scholarly journals Synthesis and Photoluminescence Study of Bi3+and Pb2+Activated Ca3(BO3)2

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
A. B. Gawande ◽  
R. P. Sonekar ◽  
S. K. Omanwar
Keyword(s):  
Stokes Shift ◽  
Solution Combustion Synthesis ◽  
Optimum Concentration ◽  
Prepared Phosphor ◽  
Luminescent Materials ◽  
Photoluminescence Properties ◽  
Solution Combustion ◽  
Sem Images ◽  
Synthesized Materials ◽  
Combustion Synthesis Technique

The photoluminescence properties of Pb2+and Bi3+doped Ca3(BO3)2prepared by solution combustion synthesis technique are discussed. The structure of the prepared phosphor is characterized and conformed by XRD and FTIR. SEM images of the prepared materials show irregular grains with agglomerate phenomena. Prepared phosphors achieved the band emissions, respectively, at 365 nm and 335 nm corresponding to the transitionP1→S013. Optimum concentration, critical transfer distance, and Stokes shift of the synthesized materials were measured. These phosphors may provide an efficient kind of luminescent materials for various applications in medical and industry.

Fabrication, Structural, and Spectroscopic Investigation of Tb-Doped Lu3Al5O12 Phosphor

2005 ◽  
Vol 20 (11) ◽  
pp. 2934-2939 ◽  
Author(s):  
Yikun Liao ◽  
Danyu Jiang ◽  
Tao Feng ◽  
Jianlin Shi
Keyword(s):  
Particle Size ◽  
Crystallization Temperature ◽  
High Performance ◽  
Growth Process ◽  
Solution Combustion Synthesis ◽  
Processing Parameters ◽  
Solution Combustion ◽  
Urea Content ◽  
Emission Intensity Ratio ◽  
Combustion Synthesis Technique

A simple solution combustion synthesis technique was explored to produce Tb3+-doped Lu3Al5O12 (LuAG:Tb) phosphor with particle size in the range from about 25 to 900 nm by using glycine, urea, and the mixture of them as fuels. The effects of processing parameters such as type of fuel, fuel-to-oxidizer ratio and the composition of the complex fuel were studied. An increase in phosphor brightness and a decrease in crystallization temperature with increasing urea content in the fuel were observed. The integrated emission intensity ratio of the 5D3–7Fj transition to the 5D4–7Fj transition as a function of Tb concentration in LuAG was also investigated. It is very interesting that the growth process of the particles exhibited two steps when the content of urea in the complex fuel increased from 0 to 1.0. By tailoring the glycine-to-urea ratio in the fuel, an excellent fuel was found and high performance phosphors were obtained.

scholarly journals Influence of Nitridation on Structural and Photoluminescence Behaviour of CaZrO3:Eu3+ Nanophosphors

2020 ◽  
Vol 32 (6) ◽  
pp. 1515-1519
Author(s):  
S.G. Prasanna Kumar ◽  
Nagaraju Kottam ◽  
R. Hari Krishna ◽  
M.N. Chandra Prabha ◽  
R. Preetham ◽  
...  
Keyword(s):  
Solution Combustion Synthesis ◽  
Orthorhombic Phase ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
Sem Images ◽  
Small Shift ◽  
Nitridation Time ◽  
Transmission Electron ◽  
Wide Range ◽  
Temperature Solution

Ca1-xZrO3:xEu3+ (x = 0.05) phosphors have been prepared by using the low temperature solution combustion synthesis. The prepared nano phospors are well characterized by powder X-ray diffraction, scanning electron microscopy, Fourier infrared spectroscopy and transmission electron spectroscopy. PXRD results showed orthorhombic phase and SEM images showed porous agglomerated morphology. Influence of nitridation on structural and photoluminescence properties of the phosphor were investigated for wide range of nitridation time. The photoluminescence (PL) intensity was found to vary with nitridation with small shift in the photoluminescence emission peaks. The probable reasons for the variation of photoluminescence with nitridation are discussed.

Synthesis and photoluminescence properties of a novel Sr2CeO4:Dy3+ nanophosphor with enhanced brightness by Li+ co-doping

RSC Advances ◽  
2014 ◽  
Vol 4 (73) ◽  
pp. 38655-38662 ◽  
Author(s):  
D. L. Monika ◽  
H. Nagabhushana ◽  
R. Hari Krishna ◽  
B. M. Nagabhushana ◽  
S. C. Sharma ◽  
...  
Keyword(s):  
Low Temperature ◽  
Combustion Synthesis ◽  
Solution Combustion Synthesis ◽  
Photoluminescence Properties ◽  
Solution Combustion ◽  
Co Doping ◽  
Temperature Solution ◽  
Strontium Cerate ◽  
Co Doped

A series of Dy3+ (0.005–0.09 mol%) and Li+ (0.005–0.03 mol%) co-doped strontium cerate (Sr2CeO4) nanopowders are synthesized by low temperature solution combustion synthesis.

