Bright colloidal quantum dot light-emitting diodes enabled by efficient chlorination /639/925 /639/638/542 article

Xiyan Li; Yong Biao Zhao; Fengjia Fan; Larissa Levina; Min Liu; Rafael Quintero-Bermudez; Xiwen Gong; Li Na Quan; James Fan; Zhenyu Yang; Sjoerd Hoogland; Oleksandr Voznyy; Zheng Hong Lu; Edward H. Sargent

doi:10.1038/s41566-018-0105-8

Bright colloidal quantum dot light-emitting diodes enabled by efficient chlorination /639/925 /639/638/542 article

Xiyan Li, Yong Biao Zhao, Fengjia Fan^*, Larissa Levina, Min Liu, Rafael Quintero-Bermudez, Xiwen Gong, Li Na Quan, James Fan, Zhenyu Yang, Sjoerd Hoogland, Oleksandr Voznyy, Zheng Hong Lu, Edward H. Sargent

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

354 Scopus citations

Abstract

The external quantum efficiencies of state-of-the-art colloidal quantum dot light-emitting diodes (QLEDs) are now approaching the limit set by the out-coupling efficiency. However, the brightness of these devices is constrained by the use of poorly conducting emitting layers, a consequence of the present-day reliance on long-chain organic capping ligands. Here, we report how conductive and passivating halides can be implemented in Zn chalcogenide-shelled colloidal quantum dots to enable high-brightness green QLEDs. We use a surface management reagent, thionyl chloride (SOCl₂), to chlorinate the carboxylic group of oleic acid and graft the surfaces of the colloidal quantum dots with passivating chloride anions. This results in devices with an improved mobility that retain high external quantum efficiencies in the high-injection-current region and also feature a reduced turn-on voltage of 2.5 V. The treated QLEDs operate with a brightness of 460,000 cd m^-2, significantly exceeding that of all previously reported solution-processed LEDs.

Original language	English (US)
Pages (from-to)	159-164
Number of pages	6
Journal	Nature Photonics
Volume	12
Issue number	3
DOIs	https://doi.org/10.1038/s41566-018-0105-8
State	Published - Mar 1 2018

Funding

This publication is based in part on work supported by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. The authors thank B. Sun, M. Liu, M. Burgelman, P.-C. Li and R. Munir for their help during the course of study.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics

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10.1038/s41566-018-0105-8

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title = "Bright colloidal quantum dot light-emitting diodes enabled by efficient chlorination /639/925 /639/638/542 article",

abstract = "The external quantum efficiencies of state-of-the-art colloidal quantum dot light-emitting diodes (QLEDs) are now approaching the limit set by the out-coupling efficiency. However, the brightness of these devices is constrained by the use of poorly conducting emitting layers, a consequence of the present-day reliance on long-chain organic capping ligands. Here, we report how conductive and passivating halides can be implemented in Zn chalcogenide-shelled colloidal quantum dots to enable high-brightness green QLEDs. We use a surface management reagent, thionyl chloride (SOCl2), to chlorinate the carboxylic group of oleic acid and graft the surfaces of the colloidal quantum dots with passivating chloride anions. This results in devices with an improved mobility that retain high external quantum efficiencies in the high-injection-current region and also feature a reduced turn-on voltage of 2.5 V. The treated QLEDs operate with a brightness of 460,000 cd m-2, significantly exceeding that of all previously reported solution-processed LEDs.",

author = "Xiyan Li and Zhao, {Yong Biao} and Fengjia Fan and Larissa Levina and Min Liu and Rafael Quintero-Bermudez and Xiwen Gong and Quan, {Li Na} and James Fan and Zhenyu Yang and Sjoerd Hoogland and Oleksandr Voznyy and Lu, {Zheng Hong} and Sargent, {Edward H.}",

note = "Funding Information: This publication is based in part on work supported by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. The authors thank B. Sun, M. Liu, M. Burgelman, P.-C. Li and R. Munir for their help during the course of study. Publisher Copyright: {\textcopyright} 2018 The Author(s).",

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AU - Liu, Min

AU - Quintero-Bermudez, Rafael

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AU - Hoogland, Sjoerd

AU - Voznyy, Oleksandr

AU - Lu, Zheng Hong

AU - Sargent, Edward H.

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PY - 2018/3/1

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N2 - The external quantum efficiencies of state-of-the-art colloidal quantum dot light-emitting diodes (QLEDs) are now approaching the limit set by the out-coupling efficiency. However, the brightness of these devices is constrained by the use of poorly conducting emitting layers, a consequence of the present-day reliance on long-chain organic capping ligands. Here, we report how conductive and passivating halides can be implemented in Zn chalcogenide-shelled colloidal quantum dots to enable high-brightness green QLEDs. We use a surface management reagent, thionyl chloride (SOCl2), to chlorinate the carboxylic group of oleic acid and graft the surfaces of the colloidal quantum dots with passivating chloride anions. This results in devices with an improved mobility that retain high external quantum efficiencies in the high-injection-current region and also feature a reduced turn-on voltage of 2.5 V. The treated QLEDs operate with a brightness of 460,000 cd m-2, significantly exceeding that of all previously reported solution-processed LEDs.

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Bright colloidal quantum dot light-emitting diodes enabled by efficient chlorination /639/925 /639/638/542 article

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