THE STORY SO FAR
1907: Electroluminescence as a phenomenon was discovered by the British experimenter H. J. Round of Marconi Labs. 1962: The first practical visible- spectrum (red) LED was developed by Nick Holonyak. Holonyak is seen as the "father of the light-emitting diode”. 1972: M. George Craford is a former graduate student of Holonyak, invented the first yellow LED 1968: Hewlett Packard (HP) introduced LEDs. 1970: Commercially successful LED devices at less than five cents each were produced by Fairchild Optoelectronics. 1977: All LED TV screen is credited to J.P. Mitchell.