Near-infrared optical nanothermometry via upconversion of Ho³⁺-sensitized nanoparticles.

ABSTRACT: Recently, materials revealing the upconversion (UC) phenomenon, which is a conversion of low-energy photons to higher-energy ones, have attracted considerable attention in luminescence thermometry due to the possibility of precise and remote optical thermal sensing. The most widely studied type of luminescent thermometry uses a ratiometric approach based on changes in the UC luminescence intensity, mainly of lanthanide ions' thermally coupled energy levels. In this work, NaYF₄:Ho³⁺@NaYF_4, and NaYF₄:Ho³⁺, Er³⁺@NaYF₄ nanoparticles (NPs) were synthesized by the controlled reaction in oleic acid and octadecene at 573 K. The obtained nanoparticles had hexagonal structures, oval shapes, and average sizes of 22.5 ± 2.2 n

SUBMITTER: Ryszczynska S 

PROVIDER: S-EPMC10491596 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature