Improving the Performance of Quantum Dot Light-Emitting Diodes through Nanoscale Engineering

Title
Improving the Performance of Quantum Dot Light-Emitting Diodes through Nanoscale Engineering
Authors
Jeffrey M. Pietryga배완기Young-Shin ParkIstvan RobelVictor I. Klimov
Issue Date
2014-03
Publisher
ECS Transactions
Citation
VOL 61, NO 5, 75-85
Abstract
Despite tremendous progress since the first demonstration of QDbased light-emitting diodes (QD-LEDs) there is substantial room for improvement in performance, particularly at high current densities. Here we analyze the role of Auger recombination in the performance of QD-LEDs by conducting a systematic characterization of device performance in conjunction with timeresolved spectroscopic studies of photoexcited carriers directly within the device structure. We use a series of structurally engineered core/shell QDs that exhibit very similar single-exciton properties, but distinctly different rates of non-radiative Auger recombination to show that both QD-LED efficiency and the onset for efficiency roll-off are strongly influenced by Auger recombination. Finally, we demonstrate that device efficiency can be improved by either reducing Auger recombination rates, or by improving charge-injection balance, both of which can be accomplished through engineering of the QD structure.
URI
http://pubs.kist.re.kr/handle/201004/47832
ISSN
19386737
Appears in Collections:
KIST Publication > Article
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