Development of electroluminescence device containing water soluble polysilane and organic dyes in sol-gel glass

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It is known that polysilanes display unique characteristics such as UV absorption, photo-, and electroluminescence due to σ-conjugation of the Si-Si main chain. We have been studied the preparation of new water-soluble polysilane, the energy transfer and radiative properties of polysilanes, and energy-matched counterparts. And, it was found that photo-oxidation during irradiation an ultraviolet light was suppressed by using water-soluble polysilanes and embedding them inside sol-gel glass matrices. However, there are problems for the preparation of watersoluble polysilanes, because Wurtz type reaction usually gives only a low yield. So, it is important to improve the way for the synthesis of water-soluble polysilanes.We have interested in the use of commercially available dodecaphenylcyclopentasilane(DPCPS). DPCPS was treated with Li in tetrahydrofuran to give ring opening intermediate ; α, ω-dilithiododecaphenylpetasilane. Reaction of the intermediate with an equimolecular amount of d … More ichlorodimethylsilane afforded cyclic polysilanes, resulted from intramolecular cyclization reaction, and a small amount of low molecular-weight polymer. On the other hand, the treatment of the intermediate with an equimolecular amount of 1,2-dichlorotetramethyldisilane gave higher molecular weight polysilane co-polymer as a result of predominant intermolecular reaction.The obtained co-polymer was successfully converted into water-soluble polysilane derivative by successive Friedel-Crafts chloromethylation and quaternary ammonium reaction.The intermolecular energy transfer from conductive poly(m-hexoxyphenyl)phenylsilane was utilized for electroluminescence(EL) of perylene (blue), coumarin 6 (green), 4-(dicyanometliylene)-2-methyl-6-(p-dimethylammostyryl)-4H-pyran and Zinc tetra-phenylporphyrin (red). A white EL was also observed by mixing the four dyes. Photo-oxidation during irradiating a ultraviolet light was suppressed by synthesizing water-soluble polysilanes and embedding it inside sol-gel glass matrices. These results imply that polysilanes have a possibility to open new fields of optical application. Less