Formation of fluorescent aggregates in Rhodamine 6G doped silica glasses |
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| Institution: | 1. Department of Physics, University of Cagliari, Cittadella Universitaria, S.P. no. 8, I-09042 Monserrato (Cagliari), Italy;2. Department of Physical Chemistry, University of Pavia, INSTM, and IENI-CNR, V.le Taramelli 16, I-27100 Pavia, Italy |
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| Abstract: | The photoluminescence properties of type I sol–gel synthesized Rhodamine 6G doped silica samples were investigated in the 1.5 × 10?4–1.5 × 10?3 mol/l range of concentration by means of steady-state and time resolved photoluminescence measurements. The emission peak red shifts as the concentration increases. For a fixed concentration, the peak position also red shifts as the excitation wavelength decreases. The observed spectroscopic features, including excitation of photoluminescence and decay time, indicate the formation of fluorescent dimers. |
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