Synthesis and photophysical properties of ternary ?-diketonate europium(III) complexes incorporating bipyridine and its derivatives

Two new octa-coordinated ternary europium(III) complexes of the type [Eu(btfa)3(Br2-bpy)] (Eu-1) and [Eu(btfa)3(PhE2-bpy)] (Eu-2) (where btfa = 4,4,4-trifluoro-1-phenyl-1,3-butanedione, Br2-bpy 5,5?-dibromo-2,2?-bipyridine, PhE2-bpy 5,5?-bis(phenylethynyl)-2,2?-bipyridine) together with a previously reported complex [Eu(btfa)3(bpy)] (Eu-3) have been synthesized. The characterized by analytical spectroscopic methods. photophysical properties also analyzed both experimentally theoretically. contribution each ligand to sensitized Eu(III) photoluminescence (PL) has is discussed. An energy transfer (ET) mechanism proposed discussed for emission using experimental theoretical data. incorporating parent bpy showed impressive performance as double-emitting layer (EML) red organic light emitting diodes (R-OLEDs).