Origin of Red Laser Diodes in China

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The early red LEDs were bright enough for use as indicators, but the light output was not enough to illuminate an area. Readouts in calculators were so small that plastic lenses were built over each digit to make them legible. OverviewThe history of the light-emitting diode begins with the 1906 discovery of Round, of, made his discovery in 1906 while using aand passing current through combinations of carborundum () crystal. The first commercial visible-wavelength LEDs used GaAsP semiconductors and were commonly.

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