ORGANIC ELECTROLUMINESCENCE DEVICES FABRICATED WITH CHEMICAL-VAPOR-DEPOSITED POLYAZOMETHINE FILMS

We demonstrate the use of chemical vapour deposition polymerization as an effective method to fabricate conjugated polymer films as constitu ents in organic electroluminescence (EL) devices. This technique provi des excellent compatibility with vacuum sublimation deposition of low molecular weight materials for construction of hybrid devices. The spe cific polyazomethine polymer studied here, namely, thyridynenitrilo-1, 4-phenylenenitrilomethylidyne), is shown to be an addition to the rang e of polymer structures that provide electron transport functionality and, in combination with suitable emissive materials, provides the bas is for new device structures. From measurements on a series of devices we propose an energy level structure for this material. Despite remai ning isoelectronic with poly(1,4-phenylenevinylene) the energy levels of the polyazomethine are strongly shifted through the replacement of a vinylene CH with a N atom.