4.7 Article

Luminescent Yb3+,Er3+-Doped α-La(IO3)3 Nanocrystals for Neuronal Network Bio-Imaging and Nanothermometry

Journal

NANOMATERIALS
Volume 11, Issue 2, Pages -

Publisher

MDPI
DOI: 10.3390/nano11020479

Keywords

luminescence; harmonic iodate nanocrystals; neurons; biophotonics; nanothermometry

Funding

  1. French-Swiss Interreg V (Project OncoNanoscreen)
  2. French Research Agency (ANR Nanomesh) [ANR-18-CE42-0003]
  3. Agence Nationale de la Recherche (ANR) [ANR-18-CE42-0003] Funding Source: Agence Nationale de la Recherche (ANR)

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The dual-light emitting Yb3+,Er3+-codoped alpha-La(IO3)(3) nanocrystals can be used as optical nanoprobes and thermal sensors, with the ability to emit visible photoluminescence signals in cortical and hippocampal neurons, and has a relative thermal sensitivity of 1.2% K-1.
Dual-light emitting Yb3+,Er3+-codoped alpha-La(IO3)(3) nanocrystals, known to exhibit both second harmonic signal and photoluminescence (PL), are evaluated as optical nanoprobes and thermal sensors using both conventional microscopes and a more sophisticated micro-PL setup. When loaded in cortical and hippocampal neurons for a few hours at a concentration of 0.01 mg/mL, a visible PL signal arising from the nanocrystals can be clearly detected using an epifluorescent conventional microscope, enabling to localize the nanocrystals along the stained neurons and to record PL variation with temperature of 0.5% K-1. No signal of cytotoxicity, associated with the presence of nanocrystals, is observed during the few hours of the experiment. Alternatively, a micro-PL setup can be used to discriminate the different PL lines. From ratiometric PL measurements, a relative thermal sensitivity of 1.2% K-1 was measured.

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