Abstract

Polydiacetylenes have large optical nonlinearities due to the extension of their π-electron wave-functions which are delocalized over many polymer repeat-units. They also exhibit sub-picosecond excited-state relaxation-times due to the efficient non-radiative decay processes which are mediated by the large electron-phonon coupling in those one-dimensional conjugated systems [1]. Some vibration modes such as the single, double and triple carbon-carbon bond-stretching ones, which are strongly coupled to the electronic excited-states, have been characterized using various resonant Raman effects [1,2]. in order to gain insight into those relaxation processes, we have performed sub-picosecond time-resolved absorption spectroscopy of the exciton bleaching of a polydiacetylene thin film.

© 1992 The Author(s)