Liquid Crystals Doped with Chiral Fluorescent Polymer: Multi‐Color Circularly Polarized Fluorescence and Room‐Temperature Phosphorescence with High Dissymmetry Factor and Anti‐Counterfeiting Application

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(49)

Published: July 28, 2023

Chiral nematic liquid crystals (N*-LCs) can tremendously amplify circularly polarized luminescence (CPL) signals. Doped emissive N*-LCs have been substantially explored. However, their CPL performances still need to be improved, mainly due the unsatisfying helical twisting power (HTP) of commonly used chiral fluorescent dopants. polymers (CFHPs) outstanding optical activity and performance. The present contribution reports first success in constructing by doping CFHP into (5CB, N-LCs). assembly structures effectively signals CFHP. Owing high HTP CFHP, selective reflection band N*-LC adjusted fully cover its emission band. A nearly pure with a dissymmetry factor (glum ) up -1.87 is realized at 9 wt% concentration. Taking advantage mechanism, multi-color CPL-active glum are fabricated via further adding achiral fluorophores. Also noticeably, room-temperature phosphorescence -1.57 achieved. Anti-counterfeiting application demonstrated exploiting multi-mode characteristics created N*-LCs. established strategy for provides platform future exploring

Language: Английский

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Circularly Polarized Light Responsive Materials: Design Strategies and Applications

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(49)

Published: March 19, 2023

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 circular dichroism respond CPL illumination selectively differential outputs that can be used design novel photodetectors. Racemic or achiral compounds under go through photodestruction, photoresolution, asymmetric synthesis pathways generate enantiomeric bias activity. By this strategy, helical polymers inorganic plasmonic nanostructures are synthesized directly, their intramolecular folding subsequent self‐assembly photomodulable as well. In aggregated state liquid crystal phase, sense dynamic molecular packing is sensitive brought by CPL, enabling amplification supramolecular scale. review, application‐guided strategies CPL‐responsive aimed systematically summarized discussed. Asymmetric synthesis, resolution, property‐modulation small organic compounds, polymers, nanoparticles, assemblies crystals highlighted based on important developments during last decades. Besides, applications light–matter interactions including detection biomedical also referred.

Language: Английский

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Helix-Induced Asymmetric Self-Assembly of π-Conjugated Block Copolymers: From Controlled Syntheses to Distinct Properties

Accounts of Chemical Research, Journal Year: 2023, Volume and Issue: 56(21), P. 2954 - 2967

Published: Oct. 18, 2023

Conspectusπ-Conjugated polymers have gained significant interest because of their potential applications in optoelectronics, bioelectronics, and other domains. The controlled synthesis π-conjugated block optimizes performance enables novel properties functions. However, precise control the self-assembled architectures remains a formidable challenge. Inspired by helical biomacromolecules, supramolecular assemblies attention. Helical with an excess one-handed helicity can be optically active strong tendency toward self-assembly. Incorporating polymer into induce asymmetric assemblies, leading to chiral materials unique functionalities.To self-assembly architectures, are usually synthesized copolymers incorporating self-assembling characteristics. Although various been produced, is still challenging has rarely addressed. self-assembly, which transfers chirality polymer, resulting chiroptical functionalities. synthesizing hybrid containing two distinct blocks complicated. Some general strategies such as connecting chain ends preformed homopolymers extending prefabricated second monomer time-consuming require complex synthetic protocols. Therefore, developing for facile predictable molar mass, low dispersity, tunable composition practical importance.Recently, we investigated polyisocyanides, polyallenes, polycarbenes advanced Pd(II) Ni(II) catalysts. These were successfully incorporated polymers, including polythiophene, polyfluorene, poly(phenyleneethynylene), via one-pot sequential living polymerization monomers using Pd(II)- or Ni(II)-complexes As result, variety well-defined polymeric readily synthesized. copolymerized possess different structures mechanisms, copolymerization followed mechanism provided desired high yields narrow size distribution, composition.Remarkably, induces copolymer supramolecular, architecture optical properties. More interestingly, utilizing crystallization conjugated blocks, crystallization-driven helix-induced yielded family uniform single-handed dimensions, helicity. transfer rendered achiral emission white light over broad spectrum circularly polarized luminescence.

