New π-Conjugated Polyaryleneethynylenes (PAEs) Comprising of Fluorene and Bis(perfluorohexyl) benzene Units. An Investigation of the Effect of Fluorine-Wt％ on the Optoelectronic Properties of the Polymers
A series of new p-conjugated poly(aiyleneethynylene)s (PAEs) comprising of fluorene and bis(perfluorohexyl)benzene units were synthesized by the polycondensation of 2,7-diethynyl-9,9-dioctylfluorene with 2,7-dibromo-9,9-dioctylfluorene and different mol％ of 2,5-dibromo-l ,4-bis(perfluorohexyl) benzene using Pd(PPh3)4 and CuI as the catalysts. The polymers were soluble in common organic solvents and gave a range of the number-average molecular weights ( Mn) from 6 800 to 42 000. The optical and electrochemical properties of the polymers were dependent on the mol％ of bis(perfluorohexyl)benzene (BFB) unit in the polymers. E. g. , when the mol％ was5, 25, 40 and 50％ , respectively, the fluorescence quantum yield (FQY) of the polymers increased from 63％ of poly (9,9-dioctylfluoreneethynylene) (PFE) to 73, and 81, 88 and 92％ of the copolymers, respectively, suggesting that introducing BFB unit was able to greatly enhance the FQY of PFE. Electrochemically, the BFB-containing PFE showed lower reduction potential than PFE. All fluorine-containing polymers have good thermal stability. To investigate the electroluminescent properties of the polymers , two non-optimized devises were fabricated using PFE and a PFE-based polymer containing 25-mol％ of BFB unit as the emitting layers, respectively. The results indicated that the latter showed higher brightness and current efficiency than the former.
Pory(aryleneethynylene)s Fluorine-containing Polymers Polymeric Light Emitting Diodes
Danli Zeng Junping Du Jing Sun Erjian Xu Amin Cao Qiang Fang Junwu Chen Zhao Chen Weihong Zhu Jun He Feng Yu Huanrong Wu Chang Liu Shijie Ren
Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences,354 Fenglin Road, Shanghai 2000 Institute of Polymer Optoelectronic Materials and Devices,South China University of Technology, Guan Laboratory for Advanced Materials and Institute of Fine Chemicals,East China University of Science a R&D Center for Flat Panel Display Technology, SVA Company,Shanghai 200081, China
国际会议
上海
英文
396-400
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）