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The development of optical nanothermometers operating in the near-infrared (NIR) is of high relevance toward temperature measurements in biological systems. We propose herein the use of Nd-doped lanthanum oxychloride nanocrystals as an efficient system with intense photoluminescence under NIR irradiation in the first biological transparency window and emission in the second biological window with excellent emission stability over time under 808 nm excitation, regardless of Nd concentration, which can be considered as a particular strength of our system. Additionally, surface passivation through overgrowth of an inert LaOCl shell around optically active LaOCl/Nd cores was found to further enhance the photoluminescence intensity and also the lifetime of the 1066 nm, F to I transition, without affecting its (ratiometric) sensitivity toward temperature changes. As required for biological applications, we show that the obtained (initially hydrophobic) nanocrystals can be readily transferred into aqueous solvents with high, long-term stability, through either ligand exchange or encapsulation with an amphiphilic polymer.
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Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8450905 | PMC |
http://dx.doi.org/10.1021/acs.jpcc.1c05828 | DOI Listing |
Materials (Basel)
November 2020
Institute of Technology, Pedagogical University, Podchorążych 2, 30-084 Kraków, Poland.
In this study, pure YO, LaYO and LaNdYO nanosized powders were successfully synthesized by a modified sol-gel method. Pure and rare-earth ions doped yttria powders were characterized by X-ray diffraction, scanning electron microscopy and Brunauer-Emmett-Teller methods. The powders were sintered by the hot isostatic pressing process.
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