Morphology, fluorescence properties, and their photothermal changes of poly(substituted thiophene) films revealed by near-field fluorescence microspectroscopy

The morphology and fluorescence spectrum of poly(3-[2-(N-dodecylcarbamoylox y)ethyl]thiophene-2,5-diyl) film were examined with spatial resolution of 1 00 nm using near-field fluorescence microspectroscopy. Fluorescence spectra observed at protruding domains were blue-shifted compared with flat areas, and further blue-shift was observed there more appreciably by long-time ir radiation Eia a near-field scanning optical microscope probe. It is conside red that the polymer chains at the protruding domains take disordered confo rmations, in which conjugated lengths are shorter and further disordering c an be induced more easily by irradiation compared with those in the flat ar eas.