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Enhanced emission efficiency in electrospun polyfluorene copolymer fibers
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Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

Schematic representation of the polymer molecular arrangement in amorphous bulk and partially aligned, fiber microstructures.


Generic image for table
Table I.

List of the physical quantities measured (efficiency, Φ, and τ) and extracted by the analysis (τ and τ).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhanced emission efficiency in electrospun polyfluorene copolymer fibers