▎ 摘　　要

Herein, we scrutinize the photophysical and electronic changes on graphene quantum dots (GQDs) which occurs as a consequence of both type of covalent and non-covalent functionalization using Tetraaminophenylporphyrin (TAPP). Covalent functionalization resulted in amide bond between GQD and TAPP (GQD-CONH-TAPP), while electrostatic interactions, hydrogen bonding and pi-pi interactions together contribute to the binding in non-covalent functionalization. Outstanding difference between both of the functionalized GQDs were observed in their UV-Visible absorption spectra, photoluminescence (PL) spectra and time-correlated single photon counting (TCSPC) measurements. GQD-CONH-TAPP acts as a charge separated system having C1 point group. In case of GQD-TAPP, the non-covalent nanohybrid system, photoinduced electron transfer from TAPP to GQD occurs with a dynamic quenching constant of 21.89x10(3) M-1 and bimolecular rate constant of 2.77x10(14) M(-1)s(-1). Feasibility of this electron transfer is reinforced by the negative Delta G(PET) value and the theoretical studies.