Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 222, Issue 1, Pages 56-63Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2011.05.001
Keywords
Aggregates; Organic-inorganic hybrids; Optical spectroscopy; Exciton theory
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Funding
- University of Cagliari
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The formation of fluorescent J aggregates in organic-inorganic Rhodamine 6G-silica hybrids is investigated in sot-gel prepared bulk samples in the concentration range of the transition from fluorescent to non-fluorescent aggregates (1.0 x 10(-4)-1.0 x 10(-3) mol/l). The spectral properties of the observed aggregates are studied by recording the excitation and emission fluorescence spectra and the fluorescence decay kinetics and analyzed in the exciton theory framework. The reported optical features depend both on the synthesis technique and the post synthesis treatments. It is shown that the geometry of fluorescent J aggregates can be modified from oblique to coplanar inclined configuration by thermal treatment of the samples. (C) 2011 Elsevier B.V. All rights reserved.
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