Cryogenic Luminescent Ratiometric Thermometers Based on Tetragonal Na[LnSiO4]·xNaOH (Ln = Gd, Tb, Eu; x ≈ 0.2). Issue 19 (6th April 2020)

• Record Type: Journal Article
• Authors: Ananias, Duarte; Mongis, Camille M.; Carlos, Luís D.; Rocha, João
• Is Part Of: European journal of inorganic chemistry. Issue 19(2020)
• Page Start: 1852
• Page End: 1859
• Publication Date: 2020-04-06
• Subjects: Luminescent Thermometers -- Lanthanides -- Silicates -- Temperature Sensing -- Cryogenic; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.202000057
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : The hydrothermal synthesis under mild conditions and structural characterization of Na[LnSiO4 ]· xNaOH (Ln = Gd, Tb, Eu; x ≈ 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[(Gd0.82 Tb0.14 Eu0.04 )SiO4 ]· xNaOH and Na[(Gd0.66 Tb0.30 Eu0.04 )SiO4 ]· xNaOH perform well as visible ratiometric thermometers, based on the ratio between the Tb 3+ and Eu 3+ 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. Abstract : No cold feet: The tetragonal family of materials Na[LnSiO4 ]· xNaOH (Ln = Gd, Tb, Eu; x ≈ 0.2) was synthesized under relative mild hydrothermal conditions. Materials doped with both Tb 3+ and Eu 3+ perform as luminescent ratiometric thermometers, exhibiting a good relative thermal sensitivity at cryogenic temperature (<100 K), with maxima of 1.9 %K – 1 at 14 K and 6.2 %K – 1 at 12 K, respectively.