Cryogenic Luminescent Ratiometric Thermometers Based on Tetragonal Na[LnSiO(4)]center dot xNaOH (Ln = Gd, Tb, Eu; x approximate to 0.2)
authors Ananias, D; Mongis, CM; Carlos, LD; Rocha, J
nationality International
journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords Luminescent Thermometers; Lanthanides; Silicates; Temperature Sensing; Cryogenic
keywords ORGANIC FRAMEWORK; LANTHANIDE SILICATE; TEMPERATURE; PHOSPHORS; EMISSION; NANOPARTICLES; EMITTERS; SPECTRA
abstract The hydrothermal synthesis under mild conditions and structural characterization of Na[LnSiO(4)]center dot xNaOH (Ln = Gd, Tb, Eu; x approximate to 0.2) are reported. These materials crystallize in the tetragonal non-centrosymmetric I4(-) space group. The crystal phase purity is ascertained by powder X-ray diffraction and scanning electron microscopy, and further confirmed by photoluminescence spectroscopy and lifetime measurements at 294 and 12 K. Na[(Gd0.82Tb0.14Eu0.04)SiO4]center dot xNaOH and Na[(Gd0.66Tb0.30Eu0.04)SiO4]center dot xNaOH perform well as visible ratiometric thermometers, based on the ratio between the Tb3+ and Eu3+ emissions, presenting good relative thermal sensitivities at cryogenic temperature (<100 K) with maxima of 1.9 %K-1 at 14 K and 6.2 %K-1 at 12 K, respectively.
publisher WILEY-V C H VERLAG GMBH
issn 1434-1948
isbn 1099-0682
year published 2020
volume 2020
issue 19
beginning page 1852
ending page 1859
digital object identifier (doi) 10.1002/ejic.202000057
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000534207200005
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