Korean researchers have developed a new, simpler white LED that shows promise as a more efficient and stable source of pure white light for improved illumination of homes and offices. The new approach yielded what the scientists describe as the most efficient and stable source of pure white light ever achieved.

Soo Young Park and colleagues note that white LEDs show promise as a brighter, longer-lasting and more energy-efficient light source than conventional lighting. But scientists have had difficulty producing white LEDs that are suitable for practical use. Existing technologies produce tinted shades of white light, require complex components, and become unstable over time.

The researchers describe development of a new, simpler white LED that is the first to achieve stable white light emissions using a single molecule. Their specially engineered molecule combines two light-emitting materials, one orange and one blue, which together produce white light over the entire visible range. In laboratory studies, the scientists showed that light production from an LED using the new molecule was highly efficient and had excellent color stability and reproducibility, features that make it a practical white light source.

Journal reference:
A White-Light-Emitting Molecule: Frustrated Energy Transfer between Constituent Emitting Centers. Journal of the American Chemical Society, 2009; 090610145759060 DOI: 10.1021/ja902533f