Synthesis and characterization of ZrO2:Eu nanopowder by EDTA complexing sol–gel method

Synthesis of zirconia nanopowders from various zirconium salts via polyacrylamide gel method

“…13 Sol-gel method is mostly used in order to obtain high purity, homogeneity and well controlled properties. The complex sol-gel process, a modified Pechini method, is a polymerized 14 This method is based on the formation of a solid polymer resin with cations chelated on it in a homogeneous manner. Cations in solution with a hydroxycarboxylic acid (e.g.…”

“…This method has been previously applied for the preparation of different zirconia based powders such as yttria-stabilized zirconia 16,17 and ZrO 2 :Eu nanopowders using EDTA as complexing agent. 14 Polyacrylamide gel method is a new improvement of the previous synthetic routes, in which a solution of the respective cations is soaked. In this method, direct pyrolysis of polymeric network without separate drying step yields very fine and highly dispersed powders.…”

Blue luminescence of nanocrystalline CaZrO3:Tm phosphors synthesized by a modified Pechini sol–gel method

“…This broad emission band was assigned to the emission of selfactivated (SA) defect center of CaZrO 3 . This kind of emission existed in many semiconductors, such as SnO 2 [17] and ZrO 2 [26]. Another point is that the luminescent intensity ratio of 1 G 4 -3 H 6 to 3 P 0 -3 F 3 transitions (0.863) is bigger than that in the emission spectrum excited by 208 nm (0.331).…”

Synthesis and Thermoluminescent Characterization of Ceramics Materials

“…The optimization of the luminescent properties of phosphors, varying their nanostructure, is a subject which has certainly not been fully investigated up to now. It is nevertheless clear that the excitation energy, the surface defects, the efficiency of light extraction and the interface between the phosphor grains and their environment are parameters which are affected by the nanostructure of the material (Azik et al, 2008;Zhang et al, 2005;Wang et al, 2005). This influence is enhanced for small grain sizes, giving a real motivation for the synthesizing phosphors with dimensions of their microstructure closer to the nanometer size range.…”

“…There is a need both for the optimization of microscopic electronic properties and for the separate control of bulk optical parameters on the scale of optical wavelengths (Lee & Rainforth, 1994). In the last years most of the work done in the Flat Panel Displays (FPD) area has been focused to the development of luminescent films based oxides of high quality, that can be applied as optically active layers in photoluminescent, cathodoluminescent and luminescent devices, for this purpose it is necessary to obtain flat and transparent films in order to obtain a device with a good resolution, contrast and efficiency characteristics (Chacon et al, 2008;Zhang et al, 2005). The optical ceramic preparing techniques were successfully developed in past years; the production of the transparent ceramic from ceramic nanopowders has high importance (Garcia et al, 1997;Gutzov & Lerch, 2003).…”