Upconversion enhancement and temperature sensing studies in Li⁺ ions incorporated GdPO₄:Tm³⁺/Yb³⁺ phosphor.

ABSTRACT: The GdPO₄:Tm³⁺/Yb³⁺ phosphor codoped with various concentrations of Li ⁺ ions were synthesized for upconversion emission and optical thermometry studies. Excitation using 980 nm laser diode results in three upconversion (UC) emission bands with centre wavelengths of 478, 648 and 692 nm. These bands are originated from ¹G₄→³H₆, ¹G₄→³F₄, and ³F₃→³H₆ transitions of the Tm³⁺ ion, respectively. Li⁺ ions modified the local crystal symmetry around dopant ions, resulting enhanced UC emissions. The lifetime of the ¹G₄ level of Tm³⁺ ion was studied using a 980 nm laser exc

SUBMITTER: Upadhyay MM 

PROVIDER: S-EPMC11620039 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature