Multi‐stimulus Room Temperature Phosphorescent Polymers Sensitive to Light and Acid cyclically with Energy Transfer

Angewandte Chemie, Journal Year: 2023, Volume and Issue: 135(44)

Published: Aug. 19, 2023

Abstract The stimulus‐responsive room temperature phosphorescent (RTP) materials have endowed wide potential applications. In this work, by introducing naphthalene and spiropyran (SP) into polyacrylamide as the energy donor acceptor respectively, a new kind of brilliant dynamic color‐tunable amorphous copolymers were prepared with good stability processibility, afterglow emissions from green to orange in response stimulus photo or acid, thanks multi‐responsibility SP transfer between SP. addition deeply exploring inherent mechanism, these been successfully applied dynamically controllable applications information protection delivery.

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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Achieving Efficient Dark Blue Room‐Temperature Phosphorescence with Ultra‐Wide Range Tunable‐Lifetime

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(22)

Published: March 26, 2024

Abstract Tunable‐lifetime room‐temperature phosphorescence (RTP) materials have been widely studied due to their broad applications. However, only few reports achieved wide‐range lifetime modulation. In this work, ultra‐wide range tunable‐lifetime efficient dark blue RTP were realized by doping methyl benzoate derivatives into polyvinyl alcohol (PVA) matrix. The lifetimes of the doped films can be increased from 32.8 ms 1925.8 ms. Such wide modulation is extremely rare in current reports. Moreover, emission 4‐hydroxybenzoate‐doped film located region and quantum yield reaches as high 15.4 %, which broadens applications organic optoelectronic information. Further studies demonstrated that reason for tunable was magnitude electron‐donating ability substituent group modulates HOMO–LUMO singlet‐triplet energy gap derivatives, well non‐covalent interactions with PVA. potential luminescent displays optical anti‐counterfeiting these high‐performance conducted.

Language: Английский

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Photorewriting, Time-Resolved Encryption, and Unclonable Anticounterfeiting with Artificial Intelligence Authentication via a Reversible Photoswitchable System

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: unknown

Published: April 29, 2024

In the fields of photolithographic patterning, optical anticounterfeiting, and information encryption, reversible photochromic materials with solid-state fluorescence are emerging as a potential class systems. A design strategy for has been proposed synthesized through introduction photoactive thiophene groups into molecular backbone aryl vinyls, compounds unique aggregation-induced emission properties, photocontrollable color-changing properties. This work develops novel inks, films, cellulose hydrogels enhancing security encryption anticounterfeiting technologies. They achieve rapid color change under ultraviolet light irradiation. Dependent upon rate change, higher levels time-resolved can be achieved. feature is important confidentiality encrypted reliability labels. Color-changing hydrogels, films consisting three fluorescent molecules have quick photoactivity, great photoreversibility photostability, good processability, making them ideal time-delayed smart encryption. Furthermore, specialized algorithms used to construct convolutional neural networks, image analysis performed on these systems, thus solving current problem time-consuming decryption process. artificial intelligence method offers new opportunities enhanced data

Language: Английский

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Visualization of Solvent Effect and Oxygen Content via a Red Room-Temperature Phosphorescent Material

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(32), P. 42794 - 42801

Published: Aug. 1, 2024

The development of pure organic room-temperature phosphorescent (RTP) materials greatly facilitates the integrated application luminescent materials. Herein, a type photoactivated red RTP material was constructed by simply doping 4-(benzo[c][1,2,5]thiadiazol-5-ylthio)benzonitrile (p-NNS) into poly(methyl methacrylate) (PMMA) matrix. obtained film realized controllable photoactivation process regulation diverse solvent levels, demonstrating potential advantages in optical anti-counterfeiting applications. Furthermore, properties doped were utilized to detect oxygen content from 2.00% 4.90%, which revealed exact consumption ambient under UV light. Every CIE point luminescence corresponds certain content, illustrating visualization content. remarkable effect and this work will provide competitive for further

Language: Английский

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