brief introduction： Light-emitting diodes are called LED for short. Made from compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc. When electrons combine with holes, they emit visible light, which can be used to make light-emitting diodes. Used as an indicator light in circuits and instruments, or as a text or digital display. Gallium arsenide diodes emit red light, gallium phosphide diodes green light, silicon carbide diodes yellow light, and gallium nitride diodes blue light. Becaus

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