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Blue, green, and red full-color ultralong afterglow in nitrogen-doped carbon dots

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Abstract

Carbon dots (CDs) with tunable emission colors and multiple emission modes are highly desirable in advanced optical anti-counterfeiting. Some pioneering efforts to trigger additional long-lived emission modes, nevertheless, did not perfectly solve the issue of printability and color-tunability in practical applications. Herein, we developed an encapsulating-dissolving-recrystallization route for the synthesis of CD-based anti-counterfeiting inks, and accordingly realized blue, green, and red full-color afterglow emissions from these CD-based inks when printed on paper. The printed inks simultaneously possessed triple emission modes including fluorescence (FL), delayed fluorescence (DF), and room-temperature phosphorescence (RTP), among which the long-lived emissions (DF and RTP) could be selectively activated by using different excitation wavelengths. We believe that the proposed synthetic route in this work may promote the development of multicolor-encoded and multiple-mode-integrated optical anti-counterfeiting systems, and will expand the application of CD-based materials to the fields of sensing, photodynamic therapy and bio-imaging.

Graphical abstract: Blue, green, and red full-color ultralong afterglow in nitrogen-doped carbon dots

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Publication details

The article was received on 30 Nov 2018, accepted on 19 Dec 2018 and first published on 19 Dec 2018


Article type: Paper
DOI: 10.1039/C8NR09672D
Citation: Nanoscale, 2019, Advance Article
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    Blue, green, and red full-color ultralong afterglow in nitrogen-doped carbon dots

    C. Lin, Y. Zhuang, W. Li, T. Zhou and R. Xie, Nanoscale, 2019, Advance Article , DOI: 10.1039/C8NR09672D

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