Abstract
Low-temperature site-selective fluorescence spectroscopy was performed on PDBG present either as solid film or dissolved in a MTHF glass. The spectra are discussed in terms of spectral diffusion of singlet excitations within two different density-of-states (DOS) distributions. The higher-energy DOS derives from disordered chain segments that are subject to structural relaxation after excitation, while the lower-energy DOS is related to rigid ordered chain segments differing in length. The analogy with charge transport is pointed out.
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