Light Emitting Diode:



An LED is a semiconductor p-n junction diode which converts electrical energy to light energy under forward biasing. It emits light in both visible and IR region.

Theory:

    It is known that only the direct band gap semiconductors emit light in the p-n junction. We know the forbidden band gap energy is given by.




Therefore, the wavelength of the light emitted purely depends on the band gap energy express in electron volts.

Types of LED’s:

    There are two types of LED’s

    Planer LED.

    Dome shaped LED.


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