Photoluminescence of poly(3-alkylthiophene) in the liquid state is very noticeably enhanced under hydrostatic pressure. However, at high pressures above the liquid-solid transition, the luminescence intensity decreases and the emission peak shifts to a lower energy. These results are tentatively explained in terms of a change of the torsion angle at the bond between thiophene rings and the resulting change of effective conjugation length under pressure.
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Yoshino et al. (1989) studied this question.
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