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Simultaneous phase and size manipulation in NaYF4:Er3+/Yb3+ upconverting nanoparticles for non-invasion optical thermometer

Abstract

A series of Er3+/Yb3+-codoped NaYF4 upconverting nanoparticles were synthesized via a hydrothermal method. By controlling the synthetic temperature, the phase transition and particle manipulation were simultaneously realized in the studied compounds. Upon the irradiation of near-infrared light, the prepared nanoparticles revealed dazzling visible emissions arising from the intra-4f transitions of Er3+ ions. Moreover, the pump power-dependent upconversion (UC) emission spectra were recorded to analyze the involved UC mechanism. Furthermore, the temperature sensing behaviors of the resultant compounds were investigated by analyzing the temperature-dependent green emission intensities from the thermally coupled levels of 2H11/2 and 4S3/2. It is found that the sensor sensitivity of the synthesized samples is dependent on the synthetic temperature which is further confirmed by the Judd-Ofelt theory. Additionally, the sensor sensitivity of the prepared nanoparticle is also found to be dependent on the laser pump power. The Er3+/Yb3+-codoped NaYF4 upconverting nanoparticles sintered at 160 °C exhibited the optimum thermometric properties with a maximum sensor sensitivity of 0044 K-1 at 637 K when the excitation pump power is 139 mW. The adjustment of the synthetic temperature and excitation pump power is promising channels to manipulate the sensor sensitivity of the Er3+/Yb3+-codoped NaYF4 upconverting nanoparticles.

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Publication details

The article was received on 23 Aug 2017, accepted on 06 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ03165C
Citation: New J. Chem., 2017, Accepted Manuscript
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    Simultaneous phase and size manipulation in NaYF4:Er3+/Yb3+ upconverting nanoparticles for non-invasion optical thermometer

    P. Du, A. M. Deng, L. Luo and J. S. Yu, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03165C

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