The role of Nd(3+) concentration in the modulation of the thermometric performance of Stokes/anti-Stokes luminescence thermometer in NaYF(4):Nd(3+)

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(3+) dopant ions affects the change in the thermometric parameters of a thermometer based on the ratio of Stokes ((4)F(3/2) → (4)I(9/2)) to anti-Stokes ((4)F(7/2),(4)S(3/2) → (4)I(9/2)) emission intensities in NaYF(4):Nd(3+). It is shown that the spectral broadening of the (4)I(9/2) → (4)F(5/2), (2)H(9/2) 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.