Fluorescence Properties of Si-Linked Oligothiophenes
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- 作者：Mamoru Fujitsuka ; Dae Won Cho ; Joji Ohshita ; Atsutaka Kunai ; Tetsuro Majima
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：February 8, 2007
- 年：2007
- 卷：111
- 期：5
- 页码：1993 - 1998
- 全文大小：234K
- 年卷期：v.111,no.5(February 8, 2007)
- ISSN：1932-7455
文摘
The fluorescence properties of Si-linked oligothiophenes were investigated by using various spectroscopicmethods. From the molecular orbital calculation, it was indicated that Si-linked oligothiophenes tend to takestructures with a smaller repulsion between oligothiophene entities and methyl groups on the Si-atom. Steadystate absorption spectra showed red-shifted absorption peaks due to the 
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conjugation when comparedwith the corresponding oligothiophenes. Peak shift to the longer wavelength side was also confirmed in thefluorescence spectra. Si-linked terthiophenes showed excimer formation upon excitation with a pulsed laser,although its formation yield was as small as ~0.1-0.2. On the other hand, Si-linked pentathiophenes do notform the excimer probably because of the lower mobility of larger oligothiophenes. From the anisotropydecay, excitation energy migration among the oligothiophenes was confirmed. The excitation energy migrationwas discussed on the basis of the incoherent energy hopping mechanism. The effect of - conjugation onthe present energy transfer was indicated.
- conjugation when comparedwith the corresponding oligothiophenes. Peak shift to the longer wavelength side was also confirmed in thefluorescence spectra. Si-linked terthiophenes showed excimer formation upon excitation with a pulsed laser,although its formation yield was as small as ~0.1-0.2. On the other hand, Si-linked pentathiophenes do notform the excimer probably because of the lower mobility of larger oligothiophenes. From the anisotropydecay, excitation energy migration among the oligothiophenes was confirmed. The excitation energy migrationwas discussed on the basis of the incoherent energy hopping mechanism. The effect of - conjugation onthe present energy transfer was indicated.