Abstract: Intermolecular excitation energy transfer has been investigated in the binary mixture system mediated by completely synthesized bilayer membrane containing biphenyl moiety(DBBTAB). The donor, a biphenyl group, was embeded in the interior of the bilayer membrane. The acceptor, fluorescein sodium salt, two negatively charged polar groups, was attracted electrostatically to the positively charged surface of the DBBTAB vesicles. The efficiency of the energy transfer was found to be good. Fluorescein quenched the fluorescence intensity of the biphenyl, which fitted a Stern-Volmer relationship over the concentration ranges of 0～8×10^-5 mol/L. The functionallization of the vesicles in the energy transfer was explored, and energy transfer mechanism was discussed too. Furthermore, energy transfer from the fluorescein donor to tetraphenylporphyrin sulfated sodium acceptor, was also observed in the same system. The energy transfer improved light efficiency and extended the spectral region. The experiment results imply that the DBBTAB vesicle is better media for energy transfer in dye laser and good membrane mimic agent.

Key words: Bilayer membrane, Vesicle, Fluorescence, Energy transfer, Organization