Isamu Akasaki and Hiroshi Amano of Japan and Japanese-born U.S.
citizen Shuji Nakamura won the prize for developing the blue
light-emitting diode (LED) -- the missing piece that now allows
manufacturers to produce white-light lamps.
The
arrival of such lamps is changing the way homes and workplaces are lit,
offering a longer-lasting and more efficient alternative to the
incandescent bulbs pioneered by Joseph Swan and Thomas Edison at the end
of the 19th century.
"Red and green LEDs have
been around for a long time but blue was really missing. Thanks to the
blue LED we now can get white light sources which have very high energy
efficiency and very long lifetime," Per Delsing, a member of the Royal
Swedish Academy of Sciences, told a news conference.
The
award is a notable example of a practical discovery winning the prize
-- in contrast to last year, when the physics prize went to scientists
who predicted the existence of the Higgs boson particle that explains
how elementary matter attained the mass to form stars and planets.
"Incandescent light bulbs lit the 20th century; the 21st century will be lit by LED lamps," the academy said in a statement.
Frances Saunders, president of Britain's Institute of Physics, said the shift offered the potential for huge energy savings.
"With
20 percent of the world's electricity used for lighting, it's been
calculated that optimal use of LED lighting could reduce this to 4
percent. Akasaki, Amano and Nakamura's research has made this possible
and this prize recognises this contribution," she said.
Akasaki
is at the Meijo University in Japan and Amano is professor at the
Nagoya University. Nakamura is at the University of California, Santa
Barbara.
Contacted by telephone in the middle of the night, Nakamura said of the award: "It's unbelievable."
Nakamura
invented the blue-light emitting diode while working at Nichia, an
unlisted firm, but received next to nothing from them for the work until
2004, when the Tokyo District Court ordered Nichia to pay him a record
20 billion yen.
Colin Humphreys, an expert at the
University of Cambridge who is working on next-generation LED lighting,
said the ability of the three scientists to crack the problem of blue
light when others had failed was a tremendous achievement.
"Their
invention of efficient blue LEDs has paved the way for the development
of bright, cost effective and, importantly, energy efficient white
lighting," he said.
In addition to lighting
buildings, LED bulbs are transforming lamps in cars and the technology
is also used as a light source in smartphone and computer screens.
The
LED boom upended the lighting market, creating both opportunities and
challenges for major players like Dutch group Philips, which has been
making light bulbs for 123 years but is now splitting off its lighting
business.
As winners of the physics award, the
laureates join some of the biggest names in science such as Albert
Einstein, Niels Bohr and the husband and wife team of Pierre and Marie
Curie.
The prize is also something of a boost to
Japan’s scientific reputation after it was tarnished by a discredited
high profile stem cell study that had seemed to offer hope for replacing
damaged cells or even growing new human organs.
It
came on the same day as the author of that study, Haruko Obokata, was
told by Waseda University that it will strip her of her doctorate unless
she corrects it within a year.
Obokata’s
discovery was first trumpeted as a game-changer, but questions soon
arose about the research and investigations found that Obokata had
plagiarized and fabricated parts of the papers.
Physics
was the second of this year's crop of Nobels. The prizes were first
awarded in 1901 to honour achievements in science, literature and peace
in accordance with the will of dynamite inventor and business tycoon
Alfred Nobel.
