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More Light, Less Energy
ASEE Prism, Sep 2006 by Grose, Thomas K
ELECTRICAL
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NOW HERE'S A bright idea: super-efficient light bulbs that require less energy to burn bright. Most of today's incandescent light bulbs have an efficiency of about 15 lumens per watt, University of Michigan engineer Stephen Forrest notes in a recent article he wrote. But his team at Michigan (where he's also vice president for research) has lab tested a bulb that reaches nearly 30 lumens per watt, and the team thinks 50 or 60 lumens are possible. Twenty-one years ago, researchers in a Kodak lab devised light-emitting devices that used thin films of fluorescent organic molecules. To make them work, they needed to be injected with electrons from electrical contacts on the surface of the film. But only one in four of the electrons produced light, so the organic light-emitting devices (OLEDs) were not very efficient. When Forrest was at Princeton University in 1998, he was part of a group that got all of the electrons to produce light by adding a heavy-metal atom to the mix. Now Forrest's Michigan group has combined OLEDs with conventional fluorescence to create a device that's twice as effective as today's interior lights. Forrest concludes that "OLEDs may play a vital role in the effort" to reduce energy use with more-efficient lighting. -TG
Copyright American Society for Engineering Education Sep 2006
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