LIGHT EMITTING DIODE (LED), PRINCIPLE OF OPERATION
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February 18, 2016 |
5 Comments |
LIGHT EMITTING DIODE (LED)
An LED is a specially fabricated P-N junction
diode that emits monochromatic light when it is forward biased.
LED is invented 1st by “OLEG
LOSEV “in 1927.
First practical of visible spectrum (red) was
developed in 1962 by “NICK HOLONYAK”. so He is called the FATHER of LED.
In 1968 “Man Santo company” was the first
organization to mass produce visible LEDs using GaAsp .
The lifetime of LEDs are 25000 to 100000 hours.
But heat and current setting can extend or shorten this time.
The operation of LED is based upon the
phenomenon of
When a P-n junction is f/w biased then free
electrons cross the
N-region and recombine with holes existing in
p-region .
free
electrons are in C.b. (high energy level) while holes are in V.b.
( low energy level).
As these electrons fall from higher energy to
lower energy level recombine with holes
then these radiated energy in the form of heat and light
Led produces light while conducting
current through them so led are current
driven devices.
COLOR OF LED
The color of light emitting diode depends upon
various factors such as
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