Erbium Single-Band Nanothermometry in the Third Bi... - BV FAPESP
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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Erbium Single-Band Nanothermometry in the Third Biological Imaging Window: Potential and Limitations

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Author(s):
Hazra, Chanchal [1] ; Skripka, Artiom [1] ; Ribeiro, Sidney J. L. [2] ; Vetrone, Fiorenzo [1]
Total Authors: 4
Affiliation:
[1] Univ Quebec, Ctr Energie Mat & Telecommun, Inst Natl Rech Sci, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2 - Canada
[2] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ADVANCED OPTICAL MATERIALS; v. 8, n. 23 DEC 2020.
Web of Science Citations: 0
Abstract

Near-infrared (NIR) nanothermometers are sought after in biomedicine when it comes to measuring temperatures subcutaneously. Yet, temperature sensing within the third biological imaging window (BW-III), where the highest contrast images can be obtained, remains relatively unexplored. Here, LiErF4/LiYF(4)rare-earth nanoparticles (RENPs) are studied as NIR nanothermometers in the BW-III. Under 793 nm excitation, LiErF4/LiYF(4 )RENPs emit around 1540 nm, corresponding to the I-4(13/2) ->(4)I(15/2 )radiative transition of Er3+. The fine Stark structure of this transition allows to delineate intensity regions within the emission band that can be used for single-band ratiometric nanothermometry. These nanothermometers have a relative temperature sensitivity of approximate to 0.40% degrees C-1. The temperature-dependent energy transfer to the surrounding solvent molecules plays a significant role in the thermometric properties of the RENPs. In addition, Ce(3+ )ions are doped in the core of the RENPs to examine whether it affects the NIR emission and temperature sensitivity. Ce3+ at 1 mol% marginally influences the downshifting emission intensity of the RENPs, yet increases the relative thermal sensitivity to approximate to 0.45% degrees C-1. Furthermore, Ce3+ quenches the visible upconversion emission of the RENPs. Together, LiErF4:Ce3+/LiYF(4 )RENPs enable single-band photoluminescence nanothermometry in the BW-III, with the future possibility of its integration within multifunctional decoupled theranostic nanostructures. (AU)

FAPESP's process: 17/23422-9 - Multicolour emissions through Bi-directional energy transfer in Nd3+-sensitized core/shell/shell upconverting nanoparticles for bio imaging applications
Grantee:Chanchal Hazra
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor