Perovskite-molecule composite thin films for efficient and stable light-emitting diodes

Heyong Wang, Felix Utama Kosasih, Hongling Yu, Guanhaojie Zheng, Jiangbin Zhang, Galia Pozina, Yang Liu, Chunxiong Bao, Zhangjun Hu, Xianjie Liu, Libor Kobera, Sabina Abbrent, Jiri Brus, Yizheng Jin, Mats Fahlman, Richard H. Friend, Caterina Ducati, Xiao-Ke Liu () and Feng Gao ()
Additional contact information
Heyong Wang: Linköping University
Felix Utama Kosasih: University of Cambridge
Hongling Yu: Linköping University
Guanhaojie Zheng: Linköping University
Jiangbin Zhang: University of Cambridge
Galia Pozina: Linköping University
Yang Liu: Zhejiang University
Chunxiong Bao: Linköping University
Zhangjun Hu: Linköping University
Xianjie Liu: Linköping University
Libor Kobera: Institute of Macromolecular Chemistry of the Czech Academy of Sciences
Sabina Abbrent: Institute of Macromolecular Chemistry of the Czech Academy of Sciences
Jiri Brus: Institute of Macromolecular Chemistry of the Czech Academy of Sciences
Yizheng Jin: Zhejiang University
Mats Fahlman: Linköping University
Richard H. Friend: University of Cambridge
Caterina Ducati: University of Cambridge
Xiao-Ke Liu: Linköping University
Feng Gao: Linköping University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Although perovskite light-emitting diodes (PeLEDs) have recently experienced significant progress, there are only scattered reports of PeLEDs with both high efficiency and long operational stability, calling for additional strategies to address this challenge. Here, we develop perovskite-molecule composite thin films for efficient and stable PeLEDs. The perovskite-molecule composite thin films consist of in-situ formed high-quality perovskite nanocrystals embedded in the electron-transport molecular matrix, which controls nucleation process of perovskites, leading to PeLEDs with a peak external quantum efficiency of 17.3% and half-lifetime of approximately 100 h. In addition, we find that the device degradation mechanism at high driving voltages is different from that at low driving voltages. This work provides an effective strategy and deep understanding for achieving efficient and stable PeLEDs from both material and device perspectives.

Date: 2020
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DOI: 10.1038/s41467-020-14747-6

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