Abstract
Abstract New bipolar host materials with the different number of benzo[f]quinoline and carbazole groups were synthesized for green phosphorescent organic light-emitting diodes (PHOLEDs). We controlled the number of the electron transporting benzo[f]quinoline moieties and the hole transporting carbazole moieties to adjust charge balance at the emitting layer (EML) with those bipolar host materials. In addition, we found that they give relatively high triplet energy level (T1 > 2.50 eV) which is suitable for green host materials. As a result, the green PHOLEDs employing those materials together with bis(2-phenylpyridine)(acetylacetonato) iridium (III) [Ir(ppy)2(acac)] as a dopant showed moderately high current efficiency up to 42.85 cd/A.
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