Herein, we report significantly enhanced photoluminescence in Pr-doped (Bi0.5Na0.5)TiO3-BaTiO3 ceramics induced by electric field poling. The photoluminescence (PL) intensity enhancement rates (ΔPL) initially increased and subsequently decreased with increasing the poling electric field, reaching maximum values of 47.95% and 36.05% for 0.93(Bi0.5Na0.5)0.996TiO3-0.07BaTiO3-0.004Pr (BNBT-0.004Pr) and 0.93(Bi0.5Na0.5)0.988TiO3-0.07BaTiO3-0.012Pr (BNBT-0.012Pr) ceramics after poling under electric fields of 30 and 40 kV/cm, respectively. The observed ΔPL enhancement was attributed to structural inhomogeneity arising from the formation of the P4mm phase and the tetragonal-to-rhombohedral phase transition. Further increases in the poling electric field resulted in a decrease in ΔPL intensity, which was attributed to non-180° domain switching and the disappearance of heterojunctions induced by the higher poling electric field. Additionally, an excellent piezoelectric constant of 189 pC/N was achieved in the BNBT-0.004Pr ceramic. This study provides a comprehensive theoretical and experimental framework for the development and practical application of optoelectronic devices, highlighting the significant potential for advancing multifunctional materials and integrated device systems.
Zhang et al. (Mon,) studied this question.