Japanese Genius Trio Wins Nobel—hope of better illumination comes real
Shuji Nakamura, earlier had been just another scientist with a “hopeless project” as labelled by his employer. So, in order to pursue it, he chose spare time. But it proved people wrong, as it always did in the history of innovations, as one call woke him up at the dead of night and announced that he was to receive world’s most prestigious prize for it! Akasaki, Amano and Nakamura—have been awarded 2014 Nobel Prize for Physics for their ground-breaking invention of “Blue Light-Emitting Diodes”.
So, how Efficient is the Latest Blue LED really to bag a Nobel?
- Traditional lightbulbs that we have been using since the 18th century are inefficient. How they work is by heating up the flimsy filament inside. It is literally a waste of energy as a substantial amount of heat is lost during this conversion. Fluorescents are more economical, in comparison, but nothing comes close to LED. Digital Electronics videos Tutorial shows that an LED produces light as negative electrons get hooked to “positive holes” It happens in the paper-thin semiconductor layer.
Scientists stuck to endless experiments for decades but failed to produce blue-light—the one with the highest detectable frequencies—which if converted into light will turn in more energy-saving that burns brighter with less power consumption. LED advantage is singularly outstanding! While the 19th century light-bulbs shone with 16 Lumen/Watt, the 20th century Fluorescent beat it with 70 Lumen per watt. Digital Electronics videos Tutorial illustrates with diagram that a LED glows with 300 Lumens! Blue LED has been just a distant dream for long. Now it has indisputably turned into reality.
- Why has it been the stumbling point that blocked the path of energy-efficient Blue LED? While red LED already came to the market around 1960 and lit up digital watches and calculators, scientists kept brainstorming for a better solution. Something more cost-effective and powerful. Green and Red LED possess long and medium wavelength. The hardest part of the experiment was to find a material that would emit light with wavelength as short as blue. No one knew how to modify gallium nitride crystal to coax blue light. But these 3 Physics heroes cracked the hitch by sapphire coating aluminium nitride. What this digital electronics experiment did is to usher in a new era of light.