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Isamu Akasaki, Nobel-prizewinning inventor of the blue LED – obituary

Isamu Akasaki
Credit: TORU YAMANAKA/AFP
Isamu Akasaki, who has died aged 92, shared the 2014 Nobel Prize in physics, with Hiroshi Amano and Shuji Nakamura, for their invention of blue light-emitting diodes (LEDs), an energy-efficient technology now used in everything from light bulbs to televisions, computer screens, smartphones and Christmas tree lights.
In an LED, light is produced when negative electrons combine with positive “holes” in thin layers of semiconductors. Red LEDs became available in the 1960s and were widely used in calculators and digital watches. Green LEDs were developed around the same time. But for many years scientists struggled to create blue LEDs – the only ones capable of being used to produce white light. ....

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Isamu Akasaki, 92, Dies; Nobel Winner Lit Up the World With LEDs

Isamu Akasaki, 92, Dies; Nobel Winner Lit Up the World With LEDs
A physicist, he shared the prize with two others for their breakthrough in creating blue light-emitting diodes, succeeding “where everyone else had failed.”
Isamu Akasaki at Meijo University in Nagoya, Japan, in 2013. Blue light-emitting diodes, which he helped invent, led the way for a vast wave of light sources that are cheaper, more durable and environmentally safer than incandescent and fluorescent bulbs.Credit.The Asahi Shimbun, via Getty Images
By Scott Veale
April 6, 2021Updated 5:45 p.m. ET
Isamu Akasaki, a Japanese physicist who helped develop blue light-emitting diodes, a breakthrough in the development of LEDs that earned him a Nobel Prize and transformed the way the world is illuminated, died on Thursday in a hospital in Nagoya, Japan. He was 92. ....

Matsushita Research Institute Tokyo , University Of Nagoya , Nichia Corporation , மாட்‌ஸூஶீட ஆராய்ச்சி நிறுவனம் டோக்கியோ , பல்கலைக்கழகம் ஆஃப் நாகோயா ,