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

S. Suto, M. Shimizu, T. Goto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages106-107
Number of pages2
ISBN (Electronic)0780356616, 9780780356610
DOIs
Publication statusPublished - 1999 Jan 1
Event1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999 - Seoul, Korea, Republic of
Duration: 1999 Aug 301999 Sep 3

Publication series

NameCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
Volume1

Other

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Networks and Communications
  • Physics and Astronomy(all)

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    Suto, S., Shimizu, M., & Goto, T. (1999). Exciton dynamics in the α-conjugated polymer of poly(di-n-hexylsilane). In CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics (pp. 106-107). [811646] (CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics; Vol. 1). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CLEOPR.1999.811646