%0 Journal Article %A Chi Man Luk and Ming Kiu Tsang and Chi Fan Chan and Shu Ping Lau %D 2014 %J International Journal of Nuclear and Quantum Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 96, 2014 %T Two-Photon Fluorescence in N-Doped Graphene Quantum Dots %U https://publications.waset.org/pdf/10000013 %V 96 %X Nitrogen-doped graphene quantum dots (N-GQDs) were fabricated by microwave-assisted hydrothermal technique. The optical properties of the N-GQDs were studied. The luminescence of the N-GQDs can be tuned by varying the excitation wavelength. Furthermore, two-photon luminescence of the N-GQDs excited by near-infrared laser can be obtained. It is shown that N-doping play a key role on two-photon luminescence. The N-GQDs are expected to find application in biological applications including bioimaging and sensing. %P 1387 - 1390