Appliance Science: The Illuminating Physics of LED Lights

In my Appliance Science column for CNet, I look into the fascinating physics of LED lights. It’s all about electrons, quantum physics, energy levels and water flowing downhill.

AS2-LED-P1-smlAnd, like a waterfall, interesting things happen at this point where the flow is controlled. Whereas a waterfall makes noise, electrons flowing across the pn-junction of an LED release light. As the electrons flow from the n to the p layer, the energy level of the electrons falls, dropping from the higher energy level of the p-type layer to the lower one of the n-type. This energy is released as a photon, which we see as light.

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Richard Baguley has been writing about technology for over 20 years. He has written for publications such as Wired, Macworld, USA Today, Reviewed.com. Amiga Format and many others.

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