Abstract
Abstract Photoisomerization of vinylenes is well known to cause remarkable changes in the photophysical properties of poly (p-phenylene vinylene) (PPV) derivatives. C is- / trans- isomerization is also expected to induce significant changes in their charge transport properties. In this study, the charge transport properties of cis- and trans- isomers of 2,5-diphenyl-1,4-distyrylbenzene (DPDSB, model compound of PPV) were investigated using a Marcus hopping model. As expected, this conformational transition from cis- to trans- isomer gives rise to a significant difference between hole and electron transport properties. Cis- DPDSB demonstrates an overwhelmingly superior hole transport ( μ h / μ e = 51), which is even higher than that of trans- DPDSB. By contrast, trans- DPDSB exhibits approximately balanced carrier transport property ( μ h / μ e = 1.79). These results are understood on a molecular level by considering the structure-transport relationship through two key parameters: transfer integral and reorganization energy. This finding may be helpful in understanding and extrapolating the structure–property relationship and charge transport property of the corresponding PPV polymers derivatives.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call