Infrared studies of optically excited polydiacetylene
- 14 November 1987
- journal article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 20 (11), 1361-1366
- https://doi.org/10.1088/0022-3727/20/11/004
Abstract
Photo-induced absorption (PA) is observed for the polydiacetylene PDA-10H in the infrared which is found to be consistent with the photogeneration of charged bipolarons. No comparable PA is seen in PDA-TS, a result that is consistent with photo-excitation leading to the formation of triplet excitonic bipolarons. Persistent effects are observed for PA in PDA-10H indicating a long carrier lifetime due to trapping. Electron correlation is significant and shifts the electronic transitions to lower energy in PDA-10H so that overlap of electronic and vibrational transitions occurs. This overlap leads to strong anti-resonances in the PA due to electron-phonon interaction.Keywords
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