First LED: The radiating capability of LED was first discovered by Oleg Vladimirovich Losev, a radio technician in 1920. But the formal introduction of LED as an electronic component took place in 1962. Since then, the LED has evolved in to various forms to be used in a variety of applications.
1955 – Emission of IR radiation by simple diode structure observed by Rubin Braunstein. He discovered that simple diode structures using gallium antimonide (GaSb), GaAs, indium phosphide (InP), and silicon-germanium (SiGe) alloys were emitting IR rays at room temperature and at 77 Kelvin.
1961 – Infrared LED patented by scientists Robert Biard and Gary Pittman at Texas
1962 – First visible (red) LED developed by Nick Holonyak Jr.
1968- The Monsanto Company was the first organization to mass-produce visible LEDs, using gallium arsenide phosphide into produces red LEDs suitable for indicators
1972 – First yellow LED developed by M. George Craford
1976 – High brightness and highly efficient LEDs developed for optical fiber communication by T.P.Pearsall
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