= Isamu Akasaki
{c}
{wiki}
= I. Akasaki
{c}
{synonym}
<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>.<Fascinated Journeys into Blue Light by Isamu Akasaki>[Introduction; crystal-growth and p-type-conduction sections]{ref}
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.<Fascinated Journeys into Blue Light by Isamu Akasaki>[Sections 1–2 and account of the 1989 p-n-junction LED]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Isamu_Akasaki_201111.jpg?width=260]
{title=Portrait of <Isamu Akasaki>}
{description=大臣官房人事課; attribution: 文部科学省ホームページ. https://creativecommons.org/licenses/by/4.0/[CC BY 4.0], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Isamu_Akasaki_201111.jpg}
{width=260}
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