Origin of Efficiency Roll-Off in Colloidal Quantum-Dot Light-Emitting Diodes

Author(s)
Shirasaki, Yasuhiro; Supran, Geoffrey J; Tisdale, William; Bulovic, Vladimir
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Abstract
We study the origin of efficiency roll-off (also called “efficiency droop”) in colloidal quantum-dot light-emitting diodes through the comparison of quantum-dot (QD) electroluminescence and photoluminescence. We find that an electric-field-induced decrease in QD luminescence efficiency—and not charge leakage or QD charging (Auger recombination)—is responsible for the roll-off behavior, and use the quantum confined Stark effect to accurately predict the external quantum efficiency roll-off of QD light-emitting diodes.
Date issued
2013-05
URI
http://hdl.handle.net/1721.1/110780
Department
Massachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Shirasaki, Yasuhiro; Supran, Geoffrey J.; Tisdale, William A. et al. “Origin of Efficiency Roll-Off in Colloidal Quantum-Dot Light-Emitting Diodes.” Physical Review Letters 110, 21 (May 2013): 217403 © 2013 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114
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