Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 14, Issue 3, Pages 269-276Publisher
WILEY-BLACKWELL
DOI: 10.1002/adfm.200304462
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Dye-loaded AIPO(4)-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.
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