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What is a light-emitting diode (LED)?

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What is a light-emitting diode (LED)?

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A light-emitting diode is a semiconductor device which emits light when an electrical current flows through it. Semiconductor diodes can also be used as light detectors. Light-emitting diodes are good detectors of light of specific colors. Generally, the wavelength of light detected by an LED is shorter than the wavelength of light emitted by the same LED. For example, certain red LEDs are relatively good detectors of orange light.

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