Spectroscopy and single-molecule emission of a fluorene-terthiophene oligomer

Khalil, G. E.; Adawi, A. M.; Robinson, B.; Cadby, A. J.; Tsoi, W. C.; Kim, J-S.; Charas, A.; Morgado, J.; Lidzey, D. G.

Abstract

We study the thiophene-based oligomer poly[2,7-(9,9-bis(2′-ethylhexyl)fluorene)-alt-2,5-terthiophene] (PF3T) in solution and when dispersed at low concentration into a polynorbornene matrix. We find that at high concentration in solution the 0–0 electronic transition observed in fluorescence is suppressed, a result indicative of the formation of weakly coupled H-aggregates. At low concentration in a polymer matrix, emission from both single molecules and molecular aggregates is observed. We find that the fluorescence spectra of most PF3T emitters are composed of a number of relatively narrow emission features, indicating that the emission usually occurs from multiple chromophores. A small number of PF3T molecules are however characterized by single chromophore emission, spectral blinking, and narrowed emission peaks.

Citation

Khalil, G. E., Adawi, A. M., Robinson, B., Cadby, A. J., Tsoi, W. C., Kim, J.-S., Charas, A., Morgado, J., & Lidzey, D. G. (2011). Spectroscopy and single-molecule emission of a fluorene-terthiophene oligomer. Journal of Physical Chemistry B, 115(42), 12028-12035. https://doi.org/10.1021/jp206368g

• Journal Article Type: Article
• Online Publication Date: Sep 14, 2011
• Publication Date: Oct 27, 2011
• Journal: Journal of Physical Chemistry B
• Print ISSN: 1520-6106
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 115
• Issue: 42
• Pages: 12028-12035
• DOI: https://doi.org/10.1021/jp206368g
• Keywords: Physical and Theoretical Chemistry; Materials Chemistry; Surfaces, Coatings and Films
• Public URL: https://hull-repository.worktribe.com/output/424113
• Publisher URL: https://pubs.acs.org/doi/abs/10.1021/jp206368g