Comparative Study on Polymer Light-Emitting Devices Based on Blends of Polyfluorene and 4,7-Di-2-thienyl-2,1,3-benzothiadiazole with Devices Based on Copolymer of the Same Composition

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• 作者：Suqin Fan ; Mingliang Sun ; Zhao Chen ; Jie Luo ; Qiong Hou ; Junbiao Peng ; Hong Yang ; Dengqing Zhang ; Fuyou Li ; Yong Cao
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：June 7, 2007
• 年：2007
• 卷：111
• 期：22
• 页码：6113 - 6117
• 全文大小：446K
• 年卷期：v.111,no.22(June 7, 2007)
• ISSN：1520-5207

文摘

The small molecule 4,7-di-2-thienyl-2,1,3-benzothiadiazole (DBT) dye has been synthesized and blendedinto blue-emitting polyfluorene as a host. The photophysics of the blend films and electroluminescence deviceperformance was compared with that from polyfluorene-co-4,7-di-2-thienyl-2,1,3-benzothiadiazole (PFO-DBT) copolymer of the same molar composition, with DBT incorporated covalently into the polyfluorenebackbone. The role of intra- and interpolymer chain interaction and energy transfer in the polymer light-emitting devices are discussed. On the basis of the direct comparison of blend and copolymer from the samemolecular composition, we can draw the conclusion that, in conjugated polymers, intrachain energy transferalong the polymer backbone is more efficient than that via interchain interaction and plays a more importantrole in polymer light-emitting devices.