LITHIUM-ALUMINUM CONTACTS FOR ORGANIC LIGHT-EMITTING DEVICES

Organic light-emitting devices have been prepared with multilayer Al-L i-Al cathodes in an ultrahigh vacuum molecular beam deposition system. The optimum device characteristics are obtained when there is a singl e Al layer separating the Li layer from the organic materials. Ab init io molecular dynamics calculations of the AI-LI interaction clarify th e role of Al as a blocking layer to Li diffusion into the organic film s as well as the behavior of the device when the thickness of this Al interfacial layer is changed. (C) 1997 American Institute of Physics.