A semiconductor light-emitting diode, similar to a semiconductor laser, is also a PN junction that uses an external power source to inject electrons into the PN junction to emit light. Semiconductor light-emitting diodes, also known as LEDs, are composed of a P-layer formed by P-type semiconductors, an N-layer formed by N-type semiconductors, and an active layer formed by a double heterostructure in the middle. The active layer is a luminescent region with a thickness of 0.1-0.2 μ About m Luminescence mechanism
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