Amplified spontaneous emission in optically pumped neat films of a polyfluorene derivative

Jiu Yan Li*, Frederic Laquai, Gerhard Wegner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We report the emissive properties of a fluorene-based polymer, PF-1SOR, in planar asymmetric waveguides under optical pumping. A laser beam homogenizer setup was applied to achieve the flat-top intensity profile of the excitation light. Amplification of deep blue light via stimulated emission (SE) occurred at an energy threshold of 11 μJ cm-2 and the amplified spontaneous emission (ASE) peak could be tuned from 411 to 423 nm. A net gain coefficient of 19.8 cm-1 was obtained by means of the modified variable stripe length (VSL) method. The PF-1SOR thin films delivered a remarkably low loss coefficient of 1.5 cm-1, among the lowest ever reported for a single component polymer waveguide.

Original languageEnglish (US)
Pages (from-to)37-41
Number of pages5
JournalChemical Physics Letters
Issue number1-3
StatePublished - Aug 17 2009

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

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