The history of LEDs began in the early twentieth century. In 1907, the British explorer Henry Round proposed LED-based technology. He noticed a glow around the work detector contacts. Marconi in the UK
For the first time in the history of the laboratory, the luminescence of silicon carbide was recorded. Later in 1923, the Russian scientist Oleg Vladimirovich Losheev discovered the connection of this phenomenon. In the Nizhny Novgorod laboratory,
He observed the luminescence of silicon carbide crystals when studying the radiation complex phenomenon. Loseff was the first to demonstrate semiconductor electroluminescence, that is, when current flows. This is the first step in creating LEDs, but this discovery has not been applied for decades.
The industrial development of semiconductor lamps began in 1951 with the establishment of a "semiconductor lamp" development center in the United States, operating on the basis of the "Losef effect", a physicist and inventor Kurt Ledowitz (Kurt) Legovets) leadership.
In 1955, Rubin Braunstein of the American Radio Company described the combination of infrared radiation from gallium arsenide (GaAs) with other semiconductor alloys. Braunstein observed at room temperature based on gallium antimonide
(GaSb), infrared emission from a simple diode structure of gallium arsenide, indium phosphide (InP) and silicon germanium alloy (SiGe).
In the 1960s, the first LEDs from GaP were fabricated to emit red and yellow-green light. The wavelengths emitted by these devices are within the upper limit of the human eye (500-600 nm), so for indication purposes, this yellow-green
The fluorescence is sufficient. The luminous efficiency of LEDs is approximately 1-2 lumens per watt. 1962 - The University of Illinois, led by Nick Holonyak, created the first industrial-scale LEDs based on GaAsP / GaP structures. Nick Holonyak was
Think of the "father" of modern LED.