Electroluminescence efficiency enhancement in quantum dot light-emitting diodes by embedding a silver nanoisland layer
Hernandez-Martinez, P. L.
Demir, Hilmi Volkan
Sun X. W.
Advanced Optical Materials
1439 - 1445
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A colloidal quantum dot light-emitting diode (QLED) is reported with substantially enhanced electroluminescence by embedding a thin layer of Ag nanoislands into hole transport layer. The maximum external quantum efficiency (EQE) of 7.1% achieved in the present work is the highest efficiency value reported for green-emitting QLEDs with a similar structure, which corresponds to 46% enhancement compared with the reference device. The relevant mechanisms enabling the EQE enhancement are associated with the near-field enhancement via an effective coupling between excitons of the quantum dot emitters and localized surface plasmons around Ag nano-islands, which are found to lead to good agreement between the simulation results and the experimental data, providing us with a useful insight important for plasmonic QLEDs. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Semiconductor quantum dots
Colloidal quantum dots
External quantum efficiency
Localized surface plasmon
Quantum-dot light emitting diodes
Light emitting diodes
Published Version (Please cite this version)http://dx.doi.org/10.1002/adom.201500172
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