Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/2388
Title: Polarized absorption spectra of highly oriented two-dimensional aggregates of tetrachlorobenzimidazolocarbocyanine in thin films
Authors: Özçelik, Serdar
Gülen, Demet
Keywords: Dyes
Cyanines
Frenkel exciton
Herringbone arrangement
J-aggregates
Vertical spin coating
Issue Date: May-2008
Publisher: Elsevier Ltd.
Source: Özçelik, S., and Gülen, D. (2008). Polarized absorption spectra of highly oriented two-dimensional aggregates of tetrachlorobenzimidazolocarbocyanine in thin films. Journal of Luminescence, 128(5-6), 871-873. doi:10.1016/j.jlumin.2007.11.023
Abstract: Reaching a control on the mesoscopic morphology and internal molecular arrangement of cyanine aggregates is an important step for realization of devices with tailor-made optical properties. Despite a wealth of research, understanding of the relationship between molecular organization, excitonic states and dynamics of aggregates is still preliminary. To this end, we have employed polarized absorption spectroscopy to investigate the relationship between internal molecular organization and excitonic states of J-aggregates in 1,1′,3,3′tetraethyl-5,5′,6,6′-tetrachlorobenzimidazolocarbocyanine (TTBC) thin films in poly-vinyl alcohol (PVA). Angular dependence of the UV-vis spectra has been measured at 11 different orientations between the electric field polarization and the macroscopic alignment axis. Aggregate spectral response consisted of an asymmetrically split Davydov pair of bands exhibiting opposite polarization: an H-band (505 nm, Lorentzian-like, polarized along the macroscopic film axis) and a J-band (594 nm, one-dimensional J-aggregate like band shape, polarized perpendicular to the macroscopic film axis). The polarized absorption observations were found to be consistent with a herringbone model for which the internal molecular arrangement, the excited state structure and dynamics have recently been detailed by us upon interpretation of isotropic absorption data in ionic aqueous solution.
Description: Proceedings of the 16th International Conference on Dynamical Processes in Excited States of Solids
URI: http://doi.org/10.1016/j.jlumin.2007.11.023
http://hdl.handle.net/11147/2388
ISSN: 0022-2313
0022-2313
Appears in Collections:Chemistry / Kimya
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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