Photoluminescent Thermometer Based on a Phase-Transition Lanthanide Silicate with Unusual Structural Disorder
authors Ananias, D; Paz, FAA; Yufit, DS; Carlos, LD; Rocha, J
nationality International
journal JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
keywords X-RAY PHOSPHORS; LIQUID-CRYSTALS; TB-III; EU-III; TEMPERATURE; NANOTHERMOMETERS; NANOPARTICLES; NANOCRYSTALS; LUMINESCENCE; AMPLIFIERS
abstract The hydrothermal synthesis of the novel Na[LnSiO(4)] (Ln = Gd, Eu, Tb) disordered orthorhombic system is reported. At 100 K, and above, these materials are best described in the centrosymmetric orthorhombic Pnma space group. At lower temperatures (structure solved at 30 K) the unit cell changes to body-centered with Imma symmetry. The materials exhibit unique photophysical properties, arising from both, this phase transformation, and the disorder of the Ln(3+) ions, located at a site with D-2d point symmetry. Na[(Gd0.8Eu0.1Tb0.1)SiO4] is an unprecedented case of a luminescent ratiometric thermometer based on a very stable silicate matrix. Moreover, it is the first example of an optical thermometer whose performance (viz., excellent sensitivity at cryogenic temperatures <100 K) is determined mainly by a structural transition, opening up new opportunities for designing such devices.
publisher AMER CHEMICAL SOC
issn Feb-63
year published 2015
volume 137
issue 8
beginning page 3051
ending page 3058
digital object identifier (doi) 10.1021/ja512745y
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000350614700039
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journal impact factor 14.357
5 year journal impact factor 13.613
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