Interchain photoluminescence in substituted polyfluorenes

M Theander*, DM Johansson, A Ruseckas, D Zigmantas, MR Andersson, Sundstrom, O Inganas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)615-616
Number of pages2
JournalSynthetic Metals
Volume119
Issue number1-3
Publication statusPublished - 15 Mar 2001
Event16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) - GASTEIN, Austria
Duration: 15 Jul 200021 Jul 2000

Keywords

  • polyfluorenes and derivatives
  • UV-Vis-Nir absorption
  • photoluminescence
  • time-resolved fast spectroscopy

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