Spin dynamics of carrier generation in a photoconductive C 60-doped poly(N-vinylcarbazole) film

Toshinari Ogiwara; Tadaaki Ikoma; Kimio Akiyama; Shozo Tero-Kubota

doi:10.1016/j.cplett.2005.06.066

Spin dynamics of carrier generation in a photoconductive C ₆₀-doped poly(N-vinylcarbazole) film

Toshinari Ogiwara, Tadaaki Ikoma, Kimio Akiyama, Shozo Tero-Kubota

Division of Organic- and Biomaterials Research

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

The magnetic field effects on the carrier yield have been studied to clarify the spin dynamic process during photoinduced carrier generation in a fullerene (C₆₀)-doped poly(N-vinylcarbazole) (PVCz) film. The charge transfer (CT) complex of C₆₀ and the carbazole (Cz) chromophore is selectively excited. The total number of carriers that escaped from the geminate pairs decreases in the presence of magnetic fields, which arises from a hyperfine mechanism of the distant ion pairs involving C60- and Cz ⁺. Time-resolved EPR measurements verify that the excited triplet state of C₆₀ is produced via its excited singlet state generated from the contact ion pair. The competitive formation processes of distant ion pairs and the excited states of C₆₀ from the contact ion pair are discussed.

Original language	English
Pages (from-to)	378-383
Number of pages	6
Journal	Chemical Physics Letters
Volume	411
Issue number	4-6
DOIs	https://doi.org/10.1016/j.cplett.2005.06.066
Publication status	Published - 2005 Aug 15

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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title = "Spin dynamics of carrier generation in a photoconductive C 60-doped poly(N-vinylcarbazole) film",

abstract = "The magnetic field effects on the carrier yield have been studied to clarify the spin dynamic process during photoinduced carrier generation in a fullerene (C60)-doped poly(N-vinylcarbazole) (PVCz) film. The charge transfer (CT) complex of C60 and the carbazole (Cz) chromophore is selectively excited. The total number of carriers that escaped from the geminate pairs decreases in the presence of magnetic fields, which arises from a hyperfine mechanism of the distant ion pairs involving C60- and Cz +. Time-resolved EPR measurements verify that the excited triplet state of C60 is produced via its excited singlet state generated from the contact ion pair. The competitive formation processes of distant ion pairs and the excited states of C60 from the contact ion pair are discussed.",

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AU - Ogiwara, Toshinari

AU - Ikoma, Tadaaki

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AU - Tero-Kubota, Shozo

PY - 2005/8/15

Y1 - 2005/8/15

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