Special lighting principle of LED: LED of LED light source is made of III-IV compounds, such as GaAs, GaP, GaAsP and other semiconductors, and its core is PN junction.Therefore, it has the I-V characteristics of general P-N junction, that is, forward conduction, reverse cut-off and breakdown characteristics.In addition, under certain conditions, it also has luminescence characteristics.Under forward voltage, electrons are injected into P region from N region, and holes are injected into N region from P region.A part of the minority carriers (minority carriers) entering the other side's region are compounded with the majority carriers (multi carriers) to emit light.
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