Böhm, E.E.BöhmPflumm, C.C.PflummVoges, F.F.VogesFlämmich, M.M.FlämmichHeil, H.H.HeilBusing, A.A.BusingParham, A.A.ParhamFortte, R.R.FortteMujica, T.T.Mujica2022-03-112022-03-112009https://publica.fraunhofer.de/handle/publica/365798We show that efficiency, voltage and lifetime cannot be optimized simultaneously in blue fluorescent OLEDs. With novel ETMs, any desired trade-off In performance can be obtained. In an optimized system, 8.5% EQE were achieved. With thick ETLs, we obtain low driving voltage and improved color purity in green phosphorescent OLEDs.en620conference paper