Skip to main content

Akasaki, Isamu

Isamu Akasaki, 1929–, Japanese physicist, Ph.D. Nagoya Univ., Japan, 1964. He is a professor at Meijo Univ. and a distinguished professor at Nagoya Univ. in Japan. Akasaki shared the 2014 Nobel Prize in Physics with Hiroshi Amano and Shuji Nakamura for the invention of efficient blue light-emitting diodes (LEDs), which has enabled the development of bright, energy-saving white light sources. The three scientists, Akasaki and Amano working together at Nagoya Univ. and Nakamura working independently, found a way to produce blue light from semiconductors in the early 1990s. This allowed white light LED sources to be developed through the combination of blue LEDs with pre-existing red and green LEDs. The invention has allowed the incandescent bulbs that lit the world of the 20th cent. to be replaced by energy-saving and more environmentally friendly LED light sources.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Akasaki, Isamu." The Columbia Encyclopedia, 6th ed.. . 17 Jan. 2019 <>.

"Akasaki, Isamu." The Columbia Encyclopedia, 6th ed.. . (January 17, 2019).

"Akasaki, Isamu." The Columbia Encyclopedia, 6th ed.. . Retrieved January 17, 2019 from

Learn more about citation styles

Citation styles gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, cannot guarantee each citation it generates. Therefore, it’s best to use citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

The Chicago Manual of Style

American Psychological Association

  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.