High-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics

Colloidal quantum wells (CQWs) have emerged as a promising family of two-dimensional (2D) optoelectronic materials with outstanding properties, including ultranarrow luminescence emission, nearly unity quantum yield, and large extinction coefficient. However, the performance of CQWs-based light-emit...

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Main Authors: Hu, Sujuan, Shabani, Farzan, Liu, Baiquan, Zhang, Lingjiao, Guo, Min, Lu, Guanhua, Zhou, Zhisheng, Wang, Jing, Huang, Jacob C., Min, Yonggang, Xue, Qifan, Demir, Hilmi Volkan, Liu, Chuan
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/163389
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1633892022-12-05T06:50:42Z High-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics Hu, Sujuan Shabani, Farzan Liu, Baiquan Zhang, Lingjiao Guo, Min Lu, Guanhua Zhou, Zhisheng Wang, Jing Huang, Jacob C. Min, Yonggang Xue, Qifan Demir, Hilmi Volkan Liu, Chuan School of Electrical and Electronic Engineering Engineering::Materials Colloidal Quantum Well Light-Emitting Diode Colloidal quantum wells (CQWs) have emerged as a promising family of two-dimensional (2D) optoelectronic materials with outstanding properties, including ultranarrow luminescence emission, nearly unity quantum yield, and large extinction coefficient. However, the performance of CQWs-based light-emitting diodes (CQW-LEDs) is far from satisfactory, particularly for deep red emissions (≥660 nm). Herein, high efficiency, ultra-low-efficiency roll-off, high luminance, and extremely saturated deep red CQW-LEDs are reported. A key feature for the high performance is the understanding of charge dynamics achieved by introducing an efficient electron transport layer, ZnMgO, which enables balanced charge injection, reduced nonradiative channels, and smooth films. The CQW-LEDs based on (CdSe/CdS)@(CdS/CdZnS) ((core/crown)@(colloidal atomic layer deposition shell/hot injection shell)) show an external quantum efficiency of 9.89%, which is a record value for 2D nanocrystal LEDs with deep red emissions. The device also exhibits an ultra-low-efficiency roll-off and a high luminance of 3853 cd m-2. Additionally, an exceptional color purity with the CIE coordinates of (0.719, 0.278) is obtained, indicating that the color gamut covers 102% of the International Telecommunication Union Recommendation BT 2020 (Rec. 2020) standard in the CIE 1931 color space, which is the best for CQW-LEDs. Furthermore, an active-matrix CQW-LED pixel circuit is demonstrated. The findings imply that the understanding of charge dynamics not only enables high-performance CQW-LEDs and can be further applied to other kinds of nanocrystal LEDs but also is beneficial to the development of CQW-LEDs-based display technology and related integrated optoelectronics. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) This work was supported in part by National Natural Science Foundation of China under grant nos. 62104265 and 61922090, in part by the Science and Technology Program of Guangdong Province under grant no. 2021A0505110009, and in part by the Innovation and Technology Fund under Grant GHP/006/20GD. J. C. Huang thank the CityU fund (no. 9380088). Y.M. acknowledges the support from the National Natural Science Foundation of China (no. U20A20340), National Key Research and Development Program of China (no. 2020YFB0408100) and Guangdong Innovative and Entrepreneurial Research Team Program (no. 2016ZT06C412). Q.X. acknowledges support from Guang-dong Basic and Applied Basic Research Foundation for Distinguished Young Scholar (no. 2021B1515020028) and the Science and Technology Program of Guangzhou, China (no. 201904010147). H.V.D. gratefully acknowledges financial support in part from Agency for Science, Technology and Research (A*STAR) MTC program, grant no. M21J9b0085 (Singapore), Ministry of Education Tier 1 grant MOE-RG62/ 20 (Singapore) and TUBITAK 115F297, 117E713, 119N343, 121N395, and 20AG001, and support from TUBA. 2022-12-05T06:50:42Z 2022-12-05T06:50:42Z 2022 Journal Article Hu, S., Shabani, F., Liu, B., Zhang, L., Guo, M., Lu, G., Zhou, Z., Wang, J., Huang, J. C., Min, Y., Xue, Q., Demir, H. V. & Liu, C. (2022). High-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics. ACS Nano, 16(7), 10840-10851. https://dx.doi.org/10.1021/acsnano.2c02967 1936-0851 https://hdl.handle.net/10356/163389 10.1021/acsnano.2c02967 35816171 2-s2.0-85135204228 7 16 10840 10851 en M21J9b0085 MOE-RG62/20 ACS Nano © 2022 American Chemical Society. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
Colloidal Quantum Well
Light-Emitting Diode
spellingShingle Engineering::Materials
Colloidal Quantum Well
Light-Emitting Diode
Hu, Sujuan
Shabani, Farzan
Liu, Baiquan
Zhang, Lingjiao
Guo, Min
Lu, Guanhua
Zhou, Zhisheng
Wang, Jing
Huang, Jacob C.
Min, Yonggang
Xue, Qifan
Demir, Hilmi Volkan
Liu, Chuan
High-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics
description Colloidal quantum wells (CQWs) have emerged as a promising family of two-dimensional (2D) optoelectronic materials with outstanding properties, including ultranarrow luminescence emission, nearly unity quantum yield, and large extinction coefficient. However, the performance of CQWs-based light-emitting diodes (CQW-LEDs) is far from satisfactory, particularly for deep red emissions (≥660 nm). Herein, high efficiency, ultra-low-efficiency roll-off, high luminance, and extremely saturated deep red CQW-LEDs are reported. A key feature for the high performance is the understanding of charge dynamics achieved by introducing an efficient electron transport layer, ZnMgO, which enables balanced charge injection, reduced nonradiative channels, and smooth films. The CQW-LEDs based on (CdSe/CdS)@(CdS/CdZnS) ((core/crown)@(colloidal atomic layer deposition shell/hot injection shell)) show an external quantum efficiency of 9.89%, which is a record value for 2D nanocrystal LEDs with deep red emissions. The device also exhibits an ultra-low-efficiency roll-off and a high luminance of 3853 cd m-2. Additionally, an exceptional color purity with the CIE coordinates of (0.719, 0.278) is obtained, indicating that the color gamut covers 102% of the International Telecommunication Union Recommendation BT 2020 (Rec. 2020) standard in the CIE 1931 color space, which is the best for CQW-LEDs. Furthermore, an active-matrix CQW-LED pixel circuit is demonstrated. The findings imply that the understanding of charge dynamics not only enables high-performance CQW-LEDs and can be further applied to other kinds of nanocrystal LEDs but also is beneficial to the development of CQW-LEDs-based display technology and related integrated optoelectronics.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Hu, Sujuan
Shabani, Farzan
Liu, Baiquan
Zhang, Lingjiao
Guo, Min
Lu, Guanhua
Zhou, Zhisheng
Wang, Jing
Huang, Jacob C.
Min, Yonggang
Xue, Qifan
Demir, Hilmi Volkan
Liu, Chuan
format Article
author Hu, Sujuan
Shabani, Farzan
Liu, Baiquan
Zhang, Lingjiao
Guo, Min
Lu, Guanhua
Zhou, Zhisheng
Wang, Jing
Huang, Jacob C.
Min, Yonggang
Xue, Qifan
Demir, Hilmi Volkan
Liu, Chuan
author_sort Hu, Sujuan
title High-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics
title_short High-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics
title_full High-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics
title_fullStr High-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics
title_full_unstemmed High-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics
title_sort high-performance deep red colloidal quantum well light-emitting diodes enabled by the understanding of charge dynamics
publishDate 2022
url https://hdl.handle.net/10356/163389
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