Planar Chiral Paracyclophanes: Emerging Scaffolds for Circularly Polarized OLEDs

Abstract

Circularly polarized organic light-emitting diodes (CP-OLED) have emerged as key candidates for next-generation display and security technologies; however, simultaneously achieving high device efficiency and pronounced chiroptical activity continues to pose a significant challenge. Paracyclophane (PCP), which exhibits a unique planar chiral structure, has been explored as an important scaffold for constructing efficient circularly polarized luminescent (CPL) active materials. This review summarizes recent developments in PCP-based CPL emitters and thorough comparison with other chirality inducing analogues. Furthermore, highlighting strategies for incorporating PCP into emissive cores to induce and enhance circular polarization. Key molecular design approaches, including donor–acceptor systems, MR-TADF frameworks, and chiral perturbation methods, are discussed in relation to their impact on photophysical properties, dissymmetry factors, and device performance.