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, Год журнала: 2023, Номер 35(49)

Опубликована: Июль 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

Язык: Английский

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Stimuli-responsive synthetic helical polymers

Chemical Society Reviews, Год журнала: 2023, Номер 53(2), С. 793 - 852

Опубликована: Дек. 18, 2023

Synthetic dynamic helical polymers (supramolecular and covalent) foldamers share the helix as a structural motif.

Язык: Английский

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Precise Modulation of Circularly Polarized Luminescence via Polymer Chiral Co‐assembly and Contactless Dynamic Chiral Communication

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(17)

Опубликована: Март 8, 2024

Circularly polarized luminescence (CPL) plays a pivotal role in cutting-edge display and information technologies. Currently achieving precise color control dynamic signal regulation CPL still remains challenging due to the elusory relationship between fluorescence chirality. Inspired by natural mechanisms governing formation chiral interaction, we proposed an addition-subtraction principle theory address this issue. Three fluorene-based polymers synthesized Suzuki polycondensation with different electron-deficient monomers exhibit similar structures UV/Vis absorption, but distinct emissions intramolecular charge transfer. Based on this, precise-color CPL-active films are obtained through quantitative supramolecular co-assembly directed addition principle. Particularly, ideal white-emitting film (CIE coordinates: (0.33, 0.33)) is facilely fabricated high quantum yield of 80.8 % dissymmetry factor (g

Язык: Английский

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Helical-caging enables single-emitted large asymmetric full-color circularly polarized luminescence

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Янв. 4, 2024

Abstract Colorful circularly polarized luminescence materials are desired for 3D displays, information security and asymmetric synthesis, in which single-emitted ideal owing to self-absorption avoidance, evenly entire-visible-spectrum-covered photon emission facile device fabrication. However, restricted by the synthesis of chiral broad-luminescent emitters, realization application high-performing full-color is its infancy. Here, we disclose a system (spiral generator), composed whole-vis-spectrum emissive quantum dots liquid crystals. The achieves maximum dissymmetry factor 0.8 remains an order 10 −1 visible region tuning photonic bandgap. We then expand it series customized-color luminescence, build devices further demonstrate working scenario photoinduced enantioselective polymerization. This work contributes design efficient chiroptical materials, fabrication synthesis.

Язык: Английский

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Brightening up Full-Color and White Circularly Polarized Luminescence through Chiral Induction and Circularly Polarized Light Excitation

ACS Applied Materials & Interfaces, Год журнала: 2023, Номер 15(10), С. 13668 - 13677

Опубликована: Март 1, 2023

Preparation of chiral materials from achiral helical polymers has aroused great interest among researchers. In this work, small molecules were utilized to accomplish induction toward racemic polyacetylene via intermolecular π-π stacking by which films with strong optical activity fabricated. Furthermore, introducing fluorescent components generated full-color and white circularly polarized luminescence (CPL). A CPL generation mechanism is proposed accordingly, namely light excitation (CP-Ex). emission amplification the dissymmetry factor achieved under synergetic effect CP-Ex chirality transfer. The was further verified double-layered film consisting a layer layer. More noticeably, for films, sense signals can be switched changing direction light. This work opens up new strategies exploring tunable multiple- white-color materials.

Язык: Английский

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Regulation and application of supramolecular gel with circularly polarized luminescence

Science China Chemistry, Год журнала: 2024, Номер 67(6), С. 1865 - 1880

Опубликована: Апрель 12, 2024

Язык: Английский

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Frontiers in Chiral Nonspherical Nanocomposites

ACS Applied Polymer Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 27, 2025

Язык: Английский

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Preparation of chiral polymers: precise chirality transfer from natural species to achiral artificial polymers

Giant, Год журнала: 2023, Номер 14, С. 100161 - 100161

Опубликована: Апрель 27, 2023

The synthesis of chiral substances, especially polymers is currently one the hottest issues in field materials and chemistry due to their unique structural characteristics potential applications. However, acquisition by chemical or asymmetric catalysis may often involve expensive reagents tedious routes. types substances nature are undoubtedly limited. Except for design compounds, utilizing external stimulus factors induce chirality achiral a promising approach. Inspired nature, researchers tend rational interaction systems that attempt precisely transfer information from natural species artificial polymers, which has been proven be an excellent method construct macro-molecular/supramolecular polymer systems. In this review, account typical development naturally occurring including dopants, solvents, summarized. Finally, we further briefly introduce future scope, opportunities, challenges developing novel functional polymeric materials.

Язык: Английский

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

Advanced Optical Materials, Год журнала: 2024, Номер 12(19)

Опубликована: Апрель 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.

Язык: Английский

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Lifetime-tunable circularly polarized luminescent system based on triplet-to-singlet Förster resonance energy transfer

Science China Chemistry, Год журнала: 2024, Номер 67(9), С. 2918 - 2922

Опубликована: Июль 8, 2024

Язык: Английский

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