Achieving High‐Temperature Resistant Afterglow by Modulating Dual‐Mode Emission of Organic Emitters through Defects Engineering

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

Abstract Dual‐mode afterglow, integrating ultralong phosphorescence and delayed fluorescence, offers promising opportunities for developing high‐temperature resistant luminescent materials. However, there is an obvious gap between the emission lifetime of fluorescence phosphorescence. In this work, a dehydration‐induced doping strategy proposed to achieve afterglow by balancing lifetime. The critical role structural defects demonstrated in mechanism, where energy transferred defect states guest molecules determines afterglow. addition, efficient reverse intersystem crossing processes are achieved singlet states, facilitating long‐lived fluorescence. These synergistic effects result prolonged approach that phosphorescence, which produced materials, even up 125 °C. results provide clue modulating dynamics materials applications information security, biomedical diagnosis, chemical sensing.

Language: Английский

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Host-guest doped organic room temperature phosphorescence with a dual-fused-ring effect for near-infrared multiple-anticounterfeiting applications

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, Journal Year: 2025, Volume and Issue: unknown, P. 126111 - 126111

Published: March 1, 2025

Language: Английский

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High-Temperature Dynamic Organic Phosphorescence Based On Cyclodextrins Supramolecular Assemblies

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

Published: April 14, 2025

Dynamic organic phosphorescent materials present great potential for practical applications. But the temperature-sensitive nature of phosphors makes development high-temperature dynamic phosphorescence (HTDOP) a significant challenge. Herein, we report HTDOP system assembled from β-cyclodextrins (β-CDs) and 4-diphenylamino-benzoic acid (TPAC). The TPAC@β-CDs complex exhibits only short-lived fluorescence at room temperature but transitions to emission with an ultralong lifetime up 567 ± 13 ms upon heating. A mechanistic study combining spectroscopic analysis, 1H NMR, Fourier Transform Infrared Spectroscopy revealed that intermolecular hydrogen bonding interactions effectively suppressed nonradiative relaxation triplets even as high 140 °C. Meanwhile, elevated temperatures also drive oxygen out system, significantly reducing quenching processes ensuring robust survival HTDOP. Additionally, introduction fluorescent dyes permits color regulation afterglow green red through Förster resonance energy transfer triplet singlet state. Moreover, this system's fast reliable response it excellent candidate overtemperature trace detection in electronic components circuit diagnostics. This work discloses effective strategy constructing systems can be fully exploited range fields.

Language: Английский

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Lattice arrangement induced the transition from bipolar to n-type enhancing the spin polarization and the magnetic field dependent dipole effect in organic crystals

Applied Physics Letters, Journal Year: 2025, Volume and Issue: 126(16)

Published: April 21, 2025

The discovery of molecular entities is an effective way to expand and modulate the electronic spin properties organic semiconductors. In this work, we have fabricated cocrystals with identical donors acceptors that undergo a unique structural rearrangement, leading formation two polymorphs distinct space groups. One n-type, other one bipolar. variation in unipolar bipolar structure significantly impacts electric polarization, fluorescence lifetime, polarization. By transitioning transport from significant difference charge–lattice interactions becomes evident, offering enhancement both polarization dipolar Also, magnetic field could effectively tune present magnetoelectric coupling crystals. This facilitates development functional materials devices magnetoelectrics.

Language: Английский

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Exploring isomeric impurity for relebactam key intermediate: Directed synthesis, characterization, crystal structure, DFT calculations, Hirshfeld surface, and molecular docking studies

Journal of Molecular Structure, Journal Year: 2025, Volume and Issue: unknown, P. 142543 - 142543

Published: April 1, 2025

Language: Английский

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Coordinated Solvent Molecules Enable the Excellent Capabilities of Two Zn²⁺‐Based Complexes in Detecting l‐Arginine via Long‐Lived Luminescence Recovery

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(40)

Published: May 20, 2024

Abstract Luminescence metal–organic materials (MOMs) are widely used as probes for detection. However, most of such based on fluorescence and work in either turn‐off or turn‐on mode. In contrast, long‐lived (>10 ms) (LLPs) with recovery response to analyte quite rare. Herein “solvation complex” strategy is prepare two new afterglow complexes multiple coordinated solvents, trans ‐complex 1 both delayed (DF) room temperature phosphorescence (RTP), cis 2 RTP. Remarkably, they can serve selective LLPs l ‐Arginine detection, limit detection down 1.0 × 10 −7 M. addition, heating/fumigation induce reversible arousal/silence their afterglow, while H O/DMSO vapor fumigation causes crystalline‐to‐crystalline transformation between them. Detailed mechanism studies reveal that the change solvent, including loss/acquisition, exchange, replacement, plays a key role multi‐stimuli‐responsive properties. This not only shows potential luminescence complex but also reveals unique advantages solvation preparation

Language: Английский

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Conformation‐Controlled Double Phosphorescence Components From A Single Organic Molecule: Time‐Dependent and Excitation‐Dependent Wide‐Range Afterglow Color Change

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

Published: Oct. 23, 2024

Abstract Double phosphorescence components from a single organic molecule is rarely reported before because most molecules must follow Kasha's rule and merely emit T 1 state. We discover unique phenomenon of conformation‐controlled expression double components. The green component the red are assigned to dinaphthylamine moiety pyrene unit N,N‐di(naphthalen‐2‐yl)pyren‐1‐amine (NaPy), respectively. NaPy shows time‐dependent excitation‐dependent afterglow color change in copolymerized MMA film at room temperature due simultaneous However, PMMA MA film, just expresses component, suggesting that matrix rigidity greatly affects via altering conformation NaPy. In low‐rigidity matrix, dyanmic free rotation triplet excitons relax T1 state inner conversion or vibration relaxation, leading sole component. high‐rigidity highly twisted stabilized limitation 2 return S0 separately, resulting Thus, follows but disobeys matrix. can function relatively independently, wide‐range change.

Language: Английский

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Chiral cocrystals with circularly polarized persistent phosphorescence and large second harmonic generation

Surfaces and Interfaces, Journal Year: 2025, Volume and Issue: unknown, P. 106114 - 106114

Published: Feb. 1, 2025

Language: Английский

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Supramolecular self-sorting assembly enabling liquid-phase ultralong organic phosphorescence with multicolor fluorescence for dual-modality detection

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161092 - 161092

Published: Feb. 1, 2025

Language: Английский

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Cyclization Boosted Long-Lived Polymeric Phosphorescence under Ambient Conditions

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

Language: Английский

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