World’s first pure white LED
Energy-efficient light-emitting diodes (LEDs) are projected as the predominant lighting source of the future, replacing the incandescent bulbs as well as compact fluorescent lights (CFLs). But, LEDs do not naturally produce white light, and getting them to look like they do adds to their production cost, making them much more expensive than an average incandescent bulb or compact flourecent lamp also, the quality of their light output is not that good.
soo-young Park at Seoul National Univesity, South Korea, and colleagres at the University of Vaiercia in Spain, haveengineered a molecule that combines two light-emitting materials, orange and blue, to produce a white light in the visible light spectrum. This single molecule behaves like two separate light-producing molecules — when stimulated with a voltage, it produces orange and blue light that mix to create white. A large population of the molecules reliably produces equal quantities of orange and blue light that mix to produce an even white.
The new form of LED molecule is said to be efficient, colour stable and reproducible, making it an ideal candidate for use in LED lighting.