Abstract
In this work, two host materials, namely DAMP and DCMP were designed and synthesized based on 4,5-dimethylpyridazine and triphenylamine or carbazole. These two compounds exhibit good thermal stability, suitable highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels and balanced carrier transport properties. Green phosphorescent organic light-emitting devices (PhOLEDs) based on DAMP and DCMP exhibit excellent performance with the maximum external quantum efficiencies (EQEs) of 19.5% and 22.2%, respectively. At the luminance of 1000 cd/m2, the EQE of the device based on DCMP can still reach to 21.4%. Besides, red PhOLEDs hosted by DAMP and DCMP also showed satisfied performance, with the maximum EQE of 15.3% and 20.0%, respectively. These results suggest that DAMP and DCMP are promising host materials for green and red PhOLEDs.
Published Version
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