Europium acetylacetonate is a coordination complex with formula Eu(C5H7O2)3.

Although this anhydrous acetylacetonate complex is widely discussed,[2] some sources suggest that it is really the dihydrate Eu(C5H7O2)3(H2O)2.

[3][4] Upon attempted dehydration by heating under vacuum, the dihydrate converts to the oxo-cluster Eu4O(C5H7O2)10.

[5] The electronic structure of the Eu3+ core gives the complex an unusual charge-transfer band absent in other lanthanide acetylacetonates.

[7] Doping a blend of polyacrylate and polycarbonate with europium acetylacetonate enhances photoluminescence over a broad range of ultraviolet wavelengths.