Dynamic room-temperature phosphorescence by reversible transformation of photo-induced free radicals

Yao, Xiaokang; Shi, Huifang; Wang, Xiao; Wang, He; Li, Qiuying; Li, Yuxin; Liang, Jian; Li, Jingjie; He, Yixiao; Ma, Huili; Huang, Wei; An, Zhongfu

doi:10.1007/s11426-022-1255-1

Cited by 21 publications

(11 citation statements)

References 56 publications

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“…The radical anion and radical cation with different stabilities could decay gradually through multiple possible channels, including reacting with oxygen in the atmosphere, [43][44][45][46] back electron-transfer to neutral molecules, 47,48 eliminating halogen in the anion 49,50 and reorganizing radical molecular structures, 51 etc. These complexities should be associated with different evolution trends in the time-dependent EPR spectra.…”

Section: Resultsmentioning

confidence: 99%

Manipulating D–A interaction to achieve stable photoinduced organic radicals in triphenylphosphine crystals

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Manipulating D–A interaction to achieve stable photoinduced organic radicals in triphenylphosphine crystals

et al. 2023

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“…Prof. Zhongfu An and Guoqing Zhang et al have reported that some naphthalene imide derivatives can generate free radicals after photoactivation. [34,35] Therefore, both naphthalimide and dimethylamino groups in M2 leads to the formation of intramolecular donor-acceptor structure, which also leads to the generation of M2 intramolecular charge separation states. To further determine the existence of the D-A structure, we simulated the HOMO/LUMO orbitals of M2 molecules and optimized the ground state structure using B3LYP/6-311G (d,p) and described by Multiwfn software.…”

Section: Photo-physical Properties Characterization Of Polymers In Fi...mentioning

confidence: 99%

Long Lifetime Delayed Fluorescent Materials with Water and Temperature Tolerability Based on Charge Separation States

Lü

Zhou

et al. 2023

Advanced Optical Materials

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Long lifetime delayed fluorescent materials have great potential applications in bioimaging, anti‐counterfeiting encryption, lighting, and other fields. However, the preparation of functionalized long lifetime fluorescent materials with simple chemical structure and tunable luminescent behavior still poses significant challenges. In this article, a simple and effective method to prepare a series of long lifetime delayed fluorescent copolymers with temperature and humidity tolerance is presented. This method involves the copolymerization of 2‐bromo‐5‐hydroxybenzaldehyde derivative monomer (M1), which contains electron‐withdrawing groups, with naphthalimide derivative fluorescent monomer (M2), which contains electron‐donating groups. The results demonstrate that long‐range charge transfer occurs between the two components in copolymers, forming charge‐separated states that emit long lifetime delayed fluorescence after exciton recombination. The delayed luminescent behavior of the copolymer is directly influenced by the content of the M2 component. The maximum delayed fluorescence lifetime can reach 13.7 ms, and the fluorescence quantum yield is 39%. Interestingly, the polymer film of P3 can emit a maximum afterglow of 1.00 s after photoactivation. Even after being immersed in water for 49 days, the afterglow remains unchanged. Besides, the afterglow of P3 can exist for ≈0.43 s at 323 K. Even at 373 K, the afterglow for 0.2 s can still be observed.

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“…The widespread counterfeiting of banknotes, certificates, brands, pharmaceuticals, and jewelry has become a serious worldwide problem because of its harmful effects on the global economy, security, and health. − Developing anti-counterfeiting materials is highly desirable to increase the level of security. , Over the past few decades, various macroscopic patterns have been developed to prevent counterfeiting and information leakage, including watermarking, holograms, barcodes, and QR codes. − However, these strategies are relatively changeless and easy to copy . Therefore, photoresponsive materials have attracted accumulated attention due to their variable color or fluorescence triggered by light, − providing tremendous potential for information encryption. , Among these photoresponsive systems, liquid crystal (LC) performs excellently in tunability and responsiveness .…”

Section: Introductionmentioning

confidence: 99%

Quadri-Dimensional Anti-counterfeiting Flexible Label Programmed by a Photoresponsive Liquid Crystal Polymer Film

Liang

Zheng

et al. 2023

Ind. Eng. Chem. Res.

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Creating flexible materials with multi-dimensional security holds great promise for anti-counterfeiting labels in food, currency, and pharmaceuticals, but it is proven extremely challenging. Herein, we propose a photoresponsive liquid crystal polymer (LCP) film by incorporating polymerizable photoswitch into commercial LCP with ultraviolet (UV) light exposure. Reversible photochromism can be observed between light- and dark-red under UV and visible light irradiation alternatively, accompanying by variation of fluorescence intensity. In addition, a series of photonic microstructures are written on the flexible LCP film by taking advantage of the predefined patterned light. A quadri-dimensional anti-counterfeiting flexible label, featuring photochromism, fluorescence, embedded microstructures, and optical diffraction is constructed with the assistance of photoresponsive LCP film. This strategy represents a beneficial step toward flexible anti-counterfeiting materials, which enhances the secure level for practical product engineering applications.

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Dynamic room-temperature phosphorescence by reversible transformation of photo-induced free radicals

Cited by 21 publications

References 56 publications

Manipulating D–A interaction to achieve stable photoinduced organic radicals in triphenylphosphine crystals

Manipulating D–A interaction to achieve stable photoinduced organic radicals in triphenylphosphine crystals

Long Lifetime Delayed Fluorescent Materials with Water and Temperature Tolerability Based on Charge Separation States

Quadri-Dimensional Anti-counterfeiting Flexible Label Programmed by a Photoresponsive Liquid Crystal Polymer Film

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