Stimulus-responsive polymer materials toward multi-mode and multi-level information anti-counterfeiting: recent advances and future challenges

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 53(2), P. 606 - 623

Published: Dec. 15, 2023

This review highlights the recent advances and discusses challenges perspectives of stimulus-responsive polymer (SRP)-based information-storage materials, which exhibit multi-mode or multi-level anti-counterfeiting performance.

Language: Английский

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Liquid Crystal Assembly for Ultra-dissymmetric Circularly Polarized Luminescence and Beyond

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(24), P. 12951 - 12966

Published: June 5, 2023

Circularly polarized luminescence (CPL) is attracting much interest because it can carry extensive optical information. CPL shows left- or right-handedness and be regarded as part of high-level visual perception to supply an extra dimension information with regard regular light. A key meeting the needs for practical applications develop emerging field ultra-dissymmetric CPL. Chiral liquid crystal (LC) assemblies─otherwise referred cholesteric crystals (CLCs)─are essentially organized helical superstructures a highly ordered one-dimensional orientation, distinctly superior supramolecules. CLCs achieve perfect equilibrium molecular short-range interaction long-range orientational order, enabling molecule-scale chirality on pitch observable scale. LC assembly could ideal strategy amplifying chirality, making accessible Herein, we focused some basic but important issues regarding CPL: (i) How created from chiral dyes? (ii) Is luminescent dyes essential factor generation CPL? That is, all emit vice versa? (iii) transferred within intermolecular systems, what principles transmission should followed? Given these queries our work, in this Perspective discuss generation, transmission, modulation assembly, aiming design build up novel chiroptical materials. Recent CPL-active microstructures three-dimensional displays, circularly lasers, asymmetric catalysis are also discussed.

Language: Английский

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Multiple Stimuli‐Responsive Luminescent Chiral Hybrid Antimony Chlorides for Anti‐Counterfeiting and Encryption Applications

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(36)

Published: July 18, 2023

Stimuli-responsive circularly polarized luminescence (CPL) materials are ideal for information anti-countering applications, but the best-performing have not yet been identified. This work presents enantiomorphic hybrid antimony halides R-(C5 H12 NO)2 SbCl5 (1) and S-(C5 (2) showing mirror-imaged CPL activity with a dissymmetry factor of 1.2×10-3 . Interestingly, DMF-induced structural transformation is realized to obtain non-emissive ⋅ DMF (3) (4) upon exposure vapor. The process reversed heating. DFT calculations showed that DMF-induced-quenched-luminescence attributed intersection ground excited state curves on configuration coordinates. Unexpectedly, nanocrystals chiral 1 2 were prepared indicate excellent solution performance. reversible PL switching gives system applications in technology, anti-counterfeiting, encryption-decryption, logic gates.

Language: Английский

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Mechanically Tunable Circularly Polarized Luminescence of Liquid Crystal‐Templated Chiral Perovskite Quantum Dots

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

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

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Jan. 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.

Language: Английский

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Intense Left‐handed Circularly Polarized Luminescence in Chiral Nematic Hydroxypropyl Cellulose Composite Films

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

Published: Jan. 25, 2024

Abstract Integrating optically active components into chiral photonic cellulose to fabricate circularly polarized luminescent materials has transformative potential in disease detection, asymmetric reactions, and anticounterfeiting techniques. However, the lack of cellulose‐based left‐handed light (L‐CPL) emissions hampers progress these functionalizations. Here, this work proposes an unprecedented strategy: incorporating a nematic organization hydroxypropyl with robust aggregation‐induced emission luminogens generate intense L‐CPL emission. By utilizing N , ‐dimethylformamide as good solvent for fluorescent matrices, produces right‐handed structure film uniform appearance reflective states. Remarkably, system integrates high factor (0.51) impressive quantum yield (55.8%) one fascinating composite. More meaningfully, approach is versatile, allowing incorporation luminogen derivatives emitting multicolored L‐CPL. These films possess exceptional mechanical flexibility (toughness up 0.9 MJ m −3 ) structural stability even under harsh environmental exposures, making them promising fabrication various products. Additionally, can be cast on fabrics reveal multilevel durable capabilities or used source induce enantioselective photopolymerization, thereby offering significant diverse practical applications.

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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Double-Model Decay Strategy Integrating Persistent Photogenic Radicaloids with Dynamic Circularly Polarized Doublet Radiance and Triplet Afterglow

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(11), P. 7668 - 7678

Published: March 7, 2024

Organic phosphors integrating circularly polarized persistent luminescence (CPPL) across the visible range are widespread for applications in optical information encryption, bioimaging, and 3D display, but pursuit of color-tunable CPPL single-component organics remains a formidable task. Herein, via situ photoimplanting radical ion pairing into axial chiral crystals, we present elucidate an unprecedented double-module decay strategy to achieve colorful through combination stable triplet emission from neutral diphosphine doublet radiance photogenic radicals exclusive crystalline framework. Owing photoactivation-dependent component inherent phosphorescence asymmetric environment, CPL vision can be regulated by altering photoactivation observation time window, allowing glow tuning blue orange delayed green emission. Mechanism studies clearly reveal that this electron migration environment hybrid n–π* π–π* instincts responsible afterglow at ambient conditions. Moreover, demonstrate displays encryption manipulation both excitation times.

Language: Английский

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Chiral silver cluster-based light-harvesting systems: Enantioselective chirality transfer and amplified circularly polarized luminescence

Chem, Journal Year: 2024, Volume and Issue: 10(6), P. 1766 - 1782

Published: Feb. 21, 2024

Language: Английский

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

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

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