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Multiple Fluorescence Spectra of Fluorescein Molecules Encapsulated in the Silica Xerogel Prepared By the Sol-Gel Reaction

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The fluorescence and fluorescence-excitation spectra of fluorescein molecules during the sol-gel-xerogel transitions of tetraethyl orthosilicate (TEOS) solutions have been observed as functions of doped concentration, in the order of 10-2 and 10-5 mol dm-3, and of the sol-gel-xerogel transition time. It was shown that with a lower initial concentration only the cation was encapsulated in the pores of the silica xerogel state during the sol-gel reaction processes. On the other hand, with a high concentration four species, i.e., cation, monoanion, dianion, and dimer, were encapsulated in the silica xerogel during the sol-gel reaction processes. These results have the potential to open the way to the development of simultaneous multiple-band solid-state laser emitting materials.

Affiliations: 1: Department of Chemistry and Materials Engineering, Faculty of Engineering, Shinshu University, Wakasato, Nagano 380, Japan; 2: Department of Applied Chemistry, University of Osaka Prefecture, Sakai, Osaka 593, Japan


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