Abstract
We have investigated the effects of molecular organization in mixed Langmuir-Blodgett (LB) films of 11-(9-carbazolyl)undecanoic acid (CUA) and palmitic acid on the fluorescence characteristics of these films. The fluorescence from carbazolyl chromophores was quenched rapidly at the initial stage of irradiation of the LB films in air or in argon while little or no changes in the absorption spectra were observed. No fluorescence quenching was observed for CUA in irradiated solutions or in LB films stored in the dark. The extent of the fluorescence quenching depended on the temperature, atmosphere type, irradiation time, and the mole fraction of CUA in the mixed LB films. Such amplified fluorescence quenching was attributed to efficient energy transfer by exciton hopping among carbazolyl chromophores inhomogeneously aggregated and distributed in the LB films to a trace amount of non-radiative sites formed by photooxidation or changes in the molecular interaction of the carbazolyl chromophores.
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