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Nano Research 2023, 16(7): 10476-10482 https://doi.org/10.1007/s12274-023-5708-9
Research Article | Issue | Published: 06 May 2023

Boosting self-trapped exciton emission from Cs3Cu2I5 nanocrystals by doping-enhanced exciton-phonon coupling

Show Author's Information Xiaohan Li1,2,  Aijun Liu1,2,  Zhaoyu Wang2,4( ),  Youchao Wei2,3,  Qun Lin2,  Yameng Chen2,  Yongsheng Liu1,2,3( ),  Maochun Hong1,2,3,4( )
College of Chemistry, Fuzhou University, Fuzhou 350116, China
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Keywords:
nanocrystals, Cs3Cu2I5, self-trapped exciton, exciton-phonon coupling, X-ray image
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Nanocrystals
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Li X, Liu A, Wang Z, et al. Boosting self-trapped exciton emission from Cs3Cu2I5 nanocrystals by doping-enhanced exciton-phonon coupling. Nano Research, 2023, 16(7): 10476-10482. https://doi.org/10.1007/s12274-023-5708-9
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Abstract Full text Electronic supplementary material About this article

Self-trapped excitons (STEs) emission from halide perovskites with strong exciton-phonon coupling has attracted considerable attention due to the widespread application in optoelectronic devices. Nevertheless, the in-depth understanding of the relationship between exciton-phonon coupling and luminescence intensity remains incomplete. Herein, a doping-enhanced exciton-phonon coupling effect is observed in Cs3Cu2I5 nanocrystals (NCs), which leads to a remarkable increasement of their STEs emission efficiency. Mechanism study shows that the hetero-valent substitution of Cu+ with alkaline-earth metal ions (AE2+) causes a greater degree of Jahn–Teller distortion between the ground state and excited state structures of [Cu2I5]3− clusters as evidenced by our spectral analysis and first-principles calculations. As a consequence, an X-ray detector based on these Cs3Cu2I5:AE NCs delivers an X-ray imaging resolution of up to 10 lp·mm−1 and a low detection limit of 0.37 μGyair·s−1, disclosing the potential of doping-enhanced exciton-phonon coupling effect in improving STEs-emission and practical application for X-ray imaging.


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Electronic supplementary material
About this article

Boosting self-trapped exciton emission from Cs3Cu2I5 nanocrystals by doping-enhanced exciton-phonon coupling

Show Author's information Xiaohan Li1,2, Aijun Liu1,2, Zhaoyu Wang2,4( ), Youchao Wei2,3, Qun Lin2, Yameng Chen2, Yongsheng Liu1,2,3( ), Maochun Hong1,2,3,4( )
College of Chemistry, Fuzhou University, Fuzhou 350116, China
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

Abstract

Self-trapped excitons (STEs) emission from halide perovskites with strong exciton-phonon coupling has attracted considerable attention due to the widespread application in optoelectronic devices. Nevertheless, the in-depth understanding of the relationship between exciton-phonon coupling and luminescence intensity remains incomplete. Herein, a doping-enhanced exciton-phonon coupling effect is observed in Cs3Cu2I5 nanocrystals (NCs), which leads to a remarkable increasement of their STEs emission efficiency. Mechanism study shows that the hetero-valent substitution of Cu+ with alkaline-earth metal ions (AE2+) causes a greater degree of Jahn–Teller distortion between the ground state and excited state structures of [Cu2I5]3− clusters as evidenced by our spectral analysis and first-principles calculations. As a consequence, an X-ray detector based on these Cs3Cu2I5:AE NCs delivers an X-ray imaging resolution of up to 10 lp·mm−1 and a low detection limit of 0.37 μGyair·s−1, disclosing the potential of doping-enhanced exciton-phonon coupling effect in improving STEs-emission and practical application for X-ray imaging.

Keywords: nanocrystals, Cs3Cu2I5, self-trapped exciton, exciton-phonon coupling, X-ray image

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Publication history
Copyright
Acknowledgements

Publication history

Received: 18 February 2023
Revised: 23 March 2023
Accepted: 02 April 2023
Published: 06 May 2023
Issue date: July 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work is supported by the Fund of Fujian Science & Technology Innovation Laboratory for Optoelectronic Information (Nos. 2020ZZ114 and 2022ZZ204), the Key Research Program of Frontier Science CAS (No. QYZDY-SSW-SLH025), the National Natural Science Foundation of China (Nos. 21731006 and 21871256), and the Fund of Advanced Energy Science and Technology Guangdong Laboratory (No. DJLTN0200/DJLTN0240).

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