AGGREGATION INDUCED REABSORPTION OF 3-(2-BENZOTHIAZOLYL)-7-OCTADECYLOXY COUMARIN MOLECULES ASSEMBLED IN LANGMUIR-BLODGETT-FILMS - A FLUORESCENCE STUDY

3-(2-Bezothiazolyl)-7-octadecyloxy Coumarin (BOC) is an amphiphilic de rivative of coumarin 6, a laser dye which forms excellent floating lay ers at the air-water interface. Highly fluorescent Langmuir-Blodgett ( LB) films have been obtained on quartz substrates. A comparitive study of the absorption, emission and excitation spectra of BOC in solution and in LB films at room temperature and at 77K have been made. The ex perimental results suggest that at room temperature the films are amor phous but at low temperature the films are microcrystalline.