Synthesis of oligomers having a pendant dithienosilole unit and their applications to EL device materials

Oligomers bearing dithienosilole as a pendent were prepared by radical polymerization of the corresponding dithienosilole monomer using AIBN as an initiator. The resulting oligomers exhibited high solubility in common organic solvents and strong photofluorescences (Φ = 0.72–0.76) in THF which are a little higher than that of monomeric dithienosilole DTS(TMS)2. Applications of the oligomers to EL devices as hole transporting materials were examined and the maximum electroluminance of 2140 cd/m2 was obtained from a device composed of ITO/oligomer/Alq3/Mg–Ag.