Engineering Tunable Ratiometric Dual Emission in Single Emitter‐based Amorphous Systems

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(10)

Published: Jan. 8, 2024

Molecular emitters with multi-emissive properties are in high demand numerous fields, while these basically depend on specific molecular conformation and packing. For amorphous systems, special arrangement is unnecessary, but it remains challenging to achieve such luminescent behaviors. Herein, we present a general strategy that takes advantage of rigidity S

Language: Английский

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Recent Progress in Nonconventional Luminescent Macromolecules and their Applications

Macromolecules, Journal Year: 2024, Volume and Issue: 57(12), P. 5561 - 5577

Published: June 11, 2024

Traditional π-conjugated luminescent macromolecules typically suffer from aggregation-caused quenching (ACQ) and high cytotoxicity, they require complex synthetic processes. In contrast, nonconventional (NCLMs) with nonconjugated structures possess excellent biocompatibility, ease of preparation, unique luminescence behavior, emerging applications in optoelectronics, biology, medicine. NCLMs are currently believed to produce inherent due through-space conjugation overlapping electron orbitals solid/aggregate states. However, as experimental facts continue exceed expectations or even overturn some previous assumptions, there is still controversy about the detailed luminous mechanism NCLMs, extensive studies needed further explore mechanism. This Perspective highlights recent progress classifies summarizes these advances viewpoint molecular design, exploration, applications, challenges prospects. The aim provide guidance inspiration for huge fundamental practical potential NCLMs.

Language: Английский

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Unconventional Luminescence Polymer with Color‐Tunability based on Solvent‐induced Electrostatic Potential Distribution of Fluorophore

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(47)

Published: Aug. 13, 2024

Abstract Tuning full‐color emission of polymers holds significant promise. However, preparing unconventional luminescence with color‐tunability in dilute solution and understanding the relationship between non‐covalent interactions luminescent behavior remains a great challenge. We report two emitters (P1 P2) incorporating tetracoordinate boron. The P1 non‐conjugated D‐π‐A structure, exhibited red delayed fluorescence at 645 nm quantum yield 9.15 % aggregates. Notably, wavelength can be tuned from 418 to 588 different solvent. Similarly, P2 also adjusted by manipulating solvent fluorophore. Experimental characterization theoretical calculations indicate that B←N bond electronic fluorophore significantly regulate equilibrium electrostatic potential (ESP) intramolecular O⋅⋅⋅O P1, thereby modulating its wavelength. Additionally, these showed excellent fluoride ions detection. This work provides new insights into complex effects intermolecular on properties.

Language: Английский

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Supramolecular nonconventional fluorescent material with tunable emission and electrothermal responsiveness

Polymer, Journal Year: 2025, Volume and Issue: unknown, P. 128118 - 128118

Published: Feb. 1, 2025

Language: Английский

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Functional Heteroatom Substituted Hyperbranched Polymers: Recent Developments and Perspectives

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: 17(9), P. 13324 - 13341

Published: Feb. 20, 2025

Heteroatom-substituted hyperbranched polymers (HBPs) have emerged as a versatile class of functional materials, combining the structural merits architectures with unique chemical functionalities imparted by heteroatoms such boron, silicon, phosphorus, sulfur, selenium, and tellurium. These exhibit distinct physicochemical properties, including low viscosity, excellent solubility, high reactivity, tunable functionality, which position them promising candidates for diverse applications. This Review highlights recent advances in heteroatom substituted HBPs, categorizing from element group their (from Group III to VI, well transition rare-earth metals). The pivotal role modulating polymer properties is explored, key applications highlighted across four principal domains: fluorescent flame retardants, stimuli-responsive polymers, modifications. By integrating insights chemistry, materials science, interdisciplinary research, this underscores potential heteroatom-substituted HBPs addressing current material challenges.

Language: Английский

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Nonconventional aggregation‐induced emission polysiloxanes: Structures, characteristics, and applications

Aggregate, Journal Year: 2023, Volume and Issue: 5(2)

Published: Dec. 8, 2023

Abstract Nonconventional luminescent materials have been rising stars in organic luminophores due to their intrinsic characteristics, including water‐solubility, biocompatibility, and environmental friendliness shown potential applications diverse fields. As an indispensable branch of nonconventional materials, polysiloxanes, which consist electron‐rich auxochromic groups, exhibited outstanding photophysical properties the unique silicon atoms. The flexible Si‐O bonds benefit aggregation, empty 3d orbitals Si atoms can generate coordination N → O Si, altering electron delocalization material improving purity. Herein, we review recent progress polysiloxanes with different topologies discuss challenges perspectives. With emphasis on driving force for aggregation mechanism tuned emissions, role played is highlighted. This may provide new insights into design expand further sensing, biomedicine, lighting devices, etc.

