Plasma Polymerization for the Deposition of an Electroluminescent Polymer Layer

Radio frequency plasma polymerization is introduced to fabricate an emissive polymer layer as an organic electroluminescence (EL) device. Utilizing this technique, a thin polymer film is deposited directly onto a substrate from a starting monomer, and the thin polymer film obtained was found to be uniform and smooth. By employing a cell of ITO(indium-tin oxide coated glass)/plasma polymerized naphthalene/Al configuration, a stable and uniform blue-green (centers at 485 nm) EL is observed over 6 V DC bias. The external quantum efficiency of this device is estimated to be about 0.01%, which is comparable with those of the single-layer polymer EL cells in which the emitting polymers are synthesized by chemical polymerization.