Molecular Engineering of C<sub>60</sub>-Based Conjugated Oligomer Ensembles: Modulating the Competition between Photoinduced Energy and Electron Transfer Processes
作者:Dirk M. Guldi、Chuping Luo、Angela Swartz、Rafael Gómez、José L. Segura、Nazario Martín、Christoph Brabec、N. Serdar Sariciftci
DOI:10.1021/jo0108313
日期:2002.2.1
oxidation potential of the donor. The resulting electro- and photoactive dyads were examined by electrochemical and photophysical means. In general, both singlet-singlet energy transfer and intramolecular electron transfer were found to take place and, most importantly, to compete with each other in the overall deactivation of the photoexcited oligomer. The selection of polar solvents in combination with the
从适当官能化的低聚物前体(即,二己基氧基萘,二己基氧基萘-噻吩和二己基氧基苯-噻吩)开始,合成了一系列新颖且可溶的C60-(π-共轭低聚物)二元组。低聚物组分性质的系统改变允许(i)通过将基态吸收从紫外光转移到可见光区域来定制发色团的光吸收,以及(ii)改变供体的氧化电势。通过电化学和光物理方法检查所得的电活性和光活性双性。通常,发现单重态-单态能量转移和分子内电子转移均发生,并且最重要的是,在光激发低聚物的整体失活中彼此竞争。极性溶剂与二己基氧基苯-噻吩供体的结合将反应性从全能(1a;二己基氧基萘)转移到了全电子转移场景(1d,二己基氧基苯-噻吩)。受二元组1d良好的电子传输特性的鼓励,我们通过将1d嵌入非对称金属触点之间来制备光电二极管,该电极在分子的最大吸收率下显示出接近10%的外部单色效率(IPCE)。