Question

LED works on which of the following principles ?
1. It works on the principle of electro luminance.
2. LED is designed to experience breakdown at a specified reverse bias voltage.
3. LED is basically like an ordinary PN-junction diode but normally operated in reverse biased condition.
4. When a photon of ample energy strikes the diode, it makes a couple of electron-holes

Answer 1

Correct Answer - Option 1 : It works on the principle of electro luminance.

The correct answer is Electro luminance.

• Light Emitting Diode (LED) work on the Principle of  Electro luminance. 
• Light Emitting Diode:
  • It is a semiconductor device.
  • They emit light when an electric current passes through them.
  • LED lights are ideal for numerous applications including night lighting, art lighting, and outdoor lighting.
• Electroluminescence:
  • It is the non-thermal conversion of electrical energy into light energy.
  • It is an optical process that leads to the generation of photons as a result of the radiative recombination of holes and electrons during the passage of an electric current through a material.
• LEDs work on the principle of Electroluminescence.
• On passing a current through the diode, minority charge carriers and majority charge carriers recombine at the junction. On recombination, energy is released in the form of photons.