An X-ray photoelectron spectroscopy study of the interface formed between ITO and 4,4′-bis(4-dimethyl amino styryl)benzene based light emitting diode

In organic light emitting diodes (OLEDs), the structures of the metal-organic and organic-metal interfaces are crucial for their performance such as stability. quantum efficiency. In this paper, we analysed the 4,4'-bis(4-dimethyl amino styryl)benzene (DMASB)-indium tin oxide (ITO) interface by X-ray photoelectron spectroscopy (XPS). The DMASB is a new organic material containing amino groups and is expected to have hi-h electroluminescent efficiency. The results showed a diffusion of indium and oxygen atoms into the organic layer, which induced the formation of metal-oxygen-carbon complex. The modification of the N 1s spectra suggested that formation of indium nitride would occur at the interface region. This formation already encountered may be favoured by the amino groups of the DMASB. (C) 2003 Elsevier Science B.V All rights reserved.