Abstract
Electrophosphorescent organic light-emitting diodes (PHOLEDs) with alternate multilayer structures, which consist of N, N′-bis-(1-naphthyl)-N, N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) and 5,6,11,12-tetraphenylnaphthacene (rubrene) as hole-transporting layers have been fabricated. The effect of the alternate multilayer structures upon ther performance of PHOLEDs with fac-tris(2-phenylpyridine)iridium (Ir(ppy)3) doped into 4,4′-N, N′-dicarbazole-biphenyl (CBP) as the emitting layer has been investigated. Compared with the conventional diode only with NPB as hole-transporting layer, high efficiency and long lifetime diodes have been obtained with the alternate structures. Such an improvement in the device performance was attributed to the improved hole-electron balance, which can be further attributed to the introduction of the alternate multilayer structure into PHOLEDs.
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