The first visible-spectrum (red) LED was developed in 1962 by <answer>Nick Holonyak, Jr.</answer>, while working at General Electric Company. Holonyak first reported his LED in the journal Applied Physics Letters on the December 1, 1962. M. George Craford, a former graduate student of Holonyak, invented the first yellow LED and improved the brightness of red and red-orange LEDs by a factor of ten in 1972. In 1976, T. P. Pearsall created the first high-brightness, high-efficiency LEDs for optical fiber telecommunications by inventing new semiconductor materials specifically adapted to optical fiber transmission wavelengths.
What GE employee developed the visible-spectrum LED?
Nick Holonyak, Jr.