Fluorescence intensity ratio for BaHfO₃:Eu³⁺ temperature sensor

We use 395 nm ultraviolet radiation to excite the matrix of barium hafnate doped with europium ions to develop an optical temperature sensor. Luminescent analysis as a function of temperature was performed in the physiological range. The Emission spectra showed significant variations in luminescent intensity at all transitions, obtaining a relative sensitivity of 1574.3/T², when the temperature of the material increases from 289.7 to 323.8 K. The ⁵D₀ -> ⁷F₂ transition presented the better temperature resolution (1.1 × 10² K).