Exciton dynamics in the α-conjugated polymer of poly(di-n-hexylsilane)

S. Suto, M. Shimizu, T. Goto

研究成果: Conference contribution

抄録

To elucidate the exciton dynamics at low exciton density, we have carried out measurements of the absorption, luminescence, luminescence excitation spectra, and time response of the luminescence intensity of poly(di-n-hexylsilane) (PDHS) film at 2 K. A broad absorption peak is observed at 3.40 eV and a sharp luminescence line at 3.37 eV. In the luminescence excitation spectra, the luminescence peak energy shift is found with the excitation energy below 3.385± 0.005 eV. This fact shows that the site selective excitation is observed below the excitation energy, and indicates that the energy relaxation rate of excitons changes dramatically around the energy. To understand the above results, we have formulated the exciton dynamics using a one dimensional Frenkel exciton Hamiltonian with disorder. We have also carried out measurements of the time response of luminescence intensity using the up-conversion technique in order to elucidate the exciton dynamics at high density. We have clearly observed the rise time of 1.4±0.5 ps, which is fifty times as fast as that at low exciton density. The decay time is also faster. Moreover, the luminescence quantum efficiency at the exciton density is ten times smaller than that at the low density. A process to explain these results is considered.

本文言語English
ホスト出版物のタイトルCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
出版社Institute of Electrical and Electronics Engineers Inc.
ページ106-107
ページ数2
ISBN(電子版)0780356616, 9780780356610
DOI
出版ステータスPublished - 1999 1月 1
イベント1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999 - Seoul, Korea, Republic of
継続期間: 1999 8月 301999 9月 3

出版物シリーズ

名前CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
1

Other

Other1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999
国/地域Korea, Republic of
CitySeoul
Period99/8/3099/9/3

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学
  • コンピュータ ネットワークおよび通信
  • 物理学および天文学(全般)

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