Question

Choose the incorrect statements.

• A. Silicon is used in the fabrication of LED.
• B. LED works on the principle of electroluminescence.
• C. LED is a power efficient device.
• D. LED is fabricated with direct band gap semiconductor.

Hint:

Always remember that LEDs require direct band gap materials to efficiently emit light.

Answer 1

The Correct Option is A

Silicon is an indirect band gap semiconductor, and hence not suitable for LED fabrication. LEDs are fabricated using direct band gap semiconductors like Gallium Arsenide (GaAs) or Gallium Phosphide (GaP), which allow efficient photon emission.
Electroluminescence is the principle on which LEDs work, and they are known for being energy-efficient.