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Light from a Light Emitting Diode (LED) is created in much the same way
that light is created in a flourescent tube or neon sign. In an LED
crystal the electrons of its atoms are pumped up to higher energy states,
and when they fall back down again, each atom gives off a particle/wave of
light. However, the electrons in an LED are not exactly the same as the
gas molecules in a neon sign. They are not in orbitals stuck to
individual atoms. Instead the electrons occupy a contiguous "sea of
charge," and they continually wander among all the atoms in the material.
But while they do this, they maintain a particular energy level just like
they do when stuck to individual atoms. It's as if each electron in an
LED crystal was "orbiting" among all the atoms of the substance as a
whole, and the electron always "orbits" at a particular "height" above
each of the atoms it passes.

Be aware that *all* substances contain components - electrons. The electrons I'm
discussing here are not supplied by the battery, they instead occur
naturally in the wires, crystals, etc. They are in the LED all the time,
even when the battery is not connected. Don't make my original mistake by
imagining that electrons are injected into the LED by the power supply.
In fact, they are already in the material, and the power supply simply
forces them to flow.

To create LED light, first we connect two conductive crystals of different
characteristics together. Both types of crystal contain movable
electrons. In one type of crystal the electrons "orbit" naturally at a
high energy level, and in the other, they always "orbit" low. When a
voltage is applied across the joined crystals, the electrons inside are
forced to flow across the boundary between the pair of electronic components. If the
flow direction is correct, electrons in the "high" crystal flow into the
"low" crystal and must begin orbiting at the lower energy level. As they
fall to the lower energy level, they give off light. The frequency of the
light (which we see as the color) is determined by the difference in
energy levels between the two crystals. By manufacturing different types of electronic components
of crystals having different natural energy levels, various colors of
light can be created. Crystals with similar levels create low-energy electronic component.
And, of cource, photons of red light or even infrared light. With a larger difference in
energy levels, green light can be created. An even larger energy-step can
create blue light.