Abstract
Site-selected fluorescence spectra have been measured for Mg-octaethylporphyrin doped in polystyrene and PMMA films at low temperatures by a time-correlated single-photon counting method under CW mode-locked dye-laser excitation into the lowest optical absorption band. A narrow resonance line accompanied by a broad sideband has been observed by rejecting the scattered laser light using a time gate. A single-site fluorescence spectrum has been obtained by the use of saturation effect of the laser-induced fluorescence. The density of phonon states weighted by the electron-phonon coupling coefficient has been determined, for the first time for a dye-polymer system, from the analysis of the obtained spectrum. Temperature dependence of the laser-induced fluorescence spectrum is compared with the simulation based on the weighted phonon-state density.
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