Halogen Bonding: A New Platform for Achieving Multi‐Stimuli‐Responsive Persistent Phosphorescence

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(13)

Опубликована: Фев. 1, 2022

Monotonous luminescence has always been a major factor limiting the application of organic room-temperature phosphorescence (RTP) materials. Enhancing and regulating intermolecular interactions between host guest is an effective strategy to achieve excellent performance. In this study, halogen bonding (CN⋅⋅⋅Br) was introduced into host-guest RTP system. The interaction promoted intersystem crossing stabilized triplet excitons, thus helping strong emission. addition, weak sensitive external stimuli such as heat, mechanical force, X-rays. Therefore, excitons were easily quenched colorimetric multi-stimuli responsive behaviors realized, which greatly enriched functionality This method provides new platform for future design materials based on molecules.

Язык: Английский

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Research Progress of Intramolecular π‐Stacked Small Molecules for Device Applications

Advanced Materials, Год журнала: 2021, Номер 34(22)

Опубликована: Окт. 1, 2021

Abstract Organic semiconductors can be designed and constructed in π‐stacked structures instead of the conventional π‐conjugated structures. Through‐space interaction (TSI) occurs optoelectronic materials. Thus, unlike electronic coupling along conjugated chain, functional groups stack closely to facilitate spatial electron communication. Using motifs, chemists materials scientists find new ways for constructing with aggregation‐induced emission (AIE), thermally activated delayed fluorescence (TADF), circularly polarized luminescence (CPL), room‐temperature phosphorescence (RTP), as well enhanced molecular conductance. devices based on molecules have exhibited very promising performance, some them exceeding analogues. Recently, reports various organic grown rapidly, prompting this review. Representative scaffolds newly developed systems could stimulate more attention through‐space charge transfer well‐known through‐bond transfer. Finally, opportunities challenges utilizing improving particular are discussed. The previous achievements upcoming prospects may provide insights into theory, materials, field semiconductors.

Язык: Английский

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Future‐Oriented Advanced Diarylethene Photoswitches: From Molecular Design to Spontaneous Assembly Systems

Advanced Materials, Год журнала: 2021, Номер 34(16)

Опубликована: Дек. 6, 2021

Diarylethene (DAE) photoswitch is a new and promising family of photochromic molecules has shown superior performance as smart trigger in stimulus-responsive materials. During the past few decades, DAE achieved leap from simple to functional developed toward validity universal switching building block. In recent years, introduction into an assembly system been attractive strategy that enables behavior blocks be manifested at level entire system, beyond unit itself. This assembly-based will bring many unexpected results promote design manufacture generation advanced Here, advances fabrication diarylethene materials science, chemistry, biomedicine are reviewed.

Язык: Английский

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Aggregation in carbon dots

Aggregate, Год журнала: 2022, Номер 3(6)

Опубликована: Ноя. 21, 2022

Abstract Carbon dots (CDs) possess outstanding luminescence properties, making them widely used in optical displays, anti‐counterfeiting systems, bioimaging, and sensors. Presently, there is much debate about the classification of CDs, as well their formation process, structure, fluorescence mechanisms. Aggregation plays an important role (e.g., aggregation‐induced emission) yet seldom studied detail. This review aims fill this knowledge gap, by first exploring how aggregation leads to different types CDs graphene quantum dots, carbon carbonized polymer dots), followed a detailed examination effect morphology on properties application CDs. Finally, opportunities challenges for various applications are discussed, with need better mechanistic understanding being imperative.

Язык: Английский

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Force-triggered hypso- and bathochromic bidirectional fluorescence switching beyond 120 nm and its anticounterfeiting applications

Science Advances, Год журнала: 2024, Номер 10(7)

Опубликована: Фев. 16, 2024

Achieving high-contrast tricolor emissive regulation of a single-component molecule using single type external stimulus is highly desirable but challenging. In the present study, we report symmetric acceptor-donor-acceptor (A-D-A)–type aggregation-induced emission-active luminogen, which displays sequential fluorescence switching just by anisotropic mechanical grinding. Specifically, upon light grinding, an orange–yellow-to-blue hypsochromic mechanofluorochromic response with distinct color contrast (change in maximum emission wavelength, Δλ em,max = 122 nm) noticed, and slightly ground solid exhibits blue-to-red (Δλ 185 bathochromic conversion vigorous Thus, luminogen developed here, can realize wide-range > 100 hypso- mechanochromisms simultaneously. The tricolored phenomenon attributed to two different morphological transitions involving crystalline-to-crystalline crystalline-to-amorphous states. Furthermore, three information anticounterfeiting systems are presented here.

