The LED - older than we thought

In 1927, Oleg Vladimirovich Losev published details in a Russian journal of the first ever LED. Nikolay Zheludev, at the University of Southampton, has dug up Losev's story.

Losev also published on his discoveries in German and British journals. In sixteen papers between 1924 and 1930 he comprehensively detailed the function of his LED. He used Einstein's then new quantum theory to explain the way electrons dropping in energy produced the light without releasing heat. But a letter he wrote to Einstein asking for help developing the theory of LEDs received no reply.

 

From newscientist