Circularly Polarized Luminescence of Cholesteric Liquid Crystal Polymer Networks with a Europium(III) Complex as an Emitter DOI

Li-Ting Xu,

Fengyun Shi,

Jinghua Zhao

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(12), P. 15242 - 15250

Published: March 14, 2024

A coordination complex, Eu(C12C12dbm)3(phen), with strong emission and a high quantum yield (QY ∼ 51.9%) was synthesized. The EuIII as fluorescent emitter, embedded in cholesteric liquid crystal polymer networks (CLCNs). series of free-standing EuIII-CLCN films were obtained, generating typical sharp band corresponding to the complex. Tunable handedness circularly polarized luminescence (CPL) |glum| values (up 0.63) observed. CPL-active CLCN-coated PET also prepared (|glum| up 0.63), which can be used for large-area preparations. Moreover, by stacking an emitter-embedded PMMA layer CLCN layer, composite system built, large value (∼1.42) achieved. Fluorescence patterns prepared, distinct images recognized under both daylight UV light. This work not only demonstrated that compounds could incorporated prepare materials but provided new perspective emissive anticounterfeiting encryption.

Language: Английский

Mechanically Tunable Circularly Polarized Luminescence of Liquid Crystal‐Templated Chiral Perovskite Quantum Dots DOI
Xuan Zhang, Lin Li, Yuanhao Chen

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(22)

Published: March 25, 2024

Abstract Endowing perovskite quantum dots (PQDs) with circularly polarized luminescence (CPL) offers great promise for innovative chiroptical applications, but the existing strategies are inefficient in acquiring stimuli‐responsive flexible chiral films large, tunable dissymmetry factor ( g lum ) and long‐term stability. Here, we report a strategy design synthesis of luminescent cholesteric liquid crystal elastomer (Lumin‐CLCE) mechanically CPL, which is enabled by crystal‐templated self‐assembly situ covalent cross‐linking judiciously designed photopolymerizable CsPbX 3 (X=Cl, Br, I) PQD nanomonomers into elastic polymer networks. The resulting Lumin‐CLCE showcase structural color natural light noticeable CPL maximum value up to 1.5 under UV light. manipulation intensity rotation direction achieved controlling self‐assembled helicoidal nanostructure handedness soft helices. A significant breakthrough lies achievement reversible, perovskite‐based switch activated biaxial stretching, enables flexible, dynamic anti‐counterfeiting labels capable decrypting preset information specific polarization states. This work can provide new insights development advanced materials their emerging applications encryption, 3D displays, beyond.

Language: Английский

Citations

33
When quantum dots meet blue phase liquid crystal elastomers: visualized full-color and mechanically-switchable circularly polarized luminescence DOI Creative Commons
Shan Li, Yuqi Tang,

Qingyan Fan

et al.

Light Science & Applications, Journal Year: 2024, Volume and Issue: 13(1)

Published: June 14, 2024

Abstract Polymer-based circularly polarized luminescence (CPL) materials with the advantage of diversified structure, easy fabrication, high thermal stability, and tunable properties have garnered considerable attention. However, adequate precise tuning over CPL in polymer-based remains challenging due to difficulty regulating chiral structures. Herein, visualized full-color is achieved by doping red, green, blue quantum dots (QDs) into reconfigurable phase liquid crystal elastomers (BPLCEs). In contrast signal observed cholesteric (CLCEs), 3D cubic superstructure BPLCEs induces an opposite signal. Notably, this effect entirely independent photonic bandgaps (PBGs) results a g lum value, even without matching between PBGs emission bands QDs. Meanwhile, lattice structure can be reversibly switched via mechanical stretching force, inducing on-off switching signals, these variations further fixed using dynamic disulfide bonds BPLCEs. Moreover, smart systems for anti-counterfeiting information encryption been demonstrated, suggesting great potential BPLCEs-based active materials.

Language: Английский

Citations

31
Expanding the Horizons of Machine Learning in Nanomaterials to Chiral Nanostructures DOI Creative Commons
Vera Kuznetsova, Áine Coogan,

Dmitry Botov

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(18)

Published: Jan. 19, 2024

Abstract Machine learning holds significant research potential in the field of nanotechnology, enabling nanomaterial structure and property predictions, facilitating materials design discovery, reducing need for time‐consuming labor‐intensive experiments simulations. In contrast to their achiral counterparts, application machine chiral nanomaterials is still its infancy, with a limited number publications date. This despite great advance development new sustainable high values optical activity, circularly polarized luminescence, enantioselectivity, as well analysis structural chirality by electron microscopy. this review, an methods used studying provided, subsequently offering guidance on adapting extending work nanomaterials. An overview within framework synthesis–structure–property–application relationships presented insights how leverage study these highly complex are provided. Some key recent reviewed discussed Finally, review captures achievements, ongoing challenges, prospective outlook very important field.

Language: Английский

Citations

24
Light‐Driven Sign Inversion of Circularly Polarized Luminescence Enabled by Dichroism Modulation in Cholesteric Liquid Crystals DOI
Yang Li, Yihan Chen, Jiaxin Luo

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(16)

Published: Jan. 12, 2024

Stimuli-responsive circularly polarized luminescence (CPL) materials show great promise in applying information encryption and anticounterfeiting. Herein, light-driven CPL sign inversion is achieved by combining a photoresponsive achiral negative dichroic dye (KG) static positive (NR) as dopants at the 0.5:0.5 weight ratio into cholesteric liquid crystal (CLC) host. The side chains of KG undergo trans/cis isomerization after 365 nm UV light irradiation, leading to dichroism (S

Language: Английский

Citations

23
Chiral Liquid Crystalline Metal–Organic Framework Thin Films for Highly Circularly Polarized Luminescence DOI
Xuexian Yang, Na Li, Chong Li

