Origin of Efficiency Roll-Off in Colloidal Quantum-Dot Light-Emitting Diodes
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Bulovic_Origin of efficiency.pdf
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Author(s)
Shirasaki, Yasuhiro
Supran, Geoffrey J
Tisdale, William
Bulovic, Vladimir
Date Issued
May 2013
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
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.
MIT 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
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.217403
