Revisiting organic charge-transfer cocrystals for wide-range tunable, ambient phosphorescence

Kongasseri, Anju Ajayan; Ansari, Shagufi Naz; Garain, Swadhin; Wagalgave, Sopan M.; George, Subi J.

doi:10.1039/d3sc04001a

Cited by 21 publications

(1 citation statement)

References 55 publications

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“…Pure organic RTP materials have become a hot topic for scientists due to their low toxicity, safety, environmental protection, and low price. Researchers have developed crystal engineering, − heavy atom effect, , H-aggregation, , host–guest doping, − introduction of polymer matrix, − and some other methods to generate pure organic long-lived RTP materials with excellent luminescence properties in atmospheric environments. However, the crystal preparation conditions are harsh and not suitable for large-area preparation, which will create the situations, such as brittleness, inflexiblity, and instability in the use process .…”

Section: Introductionmentioning

confidence: 99%

Multicolor Room-Temperature Phosphorescence Achieved by Intrinsic Polymers Containing Solely One Phosphor Unit

Huang,

Qu,

Gao

et al. 2024

Macromolecules

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Room-temperature phosphorescence (RTP) materials have attracted much attention due to their unique luminescence properties. However, it is very challenging to tune the afterglow color of pure amorphous polymers by using only one kind of phosphor unit so far. Here, we proposed a strategy to induce pyrene derivatives (VPY) into the main chain of the polymer by free radical copolymerization, followed by alcoholysis to form poly(vinyl alcohol) derivative materials (PVA–PVPY) with strong hydrogen bond network structures. It was surprising that the obtained intrinsic polymers containing only one kind of phosphor unit achieved multicolor long-lived RTP. The RTP performance of the obtained polymers exhibited concentration, excitation, and time dependence. The experimental and theoretical results demonstrated that these characteristics were attributed to the different aggregated states of phosphor units in polymer chains, which revealed the luminescence mechanism of the aggregated and isolated states of phosphor units to produce multicolor RTP. In addition, we explored the application of these polymers based on color-tunable RTP properties in information encryption and flexible wearables. This strategy contributes to the development of multicolored smart luminescent materials as well as flexible wearable materials.

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Section: Introductionmentioning

confidence: 99%

Multicolor Room-Temperature Phosphorescence Achieved by Intrinsic Polymers Containing Solely One Phosphor Unit

Huang,

Qu,

Gao

et al. 2024

Macromolecules

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Manipulating Single‐Molecule Exciplex TADF and Deep‐Blue RTP Through Non‐Covalent π–π Interaction in a Molecular Foldamer

Huang,

Yu,

Chen

et al. 2024

Advanced Optical Materials

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Although the π–π stacking has been widely applied for constructing aggregated emitters in optoelectronics fields, the role of intramolecular non‐covalent π–π interactions has not been well studied. Here, a supramolecular foldermer M‐σ‐C, with the electron donor (D) and acceptor (A) units spatially separated with a non‐covalent bond at a close distance by methylene linker is designed and synthesized. This gives a face‐to‐face D/A stacking configuration with supramolecular π–π interactions. Temperature‐dependent nuclear magnetic resonance measurements and single crystal analyses confirm its folding configuration. In solutions, M‐σ‐C exhibits a single‐molecule exciplex thermally activated delayed fluorescence (TADF) property ascribing to the efficient intramolecular through‐space charge transfer (CT) process. While single‐molecule deep‐blue room temperature phosphorescence (RTP) with a long afterglow lifetime of 236 ms is observed in a nonpolar matrix, which represents the record lifetime among current 3CT‐character featured RTP. This work indicates that intramolecular non‐covalent interactions play an important role in manipulating high‐performance single‐molecule exciplex TADF and RTP, and provide a feasible molecular design strategy for supramolecular chemistry involving the development of optoelectronic materials.

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Ultralong thermally activated delayed fluorescence based on intermolecular charge transfer induced by isomer in carbazole derivative

Chen,

Zhang,

Xie

et al. 2024

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Ultralong thermally activated delayed fluorescence (UTADF) materials play an important role in realizing time‐dependent color‐tunable afterglow. Some typical carbazole (Cz) derivatives have been reported to exhibit UTADF properties. However, a 10‐fold difference in TADF lifetime was found between commercial Cz derivatives and the corresponding lab‐synthesized ones, which indicated that UTADF may not be derived from the single Cz derivatives as reported. To reveal the real mechanism, we synthesized three Cz derivatives and one isomer to form three host‐guest pairs for optical studies. The photophysical properties revealed that UTADF originated from the intermolecular charge transfer between host and guest, while the ultralong organic phosphorescence was from the guest. Thanks to the rich color variations in luminescence displayed by 4‐(1H‐benzo[f]indol‐1‐yl)−4′‐(9H‐carbazol‐9‐yl)‐[1,1′‐biphenyl]−3,3′‐dicarbonitrile/4,4′‐di(9H‐carbazol‐9‐yl)‐[1,1′‐biphenyl]−3,3′‐dicarbonitrile (CBP‐2CN) at different delay times, it can be applied to realize multi‐dimensional encryption in both delay time and luminescent color.

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Revisiting organic charge-transfer cocrystals for wide-range tunable, ambient phosphorescence

Abstract: A wide-range tunable triplet charge-transfer (3CT) phosphorescence emission is achieved by an intermolecular through-space charge-transfer cocrystallization approach using pyromellitic diimide as the acceptor and different donors.

Cited by 21 publications

References 55 publications

Multicolor Room-Temperature Phosphorescence Achieved by Intrinsic Polymers Containing Solely One Phosphor Unit

Multicolor Room-Temperature Phosphorescence Achieved by Intrinsic Polymers Containing Solely One Phosphor Unit

Manipulating Single‐Molecule Exciplex TADF and Deep‐Blue RTP Through Non‐Covalent π–π Interaction in a Molecular Foldamer

Ultralong thermally activated delayed fluorescence based on intermolecular charge transfer induced by isomer in carbazole derivative

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