Ultraviolet photoelectron spectroscopic study of heterocyclic model compounds for electroluminescent devices

One approach to increase the overall performance of organic light emitting devices is to separate the light-emitting volume from the ones which are assigned to charge injection or transport. The electronic properties of model heterocyclic compounds, namely low molecular phenylquinoxalines and related derivatives, for electron transport layers have been investigated by Ultraviolet Photoelectron Spectroscopy. The ionization potentials of these materials have been determined.