Reconfigurable amplified circularly polarized photo/electro-luminescence from simple solution self-assembly of a chiral deep-blue fluorene-based conjugated polymer

Abstract

The introduction of chiral groups into organic π-conjugated light-emitting polymers has emerged as a promising approach for developing circularly polarized luminescence (CPL) materials in photonic applications. However, enhancing CPL activity via polymer self-assembly remains largely unexplored. Herein, we present a chiral-functionalized deep-blue polyfluorene (PChDPF) that achieves unprecedented CPL amplification through controlled molecular self-assembly. The self-assembled architecture demonstrates remarkable chiroptical enhancement, exhibiting a dissymmetry factor (g_lum) of −0.21 alongside exceptional durability and stretchability, significantly surpassing conventional polymeric CPL materials, without complex enantioseparation. Intriguingly, the chiroptical activity exhibits dynamic reversibility: ethanol-induced disassembly completely quenches CPL emission, while subsequent toluene vapor exposure facilitates nanostructural reconfiguration, restoring the original g_lum value through precise molecular rearrangement. When implemented in optoelectronic devices, the self-assembled films enable deep-blue electroluminescence with CIE coordinates of (0.16, 0.09), achieving electrically driven CPL with g_lum of −0.028, alongside enhanced device performance and reduced efficiency roll-off. This study establishes a paradigm for manipulating chiroptical properties through supramolecular engineering, providing critical insights into structure–property relationships while facilitating the advancement of deep-blue materials with amplified CPL.