Novel β-diketonate complexes of Eu3+ bearing pyrazole moiety for bright photo- and electroluminescence

Four novel 1,3-diketonate Eu3+ complexes bearing pyrazole moieties as main ligands and a 4,7-Diphenyl-1,10-phenanthroline (bathophenanthroline) ancillary ligand were synthesized. The number of fluorine atoms in the main ligand was varied from 3 to 13. From spectroscopic studies of the synthesized complexes we conclude that increasing the degree of fluorination results in a significant rise in the quantum yield and sensitization efficiency. With...