Unraveling the Electronic Structures of Neodymium in LiLuF 4 Nanocrystals for Ratiometric Temperature Sensing

Nd -doped near-infrared (NIR) luminescent nanocrystals (NCs) have shown great promise in various bioapplications. A fundamental understanding of the electronic structures of Nd in NCs is of vital importance for discovering novel Nd -activated luminescent nanoprobes and exploring their new applicatio...

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Veröffentlicht in:Advanced science 2019-05, Vol.6 (10), p.1802282
Hauptverfasser: Huang, Ping, Zheng, Wei, Tu, Datao, Shang, Xiaoying, Zhang, Meiran, Li, Renfu, Xu, Jin, Liu, Yan, Chen, Xueyuan
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Sprache:eng
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Zusammenfassung:Nd -doped near-infrared (NIR) luminescent nanocrystals (NCs) have shown great promise in various bioapplications. A fundamental understanding of the electronic structures of Nd in NCs is of vital importance for discovering novel Nd -activated luminescent nanoprobes and exploring their new applications. Herein, the electronic structures of Nd in LiLuF NCs are unraveled by means of low-temperature and high-resolution optical spectroscopy. The photoactive site symmetry of Nd in LiLuF NCs and its crystal-field (CF) transition lines in the NIR region of interest are identified. By taking advantage of the well-resolved and sharp CF transition lines of Nd , the application of LiLuF :Nd NCs as sensitive NIR-to-NIR luminescent nanoprobes for ratiometric detection of cryogenic temperature with a linear range of 77-275 K is demonstrated. These findings reveal the great potential of LiLuF :Nd NCs in temperature sensing and also lay a foundation for future design of efficient Nd -based luminescent nanoprobes.
ISSN:2198-3844
2198-3844
DOI:10.1002/advs.201802282