Hey, Mark! - 10/07/14 05:02 PM
Nobel prize in physics this year is right up your alley:
http://arstechnica.com/science/2014/10/blue-leds-given-nobel-prize-in-physics/#p3
http://arstechnica.com/science/2014/10/blue-leds-given-nobel-prize-in-physics/#p3