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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Multiple confinement-limited activation and defect effect co-triggered the ultra-long lifetime of carbon dots

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 156781 - 156781

Опубликована: Окт. 1, 2024

Язык: Английский

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Amorphous Aggregation Enhanced Room Temperature Phosphorescence Emission From Naphthalimide Derivative

Macromolecular Chemistry and Physics, Год журнала: 2025, Номер unknown

Опубликована: Март 8, 2025

Abstract In recent years, organic room temperature phosphorescence (RTP) materials have been well developed. Especially, when the compounds are doped into a rigid polymeric matrix, their RTP performances can be greatly enhanced. However, dispersibility and stability of difficult to controlled. Herein, an amorphous homo‐polymer ( P1 ) containing naphthalimide units is synthesized further dispersed polyvinyl alcohol (PVA) matrix via solution mixing procedure. The resultant composites P1@PVA exhibit yellow afterglow under temperature. , chromophores constrained in aggregation state. Unlike crystalline state, intermolecular interactions between aggregated enhanced, while π–π interaction weakened. presence PVA, non‐radiative decay synergistically suppressed by external hydrogen bonds internal interactions. As results, much Comparing with PVA compounds, lifetime prolonged as 1.5 folds.

Язык: Английский

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A Streamlined Approach to Anticounterfeiting Technologies: Patterned AAO Membranes Based on Photonic Crystal Effects with Tunable Color Shifts and pH Responsiveness

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 14, 2025

Anticounterfeiting technologies have become increasingly crucial due to the growing issue of counterfeit goods, particularly in high-value industries. Traditional methods such as barcodes and holograms are prone replication, prompting need for advanced, cost-effective, efficient solutions. In this work, a practical application anodic aluminum oxide (AAO) membranes presented anticounterfeiting, which addresses challenges high production costs complex fabrication processes. Unlike previous approaches requiring metal coatings color generation, method uses commercial foils produce colorful AAO without layers. Elemental mapping suggests that impurities on surface contribute enhanced reflectivity, aiding photonic crystal formation. A two-step anodization process creates patterned is further introduced, with pattern clarity controlled by time. Additionally, pH-responsive film composed 2-anilino-6-dibutylaminofluoran (ODB-2) thermoplastic polyurethane (TPU) integrated, enabling dynamic changes under varying pH conditions, enhancing anticounterfeiting functionality. This streamlined approach provides scalable cost-effective solution developing versatile industrial applications.

Язык: Английский

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Ultralong Room Temperature Phosphorescence through Both Space Confinement and Long-Range Charge Migration

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Март 12, 2025

Doping guest materials into host with a confined space to suppress nonradiative decay is an effective strategy for achieving room-temperature phosphorescence (RTP). However, constructing host–guest doped ultralong RTP (URTP) still challenging. Herein, by embedding three coumarin derivatives boric acid via one-step heat treatment, the URTP material afterglow lasting up 60 s, lifetime of 1.59 and quantum yield 18.14% was successfully prepared. Experimental results show that dense 3D boron oxide network formed after along B–O covalent bonds O→B coordination between guest, effectively suppresses transitions through both physical chemical confinement. More importantly, oxygen vacancy defects in during combined charge-separated states generated molecules upon irradiation, together facilitated long-range charge migration process. In addition, recombination accompanied long-lived emission. Finally, prepared exhibit potential applications encryption decryption information security fields.

Язык: Английский

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High-Temperature Phosphorescence of Carbon Dots by a Synergistic Locking Strategy

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Апрель 7, 2025

Phosphorescent materials have potential applications in anticounterfeiting and optoelectronics, but their luminescence is generally quenched at elevated temperatures. Herein, a synergistic locking strategy has been developed to achieve high-temperature phosphorescence (HTP) of carbon dot (CD) composites. Impressively, the CD composites retain over 90% 75% intensity temperatures up 110 170 °C, respectively. Even higher than persists for 5 s, demonstrating remarkable stabilization triplet excitons. Experimental theoretical results revealed that this outstanding thermal resistance stems from effect interlayer covalent bridges multiple hydrogen bonding interface. Furthermore, by adjusting degree graphitization, multicolor HTP ranging blue red achieved This work not only provides facile versatile way construct CD-based also expands heat-resistant display environments.

Язык: Английский

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Achieving Ultralong Room-Temperature Phosphorescence Via Single-Bond Locking Planarization Strategy

ACS Materials Letters, Год журнала: 2024, Номер 6(12), С. 5384 - 5391

Опубликована: Ноя. 8, 2024

Ultralong room-temperature phosphorescence (URTP) materials have been widely studied due to their broad applications. However, achieving phosphorescent with ultralong lifetimes is engaging and challenging. In this work, the indolo[3,2,1-j,k]carbazole (ICZ) excellent planarity obtained through twice single-bond locking on triphenylamine (TPA). Doping ICZ into a rigid matrix, URTP lifetime of 3.24 s photoluminescence quantum yield 37.37% successfully prepared.. The analysis single-crystal, temperature-dependent photophysical characterization, Huang–Rhys factor, theoretical calculations demonstrates that it possible make molecules more planar by locking, which can inhibit structural relaxation excited state thus reduce nonradiative transition generate URTP. addition, we achieve full-color afterglow energy transfer. potential applications anticounterfeiting optoelectronic information display these conducted. This work an important reference for construction materials.

Язык: Английский

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Time-dependent phosphorescence from carbon dots enables multidimensional photoactivated printing and tunable molecular calculations

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 157819 - 157819

Опубликована: Ноя. 1, 2024

Язык: Английский

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