Study on Different Synthesis Methods of Spherical YAG:Ce3+ Phosphor and its Luminescence Properties

2015 ◽  
Vol 1088 ◽  
pp. 371-376 ◽  
Author(s):  
Xia Zhang ◽  
Cui Xia Yan ◽  
Rong Feng Guan
Keyword(s):  
Sol Gel ◽  
Spherical Particles ◽  
Luminescence Properties ◽  
Precipitation Method ◽  
Thermal Method ◽  
Synthesis Methods ◽  
Processing Parameter ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Precipitation

Spherical YAG:Ce3+phosphors were synthesized by three different routes namely sol-gel method, co-precipitation method and solvethermal method. The microstructure, crystallization and luminescent properties of the phosphors were studied in order to find the best processing parameter for spherical shape and good luminescence properties of YAG:Ce3+phosphor. Adding citric acid to the precursor solution resulted in the formation of spherical particles in sol-gel method. YAG:Ce3+phosphor made by co-precipitation method was separated with PEG2000, and its spherical particles of size was around 500nm. The hydro-thermal method could get perfect spherical appearance, but it needed heat treatment improve the luminescence property.

Effect of Synthesis methods on the Properties of Magnetic Material

2015 ◽  
Vol 10 (1) ◽  
pp. 2566-2582
Author(s):  
Anwar Ul Haq ◽  
Farwa Mushtaq ◽  
M. Anis-ur-Rehman
Keyword(s):  
Sol Gel ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Basic Material ◽  
Synthesis Methods ◽  
Hydraulic Pressure ◽  
Phase Purity ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Precipitation

Ba1-xPbxFe12O19 composition (x=0.0 to 1.0) synthesized by Co-precipitation and Sol-Gel  methods. In Co-precipitation method BaCO3, PbO and Fe (NO3)3 .9H2O were used as basic ingredients. Acids and Di-H2O  were used as solvents. Molar ratio of cations was 12.   pH of solution kept constant at 13.  All samples sintered at 965±5oC for three hours.  Lead own properties, synthesis at room temperature and substitution in R-block of structure were the reasons for decrease of phase purity from “x” =0.0 to 70% for “x”=1.0. Decrease in phase purity   and heterogeneity of material caused the properties to decrease. In Sol gel method, Nitrates (salts) and Ethylene glycol (liquid) were the basic material used. The mixed solutions dried out on a hot plate whose temperature was maintained constant at 200±2oC. Pellets formed by applying suitable hydraulic pressure and then sintered at same temperature written above i.e. 965±5oC for three hours. 100% phase purity achieved. All properties modified. Temperature and frequency dependent electrical properties investigated and reported here. DC and AC obtained properties were useful for different electronics and computer devices like capacitors, smart storage devices and multilayer chip inductors. Overall, both these properties improved through sol-gel method as compared to co-precipitation method. It was because of improvement in phase purity and change in morphology of synthesized material. 

Comparative Study on the Microstructure and Photoluminescence Properties of SnO2 Nano Particles Prepared by Different Methods

2015 ◽  
Vol 719-720 ◽  
pp. 132-136 ◽  
Author(s):  
Ghazaleh Allaedini ◽  
Siti Masrinda Tasirin ◽  
Meor Zainal Meor Talib ◽  
Payam Aminayi ◽  
Ifa Puspasari
Keyword(s):  
Sol Gel ◽  
Spherical Shape ◽  
Nano Particles ◽  
Precipitation Method ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Significant Difference ◽  
Co Precipitation

This study presents comparisons between the morphologies and photoluminescence properties of tin oxide (SnO2) nanoparticles prepared by two methods, namely the sol gel and the co-precipitation methods. The characteristics of the particles were analyzed using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The particles prepared using the sol-gel method have a finer particle size and more spherical shape. However, no significant difference was observed in terms of morphology and homogeneity in the samples produced by either the co-precipitation or sol-gel methods. In contrast, the photoluminescence study shows that the emission peak for powder prepared using the sol-gel method was higher than that of the co-precipitation method.

