Cryogenic Luminescent Ratiometric Thermometers Based on Tetragonal Na[LnSiO(4)]center dot xNaOH (Ln = Gd, Tb, Eu; x approximate to 0.2)

resumo

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.

palavras-chave

ORGANIC FRAMEWORK; LANTHANIDE SILICATE; TEMPERATURE; PHOSPHORS; EMISSION; NANOPARTICLES; EMITTERS; SPECTRA

categoria

Chemistry

autores

Ananias, D; Mongis, CM; Carlos, LD; Rocha, J

nossos autores

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