The role of Nd concentration in the modulation of the thermometric performance of Stokes/anti-Stokes luminescence thermometer in NaYF:Nd.

The growing popularity of luminescence thermometry observed in recent years is related to the high application potential of this technique. However, in order to use such materials in a real application, it is necessary to have a thorough understanding of the processes responsible for thermal changes in the shape of the emission spectrum of luminophores. In this work, we explain how the concentration of Nd dopant ions affects the change in the thermometric parameters of a thermometer based on the ratio of Stokes (F → I) to anti-Stokes (F,S → I) emission intensities in NaYF:Nd. It is shown that the spectral broadening of the I → F, H absorption band observed for higher dopant ion concentrations enables the modulation of the relative sensitivity, usable temperature range, and uncertainty of temperature determination of such a luminescent thermometer.