semiconductors are suitable for fabrication of semiconductor laser diode
- Semiconductor laser diodes can be fabricated using both direct and indirect band gap semiconductors.
- While direct band gap materials are more commonly used for laser diodes due to their higher efficiency, indirect band gap materials like Silicon (Si) can also be used with special techniques such as indirect band-to-band transitions or phonon-assisted transitions.
- Therefore, S2 is FALSE.
Therefore, the correct answer is option 'A': S1 is TRUE, and S2 is FALSE.
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Consider the following sentences in respect of LEDs (Light emitting diodes) and semiconductor laser diode.S1 : Only direct band gap type semiconductors are suitable for fabrication of LEDs.S2 : Both direct band gap type and indirect band gap type semiconductors are suitable for fabrication of semiconductor laser diode.Choose the best alternativea)S1 is TRUE, S2 is FALSEb)S1 is FALSE, S2 is TRUEc)Both S1, S2 are TRUEd)Both S1, S2 are FALSECorrect answer is option 'A'. Can you explain this answer?
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