Energy Transfer in Mixed Lanthanides Complexes: Towards High-Performance Pressure Sensors Based on the Luminescence Intensity Ratio
Résumé
In this study, we present a reversible pressure-sensing material with high sensitivity. Mixed βdiketonate complexes of Tb 3+ and Eu 3+ [(Ln)(acac) 3 phen] are synthesized with phenanthroline as an ancillary ligand. The organic ligands provide the antenna effect to make the Ln 3+ complex excitable at 405 nm. Eu 3+ emission results from efficient energy transfer (ET) from Tb 3+. Under 405 nm excitation, the emission intensity of Tb 3+ decreases whereas the emission intensity of Eu 3+ increases with pressure, making this complex a potential pressure sensor based on luminescent-intensity-ratio (LIR) up to 700 MPa. This study then discusses the application of this Tb 3+ /Eu 3+ complex for pressure sensing depending on measurement conditions. The addition of the optically neutral ion Y 3+ to the system can reduce the impact of pressure-induced structural defects on the emission, thus improving the reversibility of the LIR variation as a function of pressure. Therefore, a self-calibrating, reliable, and reversible pressure-sensing material is proposed here, with remarkable pressure sensitivity compared to a peak shift-based pressure sensor.
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