Preparation and luminescent properties of silica-based composite materials encapsulating a novel terbium complex

摘要

Silica-based composite materials encapsulating luminescent terbium complex of a new podand-type polyaromatic acid ligand, 3,6-bis [(4'-carboxyphenoxy)methyl]-1,2,4,5-tetramethylbenzene (H_2BCM), SiO_2:Tb_2(BCM)_3 was prepared by the sol-gel process. For the SiO_2:Tb_2(BCM)_3 composites, the energy transfer from the ligand to Tb ions took place smoothly, as for the original complex, and consequently strong green emission based on Tb~(3+) was observed. Compared with the complex itself, the unit-mass luminescence intensity of the composite material is enhanced 16 times. In addition, concentration effects on the luminescence intensity were investigated.