Abstract
It is shown that SSF spectroscopy can be employed to distinguish between excitation relaxation in the course of their random walk and structural relaxation as the possible origins of the Stokes shift seen in the emission spectra of PVCA. The random walk of the excitation has consistently been analyzed in terms of the concept of diffusion and relaxation of excitations within an energetically disordered system with Gaussian distribution of hopping sites predicting a localization threshold within the tail of the DOS
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