Engineering of Mixed Eu3+/Tb3+ Metal‐Organic Frameworks Luminescent Thermometers with Tunable Sensitivity

In the last decade, numerous Ln‐bearing metal‐organic frameworks (MOFs) have been reported for luminescence thermometry applications. Although the Ln3+ composition is always thoroughly determined, this parameter is never optimized to improve thermometric performances. Here, the optimization of therm...

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Bibliographic Details
Published in:Advanced optical materials 2021-03, Vol.9 (6), p.n/a
Main Authors: Trannoy, Virgile, Carneiro Neto, Albano N., Brites, Carlos D. S., Carlos, Luís D., Serier‐Brault, Hélène
Format: Article
Language:English
Subjects:
Energy transfer
Europium
luminescent thermometers
Materials science
Metal-organic frameworks
Operating temperature
Optics
Optimization
Sensitivity
Tb‐to‐Eu energy transfer
Terbium
Thermometers
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Summary:In the last decade, numerous Ln‐bearing metal‐organic frameworks (MOFs) have been reported for luminescence thermometry applications. Although the Ln3+ composition is always thoroughly determined, this parameter is never optimized to improve thermometric performances. Here, the optimization of thermometric performances of luminescent probes is tackled by reporting a series of mixed Eu3+–Tb3+ metal‐organic frameworks. The thermometric performances are accessed as a function of the Eu3+ content yielding a maximum relative sensitivity between 0.19 and 0.44% K−1 registered at temperatures between 340 and 240 K, respectively. A meticulous theoretical investigation of the Tb3+‐to‐Eu3+ energy transfer in the series of mixed Eu3+–Tb3+ MOFs is also performed to determine the predominant pathway of the energy transfer. For the first time, a clear evidence of the significant influence of the Eu/Tb ratio on the energy transfer between Ln3+ emitting centers is presented that definitively determines the operating temperature range and the maximum relative sensitivity of the luminescent thermal probes. Here is reported the tuning of the relative thermal sensitivity in a series of Eu–Tb mixed metal‐organic framework luminescent thermometers. The sensitivity and the temperature range are modulated by an accurate control of the Eu/Tb ratio. Theoretical calculations highlight that the chemical composition directly impacts the Tb‐to‐Eu energy transfer rate.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202001938