Co-doping effect of CaS and Nd2S3 nanocrystallites on luminescence properties of sol–gel SiO2 xerogel

2005 ◽  
Vol 91 (2-3) ◽  
pp. 253-256
Author(s):  
Ping Yang ◽  
Meng Kai Lü ◽  
Chun Feng Song ◽  
Dong Xu ◽  
Duo Long Yuan ◽  
...  
Keyword(s):  
Sol Gel ◽  
Doping Effect ◽  
Luminescence Properties ◽  
Co Doping

Luminescence Properties of Ytterbium Activated PLZT Ceramics

2016 ◽  
Vol 98 ◽  
pp. 64-69
Author(s):  
Malgorzata Plonska ◽  
Wojciech A. Pisarski ◽  
Joanna Pisarska
Keyword(s):  
Near Infrared ◽  
Sol Gel ◽  
Ceramic Matrix ◽  
Luminescence Decay ◽  
Luminescence Properties ◽  
Luminescence Spectra ◽  
Activator Concentration ◽  
Ceramic Powders ◽  
Co Doping ◽  
Infrared Luminescence

In the present work the influence of co-doping with ytterbium ions (for 0, 0.5, 1.5, 2.5 wt.% of Yb3+) on physical properties of 8/65/35 PLZT was studied. The ceramic powders were synthesized by the modified sol-gel method, and underwent consolidation by the pressure-less sintering techniques, in Ts=1200°C/6h. Our investigations give a detailed account of the relationships between concentrations of trivalent ytterbium ions in PLZT matrix, on their structure, microstructure, as well as luminescence properties. Near-infrared luminescence spectra at about 1020 nm were registered, which correspond to 2F5/2 - 2F7/2 transition of Yb3+. Based on decay measurements, the luminescence lifetimes for the 2F5/2 excited state of Yb3+ were determined. Luminescence decay analysis indicates that the 2F5/2 lifetime increase with increasing activator concentration (Yb3+) in PLZT ceramic matrix.

Luminescence Properties and Energy Transfer of Sm3+-Eu3+ Co-Doped Gd2(MoO4)3 Red Phosphors

2012 ◽  
Vol 591-593 ◽  
pp. 931-934 ◽  
Author(s):  
Xiu Juan Geng ◽  
Yong Jie Chen ◽  
Yan Wen Tian ◽  
Lin Jiu Xiao
Keyword(s):  
Particle Size ◽  
Energy Transfer ◽  
Sol Gel ◽  
Luminescence Properties ◽  
Good Prospect ◽  
Efficient Energy Transfer ◽  
Co Doping ◽  
Red Phosphors ◽  
Chromaticity Coordinates ◽  
Standard Values

The red phosphor Gd2(MoO4)3:Eu3+,Sm3+ was prepared by sol-gel method. The morphology and luminescence characteristics of the phosphor particles were characterized by scanning electron microscopy (SEM) and fluorophotometer. The results showed that the phosphor had the advantages of small particle size and the uniform particle size distribution. The luminescence properties of Eu3+ ions in Gd1.37Eu0.6Sm0.03(MoO4)3 could be evidently improved by co-doping of Sm3+ ions, which was due to the efficient energy transfer process from Sm3+ to Eu3+ ions. The chromaticity coordinates for Eu3+ doped Gd1.4Eu0.6(MoO4)3 and Eu3+ and Sm3+ codoped Gd1.37Eu0.6Sm0.03(MoO4)3, are(0.662, 0.329) and (0.668, 0.331), respectively. Because of the introduction of Sm3+ into the red-emitting phosphors, the chromaticity coordinates of Gd1.37Eu0.6Sm0.03(MoO4)3 phosphor is closer to the standard values of International chromaticity coordinates(0.67, 0.33). So Gd1.37Eu0.6Sm0.03(MoO4)3 shows good prospect for red phosphors of white LED.

Insights into the co-doping effect of Fe3+ and Zr4+ on the anti-K performance of CeTiOx catalyst for NH3-SCR reaction

2021 ◽  
pp. 125821
Author(s):  
Keke Kang ◽  
Xiaojiang Yao ◽  
Yike Huang ◽  
Jun Cao ◽  
Jing Rong ◽  
...  
Keyword(s):  
Doping Effect ◽  
Co Doping ◽  
Nh3 Scr

Improving the luminescence properties of YAG:Ce3+ phosphors by co-doping Sr2+ ions

Optik ◽  
2021 ◽  
Vol 231 ◽  
pp. 166363
Author(s):  
Wellisson S. Silveira ◽  
Ariosvaldo Junior Sousa Silva ◽  
Patresio Alexandro Miranda do Nascimento ◽  
Iure da Silva Carvalho ◽  
Marcos V. dos S. Rezende
Keyword(s):  
Luminescence Properties ◽  
Co Doping

scholarly journals The Study of Magnetic Properties for Non-Magnetic Ions Doped BiFeO3

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4061
Author(s):  
Yongtao Li ◽  
Liqing Liu ◽  
Dehao Wang ◽  
Hongguang Zhang ◽  
Xuemin He ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Local Structure ◽  
Metal Ion ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray ◽  
Co Doping ◽  
Magnetic Ions ◽  
X Ray Absorption ◽  
Fe Ions

BiFeO3 is considered as a single phase multiferroic. However, its magnetism is very weak. We study the magnetic properties of BiFeO3 by Cu and (Cu, Zn). Polycrystalline samples Bi(Fe0.95Cu0.05)O3 and BiFe0.95(Zn0.025Cu0.025)O3 are prepared by the sol-gel method. The magnetic properties of BiFe0.95(Zn0.025Cu0.025)O3 are greater than that of BiFeO3 and Bi(Fe0.95Cu0.05)O3. The analyses of X-ray absorption fine structure data show that the doped Cu atoms well occupy the sites of the Fe atoms. X-ray absorption near edge spectra data confirm that the valence state of Fe ions does not change. Cu and Zn metal ion co-doping has no impact on the local structure of the Fe and Bi atoms. The modification of magnetism by doping Zn can be understood by the view of the occupation site of non-magnetically active Zn2+.

Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles

2011 ◽  
Vol 197-198 ◽  
pp. 891-894 ◽  
Author(s):  
Cheng Zhi Jiang ◽  
Xu Dong Lu
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Sol Gel ◽  
Blue Shift ◽  
Nano Particles ◽  
Absorption Profile ◽  
Co Doping ◽  
The Matrix ◽  
Co Doped ◽  
The Eu

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

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