Effective strategy for properly evaluating the relative sensitivity of luminescence thermometry

Over the past few years, luminescence thermometry has been a hot research topic for its non-contact operating mode, high temporal and spatial resolution, and so forth. For luminescence thermometry, relative sensitivity is one of the most important parameters. However, this parameter has been wrongly presented in a lot of literatures. This study aims to solve such a problem. Here, single-band ratiometric (SBR) thermometry, one type of newly developed luminescence thermometry, is taken as an example to show the influence of calculation method on relative sensitivity. It is found that the same set of experimental data could be fitted well by several different empirical fitting curves. However, there are huge differences in the relative sensitivities predicted from these empirical fitting curves. Therefore, it is strongly recommended to take the definition of relative sensitivity as a gold criterion to evaluate whether the fitting curve is suitable.