Abstract
Hexagonal-phase NaYF4 (β-NaYF4) has been acknowledged to be one of the most efficient doping hosts to prepare bright lanthanide-doped luminescent nano-bioprobes for various biomedical applications. However, to date, it remains a great challenge to synthesize ultra-bright lanthanide-doped β-NaYF4 nano-bioprobes under a low reaction temperature by using conventional synthetic methods. Herein, we first develop an acetic acid (HAc)-mediated coprecipitation method for the preparation of ultra-bright lanthanide-doped β-NaYF4 nanoprobes under a low reaction temperature at 200 °C. Based on a series of comparative spectroscopic investigations, we show that the use of HAc in the reaction environment can not only promote the rapid α–β phase transformation of NaYF4 host at 200 °C within 1 h but also boost the absolute photoluminescence quantum yield (PLQY) of NaYF4 nanocrystals to 30.68% for near-infrared emission and to 3.79% for upconversion luminescence, both of which are amongst the highest values for diverse lanthanide-doped luminescent nanocrystals ever reported. By virtue of their superior near-infrared luminescence, we achieve optical-guided dynamic vasculature imaging in vivo of the whole body at a high spatial resolution (23.8 µm) under 980 nm excitation, indicating its potential for the diagnosis and treatment evaluation of vasculature-related diseases.
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Acknowledgements
This work was supported by the Fund of Fujian Science & Technology Innovation Laboratory for Optoelectronic Information (No. 2020ZZ114), the Key Research Program of Frontier Science CAS (No. QYZDY-SSW-SLH025), the National Natural Science Foundation of China (Nos. 21871256 and 12204481), the Natural Science Foundation of Fujian Province (No. 2022J01211422), and Fund of Advanced Energy Science and Technology Guangdong Laboratory (No. DJLTN0200/DJLTN0240).
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Acetic acid-mediated rapid cubic-to-hexagonal (α–β) phase transformation for ultra-bright lanthanide-doped β-NaYF4 nano-bioprobes
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Jiang, S., Ke, J., Li, G. et al. Acetic acid-mediated rapid cubic-to-hexagonal (α–β) phase transformation for ultra-bright lanthanide-doped β-NaYF4 nano-bioprobes. Nano Res. 16, 10026–10033 (2023). https://doi.org/10.1007/s12274-023-5671-5
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DOI: https://doi.org/10.1007/s12274-023-5671-5