Free Radical-Mediated Intramolecular Photocyclization of AIEgens Based on 2,3-Diphenylbenzo[b]thiophene S,S-Dioxide DOI
Jingjing Guo, Jianqing Li, Tai‐Sing Wu

et al.

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(14), P. 7837 - 7844

Published: March 30, 2023

As an important category of photochemical reactions, photocyclization is regarded as ideal entry point for building intelligent photoresponsive materials. Herein, a series aggregation-induced emission luminogens (AIEgens) with sensitive behavior are developed based on 2,3-diphenylbenzo[b]thiophene S,S-dioxide (DP-BTO), and the impacts substituents different electronic structures investigated. The comprehensive experimental computational characterizations reveal that their activity resulted from triplet diradical-mediated intramolecular photocyclization, followed by dehydrogenation to yield stable polycyclic photoproducts. This process active in solution but suppressed solid state, thus can act supplementary nonradiative decay channel excited state contribute AIE effect. Moreover, generated diradical intermediates upon light irradiation effectively inhibit growth S. aureus, indicative promising application antibacterial agents. work provides in-depth mechanistic description about DP-BTO derivatives furnishes perspective correlation photophysical property.

Language: Английский

A Multiresponsive Functional AIEgen for Spatiotemporal Pattern Control and All‐round Information Encryption DOI
Xinyuan He, Jianyu Zhang,

Xinyue Liu

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(18)

Published: March 3, 2023

Functional materials with multi-responsive properties and good controllability are highly desired for developing bioinspired intelligent multifunctional systems. Although some chromic molecules have been developed, it is still challenging to realize in situ multicolor fluorescence changes based on a single luminogen. Herein, we reported an aggregation-induced emission (AIE) luminogen called CPVCM, which can undergo specific amination primary amines trigger luminescence change photoarrangement under UV irradiation at the same active site. Detailed mechanistic insights were carried out illustrate reactivity reaction pathways. Accordingly, multiple-colored images, quick response code dynamic colors, all-round information encryption system demonstrated show of multiple controls responses. It believed that this work not only provides strategy develop multiresponsive luminogens but also develops luminescent materials.

Language: Английский

Citations

33
Regulating the proximity effect of heterocycle-containing AIEgens DOI Creative Commons
Jianyu Zhang, Yujie Tu, Hanchen Shen

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: June 24, 2023

Abstract Proximity effect, which refers to the low-lying ( n ,π*) and (π,π*) states with close energy levels, usually plays a negative role in luminescent behaviors of heterocyclic luminogens. However, no systematic study attempts reveal manipulate proximity effect on properties. Here, we report series methylquinoxaline derivatives different electron-donating groups, show photophysical properties aggregation-induced emission behaviors. Experimental results theoretical calculation gradually changed levels coupling effects closely related states, intrinsically regulate these With intrinsic nature heterocycle-containing compounds, they are utilized for sensors information encryption dynamic responses acid/base stimuli. This work reveals both positive impacts systems provides perspective develop functional responsive luminogens

Language: Английский

Citations

33
A General Strategy for Developing Ultrasensitive “Transistor‐Like” Thermochromic Fluorescent Materials for Multilevel Information Encryption DOI
Ke Zhang, Xiaobo Zhou, Shijie Li

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(44)

Published: July 12, 2023

Abstract Thermochromic fluorescent materials (TFMs) exhibit great potential in information encryption applications but are limited by low thermosensitivity, poor color tunability, and a wide temperature‐responsive range. Herein, novel strategy for constructing highly sensitive TFMs with tunable emission (450–650 nm) toward multilevel is proposed, which employs polarity‐sensitive fluorophores donor–acceptor–donor (D–A–D) type structures as emitters long‐chain alkanes thermosensitive loading matrixes. The structure–function relationships between the performance of both phase‐change molecules systematically studied. Benefiting from above design, obtained over 9500‐fold fluorescence enhancement temperature change, well ultrahigh relative sensitivity up to 80% K −1 , first confirmed. Thanks superior transducing performance, above‐prepared can be further developed information‐storage platforms within relatively narrow interval variation, including temperature‐dominated multicolored display encryption. This work will not only provide perspective designing also bring inspiration design preparation other response‐switching‐type probes conversion efficiency.

Language: Английский

Citations

31
Hydrazone‐Based AIEgens with Photofluorochromic Ability for Rewritable, Intensity‐Variable, and High‐Resolution Photopattern DOI
Minjie Zhang, Jianyu Zhang, Parvej Alam

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(12)

Published: Jan. 13, 2023

Abstract Photoswitches with multiple fluorescence states known as photofluorochromism upon photo‐induced isomerization show practical applications in information storage, anticounterfeiting, and sensors. However, it is still challenging to realize rapid isomerization, efficient fluorescence, gradient signal output simultaneously. Herein, by incorporating luminogenic units aggregation‐induced emission (AIE) features into photo‐responsive hydrazone, a series of novel photofluorochromic AIE compounds are developed. These newly designed exhibit quantum yields up 38.4% could undergo reversible swift photo‐isomerization 450/365 nm irradiation. Accordingly, the fabricated photopatterns based on them utilized quantitatively described images for which excellent rewritability intensity‐variable high resolution 10 µm. This work provides new strategy develop intelligent photopattern systems continuous storage cybernetics.

Language: Английский

Citations

24
Hydrogen Bond‐Associated Photofluorochromism for Time‐Resolved Information Encryption and Anti‐counterfeiting DOI

Yuqian Xie,

Xiaomei Zhao, Hong Wang

et al.

