Dimension control of in situ fabricated CsPbClBr2 nanocrystal films toward efficient blue light-emitting diodes

Chenhui Wang, Dengbao Han, Junhui Wang, Yingguo Yang, Xinyue Liu, Sheng Huang, Xin Zhang, Shuai Chang (), Kaifeng Wu and Haizheng Zhong ()
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Chenhui Wang: Beijing Institute of Technology
Dengbao Han: Beijing Institute of Technology
Junhui Wang: Chinese Academy of Sciences
Yingguo Yang: Chinese Academy of Sciences
Xinyue Liu: Beijing Institute of Technology
Sheng Huang: Beijing Institute of Technology
Xin Zhang: Beijing Institute of Technology
Shuai Chang: Beijing Institute of Technology
Kaifeng Wu: Chinese Academy of Sciences
Haizheng Zhong: Beijing Institute of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract In the field of perovskite light-emitting diodes (PeLEDs), the performance of blue emissive electroluminescence devices lags behind the other counterparts due to the lack of fabrication methodology. Herein, we demonstrate the in situ fabrication of CsPbClBr2 nanocrystal films by using mixed ligands of 2-phenylethanamine bromide (PEABr) and 3,3-diphenylpropylamine bromide (DPPABr). PEABr dominates the formation of quasi-two-dimensional perovskites with small-n domains, while DPPABr induces the formation of large-n domains. Strong blue emission at 470 nm with a photoluminescence quantum yield up to 60% was obtained by mixing the two ligands due to the formation of a narrower quantum-well width distribution. Based on such films, efficient blue PeLEDs with a maximum external quantum efficiency of 8.8% were achieved at 473 nm. Furthermore, we illustrate that the use of dual-ligand with respective tendency of forming small-n and large-n domains is a versatile strategy to achieve narrow quantum-well width distribution for photoluminescence enhancement.

Date: 2020
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DOI: 10.1038/s41467-020-20163-7

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