title: Structural evaluations and temperature dependent photoluminescence characterizations of Eu(3+)-activated SrZrO3 hollow spheres for luminescence thermometry applications.
abstract: This research is focused on the temperature sensing ability of perovskite SrZrO3:Eu(3+) hollow spheres synthesized via the sol-gel method followed by heating. The Rietveld refinement indicated that the precursors annealed at 1100 °C were crystallized to form orthorhombic SrZrO3. SrZrO3 particles exhibited non-agglomerated hollow spherical morphology with an average particle size of 300 nm. The UV-excited photoluminescence spectrum of SrZrO3:Eu(3+) consisted of two regions. One region was associated with SrZrO3 trap emission, and the other one was related to the emission of Eu(3+) ions. The intensity ratio of the emission of Eu(3+) ions to the host emission (FIR) and the emission lifetime of Eu(3+) ions were measured in the temperature range of 300-550 K. The sensitivity obtained via the lifetime method was 7.3× lower than that measured via the FIR. Within the optimum temperature range of 300-460 K, the as-estimated sensor sensitivity was increased from 0.0013 to 0.028 K(-1). With a further increase in temperatures, the sensitivity started to decline. A maximum relative sensitivity was estimated to be 2.22%K(-1) at 460 K. The resolutions in both methods were below 1K in the above temperature range. The results indicated the suitability of SrZrO3:Eu(3+) for the distinct high temperature sensing applications.
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, ROC.
authors.forename: Subrata
authors.initials: S
authors.lastname: Das
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, ROC.
authors.forename: Sudipta
authors.initials: S
authors.lastname: Som
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, ROC.
authors.forename: Che-Yuan
authors.initials: CY
authors.lastname: Yang
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, ROC.
authors.forename: Sudam
authors.initials: S
authors.lastname: Chavhan
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, ROC.
authors.forename: Chung-Hsin
authors.initials: CH
authors.lastname: Lu