Zinc-porphyrin-oligothiophene-fullerene triad, where diethynylthieno[3,4-d]imidazolium is incorporated as a central unit of oligothiophene, has been synthesized. A dramatic enhancement of fluorescence from the zinc-porphyrin unit was observed on displacing counter anion from I- to F- in the imidazolium salt, indicating that photoinduced intramolecular electron transfer is controllable by the electronic perturbation to this unit.