The Study Of The Electron Transfer Between The Rare Earth Ions And Their Luminescent Properties In The Co-doped System

Rare earth luminescent materials are one of the most important types of the functionmaterial. They are attracting much attention due to potential and practical application. Onefound that the rare earth ions not only emit their own characteristic emission but also exhibitelectron transfer and energy transfer among conjugate rare earth ions in the co-doped system,then the abnormal valency rare earth ions and the sensitization are produced. Marcus foundedthe theory of the electron transfer, which provides the base for the theory study on the electrontransfer. So far, the study on the electron transfer between the rare earth ions in the co-dopedsystem is still limited. In this kind of system, the properties of the material are depended onthe matrix and the synthesis method. Nanostructured substances have attracted great interestbecause of their uniquely structural properties and advantage in physics and chemistry as wellas they was used as functional materials. It was a regret that this important kind ofluminescent material, which involved with rare earth ions, was not attached enough. We areinterested in all of these works so that a series of luminescent material which co-doped rareearth ions in the different matrix were prepared by different synthesis method. The opticalproperties of them were investigated through the study on the electron transfer. These resultscan establish credible foundation for further studying the potential applications inwhite-light-emitting trichromatic phosphor. In this thesis, the fluoride nanoparticles and thefluorides with doped rare earth ions nanoparticles were prepared by different methods. Theluminescent properties were investigated and establish credible foundation for furtherstudying the potential applications of fluorides doped rare earth ions in laser amplificationmaterials. The phosphors of M2B4O7 : Eu3+(M=Li, Na, K), MBPO5 :RE (M=Ca, Sr, Ba; RE=Eu, Tb,Ce) were synthesized by solid-state reaction for the first time; and the phosphors ofMBPO5:RE (M=Ca, Sr, Ba), BaBeF4: RE and SrMgF4: RE (RE = Eu, Tb) were alsosynthesized by mild hydrothermal method for the first time; furthermore, BaF2 nanoparticlesand BaF2:RE(RE=Eu, Tb, Er, Dy, Pr) nanoparticles were prepared by mild hydrothermalmethod which decentralized by macromolecule, microemulsion, microemulsion- solvothermalmethods. The microemulsions in (CTAB)/n-C4H9OH/n-C7H16/water were studied. They were characterized by means of X-ray powder diffraction, scanning electronmicroscopy, thermogravimetric analysis, infrared spectroscopy and inductively coupledplasma- atomic emission spectrometry. The luminescent properties were investigated by theluminescence spectrometer. The results show that many luminescent materials can be synthesized by solid-statereaction method and the optic properties are very well; among the solution processing routes,the hydrothermal process has been proposed to be an effective method not only for preparingdoped rare earth ions in oxide but also for synthesizing doped rare earth ions in complexfluorides, and the oxygenic content is very low in the fluorides; the soft chemical synthesismethods are the first choice for preparing the nanostructure materials with doped rare earthions, the most important method is microemulsion. The conditions were optimized because the synthesis condition effect strongly thestructure and properties. The electron transfer and energy transfer exist in the co-dopedsystem and the competition between them is occurred, which appeared different status in thedifferent system. The results show that the luminescent properties of these samples depend onthe structure, especially the mode of coordination. The results show that the nanoparticles, which doped rare earth ions, can be synthesizedby many techniques, and the method will be changed with the different doped rare earth ions.XRD confirmed that all the products are pure single phase. SEM show that BaF2:REnanoparticles are spherical particles and uniform grain. DTA-TG analysis and IR analysisshow that there are trace water, NO3 ions and...