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A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.
Sapphire values are taken from Kingery, W.D. and Norton, F.H., USAEC Rept. NYO-6447, 1-14, 1955, TPRC II pages 94, 96, curve 19 ref. 72 page 1160. Errata: The numbered references in the NSRDS-NBS-8 pdf are found near the end of the TPRC Data Book Volume 2 and not somewhere in Volume 3 like it says. Aluminium oxide, porous 22% Porosity 2.3
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