Nobel blue LED – Republic

-This uszczęśliwiłby invention of Alfred Nobel – said prof. Olle Inganas of energy-efficient blue LEDs

Source: 123RF

Source: Republic

Award went to three Japanese inventors blue LED used, among others, lighting – says Krzysztof Urbanski.

Isamu Akasaki Hiroshi Amano and Shuji Nakamura share the sum of 8 million kronor (3.7 million zł.)

“With the advent of LEDs have more lasting and effective alternative for older light sources. Approximately one-quarter of the world’s electricity consumption is absorbed by the light “- said in a statement the Nobel committee.

– The usefulness of this invention uszczęśliwiłaby Alfred Nobel – noted prof. Olle Inganas Linkoping University, presenting the names of the winners at a conference in Stockholm .

– It is fascinating that many large companies have worked on the creation of this invention, but he reconsiders – said prof. Per Delsing of Chalmers University of Technology in Gothenburg.

Isamu Akasaki working on Meijo University in Japan and the University of Nagoya, Hiroshi Amano is a professor at the University of Nagoya, and Shuji Nakamura, who was born in Japan, is an American citizen and works at the University of California at Santa Barbara.

When the winners in December arrive for the ceremony of the award will be difficult for them not to notice his invention in virtually all the glowing windows of the Swedish capital.

Of course Utility LED bulbs do not emit blue light (although there are some), most of them shining bright white light. Unlike fluorescent lamps (called in our energy saving light bulbs) do not contain harmful mercury.

Red and green LEDs have been with us for nearly half a century, but to truly revolutionize lighting technology, needed a blue source. White light is created only with red, green and blue. Despite many efforts in research centers and industry for 30 years has not managed to build a blue LED.

The LEDs are more durable than other light sources. Light bulbs have a lifetime of approx. 1,000 hours, about 10 thousand lamps. hours. LEDs have a lifetime of up to 100 thousand. hours.

Red light-emitting diode was invented in the late 50s of the last century. Such diodes have been used in watches and calculators, as indicators of widespread in domestic appliances.

A light-emitting diode is composed of several layers of a majority of electrons (referred to as n-type layers – negative), and the layers of insufficient electron (p-type – positive), also called the excess of positively charged holes.

Among them is the active layer, which roam the negative electrons and positive holes, when you see the voltage. Recombination of electrons and holes (particles connection with opposite electric charges) causes the illumination of the layer. The wavelength of light depends only on semiconductors. Blue light of short wavelength appears only in some materials.

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