Energy‐Efficient Synthesis of Multicolor Carbon Dots: Revealing the Role of Core Size and Surface States on Photoluminescence and Electrochemiluminescence for Anticounterfeiting

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

Published: March 20, 2025

Abstract Carbon dots (CDs) hold immense potential for various optical applications, however, the economical and mild preparation of multicolor carbon (MCDs) remains challenging, correlation between their photoluminescence (PL) electrochemiluminescence (ECL) is still unclear. In this study, five MCDs with emissions from blue to red are rapidly synthesized using a one‐step ion liquid‐assisted wet chemical method under atmospheric pressure, 1‐butyl‐3‐methylimidazolium chloride ([Bmim]Cl) as reaction medium. The resulting exhibit sizes ranging 1.81 3.15 nm, featuring similar surface structures. models used investigate how core size state determine PL ECL. It found that primarily arises excitation emission within core, whereas ECL governed by states. Notably, all near‐infrared ≈760 which red‐shifted relative independent particle size. Leveraging tunable luminescence, pH‐ solvent‐dependent properties, screen‐printing compatibility, luminescent tracers developed anticounterfeiting freshness indicators. This study advances synthesis full‐color CDs offers valuable insights into modulation expanding applications.

Language: Английский

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Algorithm in chemistry: molecular logic gate-based data protection

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

This review focuses on stimuli-responsive material (SRM)-based data protection, emphasizing the integration of intricate logic and algorithms in SRM-constructed hardware. It also discusses current challenges future directions field.

Language: Английский

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

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 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.

Language: Английский

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Construction of Multicolor Phosphorescent Carbon Dots via Multiple Confinement Strategies

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 8, 2025

Organic room-temperature phosphorescence (RTP) materials are widely used in optoelectronics, biological imaging, and chemical sensing because of their long luminous lifetime excellent signal-to-noise ratio. Although multicolor RTP systems show important potential for information encryption, spin-orbit coupling (SOC) weakening exciton quenching caused by molecular motion environmental factors limit stable triplet generation, thereby reducing the quantum yield brightness materials. In this study, we developed a novel carbon dot (CD) to effectively solve these problems using multiconfinement system, demonstrating excitation-dependent properties. The synthesized CDs varies from green orange under different excitation wavelengths, with high photoluminescent (54.22%) (39.53 cd/m2). Through detailed experimental theoretical studies, found that photoluminescence phenomena arise existence multiple luminescence centers, which form complex network structures through hydrogen, covalent, ionic bonds, thus stabilizing excitons enhancing optical addition, synthetic material shows application field encryption anticounterfeiting, achieving dynamic light display functions, improving security anticounterfeiting capabilities.

Language: Английский

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Time‐Division Multiplexing Physical Unclonable Functions Based on Multicolor Phosphorescent Carbon Dots

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

Published: April 13, 2025

Abstract Phosphorescent materials offer a promising approach to information encryption due their long luminescence lifetimes and high signal‐to‐noise ratios. However, fixed phosphorescent patterns are vulnerable imitation over time, limiting effectiveness in advanced encryption. Here, time‐division multiplexing physical unclonable function (TDM‐PUF) label utilizing multicolor carbon dots (CDs) is proposed that leverages variations wavelength lifetime construct time‐resolved, multidimensional cryptographic protocols. Efficient multi‐color phosphorescence CDs achieved by enhancing intersystem crossing, suppressing non‐radiative transitions through confinement effects, regulating emission spectra via energy transfer. The random spatial distribution unpredictable emissions of significantly enhance the complexity PUF system, thereby fortifying its defenses against mimicry attacks. Furthermore, this system exhibits multiple optical responses allowing correct recognition only at specified time nodes, achieving time‐resolved anti‐counterfeiting. Finally, segmenting labels based on color channels, non‐overlapping multi‐time segments achieved, enabling highly secure multiplexed study provides competitive anti‐counterfeiting inspires development novel strategies.

Language: Английский

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