Development of a Cholesteric Liquid Crystal Comprising a Mesogenic Fluorophore for Circularly Polarized Luminescence With a High Dissymmetry Factor

Abstract

Circularly polarized luminescence (CPL) has attracted considerable attention owing to its wide range of potential applications. Cholesteric liquid crystals (CLCs) are promising candidates for CPL-active materials because of their ease of fabrication, stimulus responsiveness, and ability to achieve high dissymmetry factors (|g_lum|). In most studies on CPL-active CLCs, non-mesogenic luminophores are doped into commercially available liquid crystals (LCs). However, their low solubility in LCs (typically only a few wt%) and their tendency to disrupt LC alignment present challenges in achieving high |g_lum| values—particularly in thin cells—and in broadening the CPL spectra. Here, we report a new LC mixture comprising our previously designed mesogenic fluorophore and a commercially available LC. This strategy enables a markedly increased luminophore loading (up to ∼50 wt%) and enhances the birefringence of the LC matrix. As a result, we achieved a notably high |g_lum| value of 1.25 even in thin cells (2 µm), together with significantly broadened CPL spectra. Furthermore, the emission wavelength was successfully tuned via Förster resonance energy transfer. This work demonstrates a rational design strategy for LC mixtures that yield CPL materials with high |g_lum|, advances the fundamental understanding of CPL generation in photoluminescent CLCs, and highlights their potential for future photonic and optoelectronic applications.

Keywords

circularly polarized luminescence / energy transfer / fluorescence / liquid crystals / self-assembly

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