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The Origin of LEDs

Posted by aswin at May 14, 2017 in Technology

These days, there are so many electronic devices that using LEDs technology. What is LED? LEDs (Light-emitting diodes) were actually an accidental discovery at 20th century, when electricity applied to the semiconductor Silicon Carbide (SiC) and produced a light. Because the light was too dim to be of any use, so the research was never distributed.  But that was the start.

Around 20 years later, Russian and German scientists revisited the idea of light produced this way, but the light was still very poor.

A report published in 1936, which helped to invent the term electroluminescence, revived the research for light from this source. At 1950s, some British scientists started experimenting with it and they produce the first infrared LED. From this technology came the first visible spectrum LED, in red, from Gallium Phosphide (GaP).

Then by the 1990s the use of Gallium Nitride helped usher in the era of blue LEDs. These blue lights became the basis for white light.  The use of fluorescent phosphors helped change that blue light into high intensity white lights.  Now LEDs can be found in almost every visible color of light.

After that, LED was used in appliances, calculators and watches. Then, James P. Mitchell discovered the first LED flat panel television prototype in 1977. This prototype was a red, monochromatic display. Later, in the 1990s, low-cost, efficient blue LEDs emerged moving this use along. Once a full spectrum of colors was realized in the late 1990s the flat panel LED television became a fully functional and popular option.

As the LED technology advanced and the luminescence increased, the uses for LEDs increased.  LEDs began popping up in devices used to illuminate areas.  Flashlights, landscape lighting, traffic lights, emergency lights and other lighting sources begins to use this technology as the production cost of it is very cheap.

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