AbstractThis research is focused on the temperature sensing ability of perovskite SrZrO₃:Eu³⁺ 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:Eu³⁺ consisted of two regions. One region was associated with SrZrO₃ trap emission, and the other one was related to the emission of Eu³⁺ ions. The intensity ratio of the emission of Eu³⁺ ions to the host emission (FIR) and the emission lifetime of Eu³⁺ 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:Eu³⁺ for the distinct high temperature sensing applications.