Lessard Research Group - Next Generation Materials for Next Generation Applications

New Publication in Langmuir!

New Publication in Langmuir!

Crosslinking of hole-transporting polymer thin films in organic light emitting diodes (OLEDs) has been shown to increase device efficacy when subsequent layers are deposited from solution. This improvement, due to resistance of the films to dissolution, could also be achieved by covalently grafting the polymer film to the substrate. Using nitroxide mediated polymerization (NMP), we synthesized a novel poly(vinylbenzylcarbazole) (poly(VBK)) copolymer which can be crosslinked and also developed a simple method for the grafting-to or grafting-from also known as surface-initiated polymerization of poly(VBK) to indium tin oxide (ITO) substrates. All three of these methods produced thin films that could be orthogonally processed, that is they resisted dissolution when the spin-coating of a subsequent layer was simulated. Similar electrochemical behaviour for the poly(VBK) films was observed regardless of the technique used, suggesting that all 3 techniques could be used in the engineering of organic electronic devices. We expect that all three methods would be worth investigating in the solution-based assembly of OLEDs and other organic electronic devices.


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