PHOTOCHEMICAL STUDIES OF LANGMUIR-BLODGETT-FILMS FABRICATED FROM N-ALKYLACRYLAMIDE COPOLYMERS WITH VARIOUS VINYL AROMATIC MONOMERS

Various aromatic chromophores were incorporated into polymer Langmuir-Blodgett (LB) multilayers as co-monomers of copolymers of N-alkylacrylamides (AA). The monolayer formation of the naphthalene copolymers is investigated in detail by measurement of the surface pressure-area isotherms. The fluorescence spectra for the LB multilayers were measured as functions of the deposited layer and the alkyl chain length of AA. The excimer emission intensity increased with increasing number of deposited layers when the effective intralayer and interlayer energy transfer to the excimer forming sites is taking place. The efficiency of vertical energy transfer in the Y-type LB films for naphthalene, pyrene, carbazole and fluorene chromophores was safely judged- from the increase in the excimer emission intensity as a function of the type of deposited layer in the fluorescence spectra. The limiting energy transfer distances for each chromophores are correlated with critical energy transfer distances of Forster type.