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Abstract

In comparing emissions of the inorganic Eu³⁺ 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 Eu³⁺ 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 ⁵D₀ excited state of Eu³⁺ to the first five levels of the ⁷F ground manifold. The present research examines the luminescence behavior of EuCl₃ 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 ⁵D₀, emission from the ⁵D₁ excited state of Eu³⁺ is observed for the first time.

Keywords

Room temperature Luminescence Sol-gel glass Organoeuropium

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Observation of Room-Temperature 5 D 1 Luminescence of an Organoeuropium Complex Encapsulated in Sol-Gel Glass

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