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

Published: Aug. 23, 2024

Abstract Time‐resolved photofluorochromism constitutes a powerful approach to enhance information encryption security but remains challenging. Herein, we report strategy of using hydrogen bonds regulate the time for initiating photofluorochromism. In our strategy, copolymers containing negative photochromic spiropyran (NSP), naphthalimide, and multiple hydrogen‐bonding (UPy) units are designed, which display photo‐switchable fluorescence resonance energy transfer (FRET) process from naphthalimide donor NSP acceptor. Interestingly, FRET is locked via dynamic interaction between ring‐opened UPy moieties, resulting in time‐dependent fluorescence. The change can be finely regulated fraction polymers. Besides novel fluorescence, polymers also take advantage visible‐light triggerable, excellent photostability, photoreversibility, processability. We demonstrate that these properties enable them many application opportunities such as fluorescent labels multilevel patterns.

Language: Английский

Citations

11
Schizophrenic Shape Memory Hydrogel with Hidden Morphological Information for Transient Encryption DOI

Jianlei Lu,

Chujun Ni, Xin Wen

et al.

Chemistry of Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Language: Английский

Citations

1
Bio‐Inspired Cholesteric Phase Cellulose Composite with Thermochromic and Circularly Polarized Structural Color for Multilevel Encryption DOI Open Access
Xiaoxiang Wen, Jinxia Zhang, Jianing Li

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(2)

Published: Sept. 26, 2023

Abstract The escalating need for enhanced cryptographic security necessitates the development of advanced materials designed secure storage and transmission information. Drawing inspiration from unique color‐altering polarizing capabilities beetles, this work develops a transparent, thermochromic, circularly polarized cholesteric phase cellulose composite (CPCC). This is achieved by integrating self‐assembled hydroxypropyl with liquid crystal (CLC) structure in tandem crosslinked poly(N‐isopropyl acrylamide) (PNIPAM) network. crosslinking density impacts response degree thermochromism, which can be regulated modifying UV exposure time during PNIPAM production. CLC CPCC uniquely results reflected right light. When coupled waveplates, mechanism inverts rotation direction light, creating orthogonal structural colors different brightness levels under left excellent transparency facilitates seamless integration environment, offering optimal camouflage. Sophisticated techniques, such as color coding Morse coding, further incorporated within to increase encryption complexity decryption. Collectively, CPCC's transparency, chirality present significant potential design high‐security information encryption, contributing valuable insights field.

Language: Английский

Citations

20
Photo‐Response with Radical Afterglow by Regulation of Spin Populations and Hole‐Electron Distributions DOI
Yujie Yang, Jiaqiang Wang, Jie Yang

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(24)

Published: March 29, 2023

Abstract No matter photoinduced organic radicals have been reported frequently, they are usually non‐luminescent at ambient conditions. The internal mechanism on stability and electronic transitions of radicals, is thus crucial for the development relevant materials. Herein, a series radical emission systems were developed conveniently through doping benzoic acids into hydrogen donor polyvinyl alcohol (PVA) matrix. Visual photochromism could be observed Ph‐3COOH @PVA film with formation cyclohexadienyl‐type structure. For first time, afterglow appeared energy transfer from triplet state. appropriate introduction carboxylic groups to three nonadjacent carbon atoms benzene ring was best decreasing spin population promoting radical. This study largely expands property both practical application.

Language: Английский

Citations

19
Rewritable Photoluminescence and Structural Color Display for Dual‐Responsive Optical Encryption DOI

Hyowon Han,

Jin Woo Oh,

Hyeokjung Lee

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(14)

Published: Dec. 25, 2023

Optical encryption using coloration and photoluminescent (PL) materials can provide highly secure data protection with direct intuitive identification of encrypted information. Encryption capable independently controlling wavelength-tunable as well variable light intensity PL is not adequately demonstrated yet. Herein, a rewritable structural color (SC) display suitable for dual-responsive optical developed stimuli-responsive SC block copolymer (BCP) photonic crystal (PC) alternating in-plane lamellae, which variety 3D 2D perovskite nanocrystals preferentially self-assembled characteristic PL, presented. The BCP PC controlled in the visible range different precursor doping times. are luminescent, quantum yield ≈33.7%, yielding environmentally stable dual-mode displays. programmed information erasable rewritable. Dual-responsive demonstrated, true Morse code deciphered only when encoded by SCs properly combined Numerous combinations realize high security level anticounterfeiting. This offers novel anti-counterfeiting.

Language: Английский

Citations

18
Dynamic Color‐Switching of Hydrogel Micropillar Array under Ethanol Vapor for Optical Encryption DOI

Ming‐Xia Zhou,

Feng Jin,

Jianyu Wang

et al.

Small, Journal Year: 2023, Volume and Issue: 19(47)

Published: July 21, 2023

Responsive structural colors from artificially engineered micro/nanostructures are critical to the development of anti-counterfeiting, optical encryption, and intelligent display. Herein, responsive color hydrogel micropillar array is demonstrated under external stimulus ethanol vapor. Micropillar arrays with full fabricated via femtosecond laser direct writing by controlling height diameter micropillars according FDTD simulation. Color-switching achieved in <1 s due formation liquid film among micropillars. More importantly, blueshift sensitive diameter, instead height. The a 772 nm takes 400 ms complete vapor, while that 522 blueshifts at 2400 ms. Microscale patterns realized employing size-dependent color-switching designed Moreover, Morse code directional arrays. advantages controllable would be prospective areas dynamic display, anti-counterfeiting.

Language: Английский

Citations

17