Construction Of Luminescent Rare Earth Covalently Bonded Hybrid Materials By Modifying Bridged Molecules

The main aim of this paper is to develop novel Organic-Inorganic hybrid luminescent materials with improved luminescent properties which can be used as high performed luminescent materials.In the first part of this paper, the study mainly concentrated on the syntheses of organic-inorganic molecular-based hybrid luminescent materials with the two components equipped with covalent bonds. The organic components (aromatic acids or (3-diketone) which can sensitize rare earth ions fluorescence were modified by coupling agents and then the organic monomers with double reactivity were obtained. It is summarized that antenna effect existed between double functional molecules and rare earth ions and enhanced luminescence of the hybrids which are compared with common physical mixture were obtained. Furthermore, the increase of rare earth concentration was enormous. It is the first time to observe a large amount of chains-like structures probably caused by crystal growth in the SEM graphs of 4-ethoxy benzoic acid.In the second part of this paper, the study mainly concentrated on the syntheses of luminescent materials with covalently bonded mesoporous host. And characterization of the materials by XRD, N₂ adsorption/desorption and SEM revealed high crystallinity, uniformity in the mesopore structure, and a high surface area. Additionally, β-diketone molecule with high energy transfer efficiency was firstly grafted by cross-linking agent and luminescent materials with covalently bonded mesoporous host were obtained by using it to modify MCM-41. And various experimental data indicated that it can heavily strengthen the photo- or thermal stability of complexes to introduce β-diketone molecules into MCM-41.