The invention of the blue LED was a significant breakthrough because it enabled the creation of white light sources by combining blue light with yellow phosphors, or by mixing red, green, and blue light. Red and green LEDs had been developed much earlier, but a blue LED was necessary to achieve energy-efficient white lighting and color displays.
2014 Nobel award in Physics is associated with the invention of which type of LED?
Asked in WBPSC CS Prelims 2015 · Topic: Scientists & Inventions (Invention of the Laser and its Principles)
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