Organic electroluminescent device with epitaxial p-sexiphenyl films

Organic electroluminescent (EL) behaviors were investigated with epitaxially oriented and disordered polycrystalline films of emissive p-sexiphenyl (6P) molecules. In comparison to the disordered polycrystalline 6P film, the epitaxial 6P film in which the molecular axis possessed lying orientation remarkably exhibited a high EL intensity at lower driving voltages, whereas the epitaxial 6P film with standing orientation emitted a weak intensity even at higher voltages.