Chiral Co-Assembled Liquid Crystal Polymer Network Enabled by In-Situ Photopolymerization for High-Performance CP-OLEDs.

Abstract

Circularly polarized organic light-emitting diodes (CP-OLEDs) show great promise for next-generation display technologies. However, achieving high dissymmetry factors (|gEL|) in circularly polarized electroluminescence (CP-EL) remains a significant challenge. In this study, we construct a novel chiral co-assembled cholesteric liquid crystal polymer network (ChLC-PN) as an emitting layer (EML) to enhance CP-EL performance via a facile in-situ photopolymerization strategy. The ChLC-PN was fabricated by UV-induced polymerization (365 nm, 200 mW/cm², 2 min, N₂ atmosphere) of a chiral co-assembly system comprising liquid crystal monomer (LCM) and chiral inducers (R/S-Cz). Notably, the resulting (R/S-Cz)0.01-(LCP)0.99 based devices demonstrate sky-blue CP-EL with a maximum |gEL| value of 0.012. This work presents the first report of high-performance CP-OLEDs utilizing a chiral co-assembled cholesteric liquid crystal rigid polymer network, offering a promising platform for simple, stable, and scalable fabrication of future CP-OLED devices.