Abstract
The photophysical properties of a series of 9,9′-dioctylfluorene copolymers containing 1,3,4-oxadiazole units (PF1Ox, PF2Ox, PF3Ox, and PF4Ox) as well as a copolymer containing 9,9-dioctylfluorene, 1,3,4-oxadiazole, and N-octylcarbazole (PFOxCz) have been characterized by fluorescence and time-resolved absorption spectroscopy. It was observed that the photophysical data of PF2Ox, PF3Ox, and PF4Ox were almost coincident (λem = 426 nm, ϕfl = 0.38) and somewhat different from those of PF1Ox (λem = 404 nm, ϕfl = 0.34) and PFOxCz (λem = 472 nm, ϕfl = 0.39). These differences are attributed to the influence of the largest Ox percentage in the polymer (PF1Ox) or to the presence of a strong electron-donor carbazole unit (PFOxCz). In transient absorption spectroscopy the presence of triplet excitons (λ = 350 and 740 nm, quenched by oxygen), positive polarons (λ = 400 and 530 nm, quenched by triethylamine), and photoeject electrons (absorption onset 800 nm, quenched by oxygen) was observed for PFnOx (n = 1, 2, 3, 4...
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