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Science-XII-2018Professors NotesBinding energy, E = Δmc2What is LED? Mention two of its applications.he

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Alight-emitting diode(LED) is asemiconductorlight sourcethat emits light whencurrentflows through it.Electronsin the semiconductor recombine withelectron holes, releasing energy in the form ofphotons. This effect is calledelectroluminescence.

Light-emitting diodes areusedinapplicationsas diverse as aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes, lighted wallpaper and medical devices.



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