One of the main challenge that is currently facing scientists in the field is to use luminescent thermometry for unveiling thermometers’ local surrounding properties, as, for instance, heat transfer in heater-thermometer nanoplatforms , the absorption coefficient and thermal diffusivity of tissues in small animals  and the measurement of the instantaneous ballistic velocity of Brownian nanocrystals suspended in both aqueous and organic solvents based on upconversion nanothermometry .
This lecture presents a general revision of the work done in the last couple of years on ratiometric luminescent nanothermometers with foucus on recent examples in which the technique was used for unveiling thermometers’ local surrounding properties.
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