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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (8): 999-1002. 上一篇    下一篇

研究简报

一种新型低带隙共轭聚合物的合成及其光学性质

刘中义，李彦军，黄鹏程*   

  1. (北京航空航天大学材料科学与工程学院 北京 100083)
  • 投稿日期:2007-11-30 修回日期:2008-01-14 发布日期:2008-04-28
  • 通讯作者: 黄鹏程

Synthesis and Optical Properties of a Novel Low Band-Gap Conjugated Polymer

LIU Zhong-Yi LI Yan-Jun HUANG Peng-Cheng*   

  1. School of Materials Science and Engineering, Beihang University, Beijing 100083)
  • Received:2007-11-30 Revised:2008-01-14 Published:2008-04-28
  • Contact: HUANG Peng-Cheng

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712

被引次数

14

在钯催化剂作用下, 通过4,7-二(5-溴-2-噻吩基)[2,1,3]苯并噻二唑与2,5-二乙炔基-3-辛基噻吩的偶联反应, 合成了一种新的共轭高分子聚4,7-二(2-噻吩基)苯并噻二唑-3-辛基噻吩二炔(PTE-DTBT). 通过紫外可见吸收光谱及荧光光谱对其光学性质进行了研究. 紫外-可见吸收谱结果表明, PTE-DTBT的固体膜光学带隙为1.71 eV; 电化学测试其带隙为1.88 eV. TiO2/PTE-DTBT共混固体膜的荧光发射谱结果表明电子供体PTE-DTBT分子与电子受体TiO2分子间存在有效的电子转移.

关键词: 聚4,7-二(2-噻吩基)苯并噻二唑-3-辛基噻吩二炔, 低带隙共轭聚合物, 光学性质, 合成

A novel low band-gap conjugated polymer poly[3-octylthien-2,5-ylenediethynylene-co- benzo[c]-1',2',5'-thiadiazo-3,6-ylenedi(2,5-thienylene)] (PTE-DTBT) was prepared by a palladium-catalyzed coupling reaction of 3,6-bis(5-bromothien-2-yl)benzo[c]-1',2',5'-thiadiazole with 2,5-diethynyl-3-octylthiophene. UV-Vis absorption spectrum and cyclic voltammetry of PTE-DTBT film show that its optical band gap and electrochemical band gap are 1.71 and 1.88 eV, respectively. The photoluminescence emission at 678 nm of the PTE-DTBT film can be easily quenched by TiO2. The low band-gap and the electron transition property of the polymer indicate that PTE-DTBT is a suitable candidate for the active materials in polymer solar cells.

Key words: poly[3-octylthien-2,5-ylenediethynylene-co-benzo[c]-1',2',5'-thiadiazo-3,6-ylenedi(2,5, low band-gap conjugated polymer, optical property, synthesis