[Time-resolved fluorescence investigations of aggregation in Langmuir-Blodgett multilayers of hemicyanine dye].
UV-visible absorption and steady-state and time-resolved fluorescence techniques were used to investigate the aggregation behavior in Y-type hemicyanine Langmuir-Blodgett (LB) multilayers. Hemicyanine molecules formed H aggregates in LB films leading to blue-shifts of the absorption and fluorescence bands with respect to those of monomeric hemicyanine in chloroform solutions. The aggregates in LB films were dissociated by mixing with arachidic acid. The measurement of fluorescence decay profiles could be used to quantitatively characterize the lifetime, weights and size of aggregates.
Han
K
K
State Key Joint Lab. for Materials Modification by Laser, Ion and Electron Beams, Department of Physics, Fudan University, 200433 Shanghai.
Lu
X
X
Xu
J
J
Ma
S
S
Wang
W
W
Cai
Z
Z
Zhou
J
J