University of Utah physicists suggest it will be more difficult than thought to make highly efficient OLED, as findings hint such LEDs would convert no more than 25% of electricity into light rather than heat, contrary to earlier estimates of up to 63%.
A 2001 Nature paper by other University of Utah physicists suggested it might be possible to make OLEDs that converted 41% to 63% of incoming electricity into light. But the new study suggests 25% efficiency may be correct at least for the organic polymer studied pure MEH-PPV and possibly for others.
"Doping" organic semiconductors with other chemicals someday might lead to organic LED efficiencies above 25%, but Boehme says he is skeptical.
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Posted: Aug 18,2008 by Ron Mertens
