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Photon trapping by the internal Bragg reflection of colloidal crystals

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Abstract

Fluorescence light emitted from photoexcited rhodamine 6G (R6G) doped in colloidal crystals of exhaustively deionized colloidal silica suspension is partially trapped within a crystal cage. This photon trapping is caused by Bragg reflection in crystal lattices. The photon trapping efficiencies were quantitatively examined as a function of the thickness of measurement cell. The efficiency increased from about 40 to 60% as the cell thickness increased from 1 to 10 mm for an R6G concentration of 5×10−6 mol/L. This result is attributed to an increase in the number of crystal layers perpendicular to the observation direction; these are formed in the cell with a large optical path length. On the other hand, the trapping efficiencies were constant irrespective of the angle between the incident and observed light of the cylindrical cells. The constant efficiencies are attributed to the fact that the heterogeneous crystal layers around the inner cell wall have the same thickness.

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Acknowledgements

Drs. M. Komatsu and M. Hirai of Catalyst & Chemical Ind. Co. (Tokyo, Japan) are thanked deeply for their providing the sample of the colloidal silica spheres. This research was partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (B), 60183076, 2004.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan

    Kiyoshi Shibata, Takayuki Yamamoto, Masahiko Kurita, Hiroshi Kimura & Akira Tsuchida

  2. Institute for Colloidal Organization, 3-1-112 Hatoyama, Uji, Kyoto 611-0012, Japan and Cooperative Research Center, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata, 992-8510, Japan

    Tsuneo Okubo

Authors
  1. Kiyoshi Shibata
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  2. Takayuki Yamamoto
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  3. Masahiko Kurita
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  4. Hiroshi Kimura
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  5. Akira Tsuchida
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  6. Tsuneo Okubo
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Corresponding author

Correspondence to Akira Tsuchida.

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Shibata, K., Yamamoto, T., Kurita, M. et al. Photon trapping by the internal Bragg reflection of colloidal crystals. Colloid Polym Sci 284, 688–693 (2006). https://doi.org/10.1007/s00396-005-1454-7

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  • DOI: https://doi.org/10.1007/s00396-005-1454-7

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