Synthesis and luminescent properties of europium complexes

Europium (Eu) complexes with β-diketone ligands have been synthesized and characterized using luminescence spectroscopy. Complexes with fluorene show high fluorescence in THF solution and exhibit sharp emission peak at 615 nm. We have improved the energy transfer from the blue-emitting material (host) to the Eu complex (guest) by the synthesis of a new Eu complex which exhibits an absorption peak at lower energy with respect to the emission energy of the host. With respect to volatility, since some thin films of the complexes were not formed easily by vapour deposition, we have examined the thermal properties of the Eu complexes with phenanthroline derivatives. We discuss the efficiency of the energy transfer and volatility of these complexes.