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'''RELATED KEYWORDS: University-Of-California|Swedish-Academy|Shuji-Nakamura|Nobel-Prize-For-Physics-2014|Nobel-Prize|Meijo-University|Isamu-Akasaki|Hiroshi-Amano Nobel prize for physics 2014 goes to inventors of energy-efficient LED light Kounteya Sinha, TNN | Oct 7, 2014, 05.23PM IST

inShare Nobel Physics - 2014 (From left to right): Undated photos of Japanese-born researchers Isamu Akasaki, Hiroshi Amano and a handout photo of Shuji Nakamura released by University of California. The trio won the Nobel prize for physics this year. (Via AFP) LONDON: The invention of an energy source that lights up our computer and/or mobile phone screens and holds promise to brighten up the quality of life of over 1.5 billion people around the world, has been awarded the Nobel prize for physics 2014.

Announcing that "this year's Nobel prize for physics is about light", the Royal Swedish Academy of Sciences decided to award the most coveted prize to three Japanese scientists — Isamu Akasaki from Meijo University, Hiroshi Amano from the Nagoya University, Japan and Shuji Nakamura from the University of California "for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources."

The laureates were rewarded for having invented a new energy-efficient and environment-friendly light source — the blue light-emitting diode (LED).

According to the committee, the laureates' inventions revolutionized the field of illumination technology.

New, more efficient, cheaper and smarter lamps are developed all the time. White LED lamps can be created in two different ways. One way is to use blue light to excite a phosphor so that it shines in red and green. When all colours come together, white light is produced. View image on Twitter View image on Twitter Follow The Nobel Prize ✔ @NobelPrize BREAKINGNEWS #Nobelprize2014 Physics to Isamu Akasaki, Hiroshi Amano @NagoyaUniv_info Shuji Nakamura @ucsantabarbara 3:16 PM - 7 Oct 2014 5,136 5,136 Retweets  1,359 1,359 likes

The other way is to construct the lamp out of three LEDs, red, green and blue, and let the eye do the work of combining the three colours into white.

LED lamps are thus flexible light sources, already with several applications in the field of illumination — millions of different colours can be

The committee chairman Staffan Normak said: "Alfred Nobel would have been very happy with this invention. Artificial light is all around us. The invention of the LED however will be highly beneficial and safer than older light sources. For example, fluorescent light has mercury whereas LEDs doesn't. In future, it can be used to sterilise water as we know that UV light can kill bacteria and viruses. It has been known since 1671 that to get white light, we have to combine red, green and blue light. Red and green light has been around for half a century. Now we have blue which we can effectively mix and create new white light sources." View image on Twitter View image on Twitter Follow The Nobel Prize ✔ @NobelPrize The principle for light-emitting diodes LED (upper left) and an example of a blue LED lamp. #nobelprize2014 #Physics 3:28 PM - 7 Oct 2014 1,255 1,255 Retweets  492 492 likes

Reacting to winning the prize, professor Nakamura who was woken up by the Nobel Committee said "this is unbelievable."

The LED lamp holds great promise: due to low power requirements it can be powered by cheap local solar power.

As about one fourth of world electricity consumption is used for lighting purposes, the LEDs contribute to saving earth's resources. Materials consumption is also diminished as LEDs last up to 100,000 hours, compared to 1,000 for incandescent bulbs and 10,000 hours for fluorescent lights.

The academy said: "In the spirit of Alfred Nobel, the prize rewards an invention of greatest benefit to mankind; using blue LEDs, white light can be created in a new way." Bold text'''