ENERGY-TRANSFER BETWEEN ANTHRACENE CHROMOPHORE AND SEXITHIOPHENE IN LANGMUIR-BLODGETT ASSEMBLIES

Excellent Langmuir-Blodgett (LB) films of 9,10-diphenylanthracene (DPA ) and alpha,alpha-linked sexithiophene (6T) with arachidic acid (AA) c an be formed on water subphase and can be transferred on to quartz sub strates. Electronic absorption and emission spectra of these films hav e been studied and compared with those in solution. Results suggest fo rmation of aggregates of DPA and 6T in LB films. 6T has been used as a quencher for the DPA donor fluorescence. It is shown that the efficie ncy of energy transfer from the donor to the acceptor decreases with t he quadratic power of the distance separating them. Such quadratic dep endence confirms that the donor excitation is delocalized.