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 |
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Hauptverfasser: | , , , , , , , , |
Format: | Artikel |
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. |
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ISSN: | 2198-3844 2198-3844 |
DOI: | 10.1002/advs.201802282 |