Abstract
A new oligomer having fluorenylene and quinolinylene groups was straightforwardly synthesized by Suzuki reaction and proven to be readily soluble in common organic solvents. The chemical structure of the copolymer was confirmed and characterized by 1H nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and gel permeation chromatography (GPC) measurements. In solution, the oligomer presented two absorption maxima at 314 and 245 nm, along with a high fluorescence quantum yield (82%), characterized by an emission maximum at 419 nm. The band gap of the material was estimated to be around 2.60 eV by cyclic voltammetry, however the optical band gap for the thin film observed by UV-Vis spectroscopy was 3.10 eV. The divergence was attributed to charge transfer interactions due to the presence of donor and acceptor units in the copolymer.
Highlights
Since the discovery of electroluminescence (EL) in conjugated polymers, reported for poly(p-phenylene vinylene) (PPV) in 1990,1 much effort has been done aiming the construction of polymeric light-emitting devices (PLEDs)
It is well known that the performance of PLEDs is still limited by the number of electron/hole recombinations that is influenced by the number and the mobility of the charge carriers in the given constitutive layer of the device and, dictates the optimum applied voltage and the lifetime of the devices.[4]
The molar mass value (MW), 2780 g mol-1, determined by gel permeation chromatography (GPC), with a polydispersity of 1.89, indicates that just oligomeric structure was obtained. This result can be explained by the presence of bulky groups, substituted quinoline and fluorene units, leading to steric hindrance and difficulty in the C–C bond formation
Summary
Since the discovery of electroluminescence (EL) in conjugated polymers, reported for poly(p-phenylene vinylene) (PPV) in 1990,1 much effort has been done aiming the construction of polymeric light-emitting devices (PLEDs).
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