Cited by 277Luminescence and Fluorescent MaterialsQuantum Dots Synthesis And PropertiesLuminescence Properties of Advanced Materials

Planar and Twisted Molecular Structure Leads to the High Brightness of Semiconducting Polymer Nanoparticles for NIR-IIa Fluorescence Imaging

Liu, Shunjie, Ou, Hanlin, Li, Yuanyuan, Zhang, Haoke, Liu, Junkai, Lu, Xuefeng, Kwok, Ryan T.K., Lam, Jacky W.Y. +2 more·2020·Journal of the American Chemical Society

Abstract

Semiconducting polymer nanoparticles (SPNs) emitting in the second near-infrared window (NIR-II, 1000–1700 nm) are promising materials for deep-tissue optical imaging in mammals, but the brightness is far from satisfactory. Herein, we developed a molecular design strategy to boost the brightness of NIR-II SPNs: structure planarization and twisting. By integration of the strong absorption coefficient inherited from planar π-conjugated units and high solid-state quantum yield (Φ PL ) from twisted motifs into one polymer, a rise in brightness was obtained. The resulting pNIR-4 with both twisted and planar structure displayed improved Φ PL and absorption when compared to the planar polymer pNIR-1 and the twisted polymer pNIR-2. Given the emission tail extending into the NIR-IIa region (1300–1400 nm) of the pNIR-4 nanoparticles, NIR-IIa fluorescence imaging of blood vessels with enhanced clarity was observed. Moreover, a pH-responsive poly(β-amino ester) made pNIR-4 specifically accumulate at tumor sites, allowing NIR-IIa fluorescence image-guided cancer precision resection. This study provides a molecular design strategy for developing highly bright fluorophores.

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Crossref · 10.1021/jacs.0c07193

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Authors
Liu, S., Ou, H., Li, Y., Zhang, H., Liu, J., Lu, X., Kwok, R. T. K., Lam, J. W. Y., Ding, D., & Tang, B. Z.
Affiliations
  • Hong Kong University of Science and Technology (HK)
  • Nankai University (CN)
Corresponding author
  • Ding, Dan
  • Tang, Ben Zhong
Venue
Journal of the American Chemical Society
Published
2020-08-05
Volume
142
Issue
35
Pages
15146-15156
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W3047609777
Cited by
277
References
68
Citations by year
2026: 26 · 2025: 39 · 2024: 51 · 2023: 55 · 2022: 56 · 2021: 42 · 2020: 8
FWCI
15.65
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of the American Chemical Society (publishedVersion)
  • PubMed (publishedVersion)
  • Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
Funders
  • Research Grants Council, University Grants Committee (AHKUST605/16, C6009-17G)
  • Nankai University
  • Ministry of Science and Technology of the People's Republic of China (2017YFE0132200)
  • Shenzhen Science and Technology Innovation Commission (JCYJ20180507183832744)
  • Innovation and Technology Commission (ITCCNERC14SC01, ITCPD/17-9)
  • National Natural Science Foundation of China (21788102, 21805002, 51873092, 51961160730)
  • Ming Wai Lau Centre for Reparative Medicine, Karolinska Institutet
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
  • Physical Sciences › Materials Science › Materials Chemistry › Quantum Dots Synthesis And Properties
  • Physical Sciences › Materials Science › Materials Chemistry › Luminescence Properties of Advanced Materials
Keywords
semiconducting polymer nanoparticles, second near-infrared window, fluorescence intensity, molecular design, twisted molecular structure, poly(β-amino ester), pH-responsive nanoparticles, tumor targeting, vascular imaging

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