title: Photophysical property and photostability of J-aggregate thin films of thiacyanine dyes prepared by the spin-coating method.
abstract: By use of electrostatic interactions of dye molecules and poly(diallyldimethylammonium chloride) (PDDA), the spin-coating technique has been successfully applied to the preparation of stable J-aggregate thin films of thiacarbocyanine dyes on a polycarbonate or quartz plate. The J-aggregate thin films were prepared by the spin-coating of PDDA aqueous solution on dye thin films prepared on a substrate by the spin-coating of 2,2,3,3-tetrafluoro-1-propanol solution of dyes. Photophysical properties of the dye thin films and J-aggregate thin films were studied by measuring the fluorescence spectra, quantum yields, and lifetimes. Coherent size of the J-aggregates was estimated to be 3-12 by means of the absorption bandwidth (full width at half maximum) or radiative lifetime. Photostability of the J-aggregate thin films was also studied in terms of photodegradation efficiency under argon and oxygen in comparison with the dye thin films, and J-aggregate thin films were found to be more stable than the corresponding dye thin films.
authors.affiliation: Department of Chemistry and Chemical Biology, Graduate School of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan.
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Tani
authors.forename: Chizuru
authors.initials: C
authors.lastname: Ito
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Hanawa
authors.forename: Mamoru
authors.initials: M
authors.lastname: Uchida
authors.forename: Kunihiko
authors.initials: K
authors.lastname: Otaguro
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Horiuchi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hiratsuka