LED is a

CONCEPT:

An LED is a heavily doped P-N junction diode which under forward biased condition emits spontaneous radiations and the wavelength of these radiations falls under wavelength in the visible spectrum.

EXPLANATION:

• When the electric current passed through the LED then the electrons recombine with the holes present in the diode and hence LED emits the light.
• The amount of light emitted will depend on the rate of doping, the diode allows the flow of current only when it is forward biased 
• Hence, the LED has to be forward biased and heavily doped. 

Additional Information

• Longer life than other electrical light equipment 
• Emits monochromatic light
• Environment friendly