Exciton control enables high-performance colloidal quantum well light-emitting diodes

Two-dimensional (2D) nanocrystals are promising for optoelectronic and microelectronic technologies. However, the performance of 2D nanocrystal light-emitting diodes (LEDs) remains limited. Here, exciton dynamics are rationally controlled by both shell engineering and device engineering, obtaining c...

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Main Authors: Hu, Sujuan, Xiang, Wenbin, Liu, Baiquan, Zhang, Lingjiao, Zhang, Genghui, Guo, Min, Yang, Jinhu, Ren, Yunfei, Yu, Junhong, Yang, Zhenyu, Gao, Huayu, Wang, Jing, Xue, Qifan, Yeung, Fion Sze Yan, Zhang, Jiayu, Kwok, Hoi Sing, Liu, Chu
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/181745
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1817452024-12-20T15:42:36Z Exciton control enables high-performance colloidal quantum well light-emitting diodes Hu, Sujuan Xiang, Wenbin Liu, Baiquan Zhang, Lingjiao Zhang, Genghui Guo, Min Yang, Jinhu Ren, Yunfei Yu, Junhong Yang, Zhenyu Gao, Huayu Wang, Jing Xue, Qifan Yeung, Fion Sze Yan Zhang, Jiayu Kwok, Hoi Sing Liu, Chu School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences School of Materials Science and Engineering LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays Engineering Colloidal quantum wells Exciton dynamics Two-dimensional (2D) nanocrystals are promising for optoelectronic and microelectronic technologies. However, the performance of 2D nanocrystal light-emitting diodes (LEDs) remains limited. Here, exciton dynamics are rationally controlled by both shell engineering and device engineering, obtaining colloidal quantum well LEDs (CQW-LEDs) with superior performance. The formation of CQW films on charge transport layers shows an excellent photoluminescence quantum yield of 76.63%. An unreported relationship among Auger lifetime, electron confinement energy, and external quantum efficiency (EQE) in 2D nanocrystal devices is directly observed. The optimized CQW-LEDs possess a maximum power efficiency of 6.04 lm W−1 and a current efficiency of 9.20 cd A−1, setting record efficiencies for 2D nanocrystal red LEDs. Additionally, a remarkable EQE of 13.43% has been achieved, accompanied by an exceptionally low efficiency roll-off. Significantly, EQE for flexible CQW-LEDs is 42-fold higher than the previous best results. Furthermore, active-matrix CQW-LEDs on printed circuit boards are developed. The findings not only unlock new possibilities for controlling exciton dynamics but also provide an alternative strategy to achieve high-performance 2D nanocrystal based applications. Published version This work was supported by the National Natural Science Foundation of China (Grant No. 62104265), the Science and Technology Planning Project of Guangdong Province (Nos. 2023B1515120046 and 2023B1212060025), the Program for Guangdong High-Level Talents (2021QN02X053), the Guangdong Innovation and Entrepreneurship Team Project (Grant No. 2021ZT09X070), the Science and Technology Program of Guangdong Province (Grant No. 2021A0505110009), and the Innovation and Technology Fund (Grant No. GHP/006/20GD). 2024-12-16T08:11:43Z 2024-12-16T08:11:43Z 2024 Journal Article Hu, S., Xiang, W., Liu, B., Zhang, L., Zhang, G., Guo, M., Yang, J., Ren, Y., Yu, J., Yang, Z., Gao, H., Wang, J., Xue, Q., Yeung, F. S. Y., Zhang, J., Kwok, H. S. & Liu, C. (2024). Exciton control enables high-performance colloidal quantum well light-emitting diodes. Applied Physics Reviews, 11(2), 021428-. https://dx.doi.org/10.1063/5.0206176 1931-9401 https://hdl.handle.net/10356/181745 10.1063/5.0206176 2-s2.0-85197590331 2 11 021428 en Applied Physics Reviews © 2024 Author(s). Published under an exclusive license by AIP Publishing. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1063/5.0206176 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Colloidal quantum wells
Exciton dynamics
spellingShingle Engineering
Colloidal quantum wells
Exciton dynamics
Hu, Sujuan
Xiang, Wenbin
Liu, Baiquan
Zhang, Lingjiao
Zhang, Genghui
Guo, Min
Yang, Jinhu
Ren, Yunfei
Yu, Junhong
Yang, Zhenyu
Gao, Huayu
Wang, Jing
Xue, Qifan
Yeung, Fion Sze Yan
Zhang, Jiayu
Kwok, Hoi Sing
Liu, Chu
Exciton control enables high-performance colloidal quantum well light-emitting diodes
description Two-dimensional (2D) nanocrystals are promising for optoelectronic and microelectronic technologies. However, the performance of 2D nanocrystal light-emitting diodes (LEDs) remains limited. Here, exciton dynamics are rationally controlled by both shell engineering and device engineering, obtaining colloidal quantum well LEDs (CQW-LEDs) with superior performance. The formation of CQW films on charge transport layers shows an excellent photoluminescence quantum yield of 76.63%. An unreported relationship among Auger lifetime, electron confinement energy, and external quantum efficiency (EQE) in 2D nanocrystal devices is directly observed. The optimized CQW-LEDs possess a maximum power efficiency of 6.04 lm W−1 and a current efficiency of 9.20 cd A−1, setting record efficiencies for 2D nanocrystal red LEDs. Additionally, a remarkable EQE of 13.43% has been achieved, accompanied by an exceptionally low efficiency roll-off. Significantly, EQE for flexible CQW-LEDs is 42-fold higher than the previous best results. Furthermore, active-matrix CQW-LEDs on printed circuit boards are developed. The findings not only unlock new possibilities for controlling exciton dynamics but also provide an alternative strategy to achieve high-performance 2D nanocrystal based applications.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Hu, Sujuan
Xiang, Wenbin
Liu, Baiquan
Zhang, Lingjiao
Zhang, Genghui
Guo, Min
Yang, Jinhu
Ren, Yunfei
Yu, Junhong
Yang, Zhenyu
Gao, Huayu
Wang, Jing
Xue, Qifan
Yeung, Fion Sze Yan
Zhang, Jiayu
Kwok, Hoi Sing
Liu, Chu
format Article
author Hu, Sujuan
Xiang, Wenbin
Liu, Baiquan
Zhang, Lingjiao
Zhang, Genghui
Guo, Min
Yang, Jinhu
Ren, Yunfei
Yu, Junhong
Yang, Zhenyu
Gao, Huayu
Wang, Jing
Xue, Qifan
Yeung, Fion Sze Yan
Zhang, Jiayu
Kwok, Hoi Sing
Liu, Chu
author_sort Hu, Sujuan
title Exciton control enables high-performance colloidal quantum well light-emitting diodes
title_short Exciton control enables high-performance colloidal quantum well light-emitting diodes
title_full Exciton control enables high-performance colloidal quantum well light-emitting diodes
title_fullStr Exciton control enables high-performance colloidal quantum well light-emitting diodes
title_full_unstemmed Exciton control enables high-performance colloidal quantum well light-emitting diodes
title_sort exciton control enables high-performance colloidal quantum well light-emitting diodes
publishDate 2024
url https://hdl.handle.net/10356/181745
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