Application of room-temperature phosphorescent carbon dots in information encryption and anti-counterfeiting

Nano Today, Journal Year: 2024, Volume and Issue: 55, P. 102200 - 102200

Published: Feb. 13, 2024

Language: Английский

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Tailored Fabrication of Full‐Color Ultrastable Room‐Temperature Phosphorescence Carbon Dots Composites with Unexpected Thermally Activated Delayed Fluorescence

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(27)

Published: April 23, 2024

Abstract The development of single‐system materials that exhibit both multicolor room‐temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) with tunable after glow colors channels is challenging. In this study, four metal‐free carbon dots (CDs) are developed through structural tailoring, panchromatic high‐brightness RTP achieved via strong chemical encapsulation in urea. maximum lifetime quantum yield reaches 2141 ms 56.55%, respectively. Moreover, CDs‐IV@urea, prepared coreshell interaction engineering, exhibits a dual afterglow red green TADF. degree conjugation functional groups precursors affects the binding interactions nitrogen cladding on CDs, which turn stabilizes triplet energy levels gap between S 1 T (Δ E ST ) to induce RTP. enhanced wrapping lowers Δ , promoting reverse intersystem crossing, leads This fully state, thus stabilizing material water, even extreme environments such as acids oxidants. These tested multicolor, time, temperature multiencryption well vivo bioimaging. Hence, these have promising practical applications information security biomedical diagnosis treatment.

Language: Английский

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Multicolor Afterglow Carbon Dots: Luminescence Regulation, Preparation, and Application

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(25)

Published: Feb. 6, 2024

Abstract Afterglow materials have attracted much attention owing to their long luminescence lifetimes, large Stokes shifts, and emission without real‐time excitation. Compared with traditional organic afterglow materials, carbon dots (CDs), as a new material, superior properties such easy preparation, low toxicity, cost. The color of CDs can be regulated by external factors excitation wavelength, temperature, time, which is highly significant for expanding the diversified applications make them available biotechnology information applications. This review summarizes research progress multicolor in recent years, including regulation strategies, preparation methods, First, are classified into three strategies: room temperature phosphorescence (RTP), thermally activated delayed fluorescence converted RTP, based on Förster resonance energy transfer, strategies regulating analyzed. Second, methods achieving summarized both matrix‐free matrix‐confined aspects. Then, anticounterfeiting encryption, sensing bioimaging introduced detail. Finally, future challenges opportunities prospected provide ideas controlled design wide application.

Language: Английский

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A green and effective anti-corrosion and anti-microbial inhibitor of citric acid-based carbon dots: Experiment and mechanism analysis

Journal of Materials Research and Technology, Journal Year: 2024, Volume and Issue: 32, P. 2149 - 2159

Published: Aug. 10, 2024

Citric acid-based carbon dots (CA-CDs) with different amounts of heteroatoms N were obtained through hydrothermal synthesis method. The microstructure, optical, antibacterial and anticorrosive behaviors systematically analyzed. Through detection, the atoms existed in form pyridine-like N, pyrrole-like graphitic promoted grain coarsening dots. CA-N-CDs displayed obvious pH dependence good stability from optical behavior analysis. ability citric was improved by inserting atom, rate directly proportional to amount which up 95% for E. coli S. aureus. However, anticorrosion showed an initial increase followed a decrease as atom increased, reaching its peak at CA-N12%-CDs. At this moment, corrosion current density (icorr) metal 4.68 × 10−6 A/cm2, decreased 122 times compared blank solution. Meanwhile, inhibition (IE) 96%, mainly depended on tight adsorption surface.

Language: Английский

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Synthesis of antibacterial fluorescent carbon dots and green coal-like hydrochar from tea Industry byproducts via hydrothermal carbonization

Industrial Crops and Products, Journal Year: 2024, Volume and Issue: 221, P. 119364 - 119364

Published: Aug. 3, 2024

Language: Английский

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High pH Stability and Ultralong‐Lived Room Temperature Phosphorescence Carbon Dots in Aqueous Environment

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(16)

Published: April 27, 2024

Abstract Long‐lived room temperature phosphorescence (RTP) materials have many potential applications in areas such as luminescent lighting, biological imaging, and information security owing to their unique optical properties. However, traditional RTP are challenged by the fact that can be easily quenched dissolved oxygen solvent‐assisted relaxation, making it difficult for them emit aqueous solutions, particularly extreme pH environments. In this study, a multicolor carbon dot‐based composite material (u‐CDs) is developed with urea 3‐aminophenylboronic acid raw materials. This exhibits ultra‐long emission lifetime high stability constructing rigid hydrogen bond network structure an environment. The u‐CDs optimal of 448 nm, quantum yield 21.6%, 2.35 s, afterglow time more than 50 s. With properties, great anti‐counterfeiting, encryption, 3D printing.

Language: Английский

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Folic acid-based carbon dots as an environmentally friendly and functional inhibitor for metal protection

Arabian Journal of Chemistry, Journal Year: 2025, Volume and Issue: 0, P. 1 - 12

Published: March 13, 2025

Language: Английский

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Recent advances in fluorescence and afterglow of CDs in matrices

Nanoscale Horizons, Journal Year: 2024, Volume and Issue: 9(7), P. 1072 - 1098

Published: Jan. 1, 2024

Carbon dots (CDs) are novel nanomaterials with dimensions less than 10 nm that have attracted much attention due to their outstanding optical properties.

Language: Английский

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Sunlight‐Activated Room‐Temperature Phosphorescent Carbon Dots

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 20, 2024

Abstract The efficient utilization of clean and safe sunlight as an excitation source for room‐temperature phosphorescent (RTP) materials is crucial practical applications in solar energy. Herein, sunlight‐activated RTP nitrogen‐doped carbon dots @ alumina (N‐CDs@Al 2 O 3 ) composites with long lifetime exceptional stability are designed fabricated using situ preparation strategy. N‐CDs@Al display bright yellow (more than 18 s to the naked eye) when activated by sunlight. results indicate that introduction nitrogen into CDs not only promotes effective filling triplet excitons but also facilitates red‐shift absorption spectrum CDs. high rigidity structure Al stable strong covalent bonds effectively protect excitons. Additionally, numerous oxygen vacancy defects formed under appropriate calcination conditions store release Finally, application multi‐color 3D artworks, defense markings, emergency signs demonstrated. This work provides design principles feasible strategies development new materials.

Language: Английский

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Influence of carbon quantum dots as modifier and SiO2 shell coating as a protecting layer in YAlO3:Cr3+ phosphors for multimodal applications

Inorganic Chemistry Communications, Journal Year: 2024, Volume and Issue: 170, P. 113468 - 113468

Published: Nov. 4, 2024

Language: Английский

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