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Anomalous Temperature-Dependent Upconversion Luminescence of α-NaYF4:Yb3+/Er3+ Nanocrystals Synthesized by a Microwave-Assisted Hydrothermal Method

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Yb3+/Er3+co-doped cubic-(α-) phase NaYF4 nanocrystals were prepared through a microwaveassisted hydrothermal method. Temperature-dependent upconversion luminescence (UCL) and sensing properties were systematically studied. It is interesting that anomalous temperaturedependent UCL behavior is observed. With increasing temperature (303–573 K), the UCL intensity of Er3+ does not quench monotonously but reaches a minimum around 483 K and then increases. However, it was found that the UCL spectra change in a different way with decreasing temperature (573–303 K) from the one measured with increasing temperature. The fluorescence intensity ratio of 2H11/24I15/2 to 4S3/24I15/2 at any measured temperature point remains almost constant in all measurement processes, indicating the consistency of temperature in each spectrum measurement at all temperature points regardless of the heating or the cooling process in our experiments. The results demonstrate that NaYF4:Yb3+/Er3+ UC nanocrystal has good sensing stability and may have potential application in the nanoscale thermal sensor.
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Document Type: Research Article

Publication date: January 1, 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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