Spectroscopic insights into the performance of quantum dot light-emitting diodes

Title
Spectroscopic insights into the performance of quantum dot light-emitting diodes
Authors
배완기Sergio BrovelliVictor I. Klimov
Keywords
Quantum Dot; Light-Emitting Diodes; Auger Recombination; Spectroscopy; Multicarrier; Photoluminescence; Electroluminescence
Issue Date
2013-09
Publisher
MRS bulletin
Citation
VOL 38, 721-730
Abstract
Lighting consumes almost one-fi fth of all electricity generated today. In principle, with more effi cient light sources replacing incandescent lamps, this demand can be reduced at least twofold. A dramatic improvement in lighting effi ciency is possible by replacing traditional incandescent bulbs with light-emitting diodes (LEDs) in which current is directly converted into photons via the process of electroluminescence. The focus of this article is on the emerging technology of LEDs that use solution-processed semiconductor quantum dots (QDs) as light emitters. QDs are nano-sized semiconductor particles whose emission color can be tuned by simply changing their dimensions. They feature near-unity emission quantum yields and narrow emission bands, which result in excellent color purity. Here, we review spectroscopic studies of QDs that address the problem of nonradiative carrier losses in QD-LEDs and approaches for its mitigation via the appropriate design of QD emitters. An important conclusion of our studies is that the realization of high-performance LEDs might require a new generation of QDs that in addition to being effi cient single-exciton emitters would also show high emission effi ciency in the multicarrier regime.
URI
http://pubs.kist.re.kr/handle/201004/45899
ISSN
08837694
Appears in Collections:
KIST Publication > ETC
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