Язык: Английский

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Schiff Base Aggregation-Induced Emission Luminogens for Sensing Applications: A Review

ACS Sensors, Год журнала: 2022, Номер 7(9), С. 2521 - 2536

Опубликована: Сен. 1, 2022

Fluorescence sensing can not only identify a target substrate qualitatively but also achieve the purpose of quantitative detection through change fluorescence signal. It has advantages immense sensitivity, rapid response, and excellent selectivity. The proposed aggregation-induced emission (AIE) concept solves problem traditional fluorescent molecules becoming weak or quenched in high concentration aggregated state conditions. Schiff base probes have simple synthesis, low toxicity, easy design. They are often used for various substances. In this review we cover late developments compounds with AIE characteristics working as sensors.

Язык: Английский

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Information Storage Based on Stimuli‐Responsive Fluorescent 3D Code Materials

Advanced Functional Materials, Год журнала: 2022, Номер 32(20)

Опубликована: Фев. 18, 2022

Abstract With the booming of information technology, considerable progress has been witnessed in storage carriers, accompanied by soaring capacity. 3D codes as an emerging carrier attracted wide attention. However, it is challenging for conventional to transform their encoded information, restricting applications. Due rich color characteristics and various stimuli responsiveness, fluorescent materials can be utilized construct stimuli‐responsive code systems that exhibit pattern changes upon specific external stimuli, thereby realizing transformation. According type several kinds are classified summarized, including pH ion light electricity time some separate multiple responsiveness. This review summarizes recent systems, elaborates on how they realize transformation, analyzes potential applications, puts forward perspectives further development this field. The authors anticipate provide guidelines design novel promote science technology.

Язык: Английский

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Stimuli-fluorochromic smart organic materials

Chemical Society Reviews, Год журнала: 2024, Номер 53(3), С. 1090 - 1166

Опубликована: Янв. 1, 2024

This review highlights the developments in stimuli-fluorochromic π-conjugated solids beyond organometallic and organic light-responsive compounds, addressing design strategies, mechanisms, limitations, challenges, opportunities.

Язык: Английский

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A Dihydroazulene‐Based Photofluorochromic AIE System for Rewritable 4D Information Encryption

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(37)

Опубликована: Июль 16, 2022

Dynamic patterns based on luminescent materials play an essential role in the digital age. However, it is still challenging to develop highly emissive photofluorochromic with dynamic behaviors store information multiple characteristics. Here, we report a series of dihydroazulene-based compounds which show typical aggregation-induced emission (AIE) effect. Moreover, photo-switching ability dihydroazulene units, undergoing light-induced ring-opening, enables properties. The photofluorochromism also shows quantitively described responses time and temperature via reverse ring-closing process. Ultimately, rewritable 4D system, embedded quick response code, dot matrix microstructures, color fluorescence, time/temperature-dependent intensity change, established patterns. This work not only develops AIE skeleton properties but provides new strategy for encryption cybernetics.

Язык: Английский

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Full‐Color Emissive D‐D‐A Carbazole Luminophores: Red‐to‐NIR Mechano‐fluorochromism, Aggregation‐Induced Near‐Infrared Emission, and Application in Photodynamic Therapy

Chemistry - A European Journal, Год журнала: 2022, Номер 29(11)

Опубликована: Дек. 22, 2022

The preparation of multifunctionalized luminophores with full-color emission based on an identical core skeleton is a significative but challenging research topic. In this work, eight donor-donor-acceptor (D-D-A)-type luminogens central carbazole bearing C6 hydrocarbon chain were designed by using different kinds donor and acceptor units the left right, synthesized in good yields. These D-D-A derivatives display deep-blue, sky-blue, cyan, green, yellow-green, yellow, orange red fluorescence solid state, achieving covering whole visible light range under UV illumination. Notably, dicyano-functionalized triphenylamine-containing derivative exhibits rare aggregation-induced near-infrared red-to-near-infrared mechano-fluorochromism high contrast beyond 100 nm. Furthermore, red-emissive luminogen can serve as potential candidate for cell imaging photodynamic therapy (PDT). This work not only provides reference construction emissive systems also opens new avenue to capable simultaneous application near-Infrared mechanical-force sensors PDT fields.

Язык: Английский

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