Photophysical properties of ternary RE3+ (RE = Eu, Tb, Sm) hybrids with β-diketone functionalized linkages and 4-(4-nitrostyryl)pyridine though coordination bonding.

In this paper, the organic ligands TTA and TAA are grafted onto the coupling agent to achieve the organic precursors (TTA-Si, TAA-Si) as first ligand and the organic 4-(4-nitrostyryl)pyridine (Nspy) is synthesized as the second ligand. Both of them are coordinated to the rare ions with the carbonyl group and nitrogen atom respectively. After the hydrolysis and copolycondensation between the teraethoxysilane (TEOS) and the ternary rare earth organic complex via the sol-gel process, the chemical bonded hybrid materials are constructed and characterized in detail. The obtained hybrid materials present superior thermal stabilities and regular and homogenous square blocks microstructure. Among the hybrids Eu(TTA-Si)(3)Nspy shows a more strong characteristic emission and longer lifetime than the hybrids Eu(TAA-Si)(3)Nspy, while hybrids Tb(TAA-Si)(3)Nspy exhibits the stronger characteristic emission and longer lifetime than the hybrids Tb(TTA-Si)(3)Nspy. For Sm(3+) hybrid materials, the photoluminescence of Sm(TAA-Si)(3)Nspy is too weak to find in the characteristic emission spectra, meanwhile, Sm(TTA-Si)(3)Nspy has the excellent luminescent intensity.