Correction Due to Nonthermally Coupled Emission Bands and Its Implications on the Performance of Y2O3:Yb3+ /Er3+ Single-Particle Thermometers

Autor(es)

Pessoa, Allison R. ; Galindo, Jefferson A. O. ; dos Santos, Luiz F. ; Goncalves, Rogeria R. ; Maier, Stefan A. ; Menezes, Leonardo de S. ; Amaral, Anderson M.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. 127, n. 20, p. 8-pg., 2023-05-16.

Resumo

Lanthanide-doped single dielectric nanoparticles havebeen exploitedtoward the realization of temperature sensing in the nanoscale withhigh spatial, temporal, and thermal resolution. However, due to therelatively small number of emitters when compared with suspensionsor powders, the luminescence readouts in individual nanocrystals usuallyrequire higher excitation power densities to keep an acceptable signal-to-noiseratio. Since in numerous cases these thermometers work by exploitingupconversion excitation pathways, higher excitation powers can leadto higher-order photon emissions that can overlap with the luminescentbands used to perform the temperature measurements. This work showsthat the performance and the characterization of similar to 400 nm Y2O3: Yb3+/Er3+ single-particlethermometers vary depending on the excitation irradiance if higher-orderspectrally overlapping bands are not properly taken into account.We apply a recently developed method to separate these bands basedon their different power-law, without the need for multiple wavelengthexcitation, resulting in a correction procedure that reduces the temperaturereadout uncertainty from 0.6 to 0.3 K in the specific case of thethermometer investigated in this work. Additionally, power-excitation-relatedthermal artifacts on the order of 10 degrees C were detected and correctedwith the presented method. (AU)

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