Language: Английский

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Designing Schiff-Based Hyperbranched Polysiloxane for Simultaneously Enhancing Epoxy Resin with Mechanical Properties, Thermal Stability, and Recyclability

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(6), P. 3115 - 3127

Published: March 6, 2024

It is indeed challenging to simultaneously enhance the toughness, thermal stability, and recyclability of epoxy resins. This study presents an approach utilizing a hybrid hyperbranched polysiloxane (STHPSi) structure, which incorporates Schiff base structures (comprising two benzene rings bonded imines), Si–O–Ar (aryl group) segments, abundant terminal sulfhydryl groups. structure was employed fabricate high-quality resins (STHPSi/EP). Experimental techniques including universal testing machines, dynamic mechanical analysis (DMA), thermogravimetric (TGA), scanning electron microscopy (SEM) were utilized assess performance resulting materials. The incorporation STHPSi imparted rigid-flexible nature resins, leading remarkable properties. Notably, not only significantly improved impact strength by 59.8% flexural 20.6% but also contributed enhanced With 6 wt % addition STHPSi, decomposition temperature at 5% weight loss (Td,5%), glass transition (Tg), char residues increased 351.0 °C, 128.06 9.55%, respectively. Furthermore, STHPSi/EP composites exhibited complete degradation in 1,3-diaminopropane degraded substance successfully reintroduced into matrix as curing agent, facilitating recycling waste recycled demonstrated excellent properties, with reaching up 15.3 kJ/m2 149.22 MPa, respectively, interesting luminescent characteristics. effective for preparation reutilization high-performance addressing critical challenges enhancing their properties promoting sustainable materials development.

Language: Английский

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Spring Lock: Constructing Cluster Emitters with Colorful TADF from Non‐Conjugated Polymaleimide Helical Chains

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(38)

Published: April 9, 2024

Abstract Non‐conjugated luminescent polymers have received much attention due to their excellent flexibility, processability, and biocompatibility. However, the single emission color low solid‐state luminescence efficiency restrict further development. Herein, by introducing carboxyl‐terminated alkyl chains on rigid helical polymaleimide backbone, a series of non‐conjugated are designed synthesized. Due “spring lock” formed synergism scalable main flexible side chains, these exhibit effective cluster with thermally activated delayed fluorescence (TADF) property, thereby significantly improving quantum yield up 59.6%. The TADF wavelengths polymer powders can be tuned from 498 639 nm through changing reaction solvents, because conformation forming clusters is sensitive solvent polarity. Interestingly, metal ions induce construct self‐repairing gels, which show potential applications in ammonia detection information encryption. This work not only provides an design strategy for colorful high‐efficiency TADF, but also reveals mechanism enlightens promising gels.

Language: Английский

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Si, B-containing dynamic covalent bonds enable excellent flame retardancy and reduced fire hazards for cyanate ester resin

Materials Horizons, Journal Year: 2024, Volume and Issue: 11(20), P. 5094 - 5102

Published: Jan. 1, 2024

Cyanate ester (CE) resins are distinguished by excellent dielectric properties in electronic packaging materials but face significant fire risks, with existing strategies often compromising their processability or original properties. Herein, we propose an innovative strategy involving the exchange of dynamic covalent bonds under heat stimuli aimed at forming a continuous and compact char layer to enhance safety CE resin. Using straightforward one-pot method, Si-O B-O were integrated into novel hyperbranched polymer (HPSiB), ensuring good compatibility resin while lowering its peak curing temperature 185 °C for facile processability. The resulting material 6 wt% HPSiB exhibits LOI value 32.8% UL-94 V0 rating, especially low total smoke production 6.7 m

Language: Английский

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D–A Clustering-Induced Red Fluorescent Emission of Nonconjugated Maleimide-Based Copolymers

Macromolecules, Journal Year: 2024, Volume and Issue: 57(7), P. 3121 - 3130

Published: March 26, 2024

To develop long-wavelength emissive nontraditional luminescent polymers, which is still challenging, electron-withdrawing maleimide (MI) derivatives were copolymerized with a second monomer containing an electron-donating group by using free radical polymerization. Different from nonemissive homopolymers of both MI and the monomers, copolymers showed significant emissions. Especially, P(DMAA-co-PMI) (DMAA: N,N-dimethylacrylamide, PMI: N-phenylmaleimide) P(NIPAM-co-MI) (NIPAM: N-Isopropylacrylamide) exhibited orange-red emissions (595 630 nm) in solution solid states obvious excitation-dependent fluorescence (EDF). The red-shifted MI-based reasonably attributed to formation through-space conjugated D–A clusters, proved existence van der Waals forces between carbonyl groups hydrogen bonds acceptor donor groups, as revealed theoretical calculation computation results.

Language: Английский

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