Construction Of Luminescent Rare Earth Hybrid Materials And Thin Films By Modifying Functional Molecular Bridge

The main aim of this paper is to develop novel Organic-Inorganic hybrid materials and solid films with improved luminescent properties which can be used as high performed luminescent materials.Based on the coordinating ligands we synthesized coupling monomers with silicate coupling agents and then by sol-gel process and in-situ synthesis method we assemble the monomer and silicate matrix to hybrid materials. The materials combine the both properties of functional molecular and inorganic matrix. The obtained materials are improved in thermal stabilities, luminescent properties, single-phased. One route here used is modifying aromatic acid including benzoic acid, 2-benzylbenzoic acid, 2-furancarboxylic acid, 2-bromophenylacetic acid, 2-pyrazinecarboxylic acid, phenylmalonic acid and tert-butylbenzoic acid. Deriving from conjugated Ï€ bonds these ligands can be good sensitizer to rare earth ions. Firstly aromatic acids are used to react with SOCl₂ and then the purified products are used to react with silicate coupling agents such as (3-aminopropyl)triethoxysilane. The got products are used as precursors to co-hydrolysis and co-condensate with crossing agents such as tetraethoxysilane. During the sol-gel process the functional molecular are covalently bonded to Si-O networks. The final materials exhibit excellent luminescent properties and these molecular hybrids form single phase to get good physical properties.In the experiments sol-gel method and in-situ synthesis method are used. Sol-gel technology is the one of the most versatile methods for the preparation of inorganic-organic hybrid materials for its low processing temperature, which allows the incorporation of luminescent species into host matrix through the hydrolysis and polycondensation. And it also can shorten the reaction time. Begun with soluble precursors, the reactants can be mixed in the scale of molecular and the ratio also can be controlled which is very helpful for the formation of materials. Regular structures of these materials lead to good properties of the materials.The other route here we synthesis hybrids is modifying hydroxyl of ligands by 3-(triethoxysilyl)-propyl isocyanate to get coupling monomers. The ligands used are 3, 5-dihydroxybenzoic acid and 8-hydroxylquinoline. After the addition reaction of-OH and -N=C=O, the got monomer can be used as precursors to co-hydrolysis and...