Phase control of quasi-2D halide perovskite by post-treatment and antisolvent treatment techniques

The fabrication of efficient and stable deep blue halide perovskite light-emitting diodes has attracted significant interest nowadays due to their potential applications in next-generation display technologies. Quasi-2D halide perovskite seems to be perfect material for this application, owing to their unique optoelectronic properties and tunability. However,
during the deposition from stoichiometrically clear phase solution mixture of phases is forming in the thin film leading to redshift of luminescence peak. This shift occurs due to energy
transfer between different phases, affecting the performance and stability of the light-emitting diode. In this study, we explore various approaches for phase control in multiple quantum well structures to achieve stable and efficient emission in the blue region. Additionally, we conduct a comparative analysis of two distinct quasi-2D ligands used in the synthesis of these materials, evaluating their influence on the optical and electronic properties. We study possible ways for synthesis of pure phase quasi-2D perovskite thin films for their implementation in light-emitting diodes.