Effects of Er doping site and concentration on piezoelectric, ferroelectric, and optical properties of ferroelectric Na0.5Bi0.5TiO3

Abstract

The piezoelectric, ferroelectric, and optical properties of Er-doped Na0.5Bi0.5TiO3 ceramics were investigated in terms of Er3+ ion occupying the A- and B-site with different Er ion concentrations. Compared with B-site doped samples, the A-site doped ceramics have much stronger piezoelectricity, ferroelectric property, and luminescence intensity. Upon the excitation of 980 nm, all the Er-doped Na0.5Bi0.5TiO3 ceramics exhibit strong green and red emissions. The present investigation demonstrates that the relative intensity of green and red upconversion emissions can be tuned by changing Er ion concentration. In this study, influence of the electrical and luminescence properties of the Er doped ceramics is discussed.