Poling effect on optical and dielectric properties of Pr3+-doped Na0.5Bi0.5TiO3 ferroelectric single crystal

In recent years, with increased environmental awareness, more and more research has been carried out for lead-free ferroelectric materials. Among such materials, Na0.5Bi0.5TiO3 (NBT) single crystal has become a material of interest due to its high Curie temperature. In this study, Pr-doped NBT crystals were prepared and poled along different crystal orientations. The effects of different crystal orientations and poling on the optical properties of Pr-doped NBT crystals were investigated. The optical transmission of the crystal decreases after poling along the [001] orientation and increases after poling along the [111] orientation. The emission and excitation spectra show that the poled process enhances the crystal luminescence. The dielectric constant dependence on temperature for different crystal orientations was measured. The domain structure was measured to explain the changes in the optical properties. The optical properties of a Pr-doped NBT single crystal were modulated by poling along different crystal orientations, which is expected to improve the performance of optoelectronic devices based on such materials.