EFFECT OF THE ENVIRONMENT UPON THE FLUORESCENCE LIFETIMES AND SPECTRA OF $Sm^{3+}$ IN $POCl_{3}:SnCl_{4}$
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Date
1972
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Ohio State University
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.
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Author Institution: Department of Chemistry, The University of Toledo