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COMEDK2022PhysicsSemiconductors

Choose the incorrect statements.

Options

  1. ASilicon is used in the fabrication of LED.
  2. BLED works on the principle of electróluminescence.
  3. CLED is a power efficient device.
  4. DLED is fabricated with direct band gap semiconductor.

Correct answer

A. Silicon is used in the fabrication of LED.

Step-by-step solution

LEDs are fabricated using direct band gap semiconductors such as Gallium Arsenide (GaAs) or Gallium Phosphide (GaP) because they allow for efficient radiative recombination of electrons and holes. Silicon is an indirect band gap semiconductor, which makes it highly inefficient for light emission, and therefore it is not used in the fabrication of LEDs. LEDs operate on the principle of electroluminescence, where electrical energy is converted directly into light energy through the recombination of charge carriers in

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