Stable Perovskite Quantum Dots Light-Emitting Diodes with Efficiency Exceeding 24

Xuanyu Zhang; Qiangqiang Wang; Zhiwei Yao; Ming Deng; Jing Wang; Lei Qian; Yong Ren; Yuying Yan; Chaoyu Xiang

doi:10.1002/advs.202304696

Stable Perovskite Quantum Dots Light-Emitting Diodes with Efficiency Exceeding 24

Adv Sci (Weinh). 2023 Dec;10(36):e2304696. doi: 10.1002/advs.202304696. Epub 2023 Oct 27.

Authors

Xuanyu Zhang^{1

2

3

4

5}, Qiangqiang Wang^{1

3

4

6}, Zhiwei Yao^{1

3

4}, Ming Deng^{1

3

4}, Jing Wang^{7

8}, Lei Qian^{1

3

4

5}, Yong Ren^{2

7}, Yuying Yan⁹, Chaoyu Xiang^{1

3

4

5}

Affiliations

¹ Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo, Zhejiang, 315201, China.
² Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, Ningbo, 315040, China.
³ Division of Functional Materials and Nanodevices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
⁴ Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Qianwan Institute of CNITECH, Ningbo, 315300, China.
⁵ Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Science, Ningbo, Zhejiang, 315201, China.
⁶ School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, Zhejiang, 315211, China.
⁷ Key Laboratory of Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province, University of Nottingham Ningbo China, Ningbo, 315100, China.
⁸ Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China, Ningbo, 315100, China.
⁹ Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK.

Abstract

Perovskite nanocrystals for light-emitting diodes are often synthesized by uncontrollable metathesis reactions, suffering from low product yield, nonuniform growth, and poor stability. Herein, by controlling the nucleation kinetics with high dissociation constant (Ka or Kb) acids or bases, homogenous one-route nucleation of perovskite nanocrystals is achieved as the cluster intermediates are eliminated. The stable, shape uniform, and narrow size distribution green nanocrystals are synthesized. The perovskite nanocrystal film exhibites excellent stability in 80% humidity air with only a 10% photoluminescence intensity drop after 16 h. Efficient and stable electroluminescence is demonstrated with an FWHM of 16 nm at 517 nm. The green devices shows a peak EQE of 24.13% with a lifetime T₅₀ of 54 min at 10 000 cd m^-2 .

Keywords: LEDs; narrow emission; perovskite nanocrystals; stability; synthesis.

Abstract

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