Suppressing phase disproportionation in quasi-2D perovskite light-emitting diodes

Kang Wang, Zih-Yu Lin, Zihan Zhang, Linrui Jin, Ke Ma, Aidan H. Coffey, Harindi R. Atapattu, Yao Gao, Jee Yung Park, Zitang Wei, Blake P. Finkenauer, Chenhui Zhu, Xiangeng Meng, Sarah N. Chowdhury, Zhaoyang Chen, Tanguy Terlier, Thi-Hoai Do, Yan Yao, Kenneth R. Graham, Alexandra Boltasseva, Tzung-Fang Guo, Libai Huang, Hanwei Gao, Brett M. Savoie and Letian Dou ()
Additional contact information
Kang Wang: Purdue University
Zih-Yu Lin: Purdue University
Zihan Zhang: Florida State University
Linrui Jin: Purdue University
Ke Ma: Purdue University
Aidan H. Coffey: Purdue University
Harindi R. Atapattu: University of Kentucky
Yao Gao: Purdue University
Jee Yung Park: Purdue University
Zitang Wei: Purdue University
Blake P. Finkenauer: Purdue University
Chenhui Zhu: Lawrence Berkeley National Laboratory
Xiangeng Meng: Qilu University of Technology (Shandong Academy of Sciences)
Sarah N. Chowdhury: Purdue University
Zhaoyang Chen: University of Houston
Tanguy Terlier: Rice University
Thi-Hoai Do: National Cheng Kung University
Yan Yao: University of Houston
Kenneth R. Graham: University of Kentucky
Alexandra Boltasseva: Purdue University
Tzung-Fang Guo: National Cheng Kung University
Libai Huang: Purdue University
Hanwei Gao: Florida State University
Brett M. Savoie: Purdue University
Letian Dou: Purdue University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Electroluminescence efficiencies and stabilities of quasi-two-dimensional halide perovskites are restricted by the formation of multiple-quantum-well structures with broad and uncontrollable phase distributions. Here, we report a ligand design strategy to substantially suppress diffusion-limited phase disproportionation, thereby enabling better phase control. We demonstrate that extending the π-conjugation length and increasing the cross-sectional area of the ligand enables perovskite thin films with dramatically suppressed ion transport, narrowed phase distributions, reduced defect densities, and enhanced radiative recombination efficiencies. Consequently, we achieved efficient and stable deep-red light-emitting diodes with a peak external quantum efficiency of 26.3% (average 22.9% among 70 devices and cross-checked) and a half-life of ~220 and 2.8 h under a constant current density of 0.1 and 12 mA/cm2, respectively. Our devices also exhibit wide wavelength tunability and improved spectral and phase stability compared with existing perovskite light-emitting diodes. These discoveries provide critical insights into the molecular design and crystallization kinetics of low-dimensional perovskite semiconductors for light-emitting devices.

Date: 2023
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DOI: 10.1038/s41467-023-36118-7

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