Density of states of ensembles of conjugated molecules deduced from the photobleaching and absorption spectra

In this contribution a consistent interpretation of both the absorption spectra and the photobleaching spectra of different conjugated molecules is presented . Based on this quantitative analysis it is possible to show how the photobleaching spectra can be used as a direct tool to probe the density of states in a conjugated material. Furthermore, this quantitative analysis can also explain the behavior of the observed photobleaching signal if external parameters such as pressure or modulation frequency and intensity of the exciting light source are varied.