Journal
LIGHT-SCIENCE & APPLICATIONS
Volume 4, Issue -, Pages -Publisher
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2015.137
Keywords
excitation wavelength independent; graphene quantum dots; nitrogen doped; pure color emission
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Funding
- National Natural Science Foundation of China [21301166, 21201159, 61306081, 61176016]
- Science and Technology Department of Jilin Province [20130522127JH]
- 'Hundred Talent Program' of CAS and Innovation and Entrepreneurship Program of Jilin
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry
- open research fund program of the State Key Laboratory of Luminescence and Applications
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Unlike inorganic quantum dots, fluorescent graphene quantum dots (GQDs) display excitation-dependent multiple color emission. In this study, we report N-doped GQDs (N-GQDs) with tailored single color emission by tuning pi-conjugation degree, which is comparable to the inorganic quantum dot. Starting from citric acid and diethylenetriamine, as prepared N-GQDs display blue, green, and yellow light emission by changing the reaction solvent from water, dimethylformamide (DMF), and solvent free. The X-ray photoelectron spectroscopy, ultraviolet-visible spectra results clearly show the N-GQDs with blue emission (N-GQDs-B) have relatively short effective conjugation length and more carboxyl group because H2O is a polar protic solvent, which tends to donate proton to the reagent to depress the H2O elimination reaction. On the other hand, the polar aprotic solvent (DMF) cannot donate hydrogen, the elimination of H2O is promoted and more nitrogen units enter GQD framework. With the increase of effective pi-conjugation length and N content, the emission band of N-GQDS red-shifts to green and yellow. We also demonstrate that N-GQDs could be a potential great biomarker for fluorescent bioimaging.
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