Theoretical Investigations of Optical Origins of Fluorescent Graphene Quantum Dots.
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.
Department of Chemistry and Department of Physics, Liaoning University, Shenyang 110036, PR China.|Beijing National Laboratory for Condensed Matter Physics, Beijing Key Laboratory for Nanomaterials and Nanodevices, Institute of Physics, Chinese Academy of Science, Beijing, 100190, P. R. China.|Department of Physics, Shenyang Aerospace University, 110036, PR China.
Jingang
J
Wang
Department of Chemistry and Department of Physics, Liaoning University, Shenyang 110036, PR China.
Shuo
S
Cao
Department of Chemistry and Department of Physics, Liaoning University, Shenyang 110036, PR China.
Yong
Y
Ding
Department of Chemistry and Department of Physics, Liaoning University, Shenyang 110036, PR China.
Fengcai
F
Ma
Beijing National Laboratory for Condensed Matter Physics, Beijing Key Laboratory for Nanomaterials and Nanodevices, Institute of Physics, Chinese Academy of Science, Beijing, 100190, P. R. China.
Wengang
W
Lu
Department of Chemistry and Department of Physics, Liaoning University, Shenyang 110036, PR China.|Beijing National Laboratory for Condensed Matter Physics, Beijing Key Laboratory for Nanomaterials and Nanodevices, Institute of Physics, Chinese Academy of Science, Beijing, 100190, P. R. China.
Mengtao
M
Sun