Abstract
Ferroelectric materials with up-conversion luminescence (UCL) properties have potential optoelectrical applications for display and sensing, etc. Here, we demonstrate strong green UCL and enhanced electrical properties in Er3+-doped Na0.5Bi0.5TiO3 thin films. The thin films are prepared via using a modified chemical solution deposition method. These thin films are phase-pure and crystallized in perovskite structure. The largest remnant polarization (P r) and highest dielectric constant (ε) are obtained from Na0.5Bi0.49Er0.01TiO3 thin films, and their values are 22 μC/cm2 and 1166, respectively. Meanwhile, strong green UCL at 525 and 548 nm is observed in Er3+-doped thin films. They are attributed to 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions of Er3+ ions. These thin films have potentials in optoelectrical device applications.
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