TIME-RESOLVED SPECTROSCOPY OF EUROPIUM $CHELATES^{\ast}$
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Date
1964
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Ohio State University
Abstract
Time-resolved fluorescence spectra of europium chelates have been recorded using the stroboscopic time resolution technique. These spectra show that the main emitting level $^{5}D_{0}$ of the europium ion is populated via the higher level $^{5}D_{1}$. The relaxation time of the level $^{5}D_{1}$ is measured to be of the order of $1-2 \mu s$. The data indicate that the mechanism of relaxation in chelates is similar to that responsible for non-radiative quenching in these compounds. The time-resolved spectra may also give further support to Crosby's theory of energy transfer via the triplet state in chelates.
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$^{1}$ Work supported in part by RADC under Contract AF 30(602)-2914.
Author Institution: Electro-Optical Systems, Inc., 300 North Halstead Avenue
Author Institution: Electro-Optical Systems, Inc., 300 North Halstead Avenue