THIACARBOCYANINE DYE J-AGGREGATES AS AN EXAMPLE OF RESTRICTED MOLECULAR-SYSTEM

The results of a study of exciton dynamics of thiacarbocyanine derivat ive J-aggregates in glassy matrices at low temperatures are reported. Temperature dependences of fluorescence spectra and homogeneous absorp tion linewidth have been experimentally investigated. Spectral hole bu rning experiments show the homogeneous linewidth to be independent of temperature at T < 9 K being as large as 1.7 cm(-1) corresponding to t he dephasing time, 6.2 ps. The results are discussed in a framework of exciton-phonon scattering process. Temperature dependence of coherent length of exciton is considered on the base of fluorescence spectral data.