Circularly Polarized Light Responsive Materials: Design Strategies and Applications

Abstract

Circularly polarized light (CPL) with the end of optical vector traveling along circumferential trajectory, shows left‐ and right‐handedness, which transmits chiral information to materials via complicated CPL‐matter interactions. Materials with circular dichroism respond to CPL illumination selectively with differential outputs that can be used to design novel photodetectors. Racemic or achiral compounds under CPL go through photodestruction, photoresolution and asymmetric synthesis pathways to generate enantiomeric bias and optical activity. By this strategy, helical polymers and chiral inorganic plasmonic nanostructures are synthesized directly, and their intramolecular folding and subsequent self‐assembly are photo‐modulable as well. In the aggregated state of self‐assembly and liquid crystal phase, helical sense of the dynamic molecular packing is sensitive to enantiomeric bias brought by CPL, enabling the chiral amplification to supramolecular scale. In this review, we aim to systematically summarize and discuss the application‐guided design strategies of CPL‐responsive materials. Asymmetric synthesis, resolution and property‐modulation of small organic compounds, polymers, inorganic nanoparticles, supramolecular assemblies and liquid crystals are highlighted based on the important developments during the last decades. Besides, applications of light‐matter interactions including CPL detection and biomedical applications are also referred.This article is protected by copyright. All rights reserved

Chiral Conjugated Molecular Assemblies Interact with Substances and Light

“…This further promotes these detectors show promising g SC / g ph with desired photodetection performance (Supporting Information Table 1). − ,,− As there have been several excellent reviews detailing the CPL detection recently, , in this section, we emphasize the relations between supramolecular chirality of active materials and the discrimination ability of CPL detectors.…”

A supramolecular assembly-based strategy towards the generation and amplification of photon up-conversion and circularly polarized luminescence

“…CPL materials find varied applications in different domains namely chiral opto-electronics, biological fields like chemo-sensors, light emitting transistors, CPL switches, 3D-displays, etc . 99–109 CPL has also been applied to amplify the chirality in molecular/supramolecular systems. 110–115 One of the criteria used to describe CPL-active systems is the luminescence dissymmetry factor ( g lum ) which may lie between +2 and −2, positive indicating left-handed circularly polarised light and negative indicating right-handed circularly polarised light. g lum = 2( I L − I R )/( I L + I R )…”

Double-Model Decay Strategy Integrating Persistent Photogenic Radicaloids with Dynamic Circularly Polarized Doublet Radiance and Triplet Afterglow

“…Circularly polarized persistent luminescence (CPPL) refers to the selective polarization emission nature in luminophores. The right- or left-handedness of circularly polarized light is observed for specifically extended emission after the shutdown of external excitation light in the chiral phosphor isomers (Figure a). − This long-lived emission extension is associated with the spin-forbidden transition of intersystem crossing (ISC) and limited energy delivery, leading to insufficient phosphorescence in pure organic phosphors because of small spin–orbit coupling parameters and unstable triplet excited states at ambient conditions. − Nevertheless, organic room-temperature CPPL (RT-CPPL) has still attracted growing dedication in recent years due to its lower fabrication price, versatile excited state, and chiral accessibility, which bring out enthusiastic application developments in optical information anticounterfeiting, sensing, bioimaging, 3D displaying, and spintronics. − In terms of this topic, one of the most important missions is how to improve the diversity of optical information, such as color, lifetime, and even the photon polarization state. That above-described diversity can boost encrypted data complexity and storage capacity. − …”