Europium acetylacetonate is a coordination complex with formula Eu(C<sub>5</sub>H<sub>7</sub>O<sub>2</sub>)<sub>3</sub>. Although this anhydrous acetylacetonate complex is widely discussed, some sources suggest that it is really the dihydrate Eu(C<sub>5</sub>H<sub>7</sub>O<sub>2</sub>)<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>.
Upon attempted dehydration by heating under vacuum, the dihydrate converts to the oxo-cluster . This behavior is also observed for gadolinium acetylacetonate, yttrium acetylacetonate, lanthanum acetylacetonate, and erbium acetylacetonate.
The electronic structure of the core gives the complex an unusual charge-transfer band absent in other lanthanide acetylacetonates. The photoluminescent emission lines occur near 465 (blue), 525 (green), and 579 nm (yellow), and are unusually sharp, especially the yellow doublet. Doping a blend of polyacrylate and polycarbonate with europium acetylacetonate enhances photoluminescence over a broad range of ultraviolet wavelengths. EuFOD is a substituted derivative.