Synthesis of TPD-Containing Polymer Thin Films by Physical Vapor Deposition

Abstract

Polymer thin films having tetraphenyl diaminobiphenyl (TPD) side chain were prepared by evaporating its acrylate monomer by the ionization-assisted deposition (IAD) method. IR absorption and GPC analyses showed that the electron irradiation to the evaporated material works efficiently to initiate the polymerization reaction on the substrate surface, while the simple evaporation produced films mainly consisting of the monomers. The reaction was enhanced by increasing the substrate temperature. However, the surface roughness increased with increasing substrate temperature. Post annealing can be an alternative method to enhance the polymer yield. Light emitting diodes were prepared by stacking the TPD polymer layer, Alq3 emissive layer, and Al electrode on ITO-coated glass. The IAD polymerization can be a useful method for preparing polymer thin films for organic optoelectronic devices.

Preparation of Dye-Polymer Composite Films by Deposition Polymerization

“…Although the polymerization is not still complete at I e = 10 mA, the film characteristics were largely different form the monomer film formed by the conventional evaporation, as will be shown in the following sections. Further increase of the yield can be expected by increasing I e or by heating the substrate (16) . On the other hand, the molecular weight did not have prominent dependence on I e .…”