External electric field effects on absorption and fluorescence spectra of a fullerene derivative and its mixture with zinc-tetraphenylporphyrin doped in a PMMA film.

Full Abstract

Electroabsorption and electrofluorescence spectra of a fullerene derivative, C60(C18)2, and its mixture with zinc-tetraphenylporphyrin (ZnTPP) have been measured by using electric field modulation spectroscopy. The change in dipole moment is significant in the electroabsorption spectra both of C60(C18)2 and of a complex composed of C60(C18)2 and ZnTPP, indicating that the excited states both of C60(C18)2 and of a complex between C60(C18)2 and ZnTPP have a large charge-transfer character. The fluorescence quantum yield of C60(C18)2 decreases in the presence of an electric field, which probably arises from the field-induced acceleration of the intramolecular nonradiative process of C60(C18)2 in the fluorescent state. In a mixture between ZnTPP and C60(C18)2, electrofluorescence spectra show the field-induced enhancement for the fluorescence of ZnTPP and the field-induced de-enhancement for the fluorescence both of C60(C18)2 and of the complex between ZnTPP and C60(C18)2. A theoretical analysis clearly shows that the field-induced enhancement of the ZnTPP fluorescence in a mixture results from the field-induced deceleration of the rate of the electron transfer from the excited ZnTPP to C60(C18)2. The standard free energy gap for the photoinduced electron-transfer process is estimated based on the theoretical simulation of the field-dependent fluorescence intensity.

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Author information

Author/s: Wahadoszamen, Md (M); Nakabayashi, Takakazu (T); Kang, Soonchul (S); Imahori, Hiroshi (H); Ohta, Nobuhiro (N);

Affiliation: Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 060-0812, Japan.

Journal and publication information

Publication Type: Journal Article

Journal: The journal of physical chemistry. B (J Phys Chem B), published in United States. (Language: eng)

Reference: 2006-Oct; vol 110 (issue 41) : pp 20354-61

Dates: Created 2006/10/12; Completed 2007/08/17;

PMID: 17034218, status: PubMed-not-MEDLINE (last retrieval date: 12/26/2008)

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