Pr3+-doped perovskite niobate ceramics towards improving performance of optical temperature sensor by second harmonic generation (SHG) combined with lanthanide luminescence. (1st May 2023) - Soler-Carracedo, Kevin
Abstract: (Kx Na1-x ) NbO3 (KNN) perovskite ceramics doped with Pr 3+ ions were successfully synthesized. Under pulsed laser excitation, the KNN: Pr 3+ material shows intense Pr 3+ down-shifting luminescence combined with color-tunable, excitation wavelength-dependent second-harmonic generation (SHG) phenomena. The intensity ratio between the Pr 3+ emission bands, as well as between the Pr 3+ and the SHG signal were analyzed as a function of temperature. The intensity ratio from Pr 3+ emission bands of I610 /I655 has a maximum relative sensitivity of 6.41 %K −1 at 420 K. In the case of the ISHG /I610 ratio, the maximum sensitivity of 5.93 %K −1 at 560 K was obtained. Temperature resolutions were also analyzed, with the ISHG /I610 ratio showing minimum values of 0.07 K compared to the minimum of 0.105 obtained for the I610 /I655 ratio. Worth mentioning that the use of SHG allows to increase the working range of the thermal sensor more than 140 K, as the ratio between Pr 3+ emission bands could not be measured further than 420 K due to the thermal quenching effect of the 3 P0 → 3 F2 transition. The developed thermometer can be used as a highly-sensitive, dual-mode (multi-parameter) temperature sensor, i.e., combining luminescence thermometry and SHG based thermometry. Graphical abstract: Image 1