Electric field, temperature and light-triggered triple dynamic circularly polarized luminescence switching in fluorescent cholesteric liquid crystals with a large dissymmetry factor

Abstract

Triple stimuli-responsive circularly polarized luminescent materials with large glum values and high fluorescence quantum yields were successfully prepared.

Ionic liquid crystals based on amino acids and gemini surfactants: tunable phase structure, circularly polarized luminescence and emission color

“…Delightedly, the introduction of luminescent molecules into cholesteric liquid crystals (LCs) to manufacture CPL LCs endows the doped materials to possess a high g lum value due to the excellent chirality amplification stemming from their self-organized helical superstructure. 7–13 Consequently, CPL LC materials have broad application prospects in chiroptical devices, optical communication, and 3D displays. 14 Nevertheless, the strong intermolecular interaction between the host and guest is a precondition for their successful preparation, otherwise the doped cholesteric systems will suffer from incompatibility and instability.…”

Tuning the circularly polarized luminescence of polymer-stabilized cholesteric liquid crystal films using chiral dopants

“…28 CLCs can be achieved by adding a chiral dopant to the nematic LCs or directly forming the chiral nematic phase with chiral molecules. [29][30][31][32][33] Specifically, as one kind of quasi-one-dimensional (quasi-1D) photonic crystal, the wavelength and intensity of selective Bragg reflection in CLCs can be tuned as the helical pitch (p) varies according to the l = np formula (l: the center wavelength of reflection band; n: the average refractive index of the CLC). The combination of guest luminescent dyes with CLCs brings great opportunities for efficient CPL emission and large g lum values.…”

A chiral column core surrounded by peripheral emitting moieties: a novel strategy for constructing columnar liquid crystals with circularly polarized luminescence

“…[24][25][26][27][28][29][30][31][32][33][34][35] Another way is through the addition of chiral luminescent additives into achiral nematic liquid crystals, in which the chirality of dopants was transferred and amplified by the orderly molecular assembly of liquid crystals (as shown in Scheme 1b). [36][37][38][39][40][41][42][43][44] Although significant progress for AIE liquid crystals with CPL properties has been made based on these two strategies, more strategies and liquid crystalline self-assembly models for AIE-based CPL liquid crystals are still extremely anticipated in comparison with a rich variety of other liquid crystal materials. For example, almost all the literature studies suggested that the peripheral chiral chains induced achiral AIE cores to produce CPL properties.…”