1999年5月
Energy migration and excimer formation in quasi-two-dimensional polymer films as revealed by the time-resolved fluorescence depolarization measurement
JOURNAL OF PHYSICAL CHEMISTRY A
- ,
- ,
- ,
- 巻
- 103
- 号
- 18
- 開始ページ
- 3402
- 終了ページ
- 3409
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/jp9840735
- 出版者・発行元
- AMER CHEMICAL SOC
Excitation energy migration and subsequent energy transfer to excimer-forming sites occurring in a quasi-two-dimensional plane of poly(isobutyl methacrylate) Langmuir-Blodgett films were investigated through the time-resolved analyses of anthracene fluorescence. Fluorescence anisotropy decays showed that the energy migration occurred more efficiently as the anthracene fraction increased. A further increase of the anthracene gave rise to the excimer-forming sites acting as energy traps, and finally the anthracene fluorescence was markedly quenched from the energy transfer to the traps. The migration process was quantitatively analyzed by a computer simulation based on the Monte Carlo method, which allowed estimation of the number of hopping and the mean-square displacement of excitons. The initial growth of the mean-square displacement with time became gradually gentle, while the number of hopping linearly increased with time. This result shows that the excitons are not diffusive and tend to stay within a small cluster of chromophores, especially for small chromophore density at short times.
- リンク情報
- ID情報
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- DOI : 10.1021/jp9840735
- ISSN : 1089-5639
- J-Global ID : 200902123213343277
- Web of Science ID : WOS:000080304200009