Three-dimensional conjugated polymers as efficient light-emitting materials
Most conjugated oligomers and polymers are rod-like molecules, which are prone to aggregate and end up self-quenching their luminescence in solid state. In order to reduce the aggregation of the rod-like conjugated polymers chains, we have designed and synthesized a series of three-dimensional conjugated molecules. Their electro-optic properties were also investigated. For example, random hyperbranched polymers containing 9,9-dioctylfluoren-2,7-diyl units were prepared by an one-pot AB2 + AB approach. These blue light emitting hyperbranched polymers can form good quality amorphous films and exhibit very good luminescent stabilities.No green-blue band emission was observed in their photoluminescent spectra even after the films were annealed at 200 ℃ for 30 min in air. Using a device configuration of ITO/PEDOT/polymer/Ca, a luminance of more than 3000 cd/m2 and an external quantum efficient yield of 2.46％ were obtained for the hyperbranched polymers.Compared with the linear polyfluorenes, significant improvement has been achieved.
Zhishan Bo
Institute of Chemistry,Chinese Academy of Sciences,Beijing,100190,China.
国际会议
5th International Symposium on High-Tech Polymer Materials(HTPM-V)(第五届国际高技术高分子材料学术会议)
北京
英文
58-59
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）