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(a) Chemical structure of F8BT (from American Dye Source datasheet). (b) SEM image, representative of the sample. (c) Confocal microscopy image of two single electrospun fibers.
(a) Polarized PL intensity vs. the analyzer angle (measured with respect the fiber axis) of a single F8BT fiber (symbols) and relative best fit to Eq. (1) . The emission intensity is maximum when the analyzer axis is parallel to the fiber length (θ = 0°). (b)–(e) Fluorescence micrographs of the fiber at the different polarization angles. The white arrow indicates the analyzer position with respect to the fiber axis.
(a) Comparison between the normalized absorbance (left vertical scale) and PL (right scale) spectra of F8BT fibers (red lines) and film (black symbols). (b) PL temporal trace of F8BT fibers (symbols) and corresponding best fit (red continuous line) to an exponential function convoluted with the Instrumental Response Function (dashed line) on a semi-log scale.
Schematic representation of the polymer molecular arrangement in amorphous bulk and partially aligned, fiber microstructures.
List of the physical quantities measured (efficiency, Φ, and τobs) and extracted by the analysis (τrad and τnrad).
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