We investigate the temporal properties of the fluorescence emitted by such devices after excitation with an ultrashort optical pulse using a novel wide-field method, fluorescence lifetime imaging (FLIM). This has not previously been applied to PLEDs and provides a new technique for studying the processes leading to black spot formation. The FLIM system developed at Imperial College uses an ultrafast time-gated image intensifier based on microchannel plate technology. This (coupled together with a CCD) can stroboscopically record time-gated images of the fluorescence emitted by a sample after pulsed excitation by changing the trigger delay between optical excitation and signal collection by the CCD. The images from the CCD are then analysed computationally pixel-by-pixel using, for instance, a single exponential decay model so that an image of the fluorescence lifetimes can be created on a false colour scale (a FLIM map). PLED defects have also been studied with FLIM, including bubble formation in the polymer layer. The application of fluorescence lifetime imaging provides a novel method to achieve contrast in microscopic studies of the properties of PLEDs and to probe the mechanisms behind defect formation.


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    Title :

    Fluorescence lifetime imaging of polymer LEDs


    Contributors:
    Elson, D.S. (author) / Koeberg, M. (author) / Siegel, J. (author) / Mendez, E. (author) / Webb, S.E.D. (author) / Bradley, D.D.C. (author) / French, P.M.W. (author)


    Publication date :

    2003-01-01


    Size :

    121589 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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