期刊
NANOSCALE
卷 11, 期 14, 页码 6584-6590出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr09672d
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资金
- National Key Research and Development Program [2017YFB0404300, 2017YFB0404301]
- National Natural Science Foundation of China [51572232, 51561135015, 51502254, 51872247]
- Natural Science Foundation of Fujian Province [2018J01080]
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.
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