Stretchable Blue Phase Liquid Crystal Lasers with Optical Stability Based on Small‐Strain Nonlinear 3D Asymmetric Deformation

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

Published: Jan. 26, 2025

Abstract Blue phase liquid crystal (BPLC) lasers exhibit exceptional optical quality and tunability to external stimuli, holding significant promise for innovative developments in the field of flexible optoelectronics. However, there remain challenges BPLC elastomer (BPLCE) maintaining good stability during stretching varying temperature conditions. In this work, a stretchable laser is developed based on well‐designed BPLCE with combination partially fully crosslinked networks, which can output single‐peak under small deformation (44.429 nm lasing shift at 32% strain) broad‐temperature range (from −20 100 °C). The superior performance be attributed nonlinear 3D asymmetric exhibited by BPI lattice stretching, particularly low rates below 40% strain, effectively maintains body‐centered cubic structure (with maximum strain up 220%). Moreover, exhibits excellent thermal over from −180 70 °C stopband less than ±10 nm. As proof‐of‐concept, application morphology sensing mechanical perception demonstrated, paves way potential applications

Language: Английский

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Coaxial Direct Ink Writing of Cholesteric Liquid Crystal Elastomers in 3D Architectures

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

Published: Jan. 26, 2025

Cholesteric liquid crystal elastomers (CLCEs) hold great promise for mechanochromic applications in anti-counterfeiting, smart textiles, and soft robotics, thanks to the structural color elasticity. While CLCEs are printed via direct ink writing (DIW) fabricate free-standing films, complex 3D structures not fabricated due opposing rheological properties necessary cholesteric alignment multilayer stacking. Here, CLCE realized by utilizing coaxial DIW print a CLC within silicone ink. By tailoring compositions, thus, properties, phase rapidly forms without an annealing step, while shell provides encapsulation support core, allowing layer-by-layer printing of self-supported structures. As demonstration, bistable thin-shell domes printed. Color changes compressive tensile stresses can be witnessed from top bottom inverted domes, respectively. When arranged array inverted, they snap back their base state uniaxial stretching, thereby functioning as mechanical sensors with memory. The additive manufacturing platform enables rapid fabrication expanding realm potential CLCEs.

Language: Английский

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Solvent‐Free Supramolecular Polymerization for Feather‐Like Nanostructured Chiral Fluorescent Polyurethanes with Multimodal Chiroptical Stimuli Responsiveness

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

Abstract Chiral supramolecular polymers with stimuli‐responsive circularly polarized luminescence (CPL) are highly desirable for smart flexible optoelectronic devices, but remain rarely reported. Here, a simple solvent‐free polymerization preparing chiral polyurethanes is presented by in situ induced self‐assembly strategy, using cellulose nanocrystals (CNCs)‐based isocyanate prepolymers and macromolecular polyols as precursors, achieving precise control over polymer chain assembly spot‐like arrangement. More importantly, further incorporating π‐conjugated luminescent dihydroxynaphthalene molecule, CPL‐active polyurethane films feather‐like nanostructures constructed, which promote the ordered arrangement of CNCs‐based segments due to increased spatial resistance. The π─H bond network between CNCs urethane‐linked benzene rings drives self‐assembly, enabling higher‐level amplification enhanced fluorescence. Interestingly, prepared fluorescent display multimodal chiroptical stimuli responsiveness under various stimuli, such temperature, solvent polarity, pH, light, sensitivity network. This work offers new insights into designing significant potentials.

Language: Английский

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Chiral Co‐assembly Based on a Stimuli‐Responsive Polymer towards Amplified Full‐Color Circularly Polarized Luminescence

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 10, 2024

Abstract Stimuli‐responsive circularly polarized luminescence (CPL) materials have been attaching wide attention in the field of optical information storage and encryption, while still facing challenge realization high dissymmetry factors ( g lum ). This work presents a pair stimuli‐responsive chiral co‐assemblies P7R3 P7S3 by combining polymer PFIQ containing iso ‐quinoline units with inducers. The obtained can reversibly undergo significant modification CPL behavior under trifluoroacetic acid (TFA) fumigation annealing treatment, |g | values exhibiting reversible shift between 0.2 0.3. Moreover, before TFA fumigating effectively induce achiral emitters to generate intense full‐color signals through energy transfer (CPL‐ET), corresponding larger than 0.2. encryption decryption as well multi‐level logic gates application are achieved leveraging activity co‐assembly. provides new perspective for construction luminescent large activation emitters.

