Eu3+-doped Y7O6F9 ceramic powder phosphor for optical thermometry based on fluorescence spectral techniques

Abstract

In recent years, optical thermometry performance of europium (Eu3+) doped phosphors has been studied by probing the temporal and spectral change of the fluorescence with temperature. In this scenario, the choice of the host material is important to maximize the temperature sensitivity. Yttrium oxyfluoride is an interesting host candidate because it combines low phonon energy of fluorides with high chemical and thermal stability of oxides. In this work, the combustion synthesis approach was used to produce Eu3+-doped Y7O6F9 powder phosphors. The Judd-Ofelt intensity parameters of the samples were calculated by the analysis of the fluorescence. When exposed to an externally-controlled change of the temperature, the fluorescence spectral profile of the sample changed. We observed that the relative temperature sensitivity estimated by the full-width at half-maximum and the valley-to-peak ratio methods were 0.08 and 0.35% K−1, respectively, at a temperature of 318 K, validating the phosphor for temperature sensing application.