High-yield luminescence of a novel homonuclear europium complex by excimer excitation absorption

A novel europium complex, Eu2(TDAP)(DBM)6(Phen)2 (TDAP=terephthaloyl-diacetophenone, DBM=dibenzoyl methane, and Phen=1,10-phenanthroline), has been designed and synthesized. Excellent red luminescence from the Eu3+ complex was observed excited at 434 nm, and the broad visible excitation band is attributed to excimer absorption. The luminescence quantum yield excited at 434 nm (54±5%) was great higher than that at 380 nm (35±3%). This is the first time to find strong and high-yield excimer excitation absorption for a europium complex at room temperature, therefore, the excimer absorption band located in visible region (400–500 nm).