Clusterization-Triggered Room-Temperature Phosphorescence of Konjac Glucomannan Foams with High Mechanical Strength

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(2), P. 916 - 924

Published: Jan. 4, 2024

Room-temperature phosphorescence (RTP) materials with high mechanical strength are attractive and important but rarely reported. In this study, konjac glucomannan (KGM), a polysaccharide derived from natural taro, was observed to emit long-lived RTP via clusterization-triggered emission (CTE). The CTE behavior of KGM fully investigated in solution the solid state. distinct concentration-enhanced for aqueous solutions, combined its low toxicity biocompatibility, renders highly promising bioimaging. foams were fixation multiple hydrogen bonds clusters oxygen-containing groups. lifetime foam could reach 351.2 ms, lightweight withstand compressive stress 5.73 MPa. exhibit typical excitation wavelength (λex)-dependent color-tunable RTP, afterglows changing blue-green grass-green as λex is increased 310 365 nm. results indicate that suitable development eco-friendly strength.

Language: Английский

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Recent Advances in Organic Molecular-to-Supramolecular Self-Assembled Room-Temperature Phosphorescent Materials for Biomedical Applications

ACS Applied Bio Materials, Journal Year: 2023, Volume and Issue: 6(11), P. 4572 - 4585

Published: Oct. 26, 2023

This minireview focuses on recent advancements in organic molecular-to-supramolecular self-assembled room-temperature phosphorescent (RTP) materials and their prospective biomedical applications. RTP materials, having unique capacity to emit long-lasting phosphorescence at ambient temperature, have piqued researchers' interest various biological applications, including biosensing, bioimaging, drug delivery, photodynamic therapy (PDT). These several benefits, high sensitivity, remarkable photostability, low cytotoxicity. materials' self-assembly into supramolecular structures improves performance broadens uses. Researchers built systems with by leveraging weak noncovalent interactions aquatic conditions. demonstrated incredible promise as biosensors that enable sensitive analyte detection photosensitizers PDT target sensitize specific cell types. The review also outlines future directions challenges developing utilizing pure for imaging purposes, providing valuable guidelines design application.

Language: Английский

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Role of Halobenzene Guest Molecules in Modulating Room Temperature Phosphorescence of Benzophenone–Naphthalene Diimide Inclusion Crystals

Chemistry - An Asian Journal, Journal Year: 2024, Volume and Issue: 19(5)

Published: Feb. 7, 2024

Materials exhibiting room temperature phosphorescence (RTP) have recently emerged as a subject of significant interest. In this study, we successfully created inclusion crystals by introducing halobenzenes guests into host molecule combining benzophenone with naphthalene diimide. This approach led to the creation fascinating fluorescence and RTP properties dependent on guest molecules. Notably, containing chlorobenzene showed cyan fluorescence, while those iodobenzene displayed red RTP. difference highlights impact luminescent properties, external heavy-atom effect playing key role in promoting efficient intersystem crossing between excited singlet triplet states. Crystals bromobenzene exhibited unique blend RTP, both from diimide, highlighting moderate effect. These findings reveal composite materials remarkably diverse interesting optical characteristics.

Language: Английский

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Co-crystallization and Clustering Afforded Simultaneously Boosted Efficiency, Lifetime, and Color Tunability of Organic Afterglows

The Journal of Physical Chemistry Letters, Journal Year: 2023, Volume and Issue: 14(28), P. 6451 - 6458

Published: July 12, 2023

Pure organic persistent room-temperature phosphorescence (p-RTP) is in urgent demand for advanced optoelectronic and bioelectronic applications. However, it remains an enormous challenge to modulate the emission colors while simultaneously boosting lifetimes efficiencies. Herein, we report co-crystallization between melamine cyclic imide-based non-conventional luminophores, which affords co-crystals owning multiple hydrogen bonds effective clustering of electron-rich units, thus resulting diverse emissive species with highly rigidified conformations promoted spin–orbit coupling. Consequently, p-RTP enhanced efficiencies up 12.0% 898 ms, alongside remarkably improved color tunability, are obtained. These results may spur future rational design high-performance materials advance mechanism understanding origin color-tunable phosphorescence.

Language: Английский

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Achieving Near‐Infrared Phosphorescence Supramolecular Hydrogel Based on Amphiphilic Bromonaphthalimide Pyridinium Hierarchical Assembly

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 26, 2024

Abstract Phosphorescent supramolecular hydrogels are currently a prevalent topic for their great promise in various photonic applications. Herein, an efficient near‐infrared (NIR) phosphorescence hydrogel is reported via the hierarchical assembly strategy aqueous solution, which fabricated from amphiphilic bromonaphthalimide pyridinium derivative (G), exfoliated Laponite (LP) nanosheets, and polymeric polyacrylamide (PAAm). Initially, G spontaneously self‐aggregates into spherical nanoparticles covered with positively charged units emits single fluorescence at 410 nm. Driven by electrostatic interactions negatively subsequently function as cross‐linked binders coassemble LP engendered red room‐temperature (RTP) up to 620 Benefiting hydrogen‐bonding interactions‐mediated physical cross‐linkage, further introduction of PAAm not only significantly elevates mechanical strength showing fast self‐healing capability, but also increases lifetime 2.49 4.20 ms, especially generating even higher temperature ( τ 363 K = 2.46 ms). Additionally, RTP energy transfer occurs after doping small amount organic dye heptamethine cyanine (IR780) acceptor hydrogels, resulting long‐lived NIR emission 823 nm high donor/acceptor ratio, successfully applied cell labeling window.

