Temperature sensing from luminescence of Eu3+ - doped YAlO3 ceramics

Temperature dependent photoluminescence of Eu³⁺ doped YAlO₃ sample synthesized by solid state reaction was investigated for high-temperature phosphor thermometry. The photoluminescence spectra were collected under excitation of 399nm, elevating the temperature gradually from room temperature to 800K. Yttrium Aluminium Perovskite (YAP) doped with 4 at% of Eu³⁺ was synthesized by solid-state reaction, starting from Y2O₃ and Al2O₃. YAP's application in cancer treatment has been demonstrated. Although YAP luminescence was widely explored and used, there is only a single report on its use in luminescence thermometry. Thermographic Phosphors are usually ceramic materials doped with rare earth or transition metal ions, and their luminescence characteristics are significantly changing with the temperature fluctuations. Fluorescence intensity ratio method is based on comparison of two emission lines in photoluminescence spectrum. This method offers many advantages over the other luminescence thermometry methods, such as a wide temperature range, elimination of errors that are a consequence of excitation light fluctuations, and relatively high sensitivity of measurements.