Cholesteric Liquid Crystal Polymer Networks Doped with an Axially Chiral Fluorescent Dye: Circularly Polarized Luminescence and Anti‐Counterfeiting Applications

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 17, 2024

Abstract Circularly polarized luminescence (CPL) of chiral luminescent materials has gained increasing attention because their significant applications in 3D displays, optoelectronics, anti‐counterfeiting, and encryption. A strongly emissive dye BAcT is synthesized using ( R )‐BINOL as the source a tetraphenylethene group fluorophore. Upon addition to nematic liquid crystal, left‐handed cholesteric structure induced. Different concentrations / S 5011 co‐dopants are added prepare series structurally colored crystal polymer network (CLCN) films. CPL bands detected for these green CLCN films, relatively high | g lum values (up 0.48) obtained. Furthermore, fluorescent PMMA‐BAcT layer prepared by embedding PMMA matrix stacked with construct composite film. Because filtering effect film, value up 1.41 successfully achieved. Colorful patterns prepared, clear pictures observed both reflective modes, contributing optical anti‐counterfeiting enhanced security. This work not only provides deeper understanding CPL, but also establishes practical strategy colorful inkjet printing technology.

Language: Английский

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Upconversion circularly polarized luminescence of cholesteric liquid crystal polymer networks with NaYF₄:Yb,Tm UCNPs†

Materials Horizons, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Upconversion circularly polarized luminescence (UC-CPL) exhibits promising potential for application anti-counterfeiting and displays. nanoparticles (UCNPs), NaYF

Language: Английский

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Structural relaxation chirality transfer enhanced circularly polarized luminescence in heteronuclear Ce^III–Mn^II complexes

Materials Horizons, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Circularly polarized luminescence (CPL) materials have developed rapidly in recent years due to their wide application prospects fields like 3D displays and anti-counterfeiting. Utilizing energy transfer processes chirality has been proven as an efficient way obtain CPL materials. However, the physics behind energy-transfer induced is still not clear. Herein, a well-designed heteronuclear CeIII-MnII complex system [(Ce((R/S)-L)Br(μ-Br))2]MnBr4 [(R/S)-L = (2R,3R)- or (2S,3S)-2,3-dimethyl-1,4,7,10,13,16-hexaoxacyclooctadecane] with intra from CeIII MnII, dissymmetry factor of MnII obtained by excitation around 10 times higher than that direct while center itself shows almost negligible CPL. To address this unusual phenomenon, we proposed new mechanism named structural relaxation (SRCT) where excited chiral donor amplified acceptor intramolecular interactions. As assistant proof, mixture CeIII-ZnII LaIII-MnII complexes inter showed no amplification. These results will inspire more breakthroughs nature development

Language: Английский

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Circularly polarized luminescence with high dissymmetry factors for achiral organic molecules in solutions

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 26, 2025

Circularly polarized luminescence (CPL) in solution offers several advantages. However, it remains challenging for organic molecules to achieve circularly with high dissymmetry factor (glum) solution. Herein, a general strategy is developed by placing chiral nematic liquid crystals (N*-LCs) behind the of achiral molecules. The selective reflection-transmission mechanism solution-N*-LC composite system enables generation full-color and white light |glum| even reaching 2.0. This demonstrates versatility, being applicable both aqueous solutions, effectively achieving multiple glum values. Additionally, CPL switching logic gate applications are successfully realized leveraging N*-LCs reversible acid-base responsiveness systems. work provides robust values solutions. advantages, however, factors Here, authors report using

Language: Английский

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Hierarchical Chirality Transfer and Amplification within Conjugated Helical Polymers for Efficient Circularly Polarized Organic Light-Emitting Diodes and Photodetectors

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Circularly polarized organic light-emitting diodes (CP-OLEDs) and CP photodetectors have received enormous attention owing to their promising potential in light-related technologies. The simultaneous construction of efficient CP-OLEDs using the multifunctionality same chiral material remains be explored. Herein, achiral conjugated polymer poly(9,9-dioctylfluorene) (PFO) is used for coassembly with helical polyacetylenes. resulting emitters can achieve high-performance circularly electroluminescence (CPEL) a large dissymmetry factor (gEL) 0.11 high brightness 9035 cd m-2. By introducing flexible substrate into device, are realized. Additionally, such serve as photoactive layer photodetector detect light, maximum photocurrent (gph) order 10-1. This work provides route realize factors polyfluorene polymer, facilitating comprehensive versatile development.

