Er3+-doped Na0.5Bi0.5TiO3 Ferroelectric Thin Films with Enhanced Electrical Properties and Strong Green Up-conversion Luminescence

TL;DR

This paper reports on Er3+-doped Na0.5Bi0.5TiO3 ferroelectric thin films exhibiting enhanced electrical properties and strong green up-conversion luminescence, prepared via a modified chemical solution deposition method.

Contribution

It introduces a novel fabrication of Er3+-doped Na0.5Bi0.5TiO3 thin films with improved ferroelectric and luminescent properties, demonstrating potential for optoelectronic applications.

Findings

Highest dielectric constant of 1166 in Na0.5Bi0.49Er0.01TiO3 films

Strong green UCL observed at 525 nm and 548 nm

Remnant polarization of 0.22 C/m2 in optimized films

Abstract

Ferroelectric materials with up-conversion luminescence (UCL) properties have potential opto-electric 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 (Pr) and highest dielectric constant are obtained from Na0.5Bi0.49Er0.01TiO3 thin films, and their values are 0.22 C/m2 and 1166, respectively. Meanwhile, strong green UCL at 525 nm and 548 nm are observed in Er3+-doped thin films. They are attributed to 2H11/2 to 4I15/2 and 4S3/2 to 4I15/2 transitions of Er3+ ions. These thin films have potentials in optoelectrical device applications.