Piezophotonics is a great interesting field of physics that has led to a number of important technologies, such as light source, smart sensors, and mechatronics. In this work, we reported Pr-doped (Bi_0·5Na_0.5)TiO₃-based lead-free ceramics with strong red photoluminescence emission and large strain response (d₃₃∗ = 460 pm/V, S = 0.32 %). The PL emission can be quenched by decreasing the intensity by 93 % after electrical polarization (E = 50 kV/cm). The local structure and electric field-induced structural changes were systematically investigated to reveal the significant distinction in photoluminescence properties caused by electrical polarization. The results indicated that polarization treatment eliminates the structural inhomogeneities and establishes a long-range ferroelectric tetragonal and rhombohedral distortion. The crystal structure transformed irreversibly from a non-ergodic to a normal ferroelectric state. PL quenching originated from the decreased distortion of octahedral due to the transition from a non-ergodic state to a highly ordered symmetrical structure. Meanwhile, the enlarged domain structure contributed to the photoluminescence quenching effect. Our findings demonstrate that an electric field can be a robust tool for adjusting the photoluminescence property and provide insights into the relationship between the structure and PL properties of BNT-based ceramics under an external stimulus.

压电光子学是一个非常有趣的物理学领域，它催生了许多重要的技术，例如光源、智能传感器和机电一体化。在这项工作中，我们报道了具有强红色光致发光和大应变响应（ d ₃₃ * = 460 pm/V, S  = 0.32 %）的Pr掺杂（Bi _0·5 Na _0.5）TiO ₃基无铅陶瓷。PL 发射可以通过在电极化后降低 93% 的强度来淬灭（E = 50 千伏/厘米）。系统地研究了局部结构和电场引起的结构变化，以揭示由电极化引起的光致发光特性的显着差异。结果表明，极化处理消除了结构的不均匀性，并建立了长程铁电四方和菱面体畸变。晶体结构从非遍历状态不可逆地转变为正常的铁电状态。PL 淬火源于八面体变形减少，这是由于从非遍历状态转变为高度有序的对称结构。同时，扩大的畴结构有助于光致发光猝灭效应。