LED emerges as an efficient and energy-saving alternative to conventional incandescent or fluorescent light sources for meeting the
ever-escalating demand for more lighting in more places and to improve
the bulbs used in sports stadiums, car headlights and street lamps.
With all the advantages, LED is also facing a challenge that its
efficiency falls as operating current rises, making it too hot
to power in large-scale applications.
Researchers at University of
California, Santa Barbara, led by material scientists Kristin A. Denault
and Michael Cantore, have come out with an alternative to LED technology using laser diode, combining with inorganic phosphors, to create
high-power white light source.
The laser-based lighting devices are high in
efficiency and high in performance metrics, according to the study. The team used 2 methods to create white light.
(1) Using blue laser diode and yellow-emitting phosphor
powder.
(2) Using a
near-ultra-violet laser diode and a combination of red-, green-, and
blue-emitting phosphors.
With these technologies, the team is able to achieve variety of other
color temperatures with high color rendition, broadening the range of
applications for these new lights.
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