# EFFECT OF THE ENVIRONMENT UPON THE FLUORESCENCE LIFETIMES AND SPECTRA OF $Sm^{3+}$ IN $POCl_{3}:SnCl_{4}$

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 dc.creator Tokousbalides, P. en_US dc.creator Chrysochoos, J. en_US dc.date.accessioned 2006-06-15T13:33:10Z dc.date.available 2006-06-15T13:33:10Z dc.date.issued 1972 en_US dc.identifier 1972-P-8 en_US dc.identifier.uri http://hdl.handle.net/1811/9091 dc.description Author Institution: Department of Chemistry, The University of Toledo en_US dc.description.abstract The environment has a pronounced effect upon the emission spectra and the fluorescence lifetimes of $Sm^{3+}$ in $POCl_{3}:SnCl_{4}$ whereas its effect upon the absorption spectra is less marked. At constant concentration of $Sm^{3+}$ both the fluorescence lifetimes of $Sm^{3+}$ and the fluorescence efficiency increase as the ratio $[POCl_{3}]/[SnCl_{4}]$ decreases. Maximum lifetimes obtained at low $[Sm^{3+}]$ approach a limiting vlaue of 3.31 msec. On the other hand maximum fluorescence efficiency is attained at an optimum ratio of 89:11. Fluorescence and absorption spectra of $Sm^{3+}$ in $POCl_{3}:ZrCl_{4}$ exhibit similar dependence upon the environment. The fluorescence efficiency of $Sm^{3+}$ in the aforementioned solvents is enhanced considerably at slightly lower temperatures; i.e., it is enhanced by a factor of 3 if the temperature is lowered from $25^{\circ}C$ to $5-10^{\circ}C$. Self-quenching rate constants have been determined via both the fluorescence lifetimes and the fluorescence spectra. This project was supported by Owens-Illinois, Corporate Research Laboratories. en_US dc.format.extent 122819 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.title EFFECT OF THE ENVIRONMENT UPON THE FLUORESCENCE LIFETIMES AND SPECTRA OF $Sm^{3+}$ IN $POCl_{3}:SnCl_{4}$ en_US dc.type article en_US