Site-selective fluorescence spectroscopy in dye-doped polymers. II. Determination of the weighted density of states of the vibrational modes.

Abstract

The density of states of vibrational modes weighted by the coupling strength between the guest molecule and the host polymer has been obtained in dye-doped polymer films by solving an integral equation numerically using experimentally determined single-site fluorescence spectra at 4 K. The temperature dependence of the laser-induced fluorescence spectrum has been found to be reproduced by a simulation based on the linear electron-phonon coupling theory using the determined weighted density of ``phonon'' states. This result supports the validity of our procedures of experiment and analysis. The spectral profiles of the obtained weighted density of states of the vibrational modes will be discussed.