Highly quantum efficiency trinuclear Eu3+ complex based on tris-diketonate ligand

A trinuclear Eu-complex based on tris-(β-diketonate) ligand was firstly designed and synthesized. The complex was characterized using IR, FAB-MS, 1H NMR, UV–visible, photoluminescence (PL) spectroscopy, element analysis (EA) and thermogravimetic analysis (TGA). Due to the contribution of two additional Eu3+ lumophors in the trinuclear Eu-complex, the complex exhibited much longer lifetime and higher quantum efficiency than mononuclear Eu-complex Eu(TTA)3phen. The CIE chromaticity coordinates (x = 0.66 and y = 0.33) showed a dominant wavelength of 613 nm, the color gamut achieved by this trinuclear Eu-complex was a 100% in the CIE color space. In addition, the trinuclear Eu-complex exhibited excellent thermal stability.