Self-Calibrated Double Luminescent Thermometers Through Upconverting Nanoparticles
authors Brites, CDS; Martinez, ED; Urbano, RR; Rettori, C; Carlos, LD
nationality International
journal FRONTIERS IN CHEMISTRY
author keywords luminescence; double thermometers; upconverting nanoparticles; primary thermometry; self-referenced thermometry; polymer nanocomposites
keywords UP-CONVERSION LUMINESCENCE; TEMPERATURE-DEPENDENCE; NANOTHERMOMETER; SENSITIVITY; EMISSION
abstract Luminescent nanothermometry uses the light emission from nanostructures for temperature measuring. Non-contact temperature readout opens new possibilities of tracking thermal flows at the sub-micrometer spatial scale, that are altering our understanding of heat-transfer phenomena occurring at living cells, micro electromagnetic machines or integrated electronic circuits, bringing also challenges of calibrating the luminescent nanoparticles for covering diverse temperature ranges. In this work, we report self-calibrated double luminescent thermometers, embedding in a poly(methyl methacrylate) film Er3+-and Tm3+-doped upconverting nanoparticles. The Er3+-based primary thermometer uses the ratio between the integrated intensities of the H-2(11/2) -> I-4(15/2) and S-4(3/2) -> I-4(15/2) transitions (that follows the Boltzmann equation) to determine the temperature. It is used to calibrate the Tm3+/Er3+ secondary thermometer, which is based on the ratio between the integrated intensities of the (1)G(4) -> H-3(6) (Tm3+) and the S-4(3/2) -> I-4(15/2) (Er3+) transitions, displaying a maximum relative sensitivity of 2.96% K-1 and a minimum temperature uncertainty of 0.07 K. As the Tm3+/Er3+ ratio is calibrated trough the primary thermometer it avoids recurrent calibration procedures whenever the system operates in new experimental conditions.
publisher FRONTIERS MEDIA SA
issn 2296-2646
year published 2019
volume 7
digital object identifier (doi) 10.3389/fchem.2019.00267
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000464931700005
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journal impact factor 4.155
5 year journal impact factor 4.749
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