Spectral properties of naphthalimide dyes mixed with 4-heptyl-4’-cyanobiphenyl (7CB) in Langmuir-Blodgett films

摘要

LangmuirBlodgett (LB) films formed of some fluorescent dyes, namely derivatives of 4aminonaphthalimide, and their binary mixtures with the liquid crystal 4heptyl4’cyanobiphenyl (7CB) have been studied. The electronic absorption and fluorescence spectra were recorded. On the basis of these spectra, the spectral properties of the dyes and the intermolecular interactions in ultrathin ordered films were determined. The conclusions about the tendency to the creation of aggregates by dye molecules in LB films have been drawn. The measurements of absorption by using linearly polarised light have allowed us to determine the arrangement of the dye and liquid crystal molecules on the airsolid substrate interface.