Light Emitting Diode
by Kanishka on Jan.18, 2009, under Tutorials and Articles
Commonly known as LED(Light Emitting Diode), it is actually a p-n junction diode which is capable of emitting light. A LED operates like a regular p-n junction diode.
Diodes have to be forward biased for current transfer.
What makes a LED different from a regular diode is the semiconductor material which is used to form the p-n junction regular diodes which are generally made of semiconductor materials like Silicon or Germanium; whereas LEDs are made of materials like Gallium arsenide (GaAs) compounds and Indium(III) phosphide (InP) compounds.
In a regular diode, when current flows, energy is thrown off in form of heat. In light emitting diode, an electric current passing through the diode causes the light in the visible portion of the electromagnetic spectrum to be emitted.
LEDs can emit lights of different colors. The color of the light emitted usually depends on the semiconductor material used to fabricate the p-n junction in the diode. For example, Gallium arsenide phosphide (GaAsP) is used to make LED that emit red light and Indium gallium nitride (InGaN) for blue LED.
You would have seen several electrical devices that use LED. Using LEDs to provide visual indication in displays is very common. Some times many LEDs are packaged together to form numeric display. You even would have seen these displays on your microwaves or your washing machines for setting timers.
As LED of the higher power is developed and optics for LED evolves, LEDs are being used increasingly to replace incandescent lamps and area lighting. They are used for the UV-based water purification system as well.
I hope the article was informative. Please do comment and let me know.
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March 20th, 2009 on 9:49 am
Very interesting information and good pictures!
March 30th, 2010 on 7:38 pm
My name is Piter Jankovich. oOnly want to tell, that your blog is really cool
And want to ask you: is this blog your hobby?
P.S. Sorry for my bad english
April 13th, 2010 on 1:45 am
Hello, I found this by accident while doing some research on a different topic. As is the case for me. I found your posts informative which is highly refreshing. Keep up the great work.
October 4th, 2010 on 8:08 pm
the great thing about LED light is that they do not generate lots of heat.~-
January 29th, 2011 on 2:44 pm
this cleared my concept of LED…..
February 21st, 2011 on 7:55 pm
i actually was searchin for explanation of led’s. Coz i’ve seminar on this topic. This article was really helpful for me. Thank’s
February 22nd, 2011 on 1:02 pm
I like thz information n amazing picture.me want more information i like n wnt 2 improve my engengring of electronics.thnks n sori dear’s my english iz much bad.
June 14th, 2011 on 4:54 pm
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