| 초록 |
A series of conjugated copolymers have been synthesized through a palladium-catalyzed Suzuki coupling reaction. These copolymers are based on the copolymerization among 9,9’-dioctylfluorene, thieno[3,2-b]thiophene, and the other comonomers. As third or fourth comonomers, benzothiadiazole and ethylhexyloxy-triphenylamine are incorporated into the polymer backbone as an electron-transporting and a hole-transporting moiety, respectively. All the three copolymers are completely soluble in common organic solvents such as chloroform, xylene, and toluene, whereas alternating copolymer, PFTT, shows lower solubility towards these solvents. As a film, the polymer with only ethylhexyloxy-triphenylamine moiety exhibits photoluminescence emission maximum at 510 nm which is about the same as that of pure green light-emitting polymer, PFTT; the polymers containing a benzothiadiazole moiety show red-shifted PL maxima at around 540-545 nm. In addition, the copolymers exhibit higher photoluminescence quantum efficiencies than PFTT. Detailed synthetic scheme and electroluminescent properties of the copolymers will be presented. |
