Ultrastrong Circularly Polarized Luminescence Triggered by the Synergistic Effect of Chiral Coassembly and Selective Reflective Cholesteric Liquid Crystal Film

Enhancing the dissymmetry factor (g_lum) is crucial for circularly polarized luminescence (CPL) applications. Herein, we present an innovative strategy achieving an ultrastrong |g_lum| of 1.73. This is accomplished through the synergistic effect of coassembly of the CPL-emitting ternary liquid crystal (T-N*-LC, |g_lum| = 0.47) and the selective reflection (λ = 590 nm) of the polymer cholesteric liquid crystal (CLC) within a composite system. Unlike the mismatched chirality combination (|g_lum| = 1.42, ΔFL = 57%), the matched combination demonstrates an ultrastrong CPL signal with a |g_lum| of 1.73 and a low ΔFL of 50% when the CPL direction of the T-N*-LC agrees with the CLC film’s chirality. Furthermore, we alter the matching degree of the composite system by applying a direct-current (DC) electric field to realize the CPL switch. This study paves the way for developing outstanding CPL-active display materials through synergistic amplification of g_lum.