具有增强余辉发射的F和Na共掺杂碳点在指纹识别和信息加密中的应用

IF 4.3 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2025-04-17 DOI:10.1016/j.saa.2025.126259

Wei Gao , Hao Hu , Jinkun Xue , Yongrun Dong , Wen Li , Xia Zhao , Xiang Mao , Zequan Li

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引用次数: 0

摘要

碳点（cd）作为一种荧光纳米材料引起了人们极大的兴趣；然而，它们的长余辉发射特性仍未得到充分研究。在这项研究中，我们通过氟-钠（F, Na）共掺杂合成了具有室温磷光（RTP）和热激活延迟荧光（TADF）的双模余辉CDs，实现了延长的余辉寿命574 ms。在365 nm紫外光激发下，余辉发射持续14 s（肉眼观察）和40 s（仪器量化），表现出优异的时间分辨率。钠掺杂使余辉强度提高了11.3%，而氟掺杂使单重态-三重态能隙（ΔEST）减小到0.036 eV，促进了高效的反向系统间交叉并实现了TADF行为。这些协同效应使所开发的光盘成为防伪系统、多级数据加密和高安全性光学标签的有希望的候选者。

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F and Na Co-doped carbon dots with enhanced afterglow emission for applications in fingerprint recognition and information encryption

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F and Na Co-doped carbon dots with enhanced afterglow emission for applications in fingerprint recognition and information encryption

Carbon dots (CDs) have attracted considerable interest as fluorescent nanomaterials; however, their long-afterglow emission properties remain underexplored. In this study, we synthesized dual-mode afterglow CDs exhibiting room-temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) via fluorine-sodium (F, Na) co-doping, achieving an extended afterglow lifetime of 574 ms. Under 365 nm UV excitation, the afterglow emission persists for 14 s (naked-eye observation) and 40 s (instrumentally quantified), demonstrating exceptional temporal resolution. Na doping enhances afterglow intensity by 11.3 %, while fluorine doping reduces the singlet–triplet energy gap (ΔE_ST) to 0.036 eV, facilitating efficient Reverse Intersystem Crossing and enabling TADF behavior. These synergistic effects position the developed CDs as promising candidates for anti-counterfeiting systems, multilevel data encryption, and high-security optical tagging.

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来源期刊

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 物理-光谱学

CiteScore

8.40

自引率

11.40%

发文量

1364

审稿时长

40 days

期刊介绍： Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.