Organic electroluminescent devices using deposited poly(p-phenylene) film as hole transport layer

We have fabricated organic electroluminescent devices with poly ( p -phenylene) as a hole-transporting layer, and with tris (8-hydroxy-quinoline) aluminum as an emitting layer by vacuum deposition. As a result, it is found that the deposited PPP film is an effective film as a hole transport layer, and that the characteristic of these devices changes remarkably with substrate temperature at vacuum deposition.