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  Light-emitting diode referred to as LED. Is made of a compound containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N) and the like.
  When the electrons recombine with the holes, they can emit visible light, and can be used to make light-emitting diodes. In the circuit and instrument as an indicator, or the composition of text or digital display. Gallium arsenide diode red light, gallium phosphide diode hair green, silicon carbide diode yellow, gallium nitride   diode blue light. Because of its chemical properties are divided into organic light-emitting diode OLED and inorganic light-emitting diode LED.
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