Laser characteristics of a family of benzene-cored star-shaped oligofluorenes

Georgios Tsiminis, Neil A. Montgomery, Alexander L. Kanibolotsky, Arvydas Ruseckas, Igor F. Perepichka, Peter J. Skabara, Graham A. Turnbull, Ifor D. W. Samuel

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


A family of star-shaped conjugated oligofluorene molecules based around a central benzene core is studied with the aim of identifying how changes in molecular structure can affect the laser performance of organic materials. As the oligofluorene arm length increases the optical transitions are found to move to longer wavelength, there is an increase in photoluminescence quantum yield and a corresponding reduction in the excitation density for amplified spontaneous emission. Distributed-feedback lasers based on these materials are tunable across 402-462 nm with lasing thresholds as low as 1.1 kW cm(-2) and efficiencies as high as 6.6%. The laser performance is compared with that of family of star-shaped molecules with different core structure. This shows that a reduction in intermolecular interactions is very important to achieving high performance lasing in organic semiconductors.

Original languageEnglish
Article number094005
Number of pages6
JournalSemiconductor Science and Technology
Issue number9
Publication statusPublished - 1 Sep 2012


  • polymers
  • organics
  • laser characteristics
  • phosphorescence spectra
  • quantum optics
  • lasers


Dive into the research topics of 'Laser characteristics of a family of benzene-cored star-shaped oligofluorenes'. Together they form a unique fingerprint.

Cite this