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Updated: May 20, 2025
Author Spotlight: Advancing SERS Technology: Au@Carbon Dot Nanoprobes for Label-Free Analysis and Imaging
Published on: June 9, 2023
F and Na Co-doped carbon dots with enhanced afterglow emission for applications in fingerprint recognition and
Wei Gao1, Hao Hu2, Jinkun Xue2
1School of Resources, Environment and Materials, Guangxi University, Nanning 530004 Guangxi, China; Guangxi Engineering and Technology Research Center for High Quality Structural Panels from Biomass Wastes, Nanning 530004 Guangxi, China; State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning 530004, China; Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004 Guangxi, China; Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004 Guangxi, China.
Abstract:
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 (ΔEST) 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.
