Isamu Akasaki

Isamu Akasaki

Nascimento 30 de janeiro de 1929
Kagoshima
Morte 1 de abril de 2021 (92 anos)
Nagoia
Nacionalidade japonês
Alma mater Universidade de Quioto
Prêmios Medalha Edison IEEE (2011), Nobel de Física (2014), Prêmio Charles Stark Draper (2015)
Campo(s) física

Isamu Akasaki (em japonês: 赤崎 勇, Akasaki Isamu; Kagoshima, 30 de janeiro de 1929Nagoia, 1 de abril de 2021) foi um físico japonês. Foi laureado com o Nobel de Física de 2014, em conjunto com Hiroshi Amano e Shuji Nakamura, "pela invenção de diodos azuis emissores de luz que permitiram fontes de luz brilhantes e economizadoras de energia".[1]

Em 1989 foi o primeiro a produzir diodo emissor de luz azul, baseado na junção PN com o material semicondutor nitreto de gálio (GaN).[2] Por este trabalho recebeu em 2011 a Medalha Edison IEEE.[3]

Akasaki estudou até 1952 engenharia elétrica na Universidade de Quioto, obtendo um doutorado na Universidade de Nagoya. Seus primeiros trabalhos na área da optoeletrônica e diodos emissores de luz foram realizados no final da década de 1960 e na década de 1970, entre outras empresas na Matsushita. Em 1981 e nos anos seguintes, tendo retornado para a Universidade de Nagoya, usando deposição de vapor por processos químicos organometálicos (em inglês: Metalorganic vapour phase epitaxy (MOVPE)) para a produção de monocristais de nitreto de gálio com elevada pureza sobre um substrato de safira. Conseguiu produzir em 1989 o primeiro diodo emissor de luz azul eficiente.[4][2] Anteriormente eram produzidos apenas LED´s azuis baseados no semicondutor indireto carbeto de silício. Estes LEDs foram disponibilizados ao mercado na década de 1970, mas não foram utilizados em grande escala em razão de sua baixa eficiência.

Morreu em 1 de abril de 2021 em um hospital de Nagoia, aos 92 anos de idade, de pneumonia.[5]

Condecorações selecionadas

Referências

  1. «The Nobel Prize in Physics 2014» (em inglês). Fundação Nobel. Consultado em 7 de outubro de 2014 
  2. a b Hiroshi Amano, Masahiro Kito, Kazumasa Hiramatsu and Isamu Akasaki, "P-Type Conduction in Mg-Doped GaN Treated with Low-Energy Electron Beam Irradiation (LEEBI)", Jpn. J. Appl. Phys. Vol. 28 (1989) L2112-L2114, doi:10.1143/JJAP.28.L2112
  3. «IEEE Edison Medal Recipients» (PDF; 151 kB). IEEE. Consultado em 7 de outubro de 2014 
  4. Applied Physics Letters, Volume 48, Issue 5, pp. 353-355[ligação inativa]
  5. «Nobel laureate Isamu Akasaki, inventor of first efficient blue LED, dies». The Japan Times (em inglês). 2 de abril de 2021. Consultado em 2 de abril de 2021 


Precedido por
Ray Dolby
Medalha Edison IEEE
2011
Sucedido por
Michael Francis Tompsett
Precedido por
François Englert e Peter Higgs
Nobel de Física
2014
com Hiroshi Amano e Shuji Nakamura
Sucedido por
Takaaki Kajita e Arthur Bruce McDonald


Media relacionados com Isamu Akasaki no Wikimedia Commons

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