The
fourth-generation automotive light sources are LED: LED is a
semiconductor PN junction diodes, when a forward bias when imposed on
the PN junction at both ends, so that PN junction system has been
stimulated, carrier transition from the low-energy state to a
high-energy state, when the in
the high-energy state of instability in the carrier back to low-energy
state complex, in accordance with the conservation of energy of the
original
Li, excess energy will be released as photons, it is the principle of LED electroluminescence. It is
not an object through the fever can heat up and glow, is a direct
conversion of light energy, emission wavelength depends on the energy
difference of carrier state and low energy states thatenergy
difference.
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