Preparation of chiral luminescent liquid crystals and manipulation effect of phase structures on the circularly polarized luminescence property

Abstract

A high efficiency circularly polarized chiral luminescent liquid crystal with tunable signal was constructed.

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

“…15–17 At present, incorporating aggregation-induced emission luminogens with chiral segments in CPL LCs via covalent bonds results in a series of non-doped CPL LCs with high solid-state efficiency and LC ordering. 18–22 This type of non-doped material effectively avoids the incompatibility and instability of the traditionally doped CPL LCs, benefiting from the lack of additional cholesteric LC medium. Also, it has more abundant phase structures, which is conducive to deeply understand the effect of phase structures on the CPL properties.…”

K+, Sr2+-Triggered Phase Transitions from Chiral Thermotropic Liquid Crystalline to G-Quadruplex CTLC with Circularly Polarized Luminescence

“…To suppress the strong thermo-activated nonradiative decay, these samples were quenched with liquid nitrogen after thermally annealing for 24 h at 80 °C to acquire the vitrified LC films finally. 17 At ambient temperature, the birefringent textures and blue fluorescence (Figure 3a) still exist stably, indicating that phase structures are successfully frozen and thermo-activated nonradiative dissipation is effectively suppressed. The significant CPL signals were detected in these vitrified LC films.…”

“…The 12-, 14-, and 16-GMP complexes were sandwiched between two pieces of quartz plates and cooled to the mesophases from Iso at a rate of 2 °C·min –1 . To suppress the strong thermo-activated nonradiative decay, these samples were quenched with liquid nitrogen after thermally annealing for 24 h at 80 °C to acquire the vitrified LC films finally . At ambient temperature, the birefringent textures and blue fluorescence (Figure a) still exist stably, indicating that phase structures are successfully frozen and thermo-activated nonradiative dissipation is effectively suppressed.…”

“…19−21 The helical organizations impart effective chirality amplification to nondoped chiral LC materials, thereby inducing the high CPL performance with large g lum values. 17,22 Nevertheless, the tedious synthetic process hinders seriously the exploitation of nondoped CPL LCs.…”

“…Nondoped CPL LCs, incorporating aggregation-induced emission (AIE) luminogens into chiral cholesterol through covalent bonds, a series of elaborated mesogens have been designed and synthesized. During cooling from isotropic temperature ( T i ) to the room temperature, they exhibit bright CPL and large QY via LC self-organization. − Point-chiral platinum­(II) complexes, side-chain chiral polymers or polyacetylene derivatives bearing 4-nonyloxy phenyl groups display thermotropic behavior and emit strong circularly polarized light in LCs. − The helical organizations impart effective chirality amplification to nondoped chiral LC materials, thereby inducing the high CPL performance with large g lum values. , Nevertheless, the tedious synthetic process hinders seriously the exploitation of nondoped CPL LCs.…”