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9 September 2014 Direct measurement of energy transport in organic nanosystems
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Conjugated polymers are appealing materials for cost-effective production of flexible electronic devices, but the efficiency of these devices may be compromised by exciton quenching by hole polarons. Exciton migration was monitored directly in single poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) chains embedded in a hole-injection device by applying super-resolution point-spread function fitting techniques to the fluorescence image of each chain as holes were reversibly injected into the polymer. Correlated excitation polarization spectroscopy techniques reported the orientation of the longitudinal axis of the rod-like polymers. The wide-field microscopy images are diffraction-limited in one dimension but slightly elongated in the direction of the longitudinal axis of the rod-like polymer in most cases and at every depth of fluorescence quenching explored.
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Katherine A. Koen, Katie A. Clark, and David A. Vanden Bout "Direct measurement of energy transport in organic nanosystems", Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 91650K (9 September 2014);

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