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Mesoscale structures in luminescent conjugated polymer thin films studied by near-field scanning optical microscopy

Tan, Czek Haan and Inigo, AR and Hsu, Jui-Hung and Fann, Wunshain and Wei, Pei-Kuen (2001) Mesoscale structures in luminescent conjugated polymer thin films studied by near-field scanning optical microscopy. Journal of Physics and Chemistry of Solids, 62 (9-10). pp. 1643-1654. ISSN 0022-3697

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We report the studies of various conjugated polymer thin films with near-field scanning optical microscopy, NSOM. Firstly, it is shown that MEH-PPV thin film undergoes significant changes in film morphology upon thermal annealing. The once homogeneous morphology becomes inhomogeneous after annealing. Secondly, polarization near-field measurements reveal mesoscale polymer ordering in PPV thin film. The average domain size and the coefficient for linear dichroism were studied as a function of film thickness. Finally, phase separation in polymer blend film was directly observed by transmission NSOM. Time-resolved fluorescence spectra indicate that the phase domains are decomposed of different fractions of the two constituent polymers. The near-field optical microscopy was also used to write lithographic patterns with a resolution of 100 nm, exceeding the diffraction limit. (C) 2001 Elsevier Science Ltd. All rights reserved.