Bipolar Host Materials with Carbazole and Isoquinoline/Benzothiazole Moieties for Green Phosphorescent Organic Light-Emitting Diodes

초록

In this study, we demonstrate three bipolar host materials based on carbazole and isoquinoline/benzothiazole derivatives for use in green phosphorescent organic light-emitting diodes. Particularly, 9-[4-(isoquinolin-1-yl)phenyl]-9H-carbazole (1) exhibited good properties for use in green phosphorescent organic light-emitting diodes. A device using compound 1 as the host with the green phosphorescent dopant bis[2-(1,1',2',1 ''-terphen-3-yl)pyridinato-C, N]iridium(III)(acetylacetonate) showed the green emission with a maximum external quantum efficiency, power efficiency, and luminance efficiency of 8.1%, 26.71 lm/W, and 29.76 cd/A at 20 mA/cm(2), respectively. The Commission International de L'Eclairage (CIE) chromaticity coordinates of this device were (0.35, 0.61) at 8.0 V.

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