As different
materials, the polar body electronics, electric hole can be occupied by
first-order difference between high and low-order difference can be
called the energy gap, affecting the energy of photons combination
issued by different wavelengths of light, so the eye will see different
colors light, such as: red, orange, yellow, green, blue or visible
light, and so on. Therefore, LED is a long-lasting light source is to
convert light energy directly to the semiconductor device. The same
wavelength of a semiconductor material are very close, so each one LED
light color is very pure, with traditional light sources are mixed with
a variety of colors in comparison, LED can be regarded as a kind of
digital light source, the traditional incandescent light bulbs are heat
light, while the LED is part of cold light.
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