Abstract
The authors describe an ethylene glycol assisted precipitation method for synthesis of Er(III)/Yb(III)-doped BiF3 nanoparticles (NPs) at room temperature. Under 980-nm light irradiation, the NPs emit upconversion (UC) emission of Er(III) ions as a result of a two-photon absorption process. The temperature-dependent green emissions (peaking at 525 and 545 nm) are used to establish an unambiguous relationship between the ratio of fluorescence intensities and temperature. The NPs have a maximum sensitivity of 6.5 × 10−3 K−1 at 619 K and can be applied over the 291–691 K temperature range. The results indicate that these NPs are a promising candidate for optical thermometry.
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Acknowledgements
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2017R1A2B4011998).
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Du, P., Yu, J.S. Synthesis of Er(III)/Yb(III)-doped BiF3 upconversion nanoparticles for use in optical thermometry. Microchim Acta 185, 237 (2018). https://doi.org/10.1007/s00604-018-2777-7
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DOI: https://doi.org/10.1007/s00604-018-2777-7