Abstract
Rare-earth ion Eu3+ was doped into SrTiO3 ceramic to improve its dielectric energy storage properties and act as luminescence centres. Typically, SrTiO3 ceramics doped with 0.2% Eu3+ exhibit high breakdown strength up to 354 kV/cm and a relatively high recoverable energy density of 2.13 J/cm3. 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 SrTiO3 ceramic capacitor exhibits an excellent power density of 37 MW/cm3 in an ultrafast discharge time of 25 nanoseconds at 200 kV/cm. Meanwhile, the Eu3+ doped sample exhibits characteristic red photoluminescence. The bifunctional ceramics offer an excellent prospect for energy storage and optical applications.
NSTL
Elsevier