Journal
ADVANCED SCIENCE
Volume 6, Issue 10, Pages -Publisher
WILEY
DOI: 10.1002/advs.201802282
Keywords
energy level; LiLuF4 nanocrystals; neodymium; site symmetry; temperature sensing
Categories
Funding
- Strategic Priority Research Program of the CAS [XDB20000000]
- NSFC [U1805252, 21771185, 21501180, 21875250, 11774345]
- CAS/SAFEA International Partnership Program for Creative Research Teams
- Youth Innovation Promotion Association [2016277]
- Chunmiao Project of Haixi Institutes of the CAS [CMZX-2016-002]
- Natural Science Foundation of Fujian Province [2017J05095, 2017I0018, 2018J01089]
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Nd3+-doped near-infrared (NIR) luminescent nanocrystals (NCs) have shown great promise in various bioapplications. A fundamental understanding of the electronic structures of Nd3+ in NCs is of vital importance for discovering novel Ne-activated luminescent nanoprobes and exploring their new applications. Herein, the electronic structures of Nd3+ in LiLuF4 NCs are unraveled by means of low-temperature and high-resolution optical spectroscopy. The photoactive site symmetry of Nd3+ in LiLuF4 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 Nd3+, the application of LiLuF4:Nd3+ 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 LiLuF4:Nd3+ NCs in temperature sensing and also lay a foundation for future design of efficient Nd3+-based luminescent nanoprobes.
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