Abstract
This contribution reports on detailed photophysical investigations of poly( p-phenylene) PPP and poly( p-phenylene-vinylene) (PPV) derivatives laterally decorated with polystyrene ( PPV-PSt) or poly(ε-caprolactone) ( PPP-PCL, PPP- alt PCL, PPV-PCL and PPV-PCL-Br). The polymers emit blue and exhibit very high relative and absolute photoluminescence quantum yield, Φ f, in dilute solution, thin film (spin-coated and inkjet-printed) and bulk state. This is ascribed to the presence of the lateral macromolecules, which suppress the strong π–π interactions and consequently excimers formation. Lower Φ f value was obtained for the bromine containing polymer and its corresponding model compound dibromodistyrylbenzene Br 2-DSB , which was ascribed to heavy atom effect enabling intersystem crossing from S 1 to T 1. However, studies at 77 K did not reveal phosphorescence, in contrast an enhancement of the fluorescence intensity with respect to room temperature measurement was observed.
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