Luminescent hybrid materials functionalized with lanthanide ethylenodiaminotetraacetate complexes containing beta-diketonate as antenna ligands

作者：Aguiar Franklin P; Costa Israel F; Espinola Jose Geraldo P; Faustino Wagner M; Moura Jandeilson L; Brito Hermi F; Paolini Tiago B; Felinto Maria Claudia F C; Teotonio Ercules E S^*

来源：Journal of Luminescence, 2016, 170: 538-546.

DOI：10.1016/j.jlumin.2015.06.038

• Lanthanide ions
• Hybrid materials
• Photoluminescence
• Silica gel, beta-diketonate
• Energy transfer

Three organic-inorganic hybrid materials based on silica gel functionalized with (3-aminopropyl)trimethoxysilane (APTS), [3-(2-aminoetilamino)-propil]-trimetoxissilano (DAPTS) and 3-[2-(2-aminoetilamino)etilaminol propiltrimetoxysilane (TAPTS) and subsequently modified with EDTA derivative were prepared by nonhomogeneous route and were then characterized. The resulting materials named SiIXN-EDTA (X=1 for APTS, 2 for DAPTS and 3 for TAPTS) were used to obtain new lanthanide Ln(3+)-beta-diketonate (Ln(3+) =Eu3+, Gd3+ and Tb3+) complexes covalently linked to the functionalized silica gel surfaces (named SiIXN-EDTALn-dik, dik=tta, dbm, bzac and acac). The photophysical properties of the new luminescent materials were investigated and compared with those with similar system presenting water molecules coordinated to the lanthanide ions, SiIXN-EDTALn-H2O. The SiIXN-EDTAEu-dik and SiIXN-EDTATb-dik systems displayed characteristic red and green luminescence when excited by UV radiation. Furthermore, the quantitative results showed that the emission quantum efficiency (a), experimental intensity parameters Omega(2) and Omega(4), and Einstein's emission coefficient (A(OJ)) of the SiIXN-EDTAEu-dik materials were largely dependent on the ligands. Based on the luminescence data, the most efficient intramolecular energy transfer processes were found to the SiIXN-EDTAEu-dik (dik: tta and dbm) and SiIXN-EDTATb-acac materials, which exhibited more pure emission colors. These materials are promising red and green phosphors, respectively.

• 出版日期2016-2