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(23), P. 16213 - 16221

Published: May 30, 2024

Combining metal–organic frameworks (MOFs) with liquid crystals to construct crystalline MOFs (LCMOF) offers the advantage of endowing and enhancing their functionality, yet it remains a challenging task. Herein, we report chiral MOF (CLCMOF) thin films by cross-linking (CLC) realize highly circular polarization luminescence (CPL) performance photo thermal switching. By layer stilbene-containing CLC stilbene-based (CLC/MOF) film, CLCMOF were successfully obtained after UV irradiation due abundant [2 + 2] photocycloaddition. The resulted have strong chirality, obvious photochromic fluorescent, CPL (the asymmetry factor reaches 0.4). Furthermore, fluorescent thermotropic CLC, can be reversed red-shifted heating treatment, showing photo- Such MOF-based photo/thermal switching prepared patterns codes for demonstration potential application in advanced information anticounterfeit encryption. This study not only opens strategy developing combining but also new route achieve optical applications.

Language: Английский

Citations

23
Chameleon-inspired structural coloration of textiles with non-close-packed photonic crystals for high color saturation and color fastness DOI
Xiaohui Wang, Xiaohui Liang, Yichen Li

et al.

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 483, P. 149053 - 149053

Published: Jan. 29, 2024

Language: Английский

Citations

22
Adaptive liquid crystal polymers based on dynamic bonds: From fundamentals to functionalities DOI Creative Commons
Ruochen Lan, Xiang‐Guo Hu, Jingyu Chen

et al.

Deleted Journal, Journal Year: 2024, Volume and Issue: 2(1)

Published: Feb. 1, 2024

Abstract Liquid crystal polymers (LCPs) have gained tremendous attention in recent years due to their great potentials from fabrication of responsive actuators and sensors construction intelligent soft robotic light modulators. However, conventional LCPs with permanent cross‐links present tedious unmodifiable stimuli‐responsiveness. Recently, dynamic bonds capable reversibly break reform been integrated into LCP, imparting intrinsic characteristics. The LCP possesses unprecedented diverse functionalities including reprogrammability, recyclability, self‐healing ability, becoming much more adaptive surrounding environmental changes compared the counterpart. In this review, progress bond‐based is summarized. mechanism, preparation, based on noncovalent bond (DNCB) covalent (DCB) are poised be discussed, followed by introducing emergent combining both DNCB DCB. Consequently, unique will given. Finally, outlooks development presented.

Language: Английский

Citations

19
Assembly‐Induced Dynamic Structural Color in a Host‐Guest System for Time‐Dependent Anticounterfeiting and Double‐Lock Encryption DOI

Yufan Ji,

Tianfu Song, Haifeng Yu

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(26)

Published: April 10, 2024

Manipulation of periodic micro/nanostructures in polymer film is great importance for academics and industrial applications anticounterfeiting. However, with the increasing demand on information security, materials time-dependent features are urgently required, especially material where same can appear more than once time scale. Here, one concise strategy to realize anticounterfeiting "double-lock" encryption based a host-guest system proposed, photoresponsive azopolymer as host liquid-crystalline molecule guest. The exhibits tunable mass transport pre-designed by tailoring process cis-to-trans recovery azo groups assembly mesogenic trans-isomers, resulting dynamic structural color film. Taking advantage this extraordinary feature, has been achieved. More importantly, each state's appearance whole be modulated changing ratio. Combining manipulatable unique decoding method, stored decrypted correctly. This work provides an unprecedented approach advanced technology higher level security high-end encryption.

Language: Английский

Citations

16
Light-Reconfiguring Inhomogeneous Soft Helical Pitch with Fatigue Resistance and Reversibility DOI
Mengqi Li, Honglong Hu, Binghui Liu

et al.

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(45), P. 20773 - 20784

Published: Nov. 7, 2022

Active engineering and modulation of optical spectra in a remote fully reversible light is urgently desired photonics, chemistry, materials. However, the real-time regulation multiple information such as wavelength, bandwidth, reflectance, polarization still longstanding issue due to lack an appropriate photoresponsive candidate. Herein, we propose additional "degree-of-freedom (DOF)" photo-modulated soft helix, build up unprecedented inhomogeneous helical pitch length with light-reconfiguring property, fatigue resistance, reversibility. For working model, intrinsic chiral photoswitch LBC5 employed actuator modulate length, which proportional irradiation intensity, unique broadband absorbance photo-modulator BTA-C5 incorporated attenuator transmitted decrease its intensity along sample thickness, therefore successfully adding another controlled DOF on distribution (i.e., homogeneous or inhomogeneous) apart from common helix only single length. The variable absorption enables reconfigure inhomogeneous, thereby achieving robust fatigue-resistance establishment spectral programming. established light-reconfigurable modulator can provide breakthrough control chirality, especially for dynamically broadening narrowing bandwidth demand, further enable ever-desired NIR circularly polarized luminescence (CPL) high dissymmetry factor glum 1.88. cutting-edge photoswitchable provides access multi-freedom materials, optics, biophotonics, other relevant fields.

Language: Английский

Citations

45
Bioinspired humidity-responsive liquid crystalline materials: from adaptive soft actuators to visualized sensors and detectors DOI
Ruochen Lan, Wenbo Shen, Wenhuan Yao

et al.

Materials Horizons, Journal Year: 2023, Volume and Issue: 10(8), P. 2824 - 2844

Published: Jan. 1, 2023

This review provides a comprehensive summary of humidity-responsive liquid crystalline systems, ranging from the mechanism and preparation systems to application emerging materials.

Language: Английский

Citations

39