In October 1962, Nick Holonyak and colleagues at General Electric built the first practical light-emitting diode, or LED, that could emit visible light. Semiconductor LEDs are now a part of uncountable electronic devices. Holonyak discusses the invention, and his work since then.
Source: http://www.npr.org/2012/10/12/162790782/fifty-years-ago-a-bright-idea?ft=1&f=1007
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