Europium, terbium-doped phosphor down-conversion Preparation and Properties

Title: Europium, terbium-doped phosphor down-conversion Preparation and Properties
Author: Ran Miao Committee
Degree-granting unit: Zhengzhou University
Keywords: CaF_2;; Eu;; terbium;; doping;; nm;; fluorescent material
Summary:


Over the years, it has not stopped the development of new luminescent materials and explore. The unique electronic structure of rare earth ions, so that rare-earth doped luminescent materials have photochemical stability, and long fluorescence lifetime, quantum yield, narrow emission spectra, Stokes shift and large distinct advantages. Therefore, lanthanide-doped Neodymium magnets luminescent materials has been one focus of research. Eu3, Tb3 red and green phosphors are most commonly used activator of the most important, is that people study the focus of attention. This paper mainly for europium, terbium-doped phosphor down-conversion and water-soluble preparation of some work, the main contents are summarized as follows:


1 for methanol as reaction solvent, co-precipitation method, without using any surfactant in the case, the system had hydrophilic CaF2: Ln3 nanoparticles, these particles can be well dispersed in water, and the particle distribution, average diameter of about 20nm, no agglomeration. This method is simple, reproducible, high yield, very suitable for mass production.


(2) were used polyvinylpyrrolidone (PVP) and citric acid as a surfactant, co-precipitation method and hydrothermal method had hydrophilic CaF2: Ln3 nanoparticles, these particles can be well dispersed in water, and a detailed study of its structure and fluorescent properties.


3 usually spherical CaF2: Eu3 particles difficult to obtain, through this paper TEOS catalyzed hydrolysis of monodisperse spherical SiO2 particles, and then under the action of other active agent, coated on its surface a layer with fluorescent properties of CaF2: Eu3, so that the system had a spherical light-emitting materials, but also saves rare earth elements.


4 synthesized by hydrothermal method and PO43-ions Eu3 codoped CaPxW1-xO4: Eu3 nano-materials by XRD, TEM, and fluorescence spectroscopy http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php show that the particle is a typical scheelite structure; morphology was rod; PO43 - ion incorporation can effectively adjust the spectral intensity, changing the doping concentration of PO43-ion emission intensity of fluorescence obtained in different materials.
Degree Year: 2010