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Nd3+-doped lanthanum oxychloride nanocrystals as nanothermometers

Abstract: 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 Nd3+-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 Nd3+ 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/Nd3+ cores was found to further enhance the photoluminescence intensity and also the lifetime of the 1066 nm, 4F3/2 to 4I11/2 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.

 Authorship: Renero-Lecuna C., Herrero A., Jimenez De Aberasturi D., Martínez-Flórez M., Valiente R., Mychinko M., Bals S., Liz-Marzán L.M.,

 Fuente: Journal of Physical Chemistry C, 2021, 125(36), 19887-19896

 Publisher: American Chemical Society

 Year of publication: 2021

 No. of pages: 10

 Publication type: Article

 DOI: 10.1021/acs.jpcc.1c05828

 ISSN: 1932-7447,1932-7455

 Publication Url: https://doi.org/10.1021/acs.jpcc.1c05828

Authorship

RENERO LECUNA, CARLOS

HERRERO, ADA

JIMENEZ DE ABERASTURI, DORLETA

MARTÍNEZ-FLÓREZ, MIRIAM

MYCHINKO, MIKHAIL

BALS, SARA

LIZ-MARZÁN, LUIS M.