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Accessing high-order multiphoton excited fluorescence (H-MPEF) materials is challenging yet and needs complicated synthesis procedures. In this study, we successfully assembled plasmonic Au nanorods (Au NRs) with multiphoton responsive metal-organic frameworks (MOFs), resulting in a significant several-fold enhancement of H-MPEF. The extent of multiphoton enhancement was found to be strongly dependent on the degree of overlap between the multiphoton excitation wavelength of MOFs and the localized surface plasmon resonance absorbance of Au NRs, indicating the importance of plasmon-induced resonance energy transfer. Besides, plasmon-induced hot electron transfer played a vital role in enhanced multiphoton activity as well. Notably, the optimum H-MPEF enhancement occurs at the second near-infrared (NIR-II) region, which provides a promising platform for fluorescent bioimaging. Our findings provide a feasible and practical method to fabricate optimized H-MPEF materials for biological imaging using tissue-penetrating NIR-II light.


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Plasmon coupling-driven enhanced high-order multiphoton excited fluorescent performance of metal-organic frameworks

Show Author's information Tong Meng1,§Bo Li1,§Linlin Zeng3,§Xianshun Sun2( )Yupeng Tian2Hongping Zhou2Meng Zhou3( )Dandan Li1( )
Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials, Ministry of Education, Anhui University, Hefei 230601, China
School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China
Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China

§ Tong Meng, Bo Li, and Linlin Zeng contributed equally to this work.

Abstract

Accessing high-order multiphoton excited fluorescence (H-MPEF) materials is challenging yet and needs complicated synthesis procedures. In this study, we successfully assembled plasmonic Au nanorods (Au NRs) with multiphoton responsive metal-organic frameworks (MOFs), resulting in a significant several-fold enhancement of H-MPEF. The extent of multiphoton enhancement was found to be strongly dependent on the degree of overlap between the multiphoton excitation wavelength of MOFs and the localized surface plasmon resonance absorbance of Au NRs, indicating the importance of plasmon-induced resonance energy transfer. Besides, plasmon-induced hot electron transfer played a vital role in enhanced multiphoton activity as well. Notably, the optimum H-MPEF enhancement occurs at the second near-infrared (NIR-II) region, which provides a promising platform for fluorescent bioimaging. Our findings provide a feasible and practical method to fabricate optimized H-MPEF materials for biological imaging using tissue-penetrating NIR-II light.

Keywords: fluorescence imaging, metal-organic framework (MOF), plasmon resonance, multiphoton activity

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Publication history

Received: 16 January 2024
Revised: 05 March 2024
Accepted: 17 March 2024
Published: 19 April 2024

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© Tsinghua University Press 2024

Acknowledgements

Acknowledgements

This work was supported by a grant for the National Natural Science Foundation of China (Nos. 22171001 and 22305001) and Natural Science Foundation of Anhui Province (No. 2108085MB49). All the animal procedures were approved by the Institutional Animal Care and Use Committee of Anhui University (serial number: 2021-015) based on the National Standard of China GB/T35892-2018 guidelines for Ethical Review of Experimental Animal Welfare.

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