New discovery may open the door for energy-efficient lighting

thecheers.org    2008-07-16 13:28:22    

London, July 16 : Scientists at the University of Michigan and Princeton University have devised a way to deliver significantly more bright light from a watt than incandescent bulbs.
Scientists at the University of Michigan and Princeton University have devised a way to deliver significantly more bright light from a watt than incandescent bulbs.

"Our demonstration here shows that OLEDs are a very exciting technology for use in interior illumination," Nature Photonics quoted Stephen Forrest, U-M professor of electrical engineering and physics and vice president for research, as saying.

"We hope that white emitting OLEDs will play a major role in the world of energy conservation," he added.

Forrest and co-author Yuri Sun, visiting U-M from Princeton University, say that the new generation of lighting called white organic light-emitting devices (WOLED) show promise of providing a light that's much easier to manipulate, while being long lasting and able to provide in different shapes, from panels to bulbs and more.

WOLEDs generate white light by using electricity to send an electron into nanometer thick layers of organic materials that serve as semiconductors.

The carbon-based materials are dyes, the ones used in photographic prints and car paint, so they are very inexpensive, and can be put on plastic sheets or metal foils, further reducing costs.

The excited electron in such layers casts bright white light.

Forrest pointed out that the bad news had been that nearly 60 per cent of it would be trapped inside the layers, much the way light under water reflects back into the pool, making the water surface seem like a mirror when viewed from underneath.

In their research paper, the researchers describe a tandem system of organic grids and micro lenses that guide the light out of the thin layers and into the air.

They say that the grids refract the trapped light, bouncing it into a layer of dome-shaped lenses that then pull the light out.

According to the researchers, this process can emit about 70 lumens from a single watt of power.

"If you can change the light efficiency by just a few percentage points, there's a few less coal plants you'll need," Forrest said.

Gary Was, the director of U-M's Michigan Memorial Phoenix Energy Institute, said that the WOLED work is one example of how science can open new doors in conservation, said Gary Was, institute director.

"That energy efficient lighting can be made from the same materials as car paint and that they can be made in such thin, formable sheets boggles the mind. This is one of many exciting creations that research is giving us in the pursuit of energy efficiency. This is also the kind of innovation that is required in the drive for energy sustainability," Was said.

Forrest said that WOLEDs could be framed in different forms.

"Plugging into a wall at low voltage, putting it on a flexible metal foil, or on plastic that won't break when you drop it. This is what makes it so fun because it's such a unique lighting source," Forrest said.

He said that the next challenge was to reduce the cost to be commercially competitive.

"You have to be able to do this dirt cheap. People don't spend much for their light bulbs," Forrest said. (ANI)
© 2007 ANI


TAGS: Science   


more
Why the veggie burger tastes just as good as a non-veg one

While a scrumptious non-veggie burger may be treat for your taste buds, the taste for meat could be based in part on expectation rather than reality, says a new study led by an Indian researcher, which shows that personal values deceive taste buds.

Scientists to drill into a crack in the edge of the world

An international consortium of scientists is preparing to drill into a crack in the edge of the world - the South Island's Alpine Fault in New Zealand.

US warrant surrendering Dr. Death to Oz Police imminent
18.Jul 2008
Ending a three-year quest to bring controversial In...read

Icebergs scouring ocean seabed could have severe effects on marine creatures
18.Jul 2008
New data has suggested that due to an increase in ...read

Humming fish gives clues to the origins of vocalization
18.Jul 2008
A male midshipman - a close relative of the toadfi...read



"Assisted migration of species" necessary for saving wildlife from global warming

Antarctica and North America may once have been connected

Indian-origin researchers find way to create heat pumps, energy converters from 'nanosculpture'

NASA's Deep Impact films Earth as an alien world

Men and women really do have different brains