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

Advanced Science, Journal Year: 2024, Volume and Issue: 11(32)

Published: June 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.

Language: Английский

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Multistimuli-Responsive Room-Temperature Phosphorescence: Adjustable Electrostatic Interactions and the Corresponding Accurate Molecular Packing

ACS Materials Letters, Journal Year: 2024, Volume and Issue: unknown, P. 4639 - 4648

Published: Sept. 6, 2024

Language: Английский

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Naphthalimide‐Conjugated Spiropyran: Dual‐State Emission and Photo‐Responsive Dynamic Fluorescence Color for Information Encryption Application

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

Published: Feb. 14, 2025

Abstract Developing photo‐switch molecules that show fluorescence in both monomeric and aggregated states, with light‐controllable wavelength is far‐reaching a great challenge. Spiropyran (SP) has received considerable attention this field. Herein, by conjugating naphthalimide to the indole moiety of SP, new spiropyran derivative, named NMI‐SP obtained. shows dual‐state emission excellent its attributed intramolecular charge transfer character. Moreover, demonstrates obvious photochromic behavior, accompanied visible color change from yellow green THF solution, photo‐responsive orange red state. This work provides insights into design materials based on SP fluorophore highlights their potential applications digital coding information conversion.

Language: Английский

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High‐Security Plastic with Integrated Holographic and Phosphorescent Images

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

Published: Feb. 19, 2025

Abstract Organic room temperature phosphorescence (ORTP) polymer materials have sparked considerable research interests in recent years, but their optical function is still limited for multi‐mode imaging. Herein, a feasible and universal approach proposed to endow ORTP with periodic refractive index modulation functions by holographic patterning. The key this design two‐stage stepwise crosslinking. Stage‐1, low crosslinking density (≤0.75 mol L −1 ), phosphorescence‐silent can provide greater free volume monomer diffusion thus facilitate the patterning of modulated holograms via photopolymerization‐induced phase separation. dense at stage‐2 turn on intensity rising 144% when increases from 3.77 4.12 . enhanced primarily ascribed increase conformational distortion spin‐orbit coupling organic phosphors based theoretical calculations. Eventually, first example demonstrated plastic unique capability independently displaying andphosphorescent images. This work not only provides novel paradigm impart added also paves way development high‐security combat counterfeiting.

Language: Английский

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Accurately adjusted phenothiazine conformations: reversible conformation transformation at room temperature and self-recoverable stimuli-responsive phosphorescence

Light Science & Applications, Journal Year: 2025, Volume and Issue: 14(1)

Published: Feb. 26, 2025

Abstract Conformational flexibility is essential to the stimuli-responsive property of organic materials, but achieving reversible molecular transformation still challenging in functional materials for high energy barriers and restriction by intermolecular interactions. Herein, through incorporation various steric hindrances into phenothiazine derivatives with different positions quantities tune conformations adjustable repulsive forces, folded angles gradually changed from 180° 90° 17 compounds. When angle located at 112° moderated effect, dynamic under mechanical force has been achieved low mutually regulated motions, resulting both self-recoverable phosphorescence properties first time. It opened up a new way realize self-recovery which can facilitate multi-functional smart avenue other fields inspiration.

Language: Английский

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Large-Scale Syntheses of Multicolor Stimulus Responsive Room-Temperature Phosphorescent Polymer-Carbonyl-Modified Carbon Nitrogen Quantum Dots

The Journal of Physical Chemistry Letters, Journal Year: 2024, Volume and Issue: 15(6), P. 1584 - 1589

Published: Feb. 2, 2024

Carbonyl-modified solid-state carbon nitrogen quantum dots (m-O═CNQDs) have emerged as promising room-temperature phosphorescent (RTP) materials close to commercialization. However, high-crystallinity m-O═CNQDs are insensitive external stimuli such water and heat due strong stacking interactions between layers, restricting their applications in stimulus responsive fields. Here, a polymer template space-confined growth strategy is established for the large-scale synthesis of polyvinylpyrrolidone-functionalized with ultralong phosphorescence (181 ms) using urea PVP precursors. Theoretical experimental results indicate that linked at rim formed by situ self-polymerization inhibits layers increases affinity water, which key increasing sensitivity water. This offers new path developing commercial RTP materials.

Language: Английский

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Polymer Free Volume‐Controlled Molecular Clock and Emitter for Multicolored Transient Data Display in Advanced Photonic Cryptography

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(38)

Published: June 26, 2024

The booming demand on data security has aroused great interest for developing smart materials with temporal display feature and dynamic multicolor fluorescence. However, it remains challenging to implement both features most responsive molecules. Herein, we construct a polymer free volume-controlled "molecular clock emitter" via covalently embedding multi-stimuli molecular switch (i.e., spiropyran) into network poly(pentafluorophenyl acrylate)) programmable crosslink density volume. By the aminolysis of pentafluorophenyl ester different amount diamine crosslinkers, pPFPA-co-SP networks controllable densities are generated, which have confinement effects rate constant SP/MC isomerization, thus leading time-dependent photochromism. In addition, PTF1, fluorescent probe that is sensitive rigidity, introduced further endow system phototunable full-color emission. Therefore, relying their synergistical responses rigidity network, successfully developed versatile emitter an "one stone two birds" manner, shows along fluorescence switching, providing potential advanced encryption anticounterfeiting high level.

Language: Английский

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Self-healing photoluminescent polymers with photosensitive behavior for information storage and multiple-level dynamic encryption

Chemical Science, Journal Year: 2024, Volume and Issue: 15(33), P. 13306 - 13312

Published: Jan. 1, 2024

A family of light-responsive photoluminescent materials with self-healing properties were obtained and applied in dynamic multi-level information encryption applications.

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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Alkyl Chain Length Dependent Luminescence and Single‐Component White‐Light Emission from Gemini Aliphatic Quaternary Ammonium Salts

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(19)

Published: March 14, 2024

Abstract Aliphatic quaternary ammonium salts (QASs) with intrinsic photoluminescence (PL) have drawn increasing attention due to the importance of exploring mechanism ionic emissive clusters, whereas it remains challenging clarify structure–property relationships. Here, effective modulation photophysical properties gemini aliphatic QASs ( n ‐BTADB) is managed by altering alkyl chain length. Boosted quantum yields (up 24.6%), prolonged phosphorescence lifetimes 515.2 ms), and varied PL colors are achieved manipulating aggregation states compounds. Interlaced herringbone packing patterns strong interactions facilitate intersystem crossing process stabilize triplets. The confluence hydrophobic flexibility results in fluctuation as lengthens. Furthermore, single‐component white‐light emission obtained 12‐HBTADB crystals introducing electron‐rich hydroxyls. These shed new light on relationships clusters rational design nonconventional luminophores.

Language: Английский

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