Citation Laureate Shuji Nakamura Shares 2014 Nobel in Physics

October 2014
Read a 2000 ScienceWatch Interview, and More on All Three Winners

On October 7, the winners of the 2014 Nobel Prize in Physics were announced: Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura, honored "for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources.”

One of the three researchers, Shuji Nakamura, was named a Thomson Reuters Citation Laureate in Physics in 2002.

In 2000, Nakamura was interviewed in the print edition of ScienceWatch about the early challenges and successes in his groundbreaking work on blue laser diodes. A pdf of the story can be accessed here.

The innovations of Nakamura and his fellow 2014 Nobel winners in Physics have also registered in Thomson Reuters Derwent World Patents Index, a resource that now covers nearly 50 million patent documents worldwide.  

A quick search of the researchers’ patents reveals the following:

Nakamura is named as inventor on 484 patented inventions in the field of Electro-(in)organic materials published from 1991 to date. The most highly cited of these inventions is US6153010A, published in 2000, for “Method of growing nitride semiconductors, nitride semiconductor substrate and nitride semiconductor device” and cited by 427 later published patents. Nakamura is not listed as co-inventor of any inventions together with Akasaki or Amano.

Akasaki is named as inventor on 303 patented inventions from 1978 to date. Most highly cited is US5247533A, published 1993, for “Gallium nitride cpd. semiconductor laser diode emitting blue, violet and UV light is based on P- and N-aluminium gallium indium nitride layers, the P layer being formed by electron beam irradiation” and cited by 213 later published patents.

Amano is named as inventor on 597 patented inventions from 1995 to date. He is named as co-inventor together with Akasaki on the most highly cited invention which is also US5247533A (above).

Amano and Akasaki are named as co-inventors on a total of 208 inventions, so they clearly collaborate closely together in this work. Sixty-five of these co-inventions are assigned to TOYODA GOSEI KK and 41 to UNIV MEIJO.

The data and citation records included in this report are from Thomson Reuters Web of ScienceTM. Web of ScienceTM is a registered trademark of Thomson Reuters. All rights reserved.