Ultrafast energy transfer dynamics between block copolymer and π-conjugated polymer

Youg Hee Kim, Sae Chae Jeoung, Dongho Kim, Ja Young Han, Hong Ku Shim

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

Abstract

The quantum efficiency of the blended polymeric system consisting of poly[2-methoxy-5-(2-ethylhexyloxy)-l,4-phenylenevinylene] (MEH-PPV) and conjugated-nonconjugated multi-block copolymer (CNMBC), poly[l,3-propane-dioxy-1,4-phenylene-1,2-ethylene-(2,5-bis(trimethylsilyl)-1,4 -phenylene)-1,2-ethylene-1,4-phenylene] (DSiPV) is several times higher than that of the constituent polymers, which is explained in terms of the Forster energy transfer theory. But the ultrafast photoexcitation dynamics of MEH-PPV and of the blended polymer consisting of MEH-PPV and DSiPV using the time-resolved fluorescence and femtosecond transient absorption spectroscopic techniques suggests that other mechanisms should be involved. No apparent change in the absorption spectrum of the blended polymer (MEH-FPV:DSiPV=6:4 mass ratio) compared to those of MEH-PPV and DSiPV indicates that neither chemical nor conformational change has occurred upon mixing. Their time-integrated photoluminescence (PL) spectra show that upon blending, the emission from DSiPV disppears while that from MEH-PPV predominates with a slight red-shift of the emission maximum. The red-shifted PL spectrum and the disappearance of the stimulated emission (SE) in the transient absorption spectrum of the blended polymer clearly indicates that two different emissive states play roles in the relaxation process of the primary photoexcitations in MEH-PPV thin films.

Original languageEnglish
Title of host publicationCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages722-723
Number of pages2
ISBN (Electronic)0780356616, 9780780356610
DOIs
Publication statusPublished - 1999
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
Volume3

Other

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

All Science Journal Classification (ASJC) codes

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

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