Exciton control enables high-performance colloidal quantum well light-emitting diodes-Reference-Cited by-同舟云学术

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

Published:2024-06-01 Issue:2 Volume:11 Page:
ISSN:1931-9401
Container-title:Applied Physics Reviews
language:en
Short-container-title:

Author:

Hu Sujuan¹^ORCID,Xiang Wenbin²,Liu Baiquan¹^ORCID,Zhang Lingjiao¹,Zhang Genghui¹,Guo Min¹,Yang Jinhu¹,Ren Yunfei¹,Yu Junhong³^ORCID,Yang Zhenyu⁴^ORCID,Gao Huayu¹,Wang Jing⁵,Xue Qifan⁶,Yeung Fion Sze Yan⁵^ORCID,Zhang Jiayu²^ORCID,Kwok Hoi Sing⁵^ORCID,Liu Chuan¹

Affiliation:

1. State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University 1 , Guangzhou 510275, China

2. Advanced Photonics Center, Southeast University 2 , Nanjing 210096, Jiangsu, China

3. LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Materials Sciences, School of Materials Science and Nanotechnology, Nanyang Technological University 3 , Singapore 639798, Singapore

4. MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-sen University 4 , Guangzhou 510275, China

5. State Key Laboratory on Advanced Displays and Optoelectronics Technologies, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology 5 , Hong Kong, China

6. State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology 6 , 381 Wushan Road, Guangzhou 510640, China

Abstract

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.

Funder

National Natural Science Foundation of China

the Science and Technology Planning Project of Guangdong Province

the Program for Guangdong High-Level Talents

Guangdong Innovation and Entrepreneurship Team Project

Science and Technology Program of Guangdong Province

the Innovation and Technology Fund

Publisher

AIP Publishing

Link

https://pubs.aip.org/aip/apr/article-pdf/doi/10.1063/5.0206176/20006726/021428_1_5.0206176.pdf

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