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Optoelectronics, Optics, Lights and Lasers > Non-Coherent Light Sources > Electroluminescent Lamps > 

How do "Light Emitting Diodes" work?

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Author Topic: How do "Light Emitting Diodes" work?  (Read 1102 times)
Mehmaiz_Ali
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« on: May 15, 2011, 02:45:10 PM »
What're the "Light Emitting Diodes", how do the work & how much electricity do they use??? (Explain in your own words, don't give website links, thanks!) .X
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Roger
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« Reply #1 on: May 15, 2011, 02:53:03 PM »
The light emitting diodes have a PN junction, the free electrons from the N doped semiconductor combine with the  "holes' from the P type material at the junction. The recombination emits photons.
A typical LED uses 10 to 20 milliamperes with a voltage of about 2 volts (20 to 40 milliwatts). There are also higher power LED's being used in car headlights and other places.
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JWTeeset
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« Reply #2 on: May 15, 2011, 03:00:40 PM »
Led's are a particular diode "doped" with particular elements that emits light when current flows.

See links below for more info.
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