When the voltage polarity, the hole has a tendency to diffuse to the moving blocks of n. P at the same time get back more electrons (negative charge) from the N block switch. The result is the P block (hole surplus and shortage of electrons) while the block N (missing according to the principle of operation of the LED, the nature does not emit white light are:There are two primary methods to create white light LED:The method of mixing the three primary colors (RGB) or seven color spectrum of light like the Sun to white light.
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