It is claimed from Korea Researchers that the world’s first purely white LED (light-emitting diode) has been produced in Korea.
Soo-Young Park, a professor of organic materials for photonics at the
Department of Materials Science and Engineering at Seoul National
University in Korea, led the group, which includes researchers from the
University of Valencia in Spain.
LEDs are much more energy-efficient than incandescent or compact
fluorescent lightng (CFL), but the quality of light they can give a room
is up for debate.
Because LEDs do not naturally produce white light, getting them to
look like they do adds to their production cost, making them much more
expensive than your average incandescent or CFL. Many companies have
been trying to come up with different LED recipes and components to
produce a nice white light, while keeping the consumer cost down.
Park and his group claim to have engineered a molecule with one
orange and one blue light-emitting material that produces a white light
in the visible light spectrum when put together.
In other words, they say they’ve invented a white-light-emitting diode.
Repeated laboratory tests apparently showed that the new form of LED
molecule is efficient, color stable, and able to be reproduced again and
again, making it a legitimate candidate for use in LED lighting.
A detailed explanation of the group’s molecular work can be found in
the current issue of Journal of the American Chemical Society.
According to Mr.Park and his group in their paper, an ideal material
for a white-light source should be cost-effective, stable, robust, emit
over the whole visible spectrum, not suffer from self-absorption, and
its pure color should be easily reproducible. With this goal in mind, we
have successfully synthesized and characterized, for the first time, a
white-light-emitting single molecule dyad, consisting of two
noninteracting chromophores showing excited-state intramolecular proton
transfer.
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