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

被引:60
|
作者
Hazra, Chanchal [1 ]
Skripka, Artiom [1 ]
Ribeiro, Sidney J. L. [2 ]
Vetrone, Fiorenzo [1 ]
机构
[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
基金
巴西圣保罗研究基金会; 加拿大创新基金会; 加拿大自然科学与工程研究理事会;
关键词
biological windows; LiErF4; nanothermometry; near-infrared emission; rare-earth nanoparticles; upconversion; ENERGY-TRANSFER; CRYSTAL-FIELD; TEMPERATURE; NANOPARTICLES; NANOCRYSTALS; MULTIPHONON; THERMOMETRY; RELAXATION; ND3+; IONS;
D O I
10.1002/adom.202001178
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
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页数:9
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