▎ 摘　　要

Non-covalent Porphyrin-Graphene Oxide (GO) donor-acceptor nanohybrids were formed effectively in water which was indicated by the red shift of the porphyrin absorption bands. The photoinduced electron transfer (PET) from cationic porphyrin to GO was proved by fluorescence spectroscopy, fluorescence decay and photoelectrochemical experiments. The fluorescence excitation, emission wavelengths, decay times and photocurrent values of the donor-accepter nanohybrids depended on two different pH (pH=2 and pH=7) of the system, which behaved as a pH regulated PET light-harvesting model driven by different excitation wavelengths. As the porphyrin-GO hybrids showed different colors with different pH (pH 2 and pH 7), a pH dependent color-changing light-harvesting model monitored by the naked eyes was proposed.