Bright Tm3+-based downshifting luminescence nanoprobe operating around 1800 nm for NIR-IIb and c bioimaging

Yulei Chang (), Haoren Chen, Xiaoyu Xie, Yong Wan, Qiqing Li, Fengxia Wu, Run Yang, Wang Wang and Xianggui Kong
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Yulei Chang: Chinese Academy of Sciences
Haoren Chen: Chinese Academy of Sciences
Xiaoyu Xie: Chinese Academy of Sciences
Yong Wan: Chinese Academy of Sciences
Qiqing Li: Chinese Academy of Sciences
Fengxia Wu: Chinese Academy of Sciences
Run Yang: Chinese Academy of Sciences
Wang Wang: Chinese Academy of Sciences
Xianggui Kong: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Fluorescence bioimaging based on rare-earth-doped nanocrystals (RENCs) in the shortwave infrared (SWIR, 1000–3000 nm) region has aroused intense interest due to deeper penetration depth and clarity. However, their downshifting emission rarely shows sufficient brightness beyond 1600 nm, especially in NIR-IIc. Here, we present a class of thulium (Tm) self-sensitized RENC fluorescence probes that exhibit bright downshifting luminescence at 1600–2100 nm (NIR-IIb/c) for in vivo bioimaging. An inert shell coating minimizes surface quenching and combines strong cross-relaxation, allowing LiTmF4@LiYF4 NPs to emit these intense downshifting emissions by absorbing NIR photons at 800 nm (large Stokes shift ~1000 nm with a absolute quantum yield of ~14.16%) or 1208 nm (NIR-IIin and NIR-IIout). Furthermore, doping with Er3+ for energy trapping achieves four-wavelength NIR irradiation and bright NIR-IIb/c emission. Our results show that Tm-based NPs, as NIR-IIb/c nanoprobes with high signal-to-background ratio and clarity, open new opportunities for future applications and translation into diverse fields.

Date: 2023
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DOI: 10.1038/s41467-023-36813-5

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