Organic electroluminescent (EL) behaviors were investigated with epita
xially oriented and disordered polycrystalline films of emissive p-sex
iphenyl (6P) molecules, In comparison to the disordered polycrystallin
e 6P film, the epitaxial 6P film in which the molecular axis possessed
lying orientation remarkably exhibited a high EL intensity at lower d
riving voltages, whereas the epitaxial 6P film with standing orientati
on emitted a weak intensity even at higher voltages. (C) 1997 Elsevier
Science S.A.