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Poly(N-vinylcarbazole) undergoes cross-linking to highly solvent-resistant films through an oxidative coupling reaction, for which an annealing process takes only 3 minutes at 110 °C. This reaction allows for constructing a solution-processed multilayer OLED without a time-consuming annealing process. The maximum external quantum efficiency reaches 18%, which remains 17%, even at a high brightness of 10 000 cd m−2 for all-solution-processed blue OLEDs.
