Bifunctional Europium Doped SrTiO3 Ceramics with Energy Storage and Photoluminescence

Rare-earth ion Eu 3+ was doped into SrTiO 3 ceramic to improve its dielectric energy storage properties and act as luminescence centres. Typically, SrTiO 3 ceramics doped with 0.2% Eu 3+ exhibit high breakdown strength up to 354 kV/cm and a relatively high recoverable energy density of 2.13 J/cm 3 . Compared to those of the undoped sample, the doped ceramic breakdown strength and recoverable energy density are enhanced by about 22% and 58%, respectively. The doping effect can be explained by the inhibition of the long-range movement of carriers. Moreover, the europium doped SrTiO 3 ceramic capacitor exhibits an excellent power density of 37 MW/cm 3 in an ultrafast discharge time of 25 nanoseconds at 200 kV/cm. Meanwhile, the Eu 3+ doped sample exhibits obvious red photoluminescence. The bifunctional ceramics offer an excellent prospect for energy storage and optical applications.