Language: Английский

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Controlled Assembly of Chiral One-Dimensional Helical Coordination Polymers for Circularly Polarized Luminescence and Polydimethylsiloxane-Assisted Signal Inversion and Amplification

ACS Materials Letters, Journal Year: 2025, Volume and Issue: unknown, P. 1786 - 1794

Published: April 9, 2025

Language: Английский

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2D/3D Geometric Multiplexing via Orthogonal Control of Circularly Polarized Transmission and Long Afterglow Imaging

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 10, 2025

Abstract Multiplexed optical imaging is highly desirable for enhancing information security. However, shaping optically active materials with circularly polarized long afterglow (CPLA) into 3D geometric structures multiplexing stereoscopic display and multidirectional encryption remains a significant challenge. Herein, novel strategy proposed designing multiplexed patterns using twisted‐stacking hierarchical that exhibit remarkable activity CPLA properties. The hybrid films dynamically orthogonal control of transmission in daylight switchable images darkness, both which can be directly viewed by the naked eye left‐ or right‐handed filters, independently modulated without mutual interference during dynamic regulation process. Furthermore, it demonstrated this integrated platform utilized as multimodal image toward advanced anti‐counterfeiting applications.

Language: Английский

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Polymer induced fluorescence enhancement effect on luminescent chiral nematic cellulose nanocrystal based materials

Carbohydrate Polymers, Journal Year: 2025, Volume and Issue: unknown, P. 123627 - 123627

Published: April 1, 2025

Language: Английский

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Co-Assembly-Driven Chiral Induction of Well-Defined Polyfluorene-block-Poly(phenyl isocyanide) and Its Enhanced Circularly Polarized Luminescence Performance

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Chiral induction of polyfluorene (PF)-containing block copolymers plays a crucial role in the development advanced functional materials; however, research this area remains scarce. In contribution, PFO-b-PPI diblock comprising blocks poly(9,9-dioctylfluorene) (PFO) and poly(phenyl isocyanide) (PPI) were readily synthesized one pot by combining chain-growth Suzuki cross-coupling polymerization modified 9,9-dioctylfluorene monomer with Pd(II)-catalyzed phenyl isocyanide bearing pentafluorophenyl ester substitute. The obtained possessed controlled molar mass (Mn) narrow dispersity (Mw/Mn, Đ). Meanwhile, optically active supramolecular assemblies could be formed via coassembly chiral binaphthyl-based inducer film state after thermal annealing treatment, chirality was influenced temperature weight ratio copolymer to inducer, thickness film. Further investigations revealed that exhibited morphology single-handed helical nanofibers, sense nanofibers depended on configuration inducer. Moreover, excellent circularly polarized luminescence (CPL) performance glum as high 0.11.

Language: Английский

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A universal strategy for multicolor organic circularly polarized afterglow materials with high dissymmetry factors

Proceedings of the National Academy of Sciences, Journal Year: 2025, Volume and Issue: 122(18)

Published: April 29, 2025

Materials with pure organic circularly polarized afterglow (CPA) have attracted significant attention due to their spatiotemporal-resolved optical properties, yet achieving simultaneous high dissymmetry factor (glum) and multicolor ultralong emission remains a challenge. Here, we establish universal energy transfer-photon coupling strategy realize CPA spanning from blue red record-high glum (up 1.90) lifetimes (>6 s). Systematic characterization of nonchiral donor–acceptor systems (TP-BPEA, TP-Fluo, etc.) reveals the absence ground-state chiral centers ( g CD ≈ 0) orientation artifacts LD < 10 −7 ), confirming key role cholesteric liquid crystal polymer in chirality induction. This spatiotemporal synergy between transfer (wavelength modulation) photonic engineering (polarization control) provides framework for materials, potential implications multidimensional information encryption.

Language: Английский

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