论文部分内容阅读
Poor solid-state photoluminescence (PL) efficiency ((Φ)PL) has been a long-lasting obstacle for obtaining highly efficient and stable poly(phenylene vinylene) (PPV) based polymer light emitting diodes (PLEDs).In this talk,the synthesis,characterizations,and nanofabrication of a series of highly emissive Poly (2,3-diphenyl-1,4-phenylene vinylene) (DP-PPV) derivatives will be discussed.Our systematic photophysical and solid-state structural characterizations of novel DP-PPV derivatives bearing Percec-type dendritic side chains demonstrated the first example of DP-PPV derivative with high (Φ)PL (71%) even in an ordered solid-state structure,and shows that the (Φ)PL of DP-PPVs can be effectively preserved at solid state as long as the intermolecular π-π stacking is disturbed.In addition,to enhance (Φ)PL and generate ordered conjugated polymer nanoarrays,a simple approach through a pore-filling process for nanoporous polymer templates was investigated.Polarized PL spectroscopy and grazing incidence Fourier transform infrared spectroscopy indicated that the chain orientation of templated conjugated polymer chains are aligned along the cylindrical direction of nanopores.The induced alignment of the polymer chains is attributed to a nanoscale spatial effect that increases the PL intensity and the lifetime of the conjugated polymer.The enhanced luminescence of nanostructured conjugated polymers is highly promising in designing luminescent nanodevices.