Physics – Condensed Matter – Materials Science
Scientific paper
2011-06-18
Journal of Luminescence Volume 131, Issue 8, August 2011, Pages 1655-1660
Physics
Condensed Matter
Materials Science
12 pages, 5 figures, 1 table
Scientific paper
10.1016/j.jlumin.2011.04.003
In the present communication we report the preparation and characterizations of Langmuir and Langmuir-Blodgett films of a thiacyanine dye-dioctadecyl thiacyanine perchlorate (NK) mixed with Octadecyl trimethyl ammonium bromide (OTAB). The relationship between the molar ratio of OTAB and NK and the orientation of molecules at the air-water interface was investigated using surface pressure - area per molecule ({\pi}-A) isotherm. UV-Vis absorption and fluorescence spectroscopic investigations reveal that prominent J-aggregation of NK molecule was observed in the LB films lifted at higher surface pressure. This J-aggregation can be controlled by diluting the NK molecules with OTAB. It was observed that the J-aggregates of NK decayed to monomer and H-aggregates when the NK-LB film was exposed to a monochromatic light of wavelength 460 nm (Lambda max of J - aggregates).
Bhattacharjee Debajyoti
Chakraborty Subhasish
Dey Debadeepta
Hussain Syed Arshad
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