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Yb/Er/Tm tri-doped Na3ZrF7 upconversion nanocrystals for high performance temperature sensing
摘要： Non-contact optical thermometry based on fluorescence intensity ratio (FIR) technique has been widely researched over the past few decades. However, the reported systems exhibit two important shortcomings including the existence of a few interferential signals in addition to the required spectral bands for FIR and the absence of internal standard for reference signal. Herein, only two emission bands of Er3+: 4F9/2→4I15/2 (~673 nm) and Tm3+: 3H4 → 3H6 (~800 nm) are achieved in Yb/Er/Tm tri-doped Na3ZrF7 nano-system. Moreover, the upconversion (UC) emission intensity of Er3+ keeps unchanged with the rising of temperature, which is applied as reference signal; while that of Tm3+ enhances evidently, which is applied as temperature signal. The calculated maximum absolute temperature sensitivity (Sa) and relative temperature sensitivity (Sr) are 0.17 K-1 at 393 K and 1.76 %K-1 at 313 K, respectively.
关键词： Na3ZrF7 nanocrystals,self-reference,rare earth ions,temperature sensor,upconversion
更新于2025-11-14 17:04:02
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Rapid Separation of Enantiomeric Impurities in Chiral Molecules by a Self-Referential Weak Measurement System
摘要： We propose a self-referential fast detection scheme for a frequency domain weak measurement system for the detection of enantiomeric impurities in chiral molecules. In a transmissive weak measurement system, the optical rotation (OR) is used to modify the pre-selected polarization state and the post-selection polarization state. We obtained the sum and difference of the optical rotations produced by the sample and the standard by rotating the quarter wave plate in the system. Then, we estimate the ratio of chiral molecules to enantiomeric impurities using the ratio of the central wavelength shifts caused by the addition and subtraction states described above. In this paper, our system has an optical resolution of 1.88 × 10?5?. At the same time, we completed the detection of the ratio of the two substances in the mixture of L-proline and D-proline in different proportions, which proved that our system can quickly detect the content of enantiomeric impurities in chiral molecules.
关键词： enantiomeric impurity content detection,common light path system,weak measurement,self-reference
更新于2025-09-09 09:28:46