The Polymer Society of Korea

Abstract

Chiral perovskite-based spin light-emitting diodes (spin-LEDs) have recently attracted significant attention as promising platforms for spintronic optoelectronics. In this study, we demonstrate circularly polarized light emission from a polymeric F8BT layer enabled by a chiral two-dimensional perovskite incorporating newly synthesized halogenated thiophene ligands as a spin-selective transporting layer. Systematic variation of the halogen atom size in the thiophene ligand revealed a pronounced enhancement in chiroptical activity, including circular dichroism (CD), circularly polarized luminescence (CPL), and spin-selective charge transport. Structural analysis showed that larger halogen atoms induce more pronounced asymmetric internetworks within the 2D perovskite lattice, while optical analysis indicated a concurrent increase in the magnetic transition dipole moment. These synergistic effects are responsible for the observed enhancement in spin selectivity. The structure–property relationship elucidated here offers a valuable design principle for future ligand engineering and device-level integration in chiral spintronic systems.