New light all over the world. Nobel to the inventors of blue LED

The Nobel award to Isamu Akasaki, Hiroshi Amano, Shuji Nakamura. Thanks to their efforts we have today new efficient and lasting alternatives to the old lighting sources.

A new light all over the world. A nice slogan from Stockolm to celebrate Isamu Akasaki, Hiroshi Amano an Shuji Nakamura, the Japanese scientists who received the Nobel for Phisic in 2014. Three researchers who developed the blue LED, essential component for most of the modern lighting systems, from portable torch to Christmas tree lamps, to last generation televisor-set. Their work, from beginning of Nineties, has completely changed the lighting world, even that of professional lighting.

Grandchildren of lamps. LED is an acronym of Light Emitting Diode. The earth of LED is not an high temperature metal filament, as in the common incandescent lamps, but a diode that is a small semi-conductor device, using silicon, germanium o indium. The color of the light is due to the material used for the diode production. At the beginning of Sixties, for example, the first LED was able to emit infrared light, while today they can be used with different colors, thanks to the studies of these three scientists.

The world in blue color. “For the invention of efficient blue LED, which made possible to create new brilliant and economic white light sources”. This is the motivation from The Stockolm Academy for the 2014 Nobel award. The very critical problem to be solved in the past years, that is to produce white light from blue sources, has been a severe test for all the scientists who made researches in this field, lasting more than thirty years. Akasaki, born in 1929, and Amano, born in 1960, worked together at Nagoya University, while Nakamura worked in a small company in Tokushima, Nichia Chemicals: they succeed in this hard exercise.

The recent studies opened the way to new efficient and lasting alternatives to the old lamps: LED has now a performance 20 times an incandescent lamp, and 4 time a fluorescent lamp. Considering that a quarter of the electric energy in the world is used for lighting, it is clear what energy saving is now easy to get.

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