Effect of Fe substitution on Dielectric, Electrical and Photocatalytic Behav-ior of ZnO Nanoparticles

2020 ◽  
Vol 05 ◽  
Author(s):  
U.B. Gawas ◽  
Rajesh M. Pednekar ◽  
Manoj M. Kothawale ◽  
N. K. Prasad ◽  
S. K. Alla
Keyword(s):  
Dielectric Loss ◽  
Zno Nanoparticles ◽  
Small Polaron ◽  
Solution Combustion Synthesis ◽  
Average Crystallite Size ◽  
Diffraction Measurement ◽  
Solution Combustion ◽  
Sem Images ◽  
Polaron Hopping ◽  
Fe Substitution

Aims: To develop the simple and cost effective synthetic strategy for preparation of Fe substituted ZnO nanopar-ticles. <p> Background: The optoelectronic, electrical, dielectric, optical and magnetic properties of nanocrystalline transition metal substituted ZnO are being explored worldwide for variety of applications in optoelectronic devices, solar cells, transparent thin film transistors, ultraviolet photodetector, piezoelectric devices, light emitting diodes as well as biomedical field. Fe substituted ZnO nanoparticles are being looked upon as promising material in dilute magnetic semiconductor system. <p> Objective: To establish to chemical identity and purity in order to ensure the complete substitution of Fe3+ in ZnO lattice and study the effect of Fe substitution on dielectric, electrical and photocatalytic behavior of ZnO nanoparticles. <p> Method The nearly spherical ZnO and Fe substituted ZnO nanoparticles were synthesized at low temperature via solution combustion synthesis employing metal nitrate and sucrose. <p> Result: The powder X-ray diffraction measurement has revealed the monophasic character and complete substitution of Fe in the wurtzitic ZnO lattice. The lattice constants and aspect ratio of Fe substituted ZnO were nearly constant and comparable to that of pristine ZnO. The average crystallite size was found to decrease with increasing Fe substitution. SEM images revealed porous spongy network like morphology. TEM measurements revealed nearly spherical particle with narrow size distribution between 10 nm - 25 nm. <p> Conclusion:The dielectric constant and dielectric loss decrease upto x = 0.04 and increases with further increase in Fe concentration. The lower value of dielectric loss in the higher frequency region indicates the less lossy nature of Fe substi-tuted samples. AC conductivity behaviour suggests small polaron hopping type of conduction mechanism. The RT DC resistivity was found to decrease with increasing Fe substitution. Pristine ZnO displayed very high degradation efficiency for photodegradation of MB dye. The photodegradation efficiency was found to decrease considerably with increasing Fe substitution.

Structure and Luminescence of Ce-doped Lu2SiO5 Nanophosphor

2007 ◽  
Vol 1056 ◽  
Author(s):  
Michael Wayne Blair ◽  
Luiz G Jacobsohn ◽  
Bryan L Bennett ◽  
Ross E Muenchausen ◽  
Stephanie C Sitarz ◽  
...  
Keyword(s):  
Stokes Shift ◽  
Emission Spectra ◽  
Solution Combustion Synthesis ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
Paramagnetic Resonance ◽  
Transmission Electron ◽  
Electron Energy Loss ◽  
Ce Content

ABSTRACTNanophosphors correspond to nanostructured inorganic insulator materials that emit light under particle or electromagnetic radiation excitation. In this work we investigate the structure and luminescent properties of Ce-doped Lu2SiO5 (LSO) nanophosphors prepared by solution combustion synthesis with the Ce content 0.1 to 12 at. %. Samples were characterized by transmission electron microscopy (TEM), line scan electron energy-loss spectroscopy (EELS), x-ray diffraction (XRD), and electron paramagnetic resonance (EPR) spectroscopy. Photoluminescence excitation and emission spectra are composed of two major bands centered at 360 and 430 nm, respectively. These results reveal a red-shift and enhanced Stokes shift for the nanophosphors when compared to bulk. Ce content was also found to affect photoluminescence emission intensity and fluorescent lifetime. The nanophosphor concentration quenching curve presents a broad maximum centered at 1 at.%. Lifetime measurements show a continuous decrease from 34 to 21 ns as Ce content is increased.

Solution-Combustion Synthesis and Study of : γ-Fe2-xCrxO3(0.75 ≤ x ≤ 1.25) Maghemite-like Materials

2008 ◽  
Author(s):  
Emilio Moran ◽  
Miguel ïngel. Alario-Franco ◽  
Marco L. Garcia-Guaderrama ◽  
Oscar Blanco
Keyword(s):  
Combustion Synthesis ◽  
Solution Combustion Synthesis ◽  
Solution Combustion

Effect of Nitric Acid Modification on LiMn2O4 Prepared by Solution Combustion Synthesis

2011 ◽  
Vol 80-81 ◽  
pp. 332-336 ◽  
Author(s):  
Yan Xia ◽  
Mei Huang ◽  
Jun Ming Guo ◽  
Ying Jie Zhang
Keyword(s):  
Nitric Acid ◽  
Combustion Synthesis ◽  
Discharge Capacity ◽  
Retention Rate ◽  
Solution Combustion Synthesis ◽  
Manganese Acetate ◽  
Solution Combustion ◽  
Acid Modification ◽  
Capacity Retention ◽  
Liquid Combustion

Effect of nitric acid and the burning time on the liquid combustion synthesis of spinel LiMn2O4 has been studied, using lithium nitrite and Manganese acetate as raw a material. The results show that the main phases are all LiMn2O4, which can be obtained at 400-600 oC. Before modified, the impurity is Mn3O4 or Mn2O3. After modified, the impurity is only Mn3O4. The aggregation obviously reduced after adding nitric acid, it is indicated that the crystalline increased. With the increasing temperatures, the modified particle size was increased and the aggregation reduced. The initial discharge capacity and cycle stability improved at some extent too. Its first discharge capacity was 104.6, 112.8 and 117.7mAh/g synthesized at 400, 500, 600 oC, respectively, and the 30th capacity retention rate were 84.89%, 80.67% and 73.24%.

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