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J-aggregates of thiacyanine dye organized in LB films: effect of irradiation of light
- Source :
- Journal of Luminescence Volume 131, Issue 8, August 2011, Pages 1655-1660
- Publication Year :
- 2011
-
Abstract
- 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).<br />Comment: 12 pages, 5 figures, 1 table
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- Journal of Luminescence Volume 131, Issue 8, August 2011, Pages 1655-1660
- Publication Type :
- Report
- Accession number :
- edsarx.1106.3659
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.jlumin.2011.04.003