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Here we report a detailed study of organic light-emitting diodes based on poly(9,9-dioctylfluorene) (PFO), to investigate polaron generation, due to field induced singlet dissociation, and their subsequent recombination. We find that initially free polarons coalesce into intermediate pairs of both singlets and triplets multiplicity which subsequently decay into the neutral state. There is indication...
The diffusion coefficients, D, of oxygen in titaniumoxo phthalocyanine (TiOPc) films are determined by following the increase of electric photoconductivity of the films upon oxygen sorption. The diffusion coefficient in as-deposited films of unsubstituted TiOPc is D~8x10 -16 cm 2 s -1 . Introduction of alkyl spacers leads to the increase of D by an order of magnitude...
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