Efficiency and Aging Comparison Between N,N-Bis (3-methylphenyl)-N,N-diphenylbenzidine (TPD) and N,N-Di-[(1-naphthalenyl)-N,N-diphenyl]-1,1-biphenyl-4,4-diamine (NPD) Based OLED Devices

摘要

In this paper we present and discuss experimental results to evaluate performances and aging behaviour of two Hole Transporting Material (HTM), TPD and NPD, in Organic Light Emitting Device (OLED) with structure: ITO/HTM/Alq3/Al. For each of these HTMs, devices with several thicknesses have been built, to measure and emphasize behaviours of material-geometry combinations. Electro-optical properties have been measured to estimate and compare brightness, power efficiency and aging decays.