J
John Popelish
- Jan 1, 1970
- 0
martin said:Hey Ive always wondered about the voltage as related to the colors of LED's.
Depending on the color of the Led you use a different Voltage.
But what I don't understand is why? Aren't all leds the same with just a
different resin or what ever plastic surrounding it to make the color. eg
RED, or GREEN resin. I don't understand why different colors require
different voltages.
Can anyone answer my question ??
Thanks.
It has to do with the energy per photon. Electrons gain energy by
falling through the voltage across the junction, and give that energy
up into a photon (if you are lucky). Blue photons have about twice as
much energy, each, as red ones do. The junction has to be designed to
produce the needed drop and also to be transparent to the photons
produced. Each color requires a different kind of junction material
and structure.