LED LIGHT EMITTING DIODE IS INTRODUCED IN 1962.IT IS A PRACTICAL ELECTRONIC COMPONENT. IN EARLY DAYS IT IS A ONLY LOW DENSITY RED LIGHT IS USED.BUT IN MODERN VERSION USING VISIBLE,ULTRAVIOLET AND INFRARED HIGH WAVELENGTHS,WITH HIGH BRIGHTNESS.LED IS A SEMICONDUCTOR LIGHT SOURCE.WHEN LED IS FORWARD BIASED IT IS SWITCHED ON AND ELECTRONS ARE RECOMBINE WITH HOLES AND PRODUCE IN THE FORM OF PHOTONS THIS EFFECT IS CALLED AS ELECTROLUMINESCENCE.THE COLOR OF LED DEPEND ON THE ENERGY OF THE PHOTON (I.E) ENERGY GAP OF SEMICONDUCTOR.
*IT HAS MORE LIFE TIME
*IT IS RELIABLE
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