Lanthanide (Ln³⁺) based ferroelectric phosphors, with an integration of PL emission and ferroelectric effect, are unveiling an exciting realm of possibilities for multifunctional ferroelectric-optic materials. However, how the ferroelectric host enables the tuning on the PL emissions through modulating the local structure (e.g., lattice site, symmetry, strains etc.) of the Ln³⁺ activator is not established yet. In this work, a luminescent-ferroelectric material, i.e. Dy³⁺ doped BaTiO₃ ceramic (Ba_1–xDy_xTiO₃ (x = 0∼0.07), abbr: BTO:Dy³⁺), was explored to address the aforementioned issues. The BTO:Dy³⁺ ceramics were synthesized by a solid-state reaction method. The crystal structure, photoluminescence (PL) and electric properties (dielectric constant, ferroelectric hysteresis and piezoelectric hysteresis loop) were systematically investigated. The BTO:Dy³⁺ ceramics show two predominant emission peaks, corresponding to the blue magnetic dipole transition (477 nm, ⁴F_7/2 → ⁶H_15/2) and yellow electric dipole transition (573 nm, ⁴F_7/2 → ⁶H_13/2), the intensity ration of which can be modulated by the ferroelectric polarization that causes the slight lattice deformation. Such a polarization-emission modulation combining with the Dy³⁺ doping could accelerate the color change, from yellow to blue, which is characterized to detect the phase transition, with a method and mechanism were proposed, that is, the phase change is reflected by the PL characteristic peak intensity ratio. Therefore, the current results offer a convenient photoluminescence method for detecting the ferroelectric phase transition and a feasible approach to study the interaction between the photoluminescence and polarization in ferroelectric materials, for providing new insights for the development of multifunctional materials.

镧系元素 (Ln ³⁺ ) 基铁电荧光体结合了 PL 发射和铁电效应，为多功能铁电光学材料开辟了令人兴奋的可能性领域。然而，铁电主体如何通过调节Ln ^{3+激活剂的局部结构（}例如，晶格位点、对称性、应变等）来实现PL发射的调谐尚未确定。在这项工作中，我们探索了一种发光铁电材料，即Dy ³⁺掺杂 BaTiO ₃陶瓷（Ba _{1– x} Dy _x TiO ₃ ( x  = 0∼0.07)，缩写：BTO:Dy ³⁺ ）来解决上述问题。问题。采用固相反应法合成了BTO:Dy ^3+陶瓷。系统地研究了晶体结构、光致发光（PL）和电性能（介电常数、铁电磁滞和压电磁滞回线）。BTO:Dy ³⁺陶瓷显示出两个主要发射峰，对应于蓝色磁偶极跃迁（477 nm，⁴ F _7/2  →  ⁶ H _15/2）和黄色电偶极跃迁（573 nm，⁴ F _7/2 ）  →  ⁶ H _13/2 )，其强度比可以通过引起轻微晶格变形的铁电极化来调制。这种偏振发射调制结合Dy ³⁺掺杂可以加速颜色从黄色到蓝色的变化，其特点是检测相变，并提出了一种方法和机制，即将相变反映为PL特征峰强度比。因此，本研究结果为检测铁电相变提供了一种便捷的光致发光方法，为研究铁电材料光致发光与极化之间的相互作用提供了可行的途径，为多功能材料的开发提供了新的见解。