A novel lead-free luminescent ferroelectric (FE) ceramic, Bi 0.5Na 0.5TiO 3-0.06 BaTiO 3-0.055 Sr 0.7Bi 0.18Er 0.02 0.1 TiO 3 (BNT-BT-SBET), is developed with an adiabatic temperature change (ΔT) 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 K -1 at 522 K. Interestingly, the electrocaloric response reaches a saturation at permittivity shoulder T of 100°C; meanwhile, the maximized emission intensity of 2H 11/2→ 4I 15/2 occurs. T- and E-tunable enhancement of 2H 11/2→ 4I 15/2 emission intensity is due to the population inversion from the 4S 3/2 to 2H 11/2 states caused by an incoherent regime consisting of FE phase and polar nanoregions in a relaxor matrix.
|Number of pages||4|
|Early online date||14 Apr 2020|
|Publication status||Published - 15 Apr 2020|