Abstract
AbstractBy coupling femtosecond pulses to a hollow‐pyramid aperture SNOM, we demonstrate nonlinear near‐field two‐photon photoluminescence imaging of organic semiconductors. We discover that two‐photon excitation of the blue‐emitting poly(9,9‐dioctylfluorene) (PFO) selectively addresses the keto‐defect units which are responsible for a shifted green‐orange emission. We exploit this effect to map oxidized sites in the PFO film with high contrast and spatial resolution, introducing a novel tool for characterizing oxygen‐induced degradation in electroluminescent materials. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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