Volume 15, Issue 7 2100023
Research Article

Unraveling the Role of Crystallization Dynamics on Luminescence Characteristics of Perovskite Light-Emitting Diodes

Kong-Chao Shen

Kong-Chao Shen

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 China

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Jing-Kun Wang

Jing-Kun Wang

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 China

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Yang Shen

Yang Shen

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 China

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Yan-Qing Li

Corresponding Author

Yan-Qing Li

School of Physics and Electronic Science, Ministry of Education Nanophotonics & Advanced Instrument Engineering Research Center, East China Normal University, Shanghai, 200062 China

E-mail: [email protected]; [email protected]; [email protected]

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Ming-Lei Guo

Ming-Lei Guo

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 China

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Zhen-Huang Su

Zhen-Huang Su

Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Chinese Academy of Sciences, Shanghai, 201204 China

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Lin-Yang Lu

Lin-Yang Lu

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 China

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Xiao-Yi Cai

Xiao-Yi Cai

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 China

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Li Chen

Li Chen

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 China

Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Chinese Academy of Sciences, Shanghai, 201204 China

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Fei Song

Fei Song

Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Chinese Academy of Sciences, Shanghai, 201204 China

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Xing-Yu Gao

Xing-Yu Gao

Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Chinese Academy of Sciences, Shanghai, 201204 China

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Jian-Xin Tang

Corresponding Author

Jian-Xin Tang

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 China

Macao Institute of Materials Science and Engineering (MIMSE), Macau University of Science and Technology, Taipa, Macau SAR, 999078 China

E-mail: [email protected]; [email protected]; [email protected]

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Nobuo Ueno

Corresponding Author

Nobuo Ueno

Graduate School of Advanced Integration Science, Chiba University, Chiba, 263-8522 Japan

E-mail: [email protected]; [email protected]; [email protected]

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First published: 07 June 2021
Citations: 35

Abstract

Metal halide perovskites are one of the most promising materials for optoelectronic applications owing to their unique optoelectronic properties. In the pursuit of achieving the efficient perovskite light-emitting diodes (PeLEDs), the critical role of crystallization dynamics on luminescence properties of cesium lead bromide (CsPbBr3) perovskite films has been clarified based on the characterizations of in situ photoelectron spectroscopy, synchrotron-based grazing incidence X-ray diffraction, and device fabrication. The crystallinity and crystal orientation of CsPbBr3 perovskite films has been effectively controlled when tuning the underlayer of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) with the ethanolamine modification. The fast crystallization with the formation of pure cubic phase (α-CsPbBr3) reveals a substantial boost in luminance and device efficiency of PeLEDs, whereas the performance degradation occurs due to the phase transition from α-CsPbBr3 to orthogonal phase (γ-CsPbBr3) along with the appearance of PbBr2. The decomposition of organic additives in the perovskite films is a key factor that results in this phase transition, which changes the absorption and band gap as confirmed by the density functional theory calculation. These experimental and theoretical findings provide a better understanding of the crystallization dynamics of perovskite emitters and their influence on device performance by tuning the substrate properties.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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