MgTiO₃:Mn⁴⁺ a multi-reading temperature nanoprobe.

ABSTRACT: MgTiO₃ nanoparticles doped with Mn⁴⁺, with homogeneous size ranging about 63.1 ± 9.8 nm, were synthesized by a molten salt assisted sol gel method. These nanoparticles have been investigated as optical thermal sensors. The luminescence of tetravalent manganese ion in octahedral environment within the perovskite host presents drastic variations with temperature. Three different thermometry approaches have been proposed and characterized. Two luminescence intensity ratios are studied. Firstly between the two R-lines of Mn⁴⁺ emission at low temperature (-250 °C and -90 °C) with a maximal sensitivity of 0.9% °C^-1, but also secondly between ²E → ⁴A₂ (R-line) and the ⁴T₂ → ⁴A₂

SUBMITTER: Glais E 

PROVIDER: S-EPMC9080588 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature