Inventors of LED awarded 2014 Nobel Prize in physics

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Shuji Nakamura. Photo credit: http://ssleec.ucsb.edu Shuji Nakamura. Photo credit: http://ssleec.ucsb.edu[/caption] The winners of the prestigious prize are Isamu Akasaki and Hiroshi Amano (both Japanese) of Nagoya University and Shuji Nakamura (born in Japan but now an American citizen) of the University of California. When Akasaki, Amano, and Nakamura produced bright blue light beams from their semi-conductors in the early 1990s, they triggered a fundamental transformation of lighting technology. Using blue LEDs, white light can be created in a new way, the Nobel Foundation said. ?With the advent of LED lamps we now have more long-lasting and more efficient alternatives to older light sources,? it said. [caption id="attachment_21927" align="alignleft" width="158"]Horishi Amano Horishi Amano[/caption] Red and green diodes had been around for a long time but without blue light, white lamps could not be created. Despite considerable efforts, both in the scientific community and in industry, the blue LED had remained a challenge for three decades. They succeeded where everyone else had failed. Akasaki worked together with Amano at the University of Nagoya, while Nakamura was employed at Nichia Chemicals, a small company in Tokushima. Their inventions were revolutionary. Incandescent light bulbs lit the 20th century; the 21st century will be lit by LED lamps. White LED lamps emit a bright white light, are long-lasting and energy-efficient. They are constantly improved, getting more efficient with higher luminous flux (measured in lumen) per unit electrical input power (measured in watt). [caption id="attachment_21928" align="alignright" width="197"]Isamu Akasaki Isamu Akasaki[/caption] The most recent record is just over 300 lm/W, which can be compared to 16 for regular light bulbs and close to 70 for fluorescent lamps. As about one fourth of world electricity consumption is used for lighting purposes, the LEDs contribute to saving the 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 LED lamp holds great promise for increasing the quality of life for over 1.5 billion people around the world who lack access to electricity grids: due to low power requirements it can be powered by cheap local solar power. ?The invention of the blue LED is just twenty years old, but it has already contributed to create white light in an entirely new manner to the benefit of us all,? the foundation said. ]]>

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