Abstract
In this work, we report the multifunctional character of neodymium-doped
LaF3 core/shell nanopartides. Because of the spectral overlap of the
neodymium emission bands with the transparency windows of human tissues,
these nanoparticles emerge as relevant subtissue optical probes. For
neodymium contents optimizing the luminescence brightness of Nd3+: LaF3
nanoparticles, subtissue penetration depths of several millimeters have
been demonstrated. At the same time, it has been found that the infrared
emission bands of Nd3+:LaF3 nanoparticles show a remarkable thermal
sensitivity, so that they can be advantageously used as luminescent
nanothermometers for subtissue thermal sensing. This possibility has
been demonstrated in this work: Nd3+: LaF3 nanopartides have been used
to provide optical control over subtissue temperature in a single-beam
plasmonic-mediated heating experiment. In this experiment, gold nanorods
are used as nanoheaters while thermal reading is performed by the Nd3+:
LaF3 nanoparticles. The possibility of a real single-beam-controlled
subtissue hyperthermia process is, therefore, pointed out.
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