History of LED


 Henry Joseph Round first observed the phenomenon of electroluminescence in a piece of  Silicon Carbide (SiC)


 Bernhard Gudden and Robert Wichard Pohl carried out further experiments using phosphor  material  made from Zinc Sulphide doped with Copper.


 George Destriau published a report on the emission of light by Zinc Sulphide (ZnS) powders,  following the application of an electric current. He was credited with inventing “electroluminescence”.


 British experiments into electroluminescence using semiconductor Gallium Arsenide led to the  first  “modern” Light Emitting Diode LED.


 The visible (red) light LEDs were produced using Gallium Arsenside Phosphide.  


 By the mid 1970’s Gallium Phosphide was itself being used as the light emitter and was soon  producing a pale green light.


 The use of Gallium Aluminium Arsenide Phosphide LEDs brought the first generation of  superbright  LEds, first red, then yellow and finally green.


 The first significant blue LEDs also appeared using Silicon Carbide.


 The ultra bright blue chips became the basis of the white LEDs in which the light emitting chip is  coated with fluorescent phosphors. These phosphors absorb the blue light from the chip and then re-emit it as white light.


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