Photophysical Properties of Oligo(2,3-Thienyleneethynylene)s

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• 作者：Yosuke Oseki ; Mamoru Fujitsuka ; Michihiro Hara ; Xichen Cai ; Yutaka Ie ; Yoshio Aso ; and Tetsuro Majima
• 刊名：Journal of Physical Chemistry B
• 出版年：2005
• 出版时间：June 2, 2005
• 年：2005
• 卷：109
• 期：21
• 页码：10695 - 10698
• 全文大小：94K
• 年卷期：v.109,no.21(June 2, 2005)
• ISSN：1520-5207

文摘

Photophysical properties of oligo(2,3-thienyleneethynylene)s (nTE, n denotes the number of thiophene rings,n = 2, 3) in benzene were investigated using steady-state, time-resolved fluorescence, and transient absorptionspectroscopies. For 2TE, generation of the radiative S₂ and nonradiative S₁ states was confirmed. Uponexcitation, the S₂ state was initially generated and deactivated to the S₁ state within 10 ps. The S₁ stateexhibited the transient absorption band at 470 nm, of which the lifetime was estimated to be 5.3 ns. In thecase of 3TE, on the other hand, it was revealed that the radiative S₁ state with a transient absorption peak at650 nm was generated upon excitation. The T₁ states of nTE were generated from the S₁ states. The quantumyields were estimated to be 0.52 and 0.54 for 2TE and 3TE, respectively. Extremely fast reactions in thehigher triplet excited state were indicated for both 2TE and 3TE.