Panoscopic Assembling of Ceramic Materials for High Performance UV-Ray Shielding Application

2010 ◽  
Vol 63 ◽  
pp. 107-113
Author(s):  
Tsugio Sato ◽  
Xiang Wen Liu ◽  
Shu Yin
Keyword(s):  
High Performance ◽  
Sol Gel ◽  
Lithium Titanate ◽  
Nano Particles ◽  
Precipitation Method ◽  
Gel Method ◽  
Sol Gel Method ◽  
Uv Shielding ◽  
Micro Particles ◽  
Co Precipitation

The hybrid materials consisting of plate-like potassium lithium titanate (K0.81Li0.27Ti1.73O4) micro particles coated with calcia-doped ceria (Ce0.8Ca0.2O1.8) nano particles were prepared by the co-precipitation method and sol-gel method. Broad-spectrum UV-shielding composite materials with good comfort and low oxidation catalytic activity were successfully synthesized. The comfort when applied on skin and UV-shielding ability of the composites prepared by the sol-gel method were superior to those by the co-precipitation method.

Preparation and Microstructure of Co-Ferrite Fine Powder

2011 ◽  
Vol 328-330 ◽  
pp. 1365-1368
Author(s):  
Chang Sen Zhang ◽  
Lei Yang ◽  
Feng Zhou
Keyword(s):  
Grain Size ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Fine Powder ◽  
Precipitation Method ◽  
Mechanical Grinding ◽  
Gel Method ◽  
Sol Gel Method ◽  
Average Grain Size ◽  
Co Precipitation

Cobalt ferrites were prepared by citrate sol-gel method, chemical co-precipitation, mechanical grinding, respectively. The grain size, morphology, and the size of crystal particles were studied by x-ray diffraction (XRD) and scanning electron microscope (SEM). Cobalt ferrite showed different morphologys when prepared by different methods, It was tapered corners which prepared by sol-gel method; It was tetrahedral which prepared by mechanical grinding method; It was sphere which prepared by chemical co-precipitation method. The average grain size of cobalt ferrite was less than 100nm, while particles prepared by chemical precipitation method were the smallest. The size of Cobalt ferrite prepared by sol-gel method was decreased with the cobalt content increased.

Tunability and dielectric properties of Ba0.55Sr0.45TiO3/MgO composites prepared by heterogeneous precipitation method and sol-gel method

2017 ◽  
Vol 520 (1) ◽  
pp. 75-82
Author(s):  
Hai Jiang ◽  
Xiao-Hong Wang ◽  
Jing Tao ◽  
Hua-Bo Wang ◽  
Fang-yuan Chen ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Sol Gel ◽  
Precipitation Method ◽  
Gel Method ◽  
Sol Gel Method ◽  
Heterogeneous Precipitation

Fabrication, structure and luminescence properties of polycrystalline Tb3+-doped Lu2SiO5 films by Pechini sol–gel method

2011 ◽  
Vol 258 (5) ◽  
pp. 1768-1771 ◽  
Author(s):  
Si-qing Shen ◽  
Qing Ma ◽  
Zhi-bin Xu ◽  
Jian-jun Xie ◽  
Ying Shi ◽  
...  
Keyword(s):  
Sol Gel ◽  
Luminescence Properties ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Magnetic PbFe12O19-TiO2 nanocomposites and their photocatalytic performance in the removal of toxic pollutants

2018 ◽  
Vol 41 (3-4) ◽  
pp. 53-62 ◽  
Author(s):  
Behnaz Lahijani ◽  
Kambiz Hedayati ◽  
Mojtaba Goodarzi
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Photocatalytic Effect ◽  
Transmission Electron ◽  
Ultraviolet Light Irradiation

Abstract In this work, the PbFe12O19 nanoparticles were prepared by the simple and optimized precipitation method with different organic surfactants and capping agents. In the next step, the TiO2 nanoparticles were synthesized using the sol-gel method. At the final step, the PbFe12O19-TiO2 nanocomposites were prepared via the sol-gel method. The effect of the precipitating agent on the morphology and particle size of the products was investigated. The prepared products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. The results obtained by the vibrating sample magnetometer show the magnetic properties of the ferrite nanostructures. The photocatalytic effect of the PbFe12O19-TiO2 nanocomposite on the elimination of the azo dyes (acid black, acid violet and acid blue) under ultraviolet light irradiation was evaluated. The results indicate that the prepared nanocomposites have acceptable magnetic and photocatalytic performance.

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