Efficient Emission from Ligand-dendron Functionalized Europium Complexes

Li Shangfeng, Zhu Weihong, Pan Jianfeng, Xu Zhongyu, Tian He^*
(Institute of Fine Chemicals, East China University of Science &Technology, Shanghai 200237)

Abstract Novel dendron-like europium complexes Eu(BPPD)₃(Phen) and Eu(BCPD)₃(Phen), whose ligands contain unsymmetrical diphenyl b-diketone and phenanthroline, have been synthesized. The structure characteristic is that the carrier transporting carbazole units are incorporated into the ligands via dendron functionalization. The two complexes exhibit strong red-light luminescence with narrow half-peak-width located at 613nm in solid state or solution. Furthermore, comparing to the reference complex Eu(BPPD)₃(Phen), the solid state luminance intensity of Eu(BCPD)₃(Phen) is increased by 5.7 times, which can be attributed to the light-harvesting antenna effect of carbazole units and F?rster singlet energy transfer.
Key words Dendron-like, Europium complexes, Luminescence, Carbazole