All-Quantum-Dot Infrared Light-Emitting Diodes

Zhenyu Yang, Oleksandr Voznyy, Mengxia Liu, Mingjian Yuan, Alexander H. Ip, Osman S. Ahmed, Larissa Levina, Sachin Kinge, Sjoerd Hoogland, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

© 2015 American Chemical Society. Colloidal quantum dots (CQDs) are promising candidates for infrared electroluminescent devices. To date, CQD-based light-emitting diodes (LEDs) have employed a CQD emission layer sandwiched between carrier transport layers built using organic materials and inorganic oxides. Herein, we report the infrared LEDs that use quantum-tuned materials for each of the hole-transporting, the electron-transporting, and the light-emitting layers. We successfully tailor the bandgap and band position of each CQD-based component to produce electroluminescent devices that exhibit emission that we tune from 1220 to 1622 nm. Devices emitting at 1350 nm achieve peak external quantum efficiency up to 1.6% with a low turn-on voltage of 1.2 V, surpassing previously reported all-inorganic CQD LEDs.
Original languageEnglish (US)
Pages (from-to)12327-12333
Number of pages7
JournalACS Nano
Volume9
Issue number12
DOIs
StatePublished - Nov 20 2015
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-11-009-21
Acknowledgements: This publication is based in part on work supported by Award KUS-11-009-21, from 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 of Canada (NSERC). Computations were performed on the GPC supercomputer at the SciNet HPC Consortium. SciNet is funded by the Canada Foundation for Innovation under the auspices of Compute Canada; the Government of Ontario; Ontario Research Fund - Research Excellence; and the University of Toronto. The authors thank Z. Ning, X. Lan, R. Wolowiec, D. Kopilovic, and E. Palmiano for their help and useful discussions.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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