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- Title
Simultaneous optimization of charge-carrier mobility and optical gain in semiconducting polymer films.
- Authors
Yap, Boon Kar; Xia, Ruidong; Campoy-Quiles, Mariano; Stavrinou, Paul N; Bradley, Donal D C
- Abstract
The combination of efficient light emission and high charge-carrier mobility has thus far proved elusive for polymer semiconductors, with high mobility typically achieved by cofacial pi-electron system to pi-electron system interactions that quench exciton luminescence. We report a new strategy, comprising the introduction of a limited number of more effective hopping sites between otherwise relatively isolated, and thus highly luminescent, polyfluorene chains. Our approach results in polymer films with large mobility (mu approximately 3-6 x 10(-2) cm2 V-1 s-1) and simultaneously excellent light-emission characteristics. These materials are expected to be of interest for light-emitting transistors, light-emitting diode sources for optical communications and may offer renewed hope for electrically pumped laser action. In the last context, optically pumped distributed feedback lasers comprising one-dimensional etched silica grating structures coated with polymer have state-of-the-art excitation thresholds (as low as 30 W cm(-2) (0.1 nJ per pulse or 0.3 microJ cm-2) for 10 Hz, 12 ns, 390 nm excitation) and slope efficiencies (up to 11%).
- Publication
Nature materials, 2008, Vol 7, Issue 5, p376
- ISSN
1476-4660
- Publication type
Journal Article
- DOI
10.1038/nmat2165