Thermal Activated Reversible Phosphorescence Behavior of Solid Supramolecule Mediated by β‐Cyclodextrin

Advanced Functional Materials, Год журнала: 2024, Номер 34(34)

Опубликована: Март 25, 2024

Abstract A reversible solid thermally responsive deep‐blue pure organic room temperature phosphorescent material is constructed by terephthalic acid (PPA), β ‐cyclodextrin ( ‐CD), and poly(vinylalcohol) (PVA). Attributed to the host‐guest interaction of ‐CD isolate PPA chromophore rigid environment offered hydrogen bonds suppress nonradiative decays, amorphous supramolecular assembly PPA‐CD/PVA not only induces a phosphorescence at 410 nm that differing from traditional derivatives with green emission but also enhances quantum yield up 30.52%. Uncommonly, this film exhibits unique thermal stimulation response property blue cyan color transitions because heating can destroy binding behavior between PPA, resulting in redshift stacking. Additionally, incorporation Rhodamine B (RhB) or Sulforhodamine 101 (SR101) into film, color‐tunable white, yellow, red relying on realized through triplet‐to‐singlet Förster resonance energy transfer (TS‐FRET) platform. These thermochromic materials are successfully applied multilevel anticounterfeiting information encryption, which provides new simple approach for temperature‐responsive TS‐FRET multicolor luminescence materials.

Язык: Английский

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Host-guest doped room/high-temperature phosphorescence of diarylfuro[3,2-b]pyridine derivatives

Chemical Engineering Journal, Год журнала: 2024, Номер 489, С. 150919 - 150919

Опубликована: Апрель 1, 2024

Язык: Английский

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Stepwise Stiffening Chromophore Strategy Realizes a Series of Ultralong Blue Room‐Temperature Phosphorescent Materials

Advanced Science, Год журнала: 2024, Номер 11(32)

Опубликована: Июнь 24, 2024

Abstract Ultralong room‐temperature phosphorescent (URTP) materials have attracted wide attention in anti‐counterfeiting, optoelectronic display, and bio‐imaging due to their special optical properties. However, blue are very scarce during applications because of the need simultaneously populate stabilize high‐energy excited states. In this work, a stepwise stiffening chromophore strategy is proposed suppress non‐radiative jump by continuously reducing internal spin chromophore, successfully developing series materials. Phosphorescence lifetimes more than 3 s achieved, with longest lifetime reaching 5.44 lasting 70 naked eye. As far as know, best result that has been reported. By adjusting conjugation, multicolor phosphorescences from cyan green realized. addition, these chromophores exhibit same excellent properties urea polyvinyl alcohmance (PVA). Finally, applied luminescent displays.

Язык: Английский

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Impurity-Induced Phosphorescence in Purely Organic Materials

ACS Materials Letters, Год журнала: 2024, Номер 6(7), С. 2703 - 2713

Опубликована: Июнь 3, 2024

Metal-free or purely organic phosphorescent materials (phosphors) with ultralong emission lifetimes have emerged as an important class of multifunctional a wide array applications. However, the mechanistic understanding phosphorescence in emitters apparently lags behind practical accomplishments, and existing knowledge has not been summarized properly. For example, despite impurity effect on from metal-free having well-recognized for over century, recent studies rediscovered critical role impurities phosphorescence. Hence, this review aims at bridging apparent gap by integrating prior latest findings In addition, purification methods phosphors, methodologies to test impurity-induced emission, considerations are highlighted.

Язык: Английский

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Dibenzyl Isophthalates as Versatile Hosts in Room Temperature Phosphorescence Host-Guest Systems

Chemical Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Simple yet powerful: dibenzyl isophthalates are easy to modify hosts for room-temperature phosphorescence. These systems achieve record-setting quantum yields and lifetimes while offering unprecedented color tunability across the visible spectrum.

Язык: Английский

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Simultaneously enhancing organic phosphorescence quantum yields and lifetimes for triphenylphosphine salt doped polymer films

Chemical Science, Год журнала: 2024, Номер 15(13), С. 4881 - 4889

Опубликована: Янв. 1, 2024

Simultaneously enhancing the quantum yields and luminescence lifetimes of organic persistent room temperature phosphorescence (RTP) molecules is a priority in photonic area, but it remains formidable challenge. Here, an effective strategy was proposed to improve both efficiencies emission decay times for phosphorescent triphenylphosphine salts. This approach involves integrating electron donor unit into salt

Язык: Английский

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Positional Isomerism Toward Tunable Organic Afterglow and Reversible Photoactivation Behavior for Anti‐Counterfeiting and Encryption

