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Light‐Induced Structural Changes of J‐Aggregates of Organic Dyes at Low Temperature
Author(s) -
Lindrum M.,
Daehne S.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221890106
Subject(s) - absorption (acoustics) , wavelength , aggregate (composite) , irradiation , absorption band , blueshift , absorption spectroscopy , spectral line , j aggregate , photochemistry , spectral properties , red shift , materials science , laser , chemistry , optics , chemical physics , analytical chemistry (journal) , optoelectronics , nanotechnology , molecule , photoluminescence , physics , chromatography , computational chemistry , astrophysics , organic chemistry , astronomy , nuclear physics , composite material , galaxy
Narrow‐band laser irradiation of the J‐aggregate of a tetrachlorobenzimidocarbocyanine dye at low temperature leads to drastic changes of the absorption profile. ΔOD spectra consist of broad features with both decrease (“hole”) and increase (“antihole”) of absorption where the latter appears exclusively blue‐shifted with respect to the hole. Further irradiation at shorter wavelengths shifts the absorption successively to the blue. The mechanism of the observed spectral changes is assumed to be due to specific structural changes in the J‐aggregate: aggregate states which absorb at longer wavelengths are unstable and can be transformed to more stable ones.