α-NaYF<inf>4</inf>:Yb<sup>3+</sup>-Tm<sup>3+</sup>@CaF<inf>2</inf> nanocrystals for NIR-to-NIR temperature sensing

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Journal Article
Chemical Physics Letters, 2017, 667 pp. 206 - 210
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© 2016 The approach of lanthanides doping upconversion temperature sensing exhibits high superiority in bioscience. However, most of the upconversion nanothermometers show their fluorescences temperature sensing beyond biological transparent window (650–950 nm) while suffering from the interference of surrounding environment. Here we report a nanoprobe with ultrasmall size, i.e. α-NaYF4:Yb-Tm@CaF2 nanocrystal, which has a sensitive capability to realize NIR-to-NIR temperature sensing. Temperature sensing sensitivities through 3H4 → 3H6 and 1G4 → 3H6 transitions of Tm3+ ions are evaluated in temperature region of 313–373 K. The results indicate that α-NaYF4:Yb-Tm@CaF2 nanocrystal is a promising candidate for biological temperature sensing.
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