How a LED (light emitting diode) emits different colors?
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the colour of the light emitted in LED is determined by the semiconductor materials that form the diode's PN junction. It is due to the differences in the energy gap band structure of semiconductor materials and so different number of photons is emitted with varying frequencies.
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LEDs produce different colors by using various materials which produce photons at different wavelengths. ... Blue, green and cyan LEDs use the indium gallium nitride (InGaN) system. Together, AlInGaP and InGaN cover almost the entire light spectrum, with a gap at green-yellow and yellow.
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