 |
|
|
About LED and solar cells Light Emitting Diodes are very similar to solar cells. Both devices use n-type and p-type crystals, but in a solar cell the process runs backwards: instead of coming down in energy level and emitting light, the light hits the solar cells causing the electrons in the p-type crystal to leap upwards in energy. Now, if these electrons are anywhere near the crystal junction, they can find themselves in the n-type crystal, and they can flow through wires to the outside world, falling down in energy level as they will. In fact, if light gleams on an LED, the LED behaves as a small, inefficient solar cell. On the contrary, if a battery is used to make a current in a solar cell, the solar cell can vary well emit a tiny amount of (mostly infrared) light.
An LED gives off light when a charge is pumped through it, and also when
light flashes on a solar cell, the solar cell becomes a super-charged
pump.
Resources : led guide | led reference | led sites | led recommend | led source
Copyright Germains Led lights.com. All
rights Reserved world wide. |