Russian production of led equipment
  • 130 years of LED history

For 130 years people have been using Edison's main invention - lamps. And for this entire rather long period, people have operated only two versions of light sources - gas-discharge and thermal. At the end of the 20th century, the world saw another type of electric light source - semiconductor light sources or light-emitting diodes.
For the first time, the British scientist Henry Round announced the emission of light by a solid-state diode in 1907. Then, in 1923, a young and very active head of the technical laboratory of Nizhny Novgorod, Oleg Vladimirovich Losev, discovered a faint blue glow from some semiconductor detectors that convert the high-frequency signal of a radio station into low-frequency sound from simple radio receivers. Cold light appeared inside the silicon carbide crystal as a result of incomprehensible and unverified transformations, but was so small that it literally and figuratively remained invisible to the scientific community. It is worth noting that Oleg Vladimirovich Losev made two main discoveries in his life: he proved that a semiconductor crystal can increase and produce high-frequency radio signals, and that is precisely this - he discovered the emission of cold light when current flows.
130 years of LED history
130 years of LED history
In the 60s of the XX century, the first devices appeared that used this cold glow effect - indicator elements with weak red radiation, and a few years later revealed a green glow. It is these devices that are called LEDs. But then, LEDs had significant drawbacks (the light output of LEDs in those years was no more than 0.1 lm/W, the service life was measured only in hundreds of hours) and, of course, the scientific community did not even consider them as light sources. In 1968, Monsanto launched the first series of LEDs (Light Emitting Diodes). Hewlett-Packard immediately created an LED display for advertising — a dim, red-only display — but the world's first.