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 20, 2024

Abstract Achieving amorphous polymers with ultralong room‐temperature phosphorescence (RTP), tunable organic afterglow, and reversible photoactivation behavior is highly desirable for practical applications but challenging. Herein, simple positional isomers three carboxyl groups located in the ortho , meta para positions of triphenylamine skeleton are designed synthesized. By physically blending poly(vinyl alcohol) matrix, these show RTP properties, among which ‐isomer has longest lifetime (620.1 ms). Theoretical calculations reveal that more efficient intersystem crossing, slower radiative decay rate lowest triplet excitons, stronger intermolecular hydrogen‐bonding interactions should be responsible superior property ‐isomer. Furthermore, afterglow readily realized via a triplet‐to‐singlet energy transfer process. More impressively, exhibit photoactivated properties after embedding into rigid poly(methyl methacrylate) matrix. Finally, flexible polymer films prepared from potential advanced anti‐counterfeiting multilevel encryption through subtly combining lifetime, behavior.

Язык: Английский

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Photo- and Oxygen- Synergistically Controlled Selective Expression of Organic Phosphorescence Units

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(12), С. 15133 - 15142

Опубликована: Март 15, 2024

Dynamic control of ultralong organic room-temperature phosphorescence (UORTP) is a charming target. Herein, we report stimuli-responsive unit 7H-indolo[2,3-c]quinoline (NBCz) and its derivatives (PCBNBCz, FSO2NBCz, N2BCzSO2NBCz) that show photo- oxygen- synergistically induced afterglow activation color change in the PMMA film. PCBNBCz FSO2NBCz feature donor–acceptor (D–A) structure, N2BCzSO2NBCz features acceptor-bridged two different units (NBCz N2BCz). The photoactivated UORTP arises from photoinduced consumption oxygen It clear NBCz contributes to subsequent because NBCz-doped film shows same process. ESR HRMS measurements confirmed oxidation occurs at nitrogen atom quinoline ring via photogenerated superoxide radicals, which results change. TDDFT calculations proved after NBCz, T1 energy level declines significantly. Furthermore, photocontrolled selective expression achieved case N2BCzSO2NBCz. After further UV irradiation, happened, oxidized form N2BCzSO2NBCz-O emitted intrinsic orange NBCz-O selectively screened yellowish-green N2BCz. Finally, multilevel photolithography can be demonstrated based on This work may give deep insight into pave simple way for development stimulus-responsive smart materials.

Язык: Английский

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Pd/NBE-Catalyzed One-Pot Modular Synthesis of Polycyclic Fused δ-Lactams and Investigation of Room-Temperature Phosphorescence

ACS Catalysis, Год журнала: 2024, Номер 14(16), С. 12181 - 12191

Опубликована: Июль 30, 2024

The advancement of sophisticated synthetic methodologies that streamline reaction processes while enhancing molecular complexity is a perpetual necessity in the realm chemistry. Catalytic one-pot cascade play crucial role efficient construction intricate molecules with exceptional chemoselectivity. Herein, we present approach for synthesis polycyclic fused δ-lactams via sequential phosgenation, Pd/NBE-catalyzed ortho-carbamoylation/ipso-Heck-type cyclization, and C–H activation from readily available aryl halides, amines, triphosgenes. This stands out as first example situ carbamoyl chloride formation amine precursors, presenting an alternative to existing transformations involving chlorides. practical significance these showcased by 81 rapid economically favorable manner, without need intermediate purification. Moreover, were scalable compatible various natural products pharmaceuticals, further underscoring effectiveness this strategy. relatively rigid coplanar structure displayed our synthesized exhibits distinct room-temperature phosphorescence characteristics, which have been utilized anticounterfeiting high-security-level data encryption.

Язык: Английский

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Visualizing Triplet Energy Transfer in Organic Near‐Infrared Phosphorescent Host‐Guest Materials

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(51)

Опубликована: Сен. 21, 2024

Limited by the energy gap law, purely organic materials with efficient near-infrared room temperature phosphorescence are rare and difficult to achieve. Additionally, exciton transition process among different emitting species in host-guest phosphorescent remains elusive, presenting a significant academic challenge. Herein, using modular nonbonding orbital-π bridge-nonbonding orbital (n-π-n) molecular design strategy, we develop series of heavy atom-free phosphors. Systematic modification π-conjugated cores enables construction library tunable from 655 710 nm. These phosphors exhibit excellent performance under ambient conditions when dispersed into 4-bromobenzophenone host matrix, achieving an extended lifetime 11.25 ms maximum efficiency 4.2 %. Notably, eliminating interference phosphorescence, hybrid can be visualized various excitation conditions. Spectroscopic analysis reveals that improved guest originates triplet-triplet transfer abundant triplet excitons generated independently host, rather than enhanced intersystem crossing between singlet state state. The findings provide in-depth insights constructing novel exploring emission mechanisms materials.

Язык: Английский

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