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Nobel Prize for Blue LEDs

08.10.2014

The 2014 Nobel Prize in Physics was awarded to the inventors of high-efficiency blue LEDs.

The prize was awarded to three Japanese scientists: Isamu Akasaki, Hiroshi Amano and Shuji Nakamura. At first glance, a modest achievement, especially against the backdrop of such a sensational Higgs boson. But one should not draw hasty conclusions: the phenomenon of the glow of semiconductors was first recorded at the beginning of the 20th century, but it took almost 100 years to bring this technology to perfection.

Moreover, it was the work of the aforementioned trinity that made it possible to realize the idea of a highly efficient semiconductor light source, because powerful white LEDs basically carry crystals that emit precisely in the blue (less often ultraviolet) range, and the white color of the glow is achieved through the use of special phosphors.

If there is still a long way to go before any practical use of the Higgs boson, and it is not known what it can be, then the fruits of the work of the 2014 laureates are already being used by all of humanity, and the technology continues to improve. Efficiencies of the order of 300 lumens per watt have already been achieved, which is three times the best result of 2005, and this is probably not the limit yet. And the areas of application of high-power white LEDs will only multiply, since today it is the most efficient and economical light source with a good color rendering index.

As noted by the Nobel Committee, "the light of this invention is noticeable in every window of Stockholm." And not far off is the time when he will come to all the cities of our planet.

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According to new data, the Hubble constant is 73,5 kilometers per second per megaparsec, that is, the discrepancy between the already known values turned out to be even greater than previously thought.

Almost 100 years ago, astrophysicist Edwin Hubble, observing distant galaxies, determined that they do not stand still, but gradually scatter to the sides, and the speed of removal of a particular galaxy is directly proportional to the distance to it. Today, this law is called the Hubble law, the constant that enters into it is called the Hubble constant.

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