Giant Piezoelectricity and Excellent Thermal Sensitivity in Er Doped PSN‐PMN‐PT via Texturing‐Driven Crystal Field Engineering

To address the challenge of concurrent regulation of piezoelectric and upconversion (UC) luminescent properties in multifunctional ceramics, this study introduces a texturing‐induced crystal field engineering strategy. The [001] c texturing can significantly facilitate polarization rotations, meanwhile reducing the local crystal field symmetry at the B‐sites of the Er 3+ doped perovskites. As a result, a breakthrough in the piezoelectric and UC luminescent performance has been achieved in Er 3+ doped Pb(Sc 1/2 Nb 1/2 )O 3 ‐Pb(Mg 1/3 Nb 2/3 )O 3 ‐PbTiO 3 (PSN‐PMN‐PT) ceramics by constructing the [001] c ‐oriented grains with a high Lotgering factor F 001 ∼ 99.2%. The 0.0175Er:PSN‐PMN‐PT textured ceramic presents ultrahigh piezoelectric constant d 33 ∼ 1120 pC N −1 and great luminescence thermal sensitivity ( S a = 0.0043 K −1 , S r = 0.028 K −1 , δ T = 0.48 K). Leveraging the dynamic correlation between crystal field‐modulated thermally coupled energy levels (TCLs) and in situ piezoelectric‐temperature responses, the textured ceramic demonstrates a dual‐mode self‐calibrated temperature sensing capability, showing its great potential for advanced optoelectronic‐integrated applications. This study provides a new strategy to modulate the crystal field for the design of high‐performance piezoelectric and UC luminescent multifunctional ceramics.