A Photo‐ and Thermo‐Driven Azoarene‐Based Circularly Polarized Luminescence Molecular Switch in a Liquid Crystal Host

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(48)

Published: Aug. 31, 2023

The development of chiral optical active materials with switchable circularly polarized luminescence (CPL) signals remains a challenge. Here an azoarene-based molecular switch, (S, R, S)-switch 1 and (R, R)-switch 2, are designed prepared (R)-binaphthyl azo group as photosensitive moiety two (S)- or fluorescent molecules opposite the same handedness moieties. Both switches exhibit reversible trans/cis isomerization when irradiated by 365 nm UV light 520 green in solvent liquid crystal (LC) media. In contrast control switch is doped into nematic LCs, polarization inversion switching-off CPL achieved resultant helical superstructure upon irradiation light, respectively. Meanwhile, fluorescence intensity system basically unchanged during this switching process. particular, these variations could be recovered after heating, realizing true sense switching. Taking advantage unique switching, proof-of-concept for "a dual-optical information encryption system" based on above material demonstrated.

Language: Английский

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Circularly Polarized Organic Ultralong Room‐Temperature Phosphorescence with A High Dissymmetry Factor in Chiral Helical Superstructures

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(7)

Published: Aug. 26, 2023

Abstract Long‐lived room‐temperature phosphorescence (RTP) of organic materials holds a significant potential for optical information. Circularly polarized ultralong (CP‐OURTP) with extremely high dissymmetry factor ( g lum ) values is even highly demanded and considerably challenging. Here, an effective strategy introduced to realize CP‐OURTP emission decay time 735 ms value up 1.49, which exceeds two orders magnitude larger than previous records, through system composed RTP polymers chiral helical superstructures. The exhibits excellent stability under multiple cycles photoirradiation thermal treatment, further employed information encryption based on multiplexing. results are anticipated lay the foundation development in advanced photonic applications.

Language: Английский

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When quantum dots meet blue phase liquid crystal elastomers: visualized full-color and mechanically-switchable circularly polarized luminescence

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

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Dynamically Modulating the Dissymmetry Factor of Circularly Polarized Organic Ultralong Room‐Temperature Phosphorescence from Soft Helical Superstructures

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(12)

Published: Jan. 24, 2024

Abstract Achieving circularly polarized organic ultralong room‐temperature phosphorescence (CP‐OURTP) with a high luminescent dissymmetry factor (g lum ) is crucial for diverse optoelectronic applications. In particular, dynamically controlling the of CP‐OURTP can profoundly advance these applications, but it still unprecedented. This study introduces an effective strategy to achieve photoirradiation‐driven chirality regulation in bilayered structure film, which consists layer soft helical superstructure incorporated light‐driven molecular motor and phosphorescent (RTP) polymer. The prepared film exhibits emission lifetime 805 ms g value up 1.38. Remarkably, resulting be reversibly controlled between 0.6 1.38 over 20 cycles by light irradiation, representing first example CP‐OURTP.

Language: Английский

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Multiple degrees‐of‐freedom programmable soft‐matter‐photonics: Configuration, manipulation, and advanced applications

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

Published: Feb. 1, 2024

Abstract For centuries, humans have never stopped exploring the nature of light and manipulating it, since carries multiple information through its intrinsic wave‐particle dualism, including wavelength, amplitude, phase, polarization, spin/orbital angular momentum, etc., which determines physical language basic manners we perceive objective world. Conventional optical devices, such as lenses, prisms, lasers, are composed solid elements that bulky, making it difficult to manipulate dynamically with degrees‐of‐freedom. Comparatively, some responsive soft matters, especially represented by liquid crystals (LCs), possess distinctive orientational order spontaneous self‐assembled superstructures, enabling digital programming microstructures degrees‐of‐freedom manipulation their characteristics. The based on these is, “soft‐matter‐photonics”, is playing an impressive role in integrated functional present age explosion. Herein, review latest advances, respectively, microstructure configurations, manipulations, relevant prospective applications. Additionally, scientific issues technical challenges hinder programing operation manipulations discussed. Toward a four‐dimensional condensed matter, this may wide implications variety applications, fabrication compact elements, multi‐channel processing high‐capacity communications.

Language: Английский

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Light‐Driven Sign Inversion of Circularly Polarized Luminescence Enabled by Dichroism Modulation in Cholesteric Liquid Crystals

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

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Structural color‐based physical unclonable function

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

Published: Feb. 1, 2024

Abstract Commodity fraud poses significant economic and public health risks while jeopardizing market stability. A promising avenue for addressing this issue involves the incorporation of physical unclonable function (PUF) in anti‐counterfeiting labels commodity authentication purposes. PUFs are a large number unbreakable security generated through random process, which exhibit unique pattern responses that impervious to replication. In particular, novel kind PUF model, called structural color‐based PUFs, combing color characteristics angle‐dependent stability brightness with property, offers unassailable encryption capabilities serves as formidable safeguard against forgery. This review undertakes comprehensive summary recent advancements technology leveraging materials. Moreover, it provides systematic description recognition employed optical PUFs. Finally, prospective outlook is proposed explain existing challenges, highlight potential developments incorporating labels.

Language: Английский

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Adaptive liquid crystal polymers based on dynamic bonds: From fundamentals to functionalities

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

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Smart chiral liquid crystal elastomers: Design, properties and application

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

Published: Feb. 29, 2024

Abstract Smart chiral liquid crystal elastomers are a class of soft photonic crystals with periodic nanostructures. There two kinds structural colors: cholesteric one‐dimensional helical nanostructure and blue‐phase three‐dimensional nanostructure. The self‐assembled can be dynamically controlled under external stimulation, the reflected color adjusted throughout visible light range. Along development innovative material systems cutting‐edge manufacturing technologies, researchers have proposed diverse strategies to design synthesize thoroughly investigated their properties potential applications. Here, we provide systematic review progress in fabrication smart elastomers, focusing on via surface‐enforced alignment, bar coating, 3D printing, anisotropic deswelling methods as well self‐assembly without additional alignment. able respond quickly stimuli wide range applications areas such adaptive optics, color‐changing camouflage, robotics, information encryption. This concludes perspective opportunities challenges for future elastomers.

Language: Английский

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Voxelated opto-physically unclonable functions via irreplicable wrinkles

Light Science & Applications, Journal Year: 2023, Volume and Issue: 12(1)

Published: Oct. 3, 2023

The increased prevalence of the Internet Things (IoT) and integration digital technology into our daily lives have given rise to heightened security risks need for more robust measures. In response these challenges, physical unclonable functions (PUFs) emerged as promising solution, offering a highly secure method generate unpredictable unique random values by leveraging inherent characteristics. However, traditional PUFs implementations often require complex hardware circuitry, which can add cost complexity system. We present novel approach using wrinkles PUF (rw-PUF) based on an optically anisotropic, facile, simple, cost-effective material. These contain randomly oriented liquid crystal molecules, resulting in two-dimensional retardation map corresponding birefringence pattern. Additionally, proposed technique allows customization specific requirements spatial light modulator, enabling fast fabrication. has capability store multiple data sets within single without alterations. Furthermore, we introduce concept called 'polyhedron authentication,' utilizes three-dimensional information storage voxelated PUF. This demonstrates feasibility implementing high-level properties rw-PUF.

Language: Английский

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