EMISSION CHARACTERISTICS OF ELECTROLUMINESCENT DEVICES USING MOLECULARLY-DOPED POLYMER-FILMS

Electroluminescent (EL) devices made of molecularly-doped polymer film s in which the component dyes and their compositions were systematical ly varied were fabricated. A diamine derivative, TPD, as a hole transp ort material and an oxadiazole derivative, END, as an electron transpo rt material were employed. A naphthostyryl derivative as an emitter ma terial with hole transport capability, a phthalolperinone derivative a s an emitter material with electron transport capability, and coumarin -6 as an emission centre were used. Three types of single-layer EL dev ices were prepared. The emission characteristics of the EL devices wit h different dye combinations and compositions were measured and compar ed. The EL efficiencies were found to be largely dependent on the dye combinations and their composition.