A dynamic assembly-induced emissive system for advanced information encryption with time-dependent security

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: July 20, 2022

Abstract The development of advanced materials for information encryption with time-dependent features is essential to meet the increasing demand on security. Herein, smart orthogonal and temporal properties are successfully developed based a dynamic assembly-induced multicolour supramolecular system. Multicolour fluorescence, including blue, orange even white light emissions, achieved by controlling assembly pyrene derivatives tailoring solvent composition. By taking advantage tuneable dynamically controlled functions, e.g., 3D codes, developed. Moreover, materials, such as multi-information displays 4D also enabling fluorescence-controllable system in solid phase, showing multiple pieces time scale, correct can be identified only at specified time. This work provides an inspiring point design higher security requirements.

Language: Английский

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Photoresponsive Supramolecular Polymers: From Light‐Controlled Small Molecules to Smart Materials

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(10)

Published: Oct. 14, 2022

Photoresponsive supramolecular polymers are well-organized assemblies based on highly oriented and reversible noncovalent interactions containing photosensitive molecules as (co-)monomers. They have attracted increasing interest in smart materials dynamic systems with precisely controllable functions, such light-driven soft actuators, photoresponsive fluorescent anticounterfeiting light-triggered electronic devices. The present review discusses light-activated used their main photo-induced changes, e.g., geometry, dipole moment, chirality. Based these distinct formed by exhibit disassembly reassembly. As a consequence, polymerization, "depolymerization," regulation of the lengths topologies observed. Moreover, light-controlled functions polymers, actuation, emission, chirality transfer along length scales, highlighted. Furthermore, perspective challenges future opportunities is presented. Besides challenge moving from harmful UV light to visible/near IR avoiding fatigue, enabling biomedical applications, include actuators helical motion, light-modulated information transmission, optically recyclable materials, multi-stimuli-responsive systems.

Language: Английский

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Resonance-Induced Stimuli-Responsive Capacity Modulation of Organic Ultralong Room Temperature Phosphorescence

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(15), P. 6946 - 6953

Published: March 22, 2022

Organic ultralong room temperature phosphorescence (OURTP) materials having stimuli-responsive attributes have attracted great attention due to their potential in a wide variety of advanced applications. It is fundamental importance but challengeable develop OURTP materials, especially such with modulated optoelectronic properties controlled manner probably the lack an authentic construction approach. Here, we propose effective strategy for controllably regulated by engineering resonance linkage between flexible chain and phosphor units. A quantitative parameter demonstrate capacity also established responsivity rate constant. The designed efficient photoactivated lifetimes up 724 ms tunable constants ranging from 0.132 0.308 min–1 upon continuous UV irradiation. Moreover, applications been illustrated rewritable paper snapshot Morse code multiple information encryption. Our works, which enable accomplishment capable on-demand manipulated optical properties, viable design explore smart giving deep insights into dynamically process.

Language: Английский

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A Time‐Dependent Fluorescent Hydrogel for “Time‐Lock” Information Encryption

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(49)

Published: Oct. 3, 2022

Abstract Information encryption has become increasingly important in recent years; however, information materials, especially those encrypting on a time scale, are still fancy. Herein, “time‐lock” material is developed based time‐dependent fluorescent hydrogel. The fluorescence color of this hydrogel can be regulated between green and yellow, with distinctive changes intensity, scale by controlling the concentration urea/urease HCl. By taking advantage feature, “time‐locked” encoded. Such self‐erases time, moreover, fake or even opposing generated during process. correct only recognized at specified i.e., using “time‐key” to decrypt information. This feature endows higher level security provides new insight for encryption.

Language: Английский

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Reversible Triple-Mode Switching in Photoluminescence from 0D Hybrid Antimony Halides

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(15), P. 6985 - 6995

Published: July 19, 2022

Hybrid metal halides are an emerging class of highly efficient photoluminescent (PL) materials. However, very few them show reversible on–off PL switching under external stimuli and have the potential to perform as next-generation intelligent materials with applications in cutting-edge photoelectric devices. Herein, we report single crystal-to-single crystal (SC–SC) structural transitions among three 0D hybrid antimony halides, namely, nonemissive α-[DHEP]SbCl5 (1), yellow-emissive β-[DHEP]SbCl5·2H2O (2), red-emissive β-[DHEP]SbCl5 (3), by a dynamic phonon-engineering strategy. The SC–SC transformation between 1 2 is triggered acetone or methanol, affording switching. transition solids achieved 3 through process removal/adsorption guest water molecules. Meanwhile, performed introduction which accompanied quenching red emission. Therefore, triple-mode off–onI–onII–off realized halide hybrids for first time, including off–onI (yellow), color-tunable onI–onII (yellow-red), onII–off (red) modes. More importantly, make suitable successful protection anti-counterfeiting confidential information well optical logic gates.

