Calibration of remote nanothermometers using nanoparticles of NaYF 4 : Er 3+ , Yb 3+ , Nd 3+

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Bravo S.
Mauricio D.
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Institute of Physics Publishing
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The nanoparticles of NaYF4: Er3+, Yb3+, Nd3+ present fluorescent emissions by upconversion. These emissions are associated with the doping ions of Er, Yb and Nd in the NaYF4 nanoparticles. The nanoparticles of NaYF4 doped with Er3+ and Yb3+ ions produce upconversion radiation when excited by 980 nm wavelength laser. By incorporating the Nd3+ ions, the NaYF4: Er3+, Yb3+, Nd3+ arrangement is formed, which produces the same excitation with an 880 nm wavelength laser, the product of a cross-transfer process between the Nd, the Yb and the Er. For applications in human tissue it is preferable to use a 880 nm wavelength laser. These nanoparticles of NaYF4: Er3+, Yb3+, Nd3+ have been synthesized in our laboratories with Y (79,3%), Yb (18%), Er (2%) and Nd (0,7%). In this work we have studied the fluorescence behavior of these nanoparticles, which correspond to the transitions 2H11/2 → 4I15/2 y4S3/2 → 4I15/2, and that can be used in the calibration of a remote nanothermometer, because they have a sensitivity to very small changes in temperature.
This work has been financed by the FONDECYT-CONCYTEC (agreements No. 167 and No.168) and developed in the Photonics Laboratory of the Faculty of Sciences of the Universidad Nacional de Ingenier´ıa
Palabras clave
Yttrium compounds, Calibration, Erbium compounds, Fluorescence, Fluorine compounds, Ions, Laser excitation, Nanoparticles, Neodymium, Sodium compounds, Synthesis (chemical), Ytterbium, 880 nm wavelength lasers, Fluorescence behaviors, Fluorescent emission, Human tissues, Nanothermometer, Transfer process, Up-conversion, Wavelength lasers