From the information of energy band gaps of diodes, how do you decide which can be the light emmiting diodes
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Answer: LED
Explanation:
LEDs are made from direct semiconductors so that nothing else (phonons) is required. The point of the device is to create photons from an electron-hole pair and it would be highly inefficient to introduce extra energy for the electron and hole to recombine. In direct band gap semiconductors like gallium nitride most of these electrons are in the trough of the conduction band and may move to the valence band without any change in momentum from a phonon. The band gap energy of an LED can be determined by measuring the voltage across an LED at the point which the LED barely begins to turn on.
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=> Diodes with band gap energy in the visible spectrum range can function as light emitting diode(LED).
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