Upconversion luminescence and temperature sensing properties of NaGd(WO₄)₂:Yb³⁺/Er³⁺@SiO₂ core-shell nanoparticles.

ABSTRACT: Optical thermometry based on the fluorescence intensity ratio (FIR) of two thermally coupled levels in lanthanide ions has potential application in non-contact optical temperature sensing techniques. In this work, a shell of SiO₂ with tunable thickness was uniformly coated on NaGd(WO₄)₂:Yb³⁺/Er³⁺ core upconversion nanoparticles (UCNPs). The effects of the silica shell on UC luminescence and thermal sensing properties of core-shell NaGd(WO₄)₂:Yb³⁺/Er³⁺@SiO₂ UCNPs were investigated. Under 980 nm laser excitation, the temperature-dependent UC emission spectra of obtained samples were measured. The FIR was analyzed based on the thermally coupled ²H_11/2 and ^4<

SUBMITTER: Zheng L 

PROVIDER: S-EPMC8694333 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature