The interlayer excitation energy transfer between 11-(9-carbazole)undecanoic acid (11-CU) and two
9-anthroyloxy derivatives, 9-(9-anthroyloxy)stearic acid (9-AS) and 2-(9-anthroyloxy)stearic acid (2-AS), in
alternating multilayer Langmuir−Blodgett films has been studied. The 11-CU fluorescence is quenched by
energy transfer to 9-AS or 2-AS as judged by steady-state and picosecond time-resolved fluorescence
measurements. The fluorescence decay curves of 11-CU in the films were analyzed in the framework of
several models: (1) a general model for interlayer energy transfer, (2) a two-exponential decay, (3) a Förster
model for energy transfer in a two-dimensional system, and (4) a stretched-exponential decay, characteristic
of Förster energy transfer in self-similar fractal-like structures. The recovered decay parameters suggest an
inhomogeneous mixing of the acceptor molecules in LB films leading to a two-phase system. The phase
separation during compression of the acceptor monolayers forms regions of acceptor concentration about 3
times that of the intended and regions with very low acceptor concentration.
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