 |
|
|
Where the electrons get the energy ? What place did the electrons get the energy needed to emit light you might ask? And how do they get to a much higher energy state in order to enter into the n-type crystal? Lets see, for the battery to shove electrons through the LED, it had to have supplied an electrical attraction of forces to the electrons in the crystal. To apply a force of electrons to the crystal, it had to apply some sort of force to the electrons in the negative wire. This pinches all of the electrons on the bare surface of the negative wire together, which raises the voltage of the whole wire. (Take this as an example. If the electrons were like water, then the wire would be like a very long trough. The battery serves to pump water into one end of the trough and this makes the level of the water/voltage rise everywhere in the trough.) When the negative wire’s electrons get up to the energy level equaled to the n-type crystal, they begin to flow into the crystal and fall down so-to-speak emitting light as they go. (The analogy just given is however incomplete: at the same instance that the battery pumps up the “water level” of the negative wire to equal the n-type crystal level, it is also minimizing the “water level” of the positive wire so that the low-energy electrons of the p-type crystal could be sucked in the wire.)
Resources : led guide | led reference | led sites | led recommend | led source
Copyright Germains Led lights.com. All
rights Reserved world wide. |