Hiroshi Amano receiving his Nobel Prize from His Majesty King Carl XVI Gustaf of Sweden at the Stockholm Concert Hall, 10 December 2014. Copyright © Nobel Media AB 2014
Photo: Alexander Mahmoud

Hiroshi Amano after receiving his Nobel Prize at the Stockholm Concert Hall, 10 December 2014. Copyright © Nobel Media AB 2014
Photo: Alexander Mahmoud

Hiroshi Amano receiving his Nobel Prize from His Majesty King Carl XVI Gustaf of Sweden.

© Nobel Media AB 2014. Photo: Niklas Elmehed

Nobel Laureates at the Nobel Prize Award Ceremony. From left: Physics Laureates Isamu Akasaki, Hiroshi Amano and Shuji Nakamura; Chemistry Laureates Eric Betzig, Stefan W. Hell and William E. Moerner; Medicine Laureates John O'Keefe and May-Britt Moser. Copyright © Nobel Media AB 2014
Photo: Niklas Elmehed

Hiroshi Amano receiving his Nobel Prize. Overview from Nobel Prize Award Ceremony at the Stockholm Concert Hall, 10 December 2014. Copyright © Nobel Media AB 2014
Photo: Alexander Mahmoud

Hiroshi Amano at the Nobel Prize Award Ceremony at the Stockholm Concert Hall. Copyright © Nobel Media AB 2014
Photo: Alexander Mahmoud

Hiroshi Amano with family and relatives on stage after the Nobel Prize Award Ceremony at the Stockholm Concert Hall, 10 December 2014. Copyright © Nobel Media AB 2014
Photo: Alexander Mahmoud

Hiroshi Amano arrives at the Nobel Banquet at the Stockholm City Hall on 10 December 2014, together with his wife, Mrs Kasumi Amano.

© Nobel Media AB 2014. Photo: Helena Paulin-Strömberg

Hiroshi Amano and Mrs Yuki Nakamura, spouse of Shuji Nakamura, proceed into the Blue Hall.

© Nobel Media AB 2014. Photo: Helena Paulin-Strömberg

Hiroshi Amano and Her Majesty Queen Silvia of Sweden at the table of honour.

© Nobel Media AB 2014. Photo: Helena Paulin-Strömberg

Hiroshi Amano and Mrs Yuki Nakamura, spouse of Shuji Nakamura, at the table of honour. Copyright © Nobel Media AB 2014
Photo: Niklas Elmehed

Hiroshi Amano at the table of honour at the Nobel Banquet. Copyright © Nobel Media AB 2014
Photo: Niklas Elmehed

Hiroshi Amano photographing his wife at the Nobel Banquet. Copyright © Nobel Media AB 2014
Photo: Niklas Elmehed

Hiroshi Amano showing his Nobel Medal during his visit to the Nobel Foundation on 12 December 2014.

Ten of the thirteen Nobel Laureates of 2014 assembled at the Nobel Foundation in Stockholm on 12 December 2014. From left: Edvard I. Moser, May-Britt Moser, Shuji Nakamura, Stefan W. Hell, Patrick Modiano, Hiroshi Amano, Kailash Satyarthi, Jean Tirole, Eric Betzig and William E. Moerner. Copyright © Nobel Media AB 2014
Photo: Alexander Mahmoud

Hiroshi Amano delivering his Nobel Lecture.

Copyright © The Royal Swedish Academy of Sciences 2014 Photo: Sara Gustavsson

All three Physics Laureates on stage after the Nobel Lectures in the Aula Magna, Stockholm University, 8 December 2014. From left: Shuji Nakamura, Isamu Akasaki and Hiroshi Amano.

Copyright © Nobel Media 2014

Press conference at the Royal Swedish Academy of Sciences on 7 December 2014. From left: Laureate in Economic Sciences Jean Tirole, Nobel Laureates in Chemistry Eric Betzig, William E. Moerner, Stefan W. Hell, Nobel Laureates in Physics Hiroshi Amano and Shuji Nakamura.

Copyright © The Royal Swedish Academy of Sciences 2014 Photo: Markus Marcetic

All three Physics Laureates assembled at the Royal Swedish Academy of Sciences on 7 December 2014. From left: Hiroshi Amano, Isamu Akasaki and Shuji Nakamura.

Copyright © The Royal Swedish Academy of Sciences 2014 Photo: Markus Marcetic

Like many Nobel Laureates before him, Hiroshi Amano autographs a chair at Bistro Nobel at the Nobel Museum in Stockholm, 6 December 2014.

Photo: Janerik Henriksson/TT

Hiroshi Amano presenting his gift to the Nobel Museum's collection: pieces of graphite included in the early blue LEDs that he developed, during the 2014 Nobel Laureates' Get together on 6 December 2014. Copyright © Nobel Media AB 2014
Photo: Niklas Elmehed

Physics Laureates Hiroshi Amano (left) and Shuji Nakamura (right) at the 2014 Nobel Laureates' Get together at the Nobel Museum in Stockholm, Sweden, on 6 December 2014. Copyright © Nobel Media AB 2014
Photo: Niklas Elmehed

Hiroshi Amano arriving at the Nobel Museum in Stockholm, Sweden, for the 2014 Nobel Laureates' Get together on 6 December 2014. Copyright © Nobel Media AB 2014
Photo: Niklas Elmehed