Language: Английский

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Reversible Circularly Polarized Luminescence Inversion and Emission Color Switching in Photo-Modulated Supramolecular Polymer for Multi-Modal Information Encryption

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

Constructing circularly polarized luminescence (CPL) materials that exhibit dynamic handedness inversion and emissive color modulation for multimodal information encryption presents both a significant challenge compelling opportunity. Here, we have developed pyridinethiazole acrylonitrile-cholesterol derivative (Z-PTC) exhibits wavelength-dependent photoisomerization photocyclization, enabling in supramolecular assemblies with decent CPL activity. Coordination Ag

Language: Английский

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Asymmetric optical waveguide in one‐dimensional organic microplate

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

Published: Feb. 4, 2025

Abstract Chiral organic materials have garnered significant interest in nanophononics due to their ability manipulate polarized light and encode optical information. Herein, chiral one‐dimensional (1D) microplates based on benzocyclazine form homochiral crystals that exhibit excellent waveguiding properties. These exhibited highly asymmetric propagation depends the handedness of circularly (CPL). demonstrated selective transmission, with R ‐microplate favouring left‐handed CPL S right‐handed CPL, showcasing distinct loss coefficients for each enantiomer. Multichannel was observed, where intensity varied excitation position. results highlight potential 1D advanced nanophotonic devices, offering chiral‐dependent control over transmission future applications information processing.

Language: Английский

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Photoacoustic and upconversion signal variation in In2O3: Er3+/Yb3+ phosphor co-doped with Mg2+/Zn2+ ions under 980 nm excitation for multifunctional applications

Sensors and Actuators A Physical, Journal Year: 2025, Volume and Issue: unknown, P. 116329 - 116329

Published: Feb. 1, 2025

Language: Английский

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Light‐Dynamic Chirality Inversion of Circularly Polarized Organic Ultralong Room‐Temperature Phosphorescence Enabled by Soft Helical Superstructure

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 27, 2025

Abstract Dynamic and reversible manipulation of circularly polarized luminescence (CPL) in soft materials is highly desirable for advanced chiroptical devices, information encryption, labeling technology. However, this remains a formidable challenge organic ultralong room‐temperature phosphorescence (CP‐OURTP) materials. Herein, bilayered chiral‐switchable CP‐OURTP system presented, composed light‐driven hydrazone photoswitch (M1)‐doped helical superstructure layer room temperature (RTP) polymer layer, enabling dynamic chirality inversion manner under alternating stimulation 460 340 nm light irradiation. The obtained film exhibits with maximum absolute dissymmetry factor ( g lum ) value 0.39 long‐lived emission lifetime 823 ms. Notably, the values can be dynamically reversibly modulated between +0.30 and−0.35 irradiation different wavelengths over 50 cycles without fatigue, owing to photoinduced configuration changes M1, making first example regulating

Language: Английский

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From nano to macro: Light‐driven chiral dopants in liquid crystals

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

Published: March 20, 2025

Abstract Harnessing nanoscale molecular structural changes to achieve precise control over macroscopic devices represents an emerging and effective strategy. One promising approach involves the introduction of light‐driven chiral dopants into liquid crystals (LCs), enabling fine‐tuned modulation helical superstructures in cholesteric (CLCs) via photoisomerization. This strategy opens up exciting possibilities for development innovative photo‐responsive with dynamic functionalities. review focuses on most common used LCs, including azobenzene, diarylethene, α ‐cyanostilbene overcrowded alkene. The chemical design principles these four types switches are highlighted, along their abilities induce pitch inversion CLCs. Finally, applications controlling showcased, particularly display technologies, anti‐counterfeiting, optical 3D droplet manipulation. It is hoped that this provides valuable insights guidances novel advancement soft matter material applications.

Language: Английский

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Mechanochromic 3D Soft Photonic Crystals Enabled Anticounterfeiting and Encryption Information Storage

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

Published: Oct. 9, 2024

Abstract Inspired by the color‐changing abilities of natural organisms, this research focuses on design and fabrication mechanochromic liquid crystal photonic thin films with periodic self‐assembly structures. Benefiting from its unique 3D self‐assembled structure a body‐centered cubic lattice, BP I film exhibits excellent mechanical properties, characterized superior elasticity toughness due to presence rigid flexible microdomains suitable dislocation line volumes. As strain increases, structural color demonstrates repeatable rapid shift red blue, covering entire visible light spectrum high reflectivity. The incorporation fluorescent molecules further enhances properties endowing circularly polarized luminescence under UV irradiation. Utilizing different dyes as inks, arbitrary patterned writing can be performed BPI film, enabling specific information hiding encryption. prepared label environmental stability, presenting promising applications in storage, anti‐counterfeiting, displays. study may contribute deeper understanding relationship between microstructure, deformation, optical potentially advancing development innovative responsive materials multifunctional devices.

Language: Английский

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