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Development of new approaches to the noncontact optical thermometry is of great importance for modern science and technology. In the current work, single-phase YVO 4 :Eu 3+ nanoparticles prepared via the modified Pechini technique were studied as luminescence thermometers. Thermal sensing was performed using two different ratiometric approaches: utilizing the luminescence intensity ratio between transitions emitted from two thermally coupled excited levels (emission spectrum) and between transitions originating from different thermally coupled low-lying levels (excitation spectrum). The first technique allows determining temperature within the 298−873 K range, whereas the second one allows determining temperature within 298−473 K. The spectral position of the 5 D 0 (1)− 7 F 1 (2) band was also suggested as a temperaturedependent parameter. Thermometric performance of YVO 4 :Eu 3+ nanophosphors including absolute and relative sensitivities, minimum temperature uncertainty, and repeatability was obtained and discussed.

The position of activator ions in the lattice has a fundamental effect on the luminescent properties of phosphors.