Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 1, Pages 604-611Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c03383
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Funding
- National Natural Science Foundation of China [61922091, 91733302]
- Science and Technology Development Fund, Macau SAR [0040/2019/A1, 0073/2019/AMJ, FDCT/199/2017/A3, FDCT/013/2017/AMJ]
- University of Macau [SRG2019-00163-IAPME, CPG2020-00026-IAPME, MYRG2019-00103-IAPME]
- Ministry of Science and Higher Education of the Russian Federation [14.Y26.31.0028]
- RFBR [18-29-19122]
- Research Grant Council of Hong Kong S.A.R [CityU 11306619]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20190808181201899]
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Enhancing the absorption and emission of carbon dots in the deep-red/near-infrared range by suppressing nonradiative charge recombination via deprotonation of the CD surface allows for multilevel data encryption in the NIR region through humidity and temperature control on CD-ink stamped paper.
Carbon dots (CDs) with efficient excitation and Ion )ation emission in deep-red/near-infrared (NIR) spectral range are important for bioimaging applications. Herein, we develop a simple and effective method to significantly enhance both the absorption and emission of CDs in deep-red/NIR by suppressing nonradiative charge recombination via deprotonation of the CD surface. As compared to aqueous solutions at room temperature, NIR emission of CDs in N,N-dimethylformamide and glycerol experience a 50- and 70-fold increase at -20 degrees C, respectively, due to enhanced deprotonation ability and viscosity. On the basis of the adjustable NIR fluorescence intensity of CDs, multilevel data encryption in the NIR region is realized by controlling the humidity and the temperature of a CD-ink stamped paper.
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