Isamu Akasaki, Hiroshi Amano and Shuji Nakamura have been award the 2014 Nobel Prize in Physics "for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources".
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When I was a kid, LEDs were almost always red and largely only used as power indicators on stereo receivers and similar electronics. The Veritasium YouTube channel tells the story of how the Nobel Prize-winning work of three researchers Isamu Akasaki, Hiroshi Amano, and, separately, Shuji Nakamura made blue light-emitting diodes possible in the 1990s.
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