Ultrafast Singlet Fission in a Push-Pull Low-Bandgap Polymer Film.

• 笠井, 普文

• 玉井, 康成

• 大北, 英生

• 辨天, 宏明

• 伊藤, 紳三郎

抄録

Excited-state dynamics in poly[4, 6-(dodecyl-thieno[3, 4-b]thiophene-2-carboxylate)-alt-2, 6-(4, 8-dioctoxylbenzo[1, 2-b:4, 5-b]dithiophene)] (PTB1) was studied by transient absorption spectroscopy. Upon photoexcitation at 400 nm, an additional transient species is promptly generated along with singlet excitons and survives up to nanoseconds, while singlet excitons disappear completely. In order to assign the long-lived species, we measured transient absorption spectra over the wide spectral range from 900 to 2500 nm. As a result, we found that the long-lived species is ascribed not to polarons but to triplet excitons, which is formed through the ultrafast singlet fission (SF). We discuss the ultrafast SF mechanism in push-pull low-bandgap polymer PTB1 films on the basis of the excited-state dynamics under various excitation wavelengths and intensities.

収録刊行物

• Journal of the American Chemical Society

  Journal of the American Chemical Society 137 (51), 15980-15983, 2015-12-30

  American Chemical Society

詳細情報

• CRID: 1050001335829917824
• NII論文ID: 120005741086
• NII書誌ID: AA00692602
• ISSN: 00027863
• HANDLE: 2433/209996
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
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  • CiNii Articles