一种新型低带隙共轭聚合物的合成及其光学性质

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.

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

A novel low band-gap conjugated polymer poly3-octylthien-2,5-ylenediethynylene-co- benzoc]-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)benzoc]-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.