1. Modern LEDs for lighting

It may seem counter-intuitive to link the history of two technologies that seem as far apart as lighting and radio, yet they were one and the same for over 50 years...

In 1909, Guglielmo Marconi was awarded the Nobel Prize in Physics for the invention of the TSF. Two years earlier, in 1907, Joseph Henry Round, Marconi's personal assistant, published an article on the emission of light by carborundum (SiC) crystals used to amplify radio signals, without understanding the physical principle . In 1929, while...