Abstract
We investigated the charge generation characteristics of intermediate layer, consisting of an organic acceptor material 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HAT-CN 6) and an organic donor material N, N′-di(naphthalene-1-yl)- N, N′-diphenylbenzidine (NPD), for a stacked organic light-emitting device (OLED). A stack consisting of an ultra-thin 1 nm of LiF and of Al was used as an electron-injection layer (EIL) from HAT-CN 6 to an adjacent electron transporting layer (ETL). The orange-emitting fluorescent stacked OLED with the charge generation layer and the electron injection layer exhibited twice higher current efficiencies and a longer operational lifetime than those of the corresponding unstacked device under a high luminance. We also fabricated a green phosphorescent OLED showing an extremely high current efficiency of 256 cd/A.
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