Abstract
9-(Pyridin-3-yl)-9H-carbazole (PyCz) derivatives were synthesized as bipolar host materials for green phosphorescent organic light-emitting diodes (PHOLEDs) and the device performance was investigated. The PyCz core was modified with carbazole and diphenylamine to prepare the bipolar host materials. Bipolar charge transport properties were observed in the PyCz derivative with the carbazole unit and a high quantum efficiency of 21.3% was obtained in green PHOLEDs.
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