Panchromatic Chromophore Mixtures in an AlPO4-5 Molecular Sieve: Spatial Separation Effects and Energy Transfer Cascades
Dye‐loaded AlPO4‐5 single crystals were prepared by microwave‐assisted hydrothermal synthesis from a batch, containing a mixture of three chromophores (Coumarin 40, Rhodamine BE50, and Oxazine 1) differing in their absorption range, molecular dimensions, and solubilities. Confocal fluorescence image...
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Published in | Advanced functional materials Vol. 14; no. 3; pp. 269 - 276 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
01.03.2004
WILEY‐VCH Verlag |
Subjects | |
Online Access | Get full text |
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Summary: | Dye‐loaded AlPO4‐5 single crystals were prepared by microwave‐assisted hydrothermal synthesis from a batch, containing a mixture of three chromophores (Coumarin 40, Rhodamine BE50, and Oxazine 1) differing in their absorption range, molecular dimensions, and solubilities. Confocal fluorescence images reveal a spatial separation effect of the dye molecules, where the slimmer, more‐soluble dye molecule (Coumarin 40) is uniformly distributed in the body of the single crystal, and the bulky and/or less‐soluble ones (Rhodamine BE50, Oxazine 1) are situated in distinct domains. Visible spectra show good panchromatic absorption of visible light. Fluorescence lifetime measurements indicate the presence of an energy transfer cascade of the entirely fixed dye molecules from Coumarin 40 to Oxazine 1. The transfer mechanism is predominantly radiative.
Energy transfer between different dyes in a molecular sieve (as shown in the Figure) is studied. Coumarin 40, Rhodamine BE50, and Oxazine 1 were incorporated in one step during hydrothermal synthesis of AlPO4‐5. The incorporation of dyes absorbing and emitting light at different energies enables a good panchromatic uptake of visible light. The predominant energy transfer mechanism is radiative. |
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Bibliography: | ark:/67375/WNG-NT3RG5FT-D istex:342148F2EF67CB225B19BE82DD73777959B4D7F8 ArticleID:ADFM200304462 The authors are indebted to Dr. K. Hoffmann for the polarization dependent absorption spectra of dye-loaded AlPO4-5 single crystals (Institut für Angewandte Chemie, Berlin). Support by the Volkswagen Foundation under the grant I76160 is gratefully acknowledged. The authors are indebted to Dr. K. Hoffmann for the polarization dependent absorption spectra of dye‐loaded AlPO4‐5 single crystals (Institut für Angewandte Chemie, Berlin). Support by the Volkswagen Foundation under the grant I76160 is gratefully acknowledged. ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1616-301X 1616-3028 |
DOI: | 10.1002/adfm.200304462 |