Optical properties and morphology of thin diindenoperylene films

Thin films of diindenoperylene deposited on weakly interacting substrates (quartz) are characterized with scanning probe microscopy techniques at room temperature and by pico-second time-resolved fluorescence spectroscopy between 5 and 300K. Pronounced T-dependencies of fluorescence spectra and decays are found. The interplay between two fluorescence series in a narrow temperature range (80K less than or equal to T less than or equal to 100K) has been spectrally and temporally resolved. The possible origin of the observed series, competing energy transfer and quenching processes is discussed. (C) 2004 Elsevier B.V. All rights reserved.