Jiangying Wang

Conflict of Interests The authors declare no conflict of interest. Supporting Information As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors.

Abstract A novel lead-free luminescent ferroelectric (FE) ceramic, ${{\rm Bi}_{0.5}}{{\rm Na}_{0.5}}{{\rm TiO}_3} {-} {0.{06\; \rm BaTiO}_3} {-} {0.{055\;\rm Sr}_{0.7}}{{\rm Bi}_{0.18}}{{\rm Er}_{0.02 \,\square\, 0.1}}$${{\rm TiO}_3}$ (BNT-BT-SBET), is developed with an adiabatic temperature change ($\Delta T$) of 0.7 K under an electric field ($E$) of 60 kV/cm at room temperature, an anti-Stokes fluorescence cooling, and a maximum optical $T$ sensitivity of ${0.0055}\;{{\rm K}^{ - 1}}$ at...