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Enhancing Upconversion Luminescence by Annealing Processes and High Temperature Sensing of ZnO:Yb/Tm Nanoparticles

Abstract

Temperature that affects upconversion luminescence (UCL) is important to biological sensing and magnetic imaging. The temperature-dependent UCL of ZnO:Yb3+/Tm3+ nanoparticles (UCNP) was characterized. A detailed analysis of UCL spectra, especially at different annealing temperatures, revealed the effects of annealing temperatures. The annealing temperatures were determined by using TGA. The blue and the red UCL emissions under NIR 980 nm excitation were greatly enhanced with an increase of annealing temperature from 300 to 780℃. The change of high-frequency groups (OH- and CO32-) at different annealing temperature were investigated via using IR technique. It was found that the quenching centers was removed due to an increase of annealing temperature. Moreover, for the temperature range from 293 to 338K, thermal sensor based on the position shift of the 475nm wavelength has been studied. In addition, relative sensor sensitivity reached a maximum 2.1%K at 293K based on temperature- dependent fluorescence intensity ratio (FIR) of 700 and 800nm upconverted emission, which would make the ZnO:Yb3+/Tm3+ nanoparticles a promising candidate for biological temperature probe.

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Publication details

The article was received on 24 Apr 2017, accepted on 04 Jun 2017 and first published on 14 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ01358B
Citation: New J. Chem., 2017, Accepted Manuscript
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    Enhancing Upconversion Luminescence by Annealing Processes and High Temperature Sensing of ZnO:Yb/Tm Nanoparticles

    Y. Li, Y. Li, R. Wang, Y. Xu and W. Zheng, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01358B

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