What is the Light Emitting Diode(L.E.D.) ?

Light Emitting Diode(L.E.D.) :-

Light emitting diode is a special diodes, when forward biased; they emit light of particular colour. LEDs heavily doped pn junctions diodes. The colour of light emitted is depends upon band gap of material used in manufacturing of LEDs.

           

• ü Advantages of LEDs :-
•       i.            LEDs are chip.
•   ii.            LEDs requires low operating voltages and low power.
• iii.            They have longer life and light weight.
• iv.            They have high operating speed.
•    v.            Different spectral colour outputs are possible.
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• ü Uses of LEDs. :-
•       i.            LEDs are used as status indicator on various instruments.
•   ii.            Used in advertising boards, rolling displays in offices, banks, railways stations, airports, etc.
• iii.             LEDs are used in traffic control system.
• iv.             LEDs are used in optical fiber communication as light           source.
•    v.            They are used as brake indicator in bikes and vehicles.
• vi.            Used in Seven-Segment Display Unit, which is used to display output of various instruments in decimal digit format.