Electroluminescence of mixed organic dyes via resonant energy transfer from polysilane molecules

We have observed an electroluminescence (EL) of perylene (blue), coumarin 6 (green), 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran and/or zinc tetra-phenylporphyrin (red) via an efficient intermolecular energy transfer from poly (m-hexoxyphenyl)phenylsilane (PHPPS). The EL device has a single layer which was prepared simply by spin coating the mixed solution of PHPPS and energy-matched dye molecules. The EL spectrum can easily be tailored by intermixing appropriate dye molecules in the solution. We demonstrated a white EL from the mixture of PHPPS and these four dyes. The combination of a conducting polysilane and energy-matched dye molecules enabled us to open a field of Si-based EL devices through wet processes.