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http://hdl.handle.net/10773/19319
Title: | Photoluminescent Thermometer Based on a Phase-Transition Lanthanide Silicate with Unusual Structural Disorder |
Author: | Ananias, Duarte Almeida Paz, Filipe A. Yufit, Dmitry S. Carlos, Luis D. Rocha, Joao |
Keywords: | X-RAY PHOSPHORS LIQUID-CRYSTALS TB-III EU-III TEMPERATURE NANOTHERMOMETERS NANOPARTICLES NANOCRYSTALS LUMINESCENCE AMPLIFIERS |
Issue Date: | 2015 |
Publisher: | AMER CHEMICAL SOC |
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. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19319 |
DOI: | 10.1021/ja512745y |
ISSN: | 0002-7863 |
Publisher Version: | 10.1021/ja512745y |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Photoluminescent Thermometer Based on a Phase-Transition Lanthanide Silicate with Unusual Structural Disorder_10.1021ja512745y.pdf | 4.93 MB | Adobe PDF |
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