Fluorine-free, highly efficient, blue-green and sky-blue-emitting cationic iridium complexes were developed, which showed high performances in organic light-emitting diodes.
An electron-transporting counter-anion, OXD-7-SO, was developed for a blue-green-emitting cationic iridium complex, which showed superior device performance in solution-processed phosphorescent light-emitting diodes over its counterpart complex with a PF counter-anion, due to the facilitated electron-injection/transport and more balanced carrier recombination imparted by OXD-7-SO.
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