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Working Principle of LED - The Engineering Knowledge
Light-emitting diode physics - Wikipedia
A Light Emitting Diode (LED) Is A Two Lead Semiconductor Light Source. Electrons Are Able To Recombine With Electron Holes Within The Device, Releasing Energy In The Form Of Photons. Royalty Free
Shedding Light On LED Lights: Leaders In Cost & Performance
LED Lights - How it Works - History
Sources of Visible Light - Introduction to Light Emitting Diodes | Olympus LS