Enhanced Circularly Polarized Luminescence Induced by Efficient Stacking of Axial Chiral Molecules in Liquid Crystal Polymer Films

Abstract

Endowing liquid crystal polymers with chirality and luminescence is a powerful strategy to address the low luminescence asymmetry factor (g_lum) of organic circularly polarized luminescence (CPL) films. However, the mechanism of chiral transfer and amplification in the multicomponent stacking mode of polymers, exogenous chiral molecules, and fluorescent dyes remains a challenge. Here, CPL films with high g_lum values were obtained by controlling the stacking modes of the three components. Employing axial chiral 1,1′-bi-2-naphthol as a dopant allowed for more efficient chiral induction due to its favorable H-aggregation self-assembly and additional π–π interactions with achiral components, resulting in CPL films with a considerable g_lum value of 0.57. This work provides insights into understanding chiral transfer and amplification in multicomponent stacking modes and offers a flexible approach to the design of advanced CPL materials.