Photophysical Behaviors of J-Aggregates of Merocyanine in Langmuir-Blodgett Films
- 1 January 1990
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics
- Vol. 183 (1) , 345-360
- https://doi.org/10.1080/15421409008047473
Abstract
J-Aggregates of a long-chain merocyanine can be formed in the mixed monolayers with glycerol derivatives, phospholipids and cholesterol. Its morphologies observed by a fluorescence microscopy are dependent on the matrix agents and the compositions. The photoactive J-aggregates in LB films were characterized by the weak exciton-phonon coupling and the fluorescence occured by a radiative annihilation from the free exciton state. From measurements of the fluorescence decay curves for a single layer of the J-aggregates, the lifetine has been found to be 5–11 ps irrespective of the matrix agents. In the LB systems containing the J-aggregate as a donor combined with long-chain bipyridinium as an acceptor at a distance of 20.2–30.2 A, it has been found that the fluorescence decays more rapidly.Keywords
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