Highly efficient quantum dot near-infrared light-emitting diodes

Xiwen Gong, Zhenyu Yang, Grant Walters, Riccardo Comin, Zhijun Ning, Eric Beauregard, Valerio Adinolfi, Oleksandr Voznyy, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

363 Scopus citations

Abstract

Colloidal quantum dots (CQDs) are emerging as promising materials for constructing infrared sources in view of their tunable luminescence, high quantum efficiency and compatibility with solution processing. However, CQD films available today suffer from a compromise between luminescence efficiency and charge transport, and this leads to unacceptably high power consumption. Here, we overcome this issue by embedding CQDs in a high-mobility hybrid perovskite matrix. The new composite enhances radiative recombination in the dots by preventing transport-assisted trapping losses; yet does so without increasing the turn-on voltage. Through compositional engineering of the mixed halide matrix, we achieve a record electroluminescence power conversion efficiency of 4.9%. This surpasses the performance of previously reported CQD near-infrared devices two-fold, indicating great potential for this hybrid QD-in-perovskite approach.
Original languageEnglish (US)
Pages (from-to)253-+
Number of pages252
JournalNature Photonics
Volume10
Issue number4
DOIs
StatePublished - Feb 22 2016
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-05-31
Acknowledged KAUST grant number(s): KUS-11-009-21
Acknowledgements: This publication is based in part on work supported by an award (KUS-11-009-21) from the King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. X.G. thanks Mitacs for a Globalink Graduate Fellowship Award. The authors thank L. Levina for assistance in CQD synthesis; X. Lan, E. Yassitepe and F. Fan for acquiring microscopic images; and E. Palmiano, R. Wolowiec, and D. Kopilovic for their help during the course of study.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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