Abstract
In comparing emissions of the inorganic Eu<sup>3+</sup> salts (chloride or nitrate) to organoeuropium complexes doped into optically transparent sol-gel glass, previous studies have indicated that changes in the local chemical environment by chelation or variation of the ligand or gel matrix compositions were found to leave the main spectral features of Eu<sup>3+</sup> essentially unchanged; complexation just increases the emission intensity of europium and leads to broadening and splitting of the peaks. In all cases studied and irrespective of the excitation energy, the observable emission peaks result only from relaxations out of the <sup>5</sup>D<sub>0</sub> excited state of Eu<sup>3+</sup> to the first five levels of the <sup>7</sup>F ground manifold. The present research examines the luminescence behavior of EuCl<sub>3</sub> and Eu-TETA (TETA is the macro cycle, 1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetraaceticacid) doped into a sol-gel host; in addition to emissions from the <sup>5</sup>D<sub>0</sub>, emission from the <sup>5</sup>D<sub>1</sub> excited state of Eu<sup>3+</sup> is observed for the first time.
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