Dynamics of conformational relaxation in photoexcited oligofluorenes and polyfluorene

Hintschich, SI; Dias, FB; Monkman, AP

Abstract

In order to disentangle the relaxation effects of exciton migration and conformational rearrangement, a comparative study of a polyfluorene derivative and short oligofluorenes is carried out. We probe their long-time time-dependent relaxation in dilute solution using picosecond single photon counting and streak camera techniques. Conformational relaxation is found in oligo- and polyfluorenes. Oligofluorene relaxation is purely conformational: time scales vary between 10 and 300 ps becoming faster with decreasing chain length and solvent viscosity or increasing temperature. While a rigid ladder-type polymer in solution does not show any picosecond relaxation, polyfluorene in solution exhibits fluorescence dynamics indicating both, conformational relaxation and exciton migration.

Citation

Hintschich, S., Dias, F., & Monkman, A. (2006). Dynamics of conformational relaxation in photoexcited oligofluorenes and polyfluorene. Physical review B, 74(4), https://doi.org/10.1103/physrevb.74.045210

• Journal Article Type: Article
• Publication Date: 2006
• Deposit Date: Nov 3, 2010
• Journal: Physical review B - Condensed Matter and Materials Physics
• Print ISSN: 1098-0121
• Electronic ISSN: 1550-235X
• Publisher: American Physical Society
• Volume: 74
• Issue: 4
• DOI: https://doi.org/10.1103/physrevb.74.045210
• Public URL: https://durham-repository.worktribe.com/output/1537629