Language: Английский

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“Matching Rule” for Generation, Modulation and Amplification of Circularly Polarized Luminescence

Accounts of Chemical Research, Journal Year: 2024, Volume and Issue: 57(8), P. 1188 - 1201

Published: April 5, 2024

ConspectusCircularly polarized luminescence (CPL) generated by chiral luminescent systems has sparked enormous attention in multidisciplinary field as it brings infinite potential for applications, such 3D optical displays, biological probes, and chiroptical sensors. Satisfying both the conditions of chirality (including fluorescence or phosphorescence) is a prerequisite constructing CPL materials. In this regard, whether organic, inorganic, hybrid systems, components generally involve effective coupling through covalent noncovalent bonds. For interactions, copolymerization monomers, although bonds provide high stability system, they inevitably tedious preparation procedures that connect together. bonds, take supramolecular assembly an example, elements achiral light-emitting units are transferred intermolecular their advantages include diversity building blocks, stimuli responsiveness brought well amplification signals coassembly. However, system may be poor, performance morphology difficult to predict. Gratifyingly, matching rule do not rely on together with interactions allows effortless construction, modulation, systems.In Account, we overview different strategies based rule, including fluorescence-selective absorption, circularly reflection, energy transfer (CPF-ET). Examples these illustrated focus helical polymers light appealing structures wide uses. instance, can convert racemic into one specific handedness simply overlapping polymer's circular dichroism (CD) spectra luminophore's emission spectra. employing selective reflection certain handedness's light, twisting power (HTP) polymer cholesteric liquid crystals (N*-LCs) gives glum. Additionally, CPF-ET, only spectrum donor absorption (or excitation) acceptor required overlap, no between two required. An outlook materials related which will avail optimization extension intriguing approach concludes Account. We hope Account offer insightful inspiration flourishing progress present exciting opportunities.

Language: Английский

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Enabling robust blue circularly polarized organic afterglow through self-confining isolated chiral chromophore

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 9, 2024

Abstract Creating circularly polarized organic afterglow system with elevated triplet energy levels, suppressed non-radiative transitions, and effective chirality, which are three critical prerequisites for achieving blue afterglow, has posed a formidable challenge. Herein, straightforward approach is unveiled to attain materials by covalently self-confining isolated chiral chromophore within polymer matrix. The formation of robust hydrogen bonds the matrix confers distinctly stabilized molecular state chromophores, endowing emission band at 414 nm, lifetime 3.0 s, luminescent dissymmetry factor ~ 10 −2 . Utilizing synergistic chirality transfer, full-color systems endowed doping colorful fluorescent molecules into designed polymers, empowering versatile applications. This work paves way streamlined design materials, expanding horizons various domains.

Language: Английский

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Chiral Nanostructures from Artificial Helical Polymers: Recent Advances in Synthesis, Regulation, and Functions

ACS Nano, Journal Year: 2025, Volume and Issue: 19(1), P. 229 - 280

Published: Jan. 4, 2025

Helical structures such as right-handed double helix for DNA and left-handed α-helix proteins in biological systems are inherently chiral. Importantly, chirality at the nanoscopic level plays a vital role their macroscopic chiral functionalities. In order to mimic functions of natural nanoarchitectures, variety nanostructures obtained from artificial helical polymers prepared, which can be directly observed by atomic force microscopy (AFM), scanning tunneling (STM), electron (SEM), transmission (TEM). This review mainly focuses on formation morphology regulation triggered polymer chain length, concentration, solvent, temperature, photoirradiation, chemical additives. addition, distinct including recognition, circularly polarized luminescence, drug release, cell imaging, antibiosis also discussed.

