Tuning the sensitivity of Ln(3+)-based luminescent molecular thermometers through ligand design
authors Brites, CDS; Lima, PP; Carlos, LD
nationality International
journal JOURNAL OF LUMINESCENCE
author keywords Micro and nanothermometry; Relative sensitivity; Trivalent lanthanide ions; Organic-inorganic hybrids
keywords FLUORESCENT POLYMERIC THERMOMETER; INTRACELLULAR TEMPERATURE; NANOSCALE; LIFETIME; EMISSION; ER3+; CONVERSION; COMPLEXES; SENSORS; PROBES
abstract Luminescence thermometry is being addressed as one of the most promising techniques to non-contact measurement of temperature with sub-micrometric resolution, due to the possibility of design the thermometer performance by the smart combination of emitting centers, ligands and host matrix. Numerous applications in microelectronic circuits and photonic devices will benefit of improved spatial and temporal resolution in the temperature imaging. In this paper we report three Ln(3+)-based (Ln=Eu, Tb) molecular thermometers co-doping an organic-inorganic hybrid matrix with Eu3+/Tb3+ chelates that differ in the ligand used. We show that the sensitivity of such thermometers can be tuned from 0.042 +/- 0.002 to 3.0 +/- 0.4% .K-1, in the 295-330 K range, through the wisest design of the ligand (and the ligand-hybrid host interactions). The maximum sensitivity value is one of the largest reported so far for luminescent ratiometric thermometers. Furthermore, we rationalize the increase on the performance of the molecular thermometers using a partial energy scheme involving the emitting levels of the Ln(3+) ions and the singlet and triplet states of the ligands and the hybrid host. (C) 2015 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0022-2313
year published 2016
volume 169
beginning page 497
ending page 502
digital object identifier (doi) 10.1016/j.jlumin.2015.01.025
web of science category Optics
subject category Optics
unique article identifier WOS:000365606200023
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