Preparation And Luminescent Properties Of The Composite Films Of Rare Earth And LDHs

Hydrotalcite composite film which has many advantages of LDHs subject and object molecule is a kind of excellent functional material,therefore we prepared composite film by intercalation between organic molecules with optical activity and LDHs.The films can be used in sensor,photoelectric diode,display device,LED lights and other various optical devices.At the same time,the rare earth complex is a kind of excellent luminescent material,which has the characteristics of high purity and high luminous efficiency.It plays an important role in biological analysis and fluorescence material.The study found that the resulted assembly of composite light-emitting materials through the introduction of the rare earth complexes into various matrices can not only improve the luminescence properties of rare earth complexes but also can obtain a variety of functional materials.In this paper,we focus on the two tasks: firstly,used rare earth coordination compounds and layered LDHs to prepare luminescent thin film based on chemical adsorption via layer-by-layer self-assembly method;Secondly,utilized rare earth doped LDHs and organic ligands to prepare luminescent thin film based on coordination bond by the same method.1.We choose the MgAl-LDHs as host material and the rare earth complexes of β-cyclodextrin as the guest to prepare the multilayer ordered luminescent films.The resulted films are very transparent and uniform.The thickness and the fluorescence intensity of the films increase with the increasing of the number of the deposition.The research shows that the rare earth complexes can be self-assembled by alternating deposition of LDHs.The fluorescence properties are improved.2.The ultraviolet absorption coefficient of the organic ligand is large,which can absorb ultraviolet radiation and transfer to the rare earth ion.When the rare earth ions are sensitized by organic ligand,the luminous efficiency can be greatly improved.In our work,MgAlLDHs and organic ligands were designed to prepare luminescent thin films,and the organic ligand solutions were compared.