Isamu Akasaki was an electrical engineer whose research helped establish gallium nitride as a material for blue and ultraviolet light-emitting diodes. Working with Hiroshi Amano and other collaborators, he pursued improvements in crystal quality and in the control of p-type and n-type semiconductor.[ref]
Fascinated Journeys into Blue Light by Isamu Akasaki. Introduction; crystal-growth and p-type-conduction sections
The scientific motivation follows from photon energy: shorter visible wavelengths require larger transition energies. A sufficiently wide band gap is therefore necessary for blue emission, but it does not by itself produce a useful device. The material must also support carrier injection and efficient light emission. High-quality growth and an operating p-n junction turned those physical requirements into an engineering platform for full-colour displays and lighting.[ref]
Fascinated Journeys into Blue Light by Isamu Akasaki. Sections 1–2 and account of the 1989 p-n-junction LED
Portrait of Isamu Akasaki
. 大臣官房人事課; attribution: 文部科学省ホームページ. CC BY 4.0, via Wikimedia Commons. Source.
Isamu Akasaki (1929–2021) was a renowned Japanese physicist celebrated for his groundbreaking work in the development of blue light-emitting diodes (LEDs). Alongside Shuji Nakamura and Hiroshi Amano, Akasaki was awarded the Nobel Prize in Physics in 2014 for his contributions to the invention of efficient blue LEDs, which have played a crucial role in the advancement of energy-saving lighting and display technologies, including LED televisions, smartphones, and general lighting.
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