How can a diode pro­duce light?

Gadgets and Gizmos (India) - - KNOW TECH -


When cur­rent flows across a diode, neg­a­tive elec­trons move one way and pos­i­tive holes move the other ways.


The holes ex­ist at a lower en­ergy level than the free elec­trons, so when a free elec­tron falls it loses en­ergy.


This en­ergy is emit­ted in the form of a light pho­ton. The size of the elec­tron’s “fall” de­ter­mines the en­ergy level of the pho­ton, which de­ter­mines its Colour. A big­ger fall pro­duces a pho­ton with a higher en­ergy level and there­fore a higher light fre­quency.

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