Investigation of organic light emitting devices using boron-doped diamond electrodes

Organic light emitting devices with diamond electrodes have been investigated by scanning electron microscopy in conjunction with light emission spectra. The diamond films were prepared by hot filament chemical vapor deposition. Heavily boron-doped diamond films were achieved by introducing trimethylborate during diamond growth process. The light emitting layers consist of ladder-type poly (p-phenylene) with hole transport properties and tris-(8-hydroxyquinoline) aluminum as the electron transport material. The experimental studies show that the stability of the organic light emitting devices with diamond electrodes is greatly improved in comparison with devices using metal electrodes.