Strong‐Induced CPL Emission Promoted from Achiral Conjugated Polymer‐Containing Emissive Nematic Liquid Crystals (P‐N*‐LCs)

Abstract

With the rapid development on 3D printing technology, more and more works have been devoted to 3D display. 3D display will really come true by using circularly polarized luminescence (CPL)‐active materials with both high quantum yield and dissymmetry factor (gem) in organic light‐emitting diode or liquid crystals (LCs). But so far most of these CPL materials cannot meet the real application requirement because of the low gem values in the range of 10−5–10−2. In this paper, ternary chiral emissive LCs (P‐N*‐LCs) is designed by doping chiral binaphthyl‐based enantiomers as chiral dopant (Guest 1) and achiral conjugated polymer as induced CPL emitter (Guest 2) into nematic liquid crystal (N‐LCs) Host 5CB. Both Guest 1 and Guest 2 show excellent compatibility with Host 5CB. The obtained ternary P‐N*‐LCs can emit strong‐induced CPL signal with gem up to 1.12 and ФFL up to 66.1%. This work first develops a new strategy for the smart design of excellent CPL materials from versatile achiral conjugation fluorescence polymers.

Signal transmission encryption based on dye-doped chiral liquid crystals via tunable and efficient circularly polarized luminescence

“…By designing the types and proportions of chiral molecules, luminophores, and main liquid crystals of N*LC, the |g lum | of obtained CPL can reach the order from 10 -1 to 1. 11,[17][18][19][20][21][22][23][24][25] Moreover, it is a flexible design that the units in N*LC can be either doped independently or connected by the covalent bond. In addition, substantial effort has been devoted to introducing functional groups in N*LC units so that using multiple physical stimuli, like electric field [26][27][28][29][30] , light 29 and thermal 20,31 to tune CPL activity, can be realized.…”

Induction of a helical superstructure in photoresponsive liquid crystals: switching from linearly polarized to circularly polarized luminescence

“…In comparison with other materials such as organic small molecules, synthetic polymers, and natural macromolecules, CLCs are able to realize the amplification of the circular polarization degree with ease leading to a larger luminescence dissymmetry factor (g lum ). [18][19][20] More intriguingly, CLCs are known to be stimuli-responsive photonic materials, and their molecular alignment and pitch are particularly susceptible to external stimuli including light, temperature, humidity, PH, electric field, etc. [21][22][23][24][25] Among them, optically controllable CLCs exhibit more fascinating performances due to the remote, fast, and easy-to-operate features.…”

The preparation and properties of circularly polarized luminescent liquid crystal physical gels with self-supporting performance

“…27 At present, the reported CPL liquid crystal materials mainly include host-guest doped CPL liquid crystal materials and nondoped CPL liquid crystal materials. [28][29][30] Compared with the non-doped CPL liquid crystal materials, the host-guest doped CPL liquid crystal materials show the advantages of simple preparation and easy regulation of properties. In recent years, great progress has been made in the preparation methods and performance control of host-guest doped circularly polarized luminescent liquid crystal materials.…”