question

(a) write the important considerations which are to be taken into account 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? draw a circuit diagram and explain its action.

(b) draw the v-i characteristics of an led. state two advantages of led lamps over conventional incandescent lamps.

 

 

 

 

 

 

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