Energy Transfer among Three Dye Components in a Nanosheet–Dye Complex: An Approach To Evaluating the Performance of a Light-Harvesting System

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• 作者：Yuta OhtaniShintaro Kawaguchi ; Tetsuya Shimada ; Shinsuke Takagi
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：February 2, 2017
• 年：2017
• 卷：121
• 期：4
• 页码：2052-2058
• 全文大小：405K
• ISSN：1932-7455

文摘

Energy transfer among three dye components, namely, p-2,4,5,7-tetrakis(N-methylpyridinium-4-yl)-6-potassium-oxy-3-fluorone (Fluorone), meso-tetra(N-methyl-3-pyridyl) porphine (m-TMPyP), and meso-tetra(N-methyl-4-pyridyl)porphine (p-TMPyP), was investigated for the purpose of utilizing a wide range of sunlight wavelengths for clay nanosheets. In this paper, we define a new parameter, the enhancement ratio of the excitation frequency (Γ_{380–780 nm}) of the dye, in order to comprehensively represent the performance of the light-harvesting system (LHS). Γ_{380–780 nm} is defined as the enhancement ratio of the excitation frequency of dye that has the lowest excitation energy in the system (p-TMPyP in this system) in terms of the frequency of p-TMPyP without the use of light-harvesting dyes (Fluorone and m-TMPyP), when the visible-light region of sunlight (380–780 nm) is used for irradiation light. Γ_{380–780 nm} was calculated from the absorption spectra of dyes, the results of energy transfer experiments, and the sunlight spectrum (380–780 nm). We found that Γ_{380–780 nm} in our LHS is 2.4, which implies enhancement of the excitation frequency of p-TMPyP by 2.4 times relative to that of p-TMPyP without a light harvesting system. We believe that Γ_{380–780 nm} is an important standard parameter of the performance of artificial LHSs.