UM
The work mechanism and sub-bandgap-voltage electroluminescence in inverted quantum dot light-emitting diodes
Ji W.2; Jing P.1; Zhang L.1; Li D.2; Zeng Q.2; Qu S.1; Zhao J.1
2014
Source PublicationScientific Reports
ISSN20452322
Volume4
AbstractThrough introducing a probe layer of bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium (FIrpic) between QD emission layer and 4, 4-N, N-dicarbazole-biphenyl (CBP) hole transport layer, we successfully demonstrate that the electroluminescence (EL) mechanism of the inverted quantum dot light-emitting diodes (QD-LEDs) with a ZnO nanoparticle electron injection/transport layer should be direct charge-injection from charge transport layers into the QDs. Further, the EL from QD-LEDs at sub-bandgap drive voltages is achieved, which is in contrast to the general device in which the turn-on voltage is generally equal to or greater than its bandgap voltage (the bandgap energy divided by the electron charge). This sub-bandgap EL is attributed to the Auger-Assisted energy up-conversion hole-injection process at the QDs/organic interface. The high energy holes induced by Auger-Assisted processes can be injected into the QDs at sub-bandgap applied voltages. These results are of important significance to deeply understand the EL mechanism in QD-LEDs and to further improve device performance.
DOI10.1038/srep06974
URLView the original
Language英語
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Cited Times [WOS]:42   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Jilin Normal University
2.Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Ji W.,Jing P.,Zhang L.,et al. The work mechanism and sub-bandgap-voltage electroluminescence in inverted quantum dot light-emitting diodes[J]. Scientific Reports,2014,4.
APA Ji W..,Jing P..,Zhang L..,Li D..,Zeng Q..,...&Zhao J..(2014).The work mechanism and sub-bandgap-voltage electroluminescence in inverted quantum dot light-emitting diodes.Scientific Reports,4.
MLA Ji W.,et al."The work mechanism and sub-bandgap-voltage electroluminescence in inverted quantum dot light-emitting diodes".Scientific Reports 4(2014).
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