Abstract
A new hole-transporting material, 5,10,15-triphenyl-5H-diindolo[3,2-a:3′,2′-c]carbazole (TPDI) is reported for organic light-emitting device (OLED) applications. It shows excellent hole mobility (6.14×10−3cm2/Vs), one order higher than that of NPB (4,4′-bis(N-phenyl-1-naphthylamino)biphenyl), and a good HOMO level of 5.3eV. Fabricated fluorescent blue OLEDs exhibit about 1.0V voltage reduction and 18% external quantum efficiency (EQE) improvement by replacing TPDI instead of NPB as a hole transport layer. In the green phosphorescent OLEDs, the driving voltage improves about 1.8V and EQE increases about 65%. This TPDI will be applicable to not only in fluorescent OLEDs but also in phosphorescent OLEDs.
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