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Nick Holonyak (born 1928), US engineer. Holonyak is best known for inventing (1962) a light-emitting diode (LED) that emitted visible red light instead of infrared light. He also holds 41 other patents for inventions including the red-light semiconductor laser (laser diode) - used in CD and DVD players, and the shorted emitter p-n-p-n switch - used in light dimmers and power tools. Photographed in 1981.
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