Enhancing thermometric efficiency: a wavelength excitation analysis in LiSrGdWO:Tb for superior single band ratiometric (SBR) thermometry.

This study delves into the Single Band Ratiometric (SBR) method for luminescence thermometry, specifically employing Tb-doped LiSrGdWO (LSGW) as a novel phosphor. The prepared samples crystallize with the tetragonal scheelite structure, with the optimal Tb concentration pinpointed at 0.3Tb ions. When stimulated at diverse wavelengths exhibit luminescence characterized by varying heat dependencies. By utilizing two Fluorescence Intensity Ratio (FIR) parameters for the 544 nm green emission, firstly excited at 405 nm and 488 nm, and then at 405 nm and 379 nm, the relative thermal sensitivity of the luminescent thermometer peaks at 3.56% K and 4.21% K, respectively, within the temperature range of 290-440 K. The temperature resolution (δ) of the luminescent thermometer is calculated to be δ = 0.68 K and δ = 0.75 K for = 290 K, respectively. These outcomes underscore the applicability of Tb ions for SBR thermometry, emphasizing the impact of the excitation wavelength on the thermal sensitivity. The study lays the groundwork for developing highly sensitive temperature probes by elucidating the interplay of material properties and physical processes.