Language: Английский

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Organic room temperature phosphorescence co‐crystal with reversible acid/base stimulus response

Smart Molecules, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 4, 2025

Abstract Stimulus‐responsive organic room temperature phosphorescent (RTP) materials have received significant attention in bioimaging, sensing, and data storage because of their controllable dynamic variability rapid response. Organic co‐crystals, with tailor‐designed optical properties through manipulation aggregate structures, proven to be very effective elucidating the structure‐property relationship RTP at molecular level. Therefore, enhancing rigid frameworks that promote intersystem crossing is a valid approach. Notably, realization co‐crystal performance by altering components or adjusting crystal lattices highly appealing; however, this has not been fully addressed. In study, an co‐crystal, 4,4′‐bipyridine (44BD), was employed as host, 1,4‐diiodotetrafluorobenzene (DITF) 4‐bromo‐2,3,5,6‐tetrafluorobenzoic acid (TFBA) were guests. The 44BD‐DITF exhibited orange RTP, whereas 44BD‐TFBA displayed bright yellow RTP. Crystal analysis theoretical calculations revealed dense packing abundant intermolecular interactions within these co‐crystals are crucial for emergence both show reversible acid/base stimulus response, is, exposure hydrochloric (HCl) fumes results quenching which can subsequently restored triethylamine (TEA) fumigation. This study presents approach towards switching thus offering opportunities development stimulus‐responsive next‐generation applications.

Language: Английский

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Engineering of imidazo[1,2-a]pyridine into multifunctional dual-state emissive (DSE) luminogens for hydrazine sensing and cell-imaging

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

Published: Jan. 1, 2025

Balancing the donor–acceptor (D–A) systems and spatial configurations to precisely modulate dual-state emission (DSE) properties in imidazo[1,2- a ]pyridine-derived luminogens for applications cell imaging hydrazine sensing.

Language: Английский

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High-Efficiency, Long-Lived, Multicolor Tunable Pure Organic Materials for Dual Fluorescent-Phosphorescent Emission at Room Temperature

ACS Applied Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Currently, numerous afterglow materials often suffer from low phosphorescence quantum yields (ΦPh) and are confined to a singular luminescent color. In this study, we devised an approach by incorporating four distinct carbazole derivative guest molecules, featuring varying degrees of halogen substitution naphthalene group sites, into β-estradiol host molecules through high-temperature melt doping create exceptional organic composites. Remarkably, all exhibit characteristics, including prolonged lifetimes ultrahigh yields, with the pinnacle lifetime soaring 904.76 ms peak yield achieving remarkable 40.0%. Notably, even without heavy atom incorporation, phosphors managed attain ΦPh 18.0%, underscoring their unique properties. Furthermore, our experiments unveiled intriguing phenomenon: rather than single fluorescence or emission, these dual-emission encompassing both phosphorescence. The versatility in luminescence color manipulation was further demonstrated adjusting temperature excitation wavelength, offering unparalleled flexibility. Moreover, hues could be finely tuned number atoms, adding another layer tunability. Theoretical calculations provided valuable insights, showing that changes bromine substitutions positions significantly affect molecule's spin–orbit coupling constants nature its excited states. This understanding not only highlights molecular mechanisms behind observed properties but also provides roadmap for future design optimization such advanced materials.

Language: Английский

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Time‐Resolved and Blue‐Shifted Pure Room‐Temperature Phosphorescence by Dynamic Isolation of Triplet Exciton in Crystal

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

Abstract Organic room‐temperature phosphorescence (RTP) with rich photophysical properties has attracted great interest, but it remains a big challenge to realize pure RTP without fluorescence in steady‐state photoluminescence (SSPL) and blue‐shifted that intrinsically restricted by the spin‐forbidden intersystem crossing (ISC) radiative decay of low‐lying triplet excited state. Herein, two fluorescence‐free molecules based on β‐diketone‐bridged phenoselenazine/phenothiazine are developed, which contain either Se or S heteroatom phosphor significantly promote ISC; and, both isolated J‐aggregated phosphors formed crystal, where J‐aggregation can not only facilitate ISC for also strength emission high phosphorescent quantum yield 22.3%, while affords longer lifetime up 131 ms. Excitingly, (35 nm compare SSPL) from yellow‐green (525 nm) cyan (490 dynamically depending time temperature is observed first time. Experimental theoretical results indicate regulation time/temperature‐dependent attributed different lifetimes aggregated owing dynamic competition between accumulation modes crystal aided interrupted conjugation sp 3 C β‐diketone.

Language: Английский

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Modulating room-temperature phosphorescence of D-π-A luminogens via methyl substitution, positional isomerism, and host–guest doping

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, Journal Year: 2025, Volume and Issue: 330, P. 125763 - 125763

Published: Jan. 19, 2025

Language: Английский

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