Photoluminescence analysis for terbium β-diketonate complex-based silica xerogel matrices

Abstract

In this work, luminescent complex, terbium (III) bdiketonate (C 24 H 16 F 9 O 8 S 3 Tb), was prepared and incorporated into silica matrix by ordinary sol-gel method. The starting precursor which provide silica matrices was tetraethyl orthosilicate (SiOC 2 H 5 ) 4 . The experimental conditions have been adopted, so that the sample formation via sol-gel route was started at neutral pH, whereas the final pH value was normalized to three before reaching gel point. The spectroscopic analysis of terbium b-diketonate complexes-based xerogel matrices as a function of Tb ?3 concentrations has been realized using UVvisible absorption, (FTIR) spectroscopy and luminescence measurement. The luminescence behavior of Tb 3? ions can be improved in such matrices. The complex can be incorporated into the silica matrix at the same time as the hydrolysis and condensation reaction of the silanes start. The green emission of Tb 3? ions at 544 nm was clearly observed and indicates the good stability of Tb complex in silica sol-gel matrices. Graphical AbstractKeywords Sol-gel Á Silica matrix Á Terbium b-diketonate complex Á Luminescence

Investigation of the Chemistry for the Host Sol‐Gel Glass via the Energy Transfer Fluorescence of Encapsulated Organic‐Tb(III) Complexes

“…Researchers have a great interest in rare earth organic complexes due to their unique fluorescence properties and promising applications as fluorescence probes and laser materials. [1][2][3][4][5][6][7] Due to the fact that lanthanide ions themselves exhibit low molar absorptivity, the design of complexes between them and organic ligands that absorb light and transfer the energy to the metal center (antenna effect) is a common practice. [8,9] The increase in the absorptivity of the ligand generally improves the luminescence intensity of the complex.…”