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Question

Mention the important considerations required while fabricating a p-n junction diode to be used as a Light Emitting Diode (LED).What should be the order of band gap of an LED if it is required to emit light in the visible range?

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Solution

1.The reverse breakdown voltage of LEDs are very low, which is around 5V. So enough care is to be taken while fabricating a pn-junction diode such that the high reverse voltages do not occur across them.
2. There exist very small resistance to limit the current in LED. So a resistor must be placed in series with the LED such that no damage is occurred to the LED.
The semiconductor used for fabrication of visible LEDs must at least have a band gap of 1.8 eV

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