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Current Affairs Quiz
asked Oct 9, 2014 in Education by rajkumar (2,290 points) 138 views

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Discovery of blue LEDs The three scientists of Japanese origin have been awarded the Nobel for inventing blue light emitting diodes or LEDs. Although red and green LEDs have been in existence for decades now, development of blue LEDs posed a formidable challenge to scientists and researchers. Within a LED, current is applied to multiple semiconductor materials, which emit a particular wavelength of light depending on the chemical make-up of the semiconductor materials in question. Gallium nitride was the semiconductor used by the Japanese researchers to develop the blue LED. Growing adequately big crystal of gallium nitride was the challenge that many researchers couldn’t figure out. Akasaki and Amano, worked together in 1986 to get the gallium nitride to grow to a big size, with the help of a specifically designed scaffold partially made from sapphire. In 1990, Nakamura also managed to induce the gallium nitride to grow to a big size by manipulating the temperature to induce its growth. Their work in discovering blue LEDs led to the combining of red, green and blue LEDs to form white LEDs. Significance of blue LEDs Blue LED is an extremely significant development on its own, and because it was a stepping stone in the development of white LED, it is a path-breaking milestone. Blue LEDs are used in many products nowadays. Smartphones, for example, use blue LEDs. White LEDs are used in a plethora of products from lamps tto television screen to computer screens. LEDs use much less energy than incandescent lamps, and are efficient enough to run on locally generated solar power. It is major development in the 21st century where energy conservation has become vital
answered Oct 9, 2014 by rajkumar (2,290 points)

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