Ferroelectric ceramics exhibiting photochromic behavior and reversible luminescence modulation are highly desirable for optoelectronic applications ranging from information storage, displays, anti-counterfeiting to photo-switching devices. Herein, Sm³⁺-doped lead-free 0.85(K_0.5Na_0.5)NbO₃-0.15SrZrO₃ (KNN-SZ: Sm³⁺) transparent ferroelectric ceramic featuring a typical photochromic phenomenon is designed and demonstrated. Upon alternate illumination and thermal stimulus (220 ℃ for 1 min), the ceramic exhibits reversible yellow-gray coloration. Furthermore, a maximum relative reflectivity variation of 29 % and a large luminescence quenching of 65.4 % with superior fatigue resistance were achieved in KNN-SZ: Sm³⁺. Various in-situ illuminations and thermal treatments in different ambient conditions were carried out to bring insight into the trapping and de-trapping processes involved in photochromic behavior. The KNN-SZ: Sm³⁺ photochromic ceramics have great prospect in optoelectronic devices expanding the applications of KNN-SZ ceramics into advanced multifunctional materials for devices integration beyond electrical energy storage, electrocaloric and piezoelectric effects.

表现出光致变色行为和可逆发光调制的铁电陶瓷非常适用于从信息存储，显示，防伪到光开关器件的光电应用。此处，Sm ³⁺掺杂的无铅0.85（K _0.5 Na _0.5）NbO ₃ -0.15SrZrO ₃（KNN-SZ：Sm ³⁺设计并演示了具有典型光致变色现象的透明铁电陶瓷。在交替照明和热刺激（220℃下持续1分钟）后，陶瓷呈现可逆的黄灰色着色。此外，在KNN-SZ：Sm ³⁺中实现了29％的最大相对反射率变化和65.4％的大发光淬灭，具有出色的抗疲劳性。在不同的环境条件下进行了各种原位照明和热处理，以深入了解与光致变色行为有关的捕获和去捕获过程。KNN-SZ：Sm ³⁺ 光致变色陶瓷在光电器件中具有广阔的前景，它将KNN-SZ陶瓷的应用扩展到用于设备集成的先进多功能材料，而不仅限于电能存储，电热和压电效应。