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Physics Nobel Prize 2014 for inventors of blue LED from Japan

Chennai, Oct 10 ():Isamu Akasaki of Meijo University, Hiroshi Amano of Nagoya University, and Shuji Nakamura of the University of California are the winners of Nobel Prize for Physics 2014 in appreciation of their research and invention of blue LED. .com congratulates the winners.

LED (Light Emitting Diodes) technology is widely used in lighting.  It is everywhere,  in our hand phones, our houses, streets  and factories. LED is important to us because it saves our energy bills.  A revolutionary change is visible in computer screens, smart phones and cars. More significant contribution of LED tech is for the Environment. This was made possible by inventions through concerted efforts.

The Nobel Prize is only a lesser reward for those great persons who spent their lives for the invention of advanced technology. The honour should bring them satisfaction and happiness. For the people who use the technology it means a lot more but they do not realize it because they are not well versed in Science.

Those who think globally can appreciate further advance in the LED lighting. It will reduce the energy consumption for lighting from 20% to 4%. Moreover, the intangible benefit shall outweigh the tangible benefits.

Compare the appearance of a filament bulb of a standard shape with the present  day lamps in various fancy shapes and colours displayed in an electrical shop. There is more to come.

On 14.10.1878, Edison recorded his research on carbon filament lamps. The prolific inventor had struggled hard to create vacuum in a bulb and to  find a suitable material to convert electric energy into light energy. He succeeded. The world became brighter after that enlightenment of Edison.

From then onwards, the untiring efforts by scientists have contributed advanced  technology in each decade and the methods of lighting have gone to unimaginable heights. We have replaced the bulbs. The fluorescent lamps, incandescent lamps etc are glowing now with each next invention achieving efficiency and savings.

Now, we are interested on how much lumens per watt can glow for getting most out of our precious electricity. The flux per unit of input power  is 16 for a filament bulb, 70 for a fluorescent lamp but  it is 300 for a LED based lamp.

LED is made of semi conductors. When voltage is applied, the electrons fit into electron holes emitting photons and thus light. Earlier, only Red LED and Green LED were available. The search for blue LED was carried on for many decades for want of a suitable material. The search has taken more time than the search for a suitable filament by Edison.

Now, the Nobel Prize is awarded for invention of Blue LED. With the complete availability of the basic colours of Red, Green and Blue (RBG), the combination can produce white light. Further, a wide range of colours can be obtained by changing the mix proportion of RBG.

For household applications, LED lamps or tubes can be fit into the existing light fittings or a newer fitting can be adopted. Like any other technology, initial costs currently work out to be expensive. But, the savings in energy in the long run will compensate the initial costs.

The future is reserved for LED  lighting making other kinds of lighting obsolete. These Japanese origin scientists are really proving that Japan is the land where the Sun rises as far as this planet is concerned. Again we congratulate the winners and thank the inventors.





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