Grain-Orientation dependence about luminescence modulation behavior upon electric polarization in Sm³⁺ doped KSr₂Nb₅O₁₅ textured ceramics

Sm³⁺ doped KSr₂Nb₅O₁₅ textured ceramics with grain-orientation were fabricated using tape casting technology. The influences of the grain orientation on the microstructures, dielectric and ferroelectric properties were characterized. Moreover, the samples possessed luminescence modulation behavior after polarization, which exhibited obvious grain-orientation dependence. A considerable modulation ratio of approximately 69% was obtained along the [00l] direction of textured ceramics, which was almost twice that of ceramics without grain orientation. This work provided a new strategy for the enhancement of luminescence modulation properties in rare-earth activator-doped ferroelectric oxides.