Characteristics of a single-layered organic electroluminescent device using a carrier-transporting copolymer and a nonconjugated light-emitting polymer

초록

We have synthesized a novel carrier-transporting copolymer and a nonconjugated light-emitting polymer. The carrier-transporting copolymer has a triphenylamine moiety as a hole-transporting unit and a triazine moiety as an electron-transporting unit, both of which are located in the polymer side chain. The nonconjugated light-emitting polymer has a perylene moiety, which acts as an emitting unit in the polymer side chain. These polymers are very soluble in most organic solvents, such as monochlorobenzene, tetrahydrofuran, chloroform, and benzene. A single-layered electroluminescent device consisting of ITO/copolymer and emitting-material 4-(dicya-nomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (I)CM) or light-emitting polymer)/Al mixtures exhibits maximum external quantum efficiency when the concentration of the emitting material is 30 wt %. The device emits red or blue light according to the emitting material. When CsF is used as the electron-injecting material, the drive voltage decreases drastically to 7 V, and the highest quantum efficiency is 0.5%. (C) 2003 Wiley Periodicals, Inc.

키워드