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Sensing temperature with Tb-Eu-based luminescent thermometer: A novel approach to increase the sensitivity
To obtain ratiometric temperature sensor with high sensitivity we have synthesized three rows of bimetallic Tb-Eu hydroxybenzoates, whose sensitivity was expected to exceed the theoretical limit due to the presence of the temperature-dependent OH-quenching. Single crystals of two new bimetallic comp...
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Published in: | Sensors and actuators. A. Physical. 2022-10, Vol.345, p.113787, Article 113787 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | To obtain ratiometric temperature sensor with high sensitivity we have synthesized three rows of bimetallic Tb-Eu hydroxybenzoates, whose sensitivity was expected to exceed the theoretical limit due to the presence of the temperature-dependent OH-quenching. Single crystals of two new bimetallic complexes were obtained, and their crystal structures were determined. Despite europium complexes with the selected ligands do not emit light, bimetallic Tb-Eu complexes with 3- and 4-hydroxybenzoates demonstrate europium luminescence with the quantum yield up to 77 %. Selected 3- and 4-hydroxybenzoates demonstrated temperature-dependent luminescence in the range of 25–100 °C. For 3-hydroxybenzoate of Tb-Eu, thermometer sensitivity reached 4 %/°C at 100 °C, which exceeds the expected limit of 3.3 %/°C at this temperature and is the highest reported value at this temperature. Temperature resolution is about 3 °C.
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•Bimetallic Tb-Eu hydroxybenzoate formation increases europium luminescence efficiency from 0 % to up to 77 %.•Tb-Eu 3- and 4-hydroxybenzoates demonstrate temperature-dependent luminescence in the range of 25–100 °C.•The sensitivity reached 4 %/°C at 100 °C, which exceeds the theoretical limit.•Temperature resolution is about 3 °C. |
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ISSN: | 0924-4247 1873-3069 |
DOI: | 10.1016/j.sna.2022.113787 |