CONCEPT: Light-emitting diode (LED): - The device which is used to produce the different intensity of light and different color depending upon the types of mater used in making it is called LED. - A semiconductor light source that emits light when electric current flows through it is called LED. - When the electric current passed through the LED then the electrons in the diode recombine with the holes present in the diode and hence emits the light. - It can operate in forwarding bias only. EXPLANATION: - The full form of LED is Light Emitting Diode. Therefore option 3 is correct. - The LED has similar characteristics as that of a p-n junction diode. - The LED can emit a colored light also after doping.
