Enhancement of electronic excitation energy transfer in the colloidal crystals of colloidal silica suspensions doped with fluorescent dyes |
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| Authors: | Kiyoshi Shibata Hiroshi Kimura Akira Tsuchida Tsuneo Okubo |
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| Institution: | (1) Faculty of Engineering, Department of Applied Chemistry, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan;(2) Institute for Colloidal Organization, 3-1-112 Hatoyama, Uji, Kyoto 611-0012, Japan;(3) Cooperative Research Center, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan |
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| Abstract: | The efficiency of electronic excitation energy transfer from photo-excited rhodamine 110 (Rh110, energy donor) to rhodamine B (RhB, energy acceptor) in an exhaustively deionized colloidal silica suspension has been studied. This colloidal suspension shows Bragg reflection due to the formation of colloidal crystals and the Bragg-peak wavelength is controllable by the volume fraction of the silica spheres. When the Bragg-peak wavelength matches with the fluorescence band of Rh110, a depletion was observed in the Rh110 fluorescence spectrum. This means the fluorescence of Rh110 is partially trapped due to the Bragg reflection inside the crystal lattice. In the coexistence of RhB, the enhancement of RhB fluorescence intensity was observed. These facts clearly indicate the trapped photon energy of Rh110 is efficiently transferred to RhB within the colloidal crystals. The quantitative measurements showed that the enhancement of the transfer efficiency is 20% (or slightly more) in the present experimental conditions. |
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| Keywords: | Colloidal crystals Photon trapping Electronic excitation energy transfer Bragg reflection Fluorescence spectra |
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