June 15, 2009
Molecular pair promises cheap
the right blue molecule to the right orange molecule and you have
the key ingredient for inexpensive white light-emitting devices.
Separately, one molecule emits blue light and the other molecule
emits orange light. Together they emit white light because blue and
orange are complementary colors. Previous attempts to mate complementary
color molecules have run into trouble because some energy moves from
the higher energy blue molecule to the lower energy orange molecule,
which throws off the color balance.
The two molecules are a special type that cycle energy within
themselves in a way that causes a mismatch between the molecules that
blocks energy from passing between them.
The molecular pair was used to make a prototype white organic
light-emitting device. White light emitting devices use less energy
and are more natural looking than compact fluorescent light bulbs,
but they're more expensive. The blue-orange molecular pair promises
to lower the cost of white LEDs.
Molecule: Frustrated Energy Transfer between Constituent Emitting
Journal of the American Chemical Society, published online
May 29, 2009
Related stories and briefs:
white LEDs on deck -- related research
Back to ERN June 15, 2009
Energy-related books and products