期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/srep24850
关键词
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资金
- National Science Foundation of China [11274149, 91436102, 11374353, 11544015]
- Program of Liaoning Key Laboratory of Semiconductor Light Emitting and Photocatalytic Materials
The optical properties of graphene quantum dots (GQDs) were investigated theoretically. We focused on the photoinduced charge transfer and electron-hole coherence of single-layer graphene in the electronic transitions in the visible regions. Surface functionalization with donor or acceptor groups produced a red shift in the absorption spectrum, and electrons and holes were highly delocalized. The recombination of excited, well-separated electron-hole (e-h) pairs can result in enhanced fluorescence. This fluorescence enhancement by surface functionalization occurs because of the decreased symmetry of the graphene resulting from the roughened structure of the surface-functionalized GQDs.
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