Abstract
Abstract For achieving well-performing optical thermometry, a new type of dual-mode optical thermometer is explored based on the valley-to-peak ratio (VPR) and fluorescence lifetime of Eu3+ emissions in the ZrO2:Eu3+ nanocrystals with sizes down to 10 nm. In the VPR strategy, the intensity ratio between the valley (600 nm) generated by the emission band overlap and the 606 nm peak (5D0→7F2), which is highly temperature sensitive, is employed, giving the maximum relative sensing sensitivity (S r ) of 1.8% K−1 at 293 K and good anti-interference performance. Meanwhile, the 606 nm emission exhibits a temperature-dependent decay lifetime with the highest S r of 0.33% K−1 at 573 K, which is due to the promoted nonradiative relaxation with temperature. These results provide useful information for constructing high-performance dual-mode optical thermometers, which may further stimulate the development of photosensitive nanomaterials for frontier applications.
Highlights
Accurate temperature determination is required in many scientific and engineering areas
The results demonstrate that the current probe based on Eu3+:ZrO2 nanocrystals is versatile, highly sensitive, repeatable, and anti-interference, with the unique combination of valley-to-peak ratio (VPR) and lifetime techniques
The electron paramagnetic resonance (EPR) (German Magnettech, Berlin, Germany) spectra were measured by a Bruker A300-10/12 spectrometer at room temperature
Summary
Accurate temperature determination is required in many scientific and engineering areas. The FIR technique is based on the intensity ratio of two emission bands from thermally coupled levels (TCLs) of an RE ion [9, 10]. A new approach to designing the dualmode optical thermometer based on the highly temperature-dependent valley-to-peak ratio (VPR) and the fluorescence lifetime of Eu3+ emission in ZrO2 is proposed for the first time. At 361 nm, the temperature sensing behaviors based on the intensity ratio between the valley formed by the overlap of the emission bands and the fluorescent peak of Eu3+ ions (VPR = I600/I606) were investigated. The results demonstrate that the current probe based on Eu3+:ZrO2 nanocrystals is versatile, highly sensitive, repeatable, and anti-interference, with the unique combination of VPR and lifetime techniques
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