期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.217403
关键词
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资金
- DOE Excitonics Center
- Energy Frontiers Research Center
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0001088]
- National Science Foundation [DMR-08-19762]
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.
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