Highly Efficient Red Phosphorescent Dopants in Organic Light-Emitting Devices



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Highly efficient red phosphorescentdopants in organic light-emitting devices have been explored by using a cyclometalated iridium complex with a fully methylated phenyl ring and a quinoline ring as well as a sterically crowded ancillary ligand. The red phosphorescent devices with these dopants give extremely high external quantum efficiencies.