Interchain photoluminescence in substituted polyfluorenes

Summary, in English

We have characterised the interchain emitting states of two substituted polyfluorenes with steady-state and time-resolved photoluminescence (PL). Site selective excitation of the interchain state shows that physical dimers are formed in the film. These dimers have low concentration in the films but exciton diffusion to the dimers is reducing the intrachain exciton lifetime. With asymmetrical substituents, the PL quantum yield is higher and the PL lifetime is longer due to lower concentration of dimers. Slow cooling from the melt, gives a new red shifted emission band and less intrachain emission. A discrepancy in the calculated radiative lifetimes suggest a fast formation of this new band.

• Author: M. Theander; D. M. Johansson; A. Ruseckas; Donatas Zigmantas; M. R. Andersson; Villy Sundström; O. Inganas
• Department/s: Chemical Physics
• Publishing year: 2001
• Language: English
• Pages: 615-616
• Publication/Series: Synthetic Metals
• Volume: 119
• Issue: 1-3
• Links: http://dx.doi.org/10.1016/S0379-6779(00)00788-8
• Document type: Journal article
• Publisher: Elsevier
• Topic: Atom and Molecular Physics and Optics
• Keywords: photoluminescence; uv-vis-nir absorption; polyfluorenes and derivatives; time-resolved fast spectroscopy
• Status: Published
• ISBN/ISSN/Other: ISSN: 0379-6779