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Two new complexes of Eu-bipyridine (Eu-AA and Eu-BB) were incorporated into sol–gel derived thin films based on zirconia oxide and organically modified sol–gel hybrid zirconia–silica–urethane ormocer (ZSUR).The absorption and the emission intensities of the composites were compared to the intensity of the Eu oxide doped films and to the other complexes studied recently. The site symmetry of the Eu...
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