Synthesis And Characterization Of Luminescent Polymeric Colloidal Crystals Containing Rare Earth Complexes

With the rapid development of the modern science and technology, materials of single property can not satisfy human beings'needs any longer. The modern materials'development trends to be complex,less dimensional and intelligent. Combining the functions of two or more kinds of materials could be able to prepare functional materials with excellent characteristics. Colloids and latexes have been attracting considerable attention for their importance in the fields of colloidal science, chemistry, material sciences and biology in the modern science and technology. Especially, colloidal particles and composite colloidal particles with desired properties and their self-assembled systems have recently been an important and hot point in the colloid sciences. Thanks to many years of continuous efforts, a variety of colloids and composite colloids have already found a broad range of fascinating applications in fields of drug delivery, biodiagnostics and optoelectronic materials and so on. As an important aspect, the formation highly ordered structures (photonic crystals and colloidal crystals) resulted from the self-assembly of monodispersed colloidal particles have been an intriguing subject of researches over the past several decades.Rare earth elements display particular luminescent property for the feature of their own 4f electronic structure: for instance, they have narrower emission spectrum and higher luminescent efficiency. As the rare earth organic complexes combine with polymers comparatively easier than the inorganic complexes, and what is more, the rare earth organic complexes could distinguishedly enhance the characteristic fluorescence emission via efficient molecular inner energy delivery, they are considered to be a sort of photoluminescence and electroluminescence materials which show prosperous expansion foreground. On the other hand, the polymers have some kinds of merits like molecular structure which tend to design, nicer mechanics and optics features and so on as a group of substrate materials. Therefore link the rare earth organic complexes and polymer together can prepare functional luminescent polymer materials which possess eminent characters.In this paper, we synthesized bonding-type rare earth organic complexes. Bonding-type organic complexes have been determined by FT-IR, UV-Vis spectrum, the polymeric reactivity groups(–C=C) were introduced into the formula structure of complexes. An intense fluorescence emission was observed under the excitation of UV light at room temperature by PL spectrum. 1,10-phenanth- roline is a conjugate ligand and possesses of rigid and sameside rings which make the structure of complexes stable. Through TGA analyses, the rare earth complexes show high decompound temperatures, which indicates a good thermal stability and benefit to intermingle with polymer.Then the rare earth organic complexes were copolymerized with the styrene monomers via an emulsifier-free, in order to prepare the monodisperse polystyrene nanospheres which exhibit excellent luminescence properties. The obtained polystyrene nanospheres have got carboxyl and amino accompanied on their surfaces. And we can gain their diameters from scores of nanometers to hundreds ofnanometers by means of changing the rate of the styrene monomers and the functional monomers. Through the SEM,laser particle size instrument analysis ,we confirmed that the surface of the nanoparticles are smooth,clean and their monodisperse is narrow. It would be supply the building lattices with constructing the next colloidal crystals abundantly.And next, to utilize the polymer microspheres, the corresponding polymer colloidal crystals which have luminescence properties were fabricated by vertical deposition and physical domain constraint methods on one and more dimension orientations. By the aid of AFM,SEM and fluorescence microscope analysis we characterized the colloidal crystals'stacked mode,compact arrangement,period size and the defect structure and so on. At the meantime we investigated the fluorescence emission quality and the photon forbidden band of the colloidal crystals by the measure of PL,UV-Vis spectrum analysis. Moreover we have attained a kind of colloidal crystals that may absorb photon and emit fluorescence in the same wavelength by adjusting the size of the polymer nanospheres which is used to build blocks. It will display latent application foreground in the fields of photon and electron.