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- W2893036787 abstract "Exploring the thermometric properties of UCNPs is of great importance for non-contact fluoresce thermometers. Ln-doped β-NaGdF4:Yb3+,Er3+ upconversion nanoparticles (UCNPs) have been fabricated by varying the ratio of citric ions to molecules in precursor. Morphology of the as-prepared β-NaGdF4:Yb3+,Er3+ UCNPs turns from hexagonal prisms to agglomerations of smaller particles with decreased dimension. Luminescence intensity decreases and red-to-green ratio increases with increasing ratio of citric ions to molecules. A dual-mode thermometric property has been found in the as-prepared β-NaGdF4:Yb3+,Er3+ UCNPs. The first mode derives from the temperature dependent fluoresce-intensity-ratios of thermally coupled manifolds of Er3+ (2H11/2) and (4S3/2) manifolds, of which the maximum relative sensitivity value is 0.0036 K−1. The other mode derives from temperature dependent red-to-green ratios, which is a linear function of temperature and the maximum relative sensitivity value is 0.0238 K−1. The β-NaGdF4:Yb3+,Er3+ UCNPs with morphology of agglomerations of smaller particles with high surface-to-volume ratios show advanced sensitivities, which are suitable for noncontact optical thermometer." @default.
- W2893036787 created "2018-10-05" @default.
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- W2893036787 date "2019-02-01" @default.
- W2893036787 modified "2023-09-24" @default.
- W2893036787 title "Regulation of morphologies and luminescence of β-NaGdF4:Ybc+,Er3+ upconversion nanoparticles by hydrothermal method and their dual-mode thermometric properties" @default.
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- W2893036787 doi "https://doi.org/10.1016/j.apsusc.2018.09.209" @default.
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