| Abstract
| - Two types of energy transfer in π-conjugated polymers have been investigated using time-resolvedphotoluminescence (PL) techniques: type i, perpendicular-type energy transfer from the 2,3-di(p-tolyl)quinoxaline unit to the π-conjugated main chain of poly[2,3-di(p-tolyl)quinoxaline-5,8-diyl], and type ii, parallel-type energy transfer from the oligo(pyridine-2,5-diyl) (O−Py) unit to the oligo(selenophene-2,5-diyl)(O−Se) unit in a block-type copolymer of O−Py and O−Se. Both types of energy transfer were very fastwith a time constant shorter than approximately 0.1 ns; in particular, the type ii energy transfer took placewith a time constant of approximately 5 ps. Both π-conjugated polymers were considered to contain segmentswith various effective π-conjugation lengths, and the energy transfer to the segment with a larger effectiveπ-conjugation length and a smaller π−π* transition energy required a longer transition time. A polarizingfilm was obtained by utilizing the perpendicular-type energy transfer.
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