Language: Английский

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Polymeric Cholesteric Superhelix Induced by Chiral Helical Polymer for Achieving Full‐Color Circularly Polarized Room‐Temperature Phosphorescence with Ultra‐High Dissymmetry Factor

Small, Journal Year: 2024, Volume and Issue: unknown

Published: June 17, 2024

Abstract Circularly polarized room‐temperature phosphorescence (CPRTP) simultaneously featuring multiple colors and extremely high dissymmetry factor ( g lum ) is crucial for increasing the complexity of optical characteristics advancing further development, but such a type CPRTP still unprecedented. The present work develops an effective universal strategy to achieve full‐color with ultra‐high factors in polymeric cholesteric superhelix network, which constructed by liquid crystal polymer chiral helical (CHP). Taking advantage twisting power CHP, resulting network exhibits remarkable activity. Significantly, adopting simple double‐layered architectures consisting film phosphorescent films, blue‐, green‐, yellow‐, red‐CPRTP emissions are successfully obtained, maximum | values up 1.43, 1.39, 1.09 0.84, respectively. Further, multilevel information encryption application demonstrated based on multidimensional architectures. This study offers new insights into fabricating considerable performance advanced photonic applications.

Language: Английский

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Helicity Control of Circularly Polarized Luminescence from Aromatic Conjugated Copolymers and Their Mixture Using Reversibly Photoinvertible Chiral Liquid Crystals

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(3), P. 3991 - 4002

Published: Jan. 6, 2024

We synthesized cyclic chiral compounds [(R)/(S)-D2s] by linking a photoresponsive bisbenzothienylethene (BTE) moiety with an axially binaphthyl moiety. Chiral nematic liquid crystals (N*-LCs) were prepared adding as dopants to host N-LCs. These N*-LCs exhibited reversible chirality inversion upon photoisomerization between the open and closed forms of BTE Here, mechanism underlying in was investigated comparing helical twisting powers (HTPs) (R)-D2s those analogous compounds. It found that containing is governed delicate balance two types opposite helicity, i.e., right-handed helicity inherently left-handed bearing intramolecularly induced chirality. Namely, moiety, which attributed intramolecular transfer from Thus, are double consisting intrinsically Photocontrol senses photoinversion achieved utilizing UV visible light irradiation steric effects substituents at rings (R)-D2s. In addition, photocontrol circularly polarized luminescence (CPL) using photoinvertible N*-LC. The achiral aromatic conjugated copolymers red, green, blue fluorescence dissolved mixed present N*-LC, they left- white CPL large dissymmetry factors (|glum|) ranging 0.2 1.0. CPLs reversibly photoswitched due PSS through irradiation.

Language: Английский

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Synergistically Boosting the Circularly Polarized Luminescence of Functionalized Pillar[5]arenes by Polymerization and Aggregation

Advanced Science, Journal Year: 2023, Volume and Issue: 10(35)

Published: Oct. 22, 2023

Abstract Supramolecular polymers based on chiral macrocycles have attracted increasing attention in the field of circularly polarized luminescence (CPL) owing to their unique properties. However, construction macrocyclic supramolecular with highly efficient CPL properties aggregate states still remains challenging. Herein, w e constructed a class macrocycle‐based coordination by combining planar pillar[5]arene excellent fluorescence aggregation‐induced emission luminogens. The formation enhances both and properties, resulting remarkable Increasing aggregation degree can further improve as evidenced 21‐fold increase dissymmetry factor an over 25‐fold quantum yield state compared solution state. Such synergistic effect polymerization‐ aggregation‐enhanced be explained restriction intramolecular motions conformation confinement. This work provides promising method for developing polymers.

Language: Английский

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Reversible Photochromism for Dynamically Tuning Full‐Color Circularly Polarized Luminescence Toward Multi‐Level Anti‐Counterfeiting Application

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(19)

Published: April 9, 2024

Abstract Photochromic circularly polarized luminescence (CPL) demonstrates broad application prospects in the field of advanced functional materials. However, current photochromic CPL focuses predominantly on single‐band adjustment, and how to achieve dynamically tunable multi‐band is still highly challenging. This work reports success utilizing reversible photochromism for realizing full‐color emission. flexible films are created consisting triple components: spiropyran (SP) working as matter, polyurethane (PU) matrix, chiral helical polyacetylene component. Further introducing blue fluorophore 9‐anthracene carboxylic acid (ACA) film, red emitted respectively through selective absorption/transmission fluorescence energy transfer (CPF‐ET). Doping film with diverse fluorophores provides Adding Zn 2+ further intensifies via forming merocyanine (MC)‐Zn complex. Taking advantage emission, anti‐counterfeiting, secondary encryption resulting materials demonstrated.

Language: Английский

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