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In photoelectric effect, a suitable frequency of photon falls on electron in atom and ejects the electron. In LED when electron-hole recombination takes place a photon emits. How do you see these two phenomenon?
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In photoelectric effect, a suitable frequency of photon falls on elect...
Photoelectric Effect:

  • The photoelectric effect is the phenomenon of electrons being emitted from a material when exposed to light of sufficient energy.

  • A photon of suitable frequency is absorbed by an electron in an atom, which provides enough energy to the electron to overcome the binding energy of the atom and escape from the material.

  • The ejected electrons are called photoelectrons. The energy of the photoelectrons is equal to the energy of the incident photon minus the binding energy of the atom.

  • The photoelectric effect is used in various applications, including photovoltaic cells and photoelectric sensors.



LED:

  • An LED (light-emitting diode) is a semiconductor device that emits light when a current is passed through it.

  • When a forward voltage is applied to the LED, electrons from the N-type region and holes from the P-type region are injected into the depletion region.

  • As the electrons and holes move towards the junction, they recombine with each other, releasing energy in the form of photons.

  • The energy of the photons is determined by the bandgap energy of the semiconductor material used to make the LED.

  • The color of the emitted light is determined by the bandgap energy of the semiconductor material, with shorter wavelengths (higher energy) emitting blue light and longer wavelengths (lower energy) emitting red light.

  • LEDs are commonly used in lighting applications, displays, and indicators.

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In photoelectric effect, a suitable frequency of photon falls on electron in atom and ejects the electron. In LED when electron-hole recombination takes place a photon emits. How do you see these two phenomenon?
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