Language: Английский

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A Calix[3]acridan‐Based Host–Guest Cocrystal Exhibiting Efficient Thermally Activated Delayed Fluorescence

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(15)

Published: Feb. 11, 2022

A supramolecular strategy to construct thermally activated delayed fluorescence (TADF) materials through host-guest charge transfer interactions was proposed. Consequently, a new class of macrocycle namely calix[3]acridan conveniently synthesized in 90 % yield. The cocrystal formed by and 1,2-dicyanobenzene exhibited efficient TADF properties due intense intermolecular interactions. Moreover, the spatially separated highest occupied molecular orbital lowest unoccupied resulted very small singlet-triplet energy gap 0.014 eV hence guaranteed an reverse intersystem crossing for TADF. Especially, high photoluminescence quantum yield 70 achieved, it represents value among reported donor-acceptor materials.

Language: Английский

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Single‐Component 0D Metal–Organic Halides with Color‐Variable Long‐Afterglow toward Multi‐Level Information Security and White‐Light LED

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(18)

Published: Feb. 7, 2023

Abstract The optical anti‐counterfeiting science and technology are currently restricted by the limited information loading capacity, thus development of multi‐level high‐security systems is urgently needed but still challenging. Herein, design strategies (including ASCII/5D codes dynamic storage) reported incorporation abundant multi‐central luminescence time‐resolved, excitation‐dependent ultralong phosphorescence. Self‐assembly new single‐component 0D organic–inorganic metal halides (OIMHs) facilely achieved, which exhibit divisible all‐phosphorescence, thermally activated delayed fluorescence, single‐molecule white‐light emission, as proved experiments theoretical calculations. Interestingly, combing advantages both inorganic cluster π‐conjugation in OIMHs, time‐dependent afterglow affords color‐variable emission a wide wavelength range larger than 100 nm, providing extra color‐time dimensions for encryption compared to traditional single‐color fluorescent anti‐counterfeiting. Moreover, white light‐emitting diode device further developed show high lighting ability OIMH. Therefore, this study paves an effective way fabricate cluster‐based hybrids equipping different emitters confer diverse photoluminescence manners satisfy down‐to‐earth application requirements.

Language: Английский

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Achieving Stimuli-Responsive Amorphous Organic Afterglow in Single-Component Copolymer through Self-Doping

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(13), P. 7343 - 7351

Published: March 10, 2023

The development of stimuli-responsive materials with afterglow emission is highly desirable but remains a formidable challenge in single-component material system. Herein, we propose strategy to achieve photoactivated variety amorphous copolymers through self-doping, endowed by the synergetic effect self-host-induced guest sensitization and thermal-processed polymer rigidification for boosting generation stabilization triplet excitons. Upon continuous ultraviolet illumination regulating oxygen concentration, showing increased lifetimes from 0.34 867.4 ms realized. These emissions can be naturally or quickly deactivated pristine state under ambient conditions heating treatment. Interestingly, programmable reusable patterns, conceptual pulse-width indicators, "excitation-time lock" Morse code are successfully established using polymers as recorded media. findings offer an avenue construct polymeric system organic features demonstrate superiority remarkable applications.

Language: Английский

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Reversible Triple-Mode Photo- and Radioluminescence and Nonlinear Optical Switching in Highly Efficient 0D Hybrid Cuprous Halides

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(17), P. 6598 - 6611

Published: Aug. 17, 2023

Multifunctional stimuli-responsive luminescent and optical switching is extremely crucial for wide advanced photonic applications, but it remains a challenging objective halide perovskites. Herein, by performing single-crystal to (SC–SC) transformation as dynamic molecular strategy, we realized reversible triple-mode photoluminescence, radioluminescence (PL RL), nonlinear (NLO) in pair of zero-dimensional (0D) hybrid cuprous halides [ETPP]2Cu4Br6 [ETPP]CuBr2. Specifically, [ETPP]CuBr2 display highly efficient yellow green light emissions under UV excitation with the highest quantum yield up near unity. Simultaneously, identical can also be activated using X-ray RL 57,974 photons MeV–1, surpassing most previously reported halides. Most remarkably, SC–SC between them an ethanol impregnation-heating process, which provides PL/RL transitions two light-emitting states. Additionally, this process accompanied transition centrosymmetric NLO-inactive noncentrosymmetric NLO-active through second harmonic generation (SHG) "silent-active" switching. To best our knowledge, first PL, RL, SHG perovskite chemistry, realize applications data storage, information security, logic gates, etc.

Language: Английский

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High‐Temperature, Reversible, and Robust Thermochromic Fluorescence Based on Rb₂MnBr₄(H₂O)₂ for Anti‐Counterfeiting

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

Published: May 12, 2023

Thermochromic fluorescent materials (TFMs) characterized by noticeable emission color variation with temperature have attracted pervasive attention for their frontier application in stimulus-response and optical encryption technologies. However, existing TFMs typically suffer from weak PL reversibility as well limited mild operating severe quenching. switching under extreme conditions such high will undoubtedly improve security, while it is still challenging present TFMs. In this work, high-temperature thermochromic fluorescence up to 473 K robust structural of 80 cycles are observed Rb2 MnBr4 (H2 O)2 related crystals, which seldom reported changes at a temperature. Temperature-driven nonluminous, red green light states can be achieved specific temperatures the modulation mechanism verified situ measurements single particle transition. By virtue unique feature, multicolor anti-counterfeiting label based on broad gradient multidimensional information applications demonstrated. This work opens window design inorganic multi-PL change development advanced strategies stimuli source.

Language: Английский

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