![]() ![]() World Policy Journal editor and publisher David A. One of them was Hiroshi Amano, a professor at Nagoya University located on Japan’s Pacific Coast. For their efforts, last year, all three were awarded the Nobel Prize for Physics. Until one day, following years of effort, three extraordinary Japanese scientists stumbled on the way to make blue. And for nearly four decades, this eluded scientists. The third vital color, if they were to be combined into a bulb that emitted white light, was blue. But scientists continued working and eventually came up with the process of electroluminescence, and in turn light-emitting diodes or LEDs.įor nearly three decades, though, there were only two types of LEDs-red and green. ![]() ![]() Along came the next phase-fluorescent lights, with their own set of problems. It used, indeed wasted, a lot of electricity, generated heat, and had to be thrown away once it burned out in a relatively short time. It was effective in terms of turning night into daylight, but most inefficient in virtually every other way. For nearly a hundred years, the incandescent bulb-which worked mainly by electricity passing through a filament and heating it to incandescent temperatures in a glass globe-lit up the world. In 1879, Thomas Edison invented the light bulb.
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