The first high-brightness blue LED was demonstrated by Shuji Nakamura of Nichia Corporation in 1994 and was based on InGaN. In parallel, Isamu Akasaki and Hiroshi Amano in Nagoya were working on developing the important GaN nucleation on sapphire substrates and the demonstration of p-type doping of GaN. Nakamura, Akasaki and Amano were awarded the 2014 Nobel prize in physics for their work. In 1995, Alberto Barbieri at the Cardiff University Laboratory (GB) investigated the efficiency and reliability of high-brightness LEDs and demonstrated a "transparent contact" LED using indium tin oxide (ITO) on (AlGaInP/GaAs). COUNT 5
QSN1 What color LED was demonstrated in 1994? ANS1 blue QSN2 Who demonstrated the first blue LED? ANS2 Shuji Nakamura QSN3 What did Nakamura, Akasaki, and Amano receive for their work? ANS3 2014 Nobel prize in physics QSN4 Who investigated the efficiency of high-brightness LED at Cardiff University in 1995? ANS4 Alberto Barbieri QSN5 What substance did Barbieri use in his work with high-brightness LED? ANS5 indium tin oxide