Luminescence thermometry with Eu3+ doped GdAlO3

Eu3+ doped GdAlO3 powder synthesized by solid state reaction was investigated for аpplication in luminescence thermometry. Phase composition of material was confirmed by X-ray powder diffraction analysis. The photoluminescence emission spectra were collected under excitation of 399 nm, while elevating the temperature of the sample from the room temperature to 793 K. Emissions from 5D1→7F1 and 5D0→7F2 characteristic transitions of Eu3+ ions are selected for the temperature-dependence study using the fluorescence intensity ratio method. Emission decay curves measured at the strongest emission peak centered at 614 nm were recorded in a same temperature range. Data analysis showed that thermometry by fluorescence intensity ratio method can be used over the temperature region 293-793 K with the maximal relative sensitivity of 2.96% K−1 (at 293 K). Temporal dependence of emission (lifetime) provides temperature sensing from 620 to 793 K with the maximal relative sensitivity of 2.28% K−1.