The ability to reversibly control the luminescent properties of functional materials with diverse external stimuli, such as an electric field, strain, and temperature, is crucial for designing high-performance optical devices. Here, we demonstrate that a purely mechanical strain in a flexible mica substrate triggered by bending can be used to dramatically modify the photoluminescence response of a Pr-doped Ba_0.85Ca_0.15Ti_0.9Zr_0.1O₃ epitaxial thin film in a stable and repeatable manner with a large gauge factor of up to 6853. The strong dependence of the photoluminescence performance on the mechanical bending arises from strain-induced variations in the lattice symmetry of the host film and the local crystal field around the Pr³⁺. In particular, because of the nature of mica, the film structure exhibits excellent antifatigue characteristics after 10⁴ bending cycles as well as high optical transparency in the range of 450–780 nm. This study provides a viable route for exploring the correlation between structural symmetry and photoluminescence in ferroelectric thin-film systems and offers new possibilities for developing all-inorganic, reconfigurable, transparent and flexible light sources, photodetectors, and wearable sensors.

可逆地控制具有各种外部刺激（例如电场，应变和温度）的功能材料的发光特性的能力对于设计高性能光学器件至关重要。在这里，我们证明了弯曲触发的柔性云母基板中的纯机械应变可用于显着改变掺Pr的Ba _0.85 Ca _0.15 Ti _0.9 Zr _0.1 O ₃的光致发光响应。稳定且可重复的外延薄膜，其大规格因子高达6853。光致发光性能对机械弯曲的强烈依赖性是由应变引起的主体膜的晶格对称性变化和周围的局部晶场引起的Pr ³⁺。特别是，由于云母的性质，薄膜结构在10 ⁴之后表现出优异的抗疲劳特性。弯曲周期以及450-780 nm范围内的高光学透明度。这项研究为探索铁电薄膜系统中结构对称性与光致发光之间的相关性提供了一条可行的途径，并为开发全无机，可重构，透明和灵活的光源，光电探测器和可穿戴传感器提供了新的可能性。