Apparent self-heating of individual upconverting nanoparticle thermometers.

ABSTRACT: Individual luminescent nanoparticles enable thermometry with sub-diffraction limited spatial resolution, but potential self-heating effects from high single-particle excitation intensities remain largely uninvestigated because thermal models predict negligible self-heating. Here, we report that the common "ratiometric" thermometry signal of individual NaYF₄:Yb³⁺,Er³⁺ nanoparticles unexpectedly increases with excitation intensity, implying a temperature rise over 50 K if interpreted as thermal. Luminescence lifetime thermometry, which we demonstrate for the first time using individual NaYF₄:Yb³⁺,Er³⁺ nanoparticles, indicates a similar temperature rise. To resolve this apparent contradiction between model and experiment, we sy

SUBMITTER: Pickel AD 

PROVIDER: S-EPMC6249317 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature