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

authors	Trannoy, V; Neto, ANC; Brites, CDS; Carlos, LD; Serier-Brault, H
nationality	International
journal	ADVANCED OPTICAL MATERIALS
author keywords	europium; luminescent thermometers; metal-organic frameworks; Tb-to-Eu energy transfer; terbium
keywords	NONRADIATIVE ENERGY-TRANSFER; LANTHANIDE IONS; COORDINATION POLYMERS; CHEMICAL-BOND; TRANSITIONS; ABSORPTION; LIGHT; INTENSITIES; RELAXATION; COVALENCY
abstract	In the last decade, numerous Ln-bearing metal-organic frameworks (MOFs) have been reported for luminescence thermometry applications. Although the Ln(3+) 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 Ln(3+) emitting centers is presented that definitively determines the operating temperature range and the maximum relative sensitivity of the luminescent thermal probes.
publisher	WILEY-V C H VERLAG GMBH
issn	2195-1071
year published	2021
volume	9
issue	6
digital object identifier (doi)	10.1002/adom.202001938
web of science category	12
subject category	Materials Science, Multidisciplinary; Optics
unique article identifier	WOS:000606815900001