Development of Highly Performed Organic Display Devices

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For the purpose of developing organic display devices with high performances, we have investigated the synthesis and electrochromic properties of new polymers containing pendant oligothiophenes, and fabrication and performances of organic electroluminescent (EL) devices using novel amorphous molecular materials.We have synthesized new vinyl and methacrylate homopolymers containing pendant oligothiophenes with well-defined structures and new methacrylate copolymers containing pendant terthiophene and oligoethyleneoxide moieties. These polymers were found to constitute a novel class of potential electrochromic materials, undergoing a reversible clear color change on electrochemical doping and dedoping. It was also found that the response times for coloration and decoloration improve for the methacrylate copolymers are than for the methacrylate homopolymer.We have designed and synthesized novel pi-electron starburst molecules with high glass-transition temperatures, and developed thermally stable organic EL devices using these novel amorphous molecular materials. In addition, we have developed a novel blue-emitting meterial, tri(p-terphenyl-4-yl) amine, and blue-emitting organic EL devices. We found that the emission color can be tuned by using exciplex formation for a fixed electron-transport material in combination with holetransport materials with varying ionization potentials. We have designed and synthesized a novel family of pi-conjugated molecules containing an oligothiophene moiety and found that the electroluminescence color can be controlled by varying the conjugation length of the oligothiophene moiety.