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.

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.

EFFECT OF STRONTIUM DOPING ON NANOSTRUCTURE AND CHROMATICITY OF Y2O3:Eu COMPOUNDS

2011 ◽  
Vol 25 (22) ◽  
pp. 2949-2956 ◽  
Author(s):  
ALI MOHAMMADI ◽  
YADOLAH GANJKHANLOU ◽  
MAHMOOD KAZEMZAD ◽  
ABDOLMAJID BAYANDORI MOGHADDAM ◽  
FEREIDOUN ALIKHANI HESSARI ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Photo Luminescence ◽  
Combustion Method ◽  
Urea Solution ◽  
Photoluminescence Intensity ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
X Ray ◽  
Transmission Electron

In this work, various nano-sized samples of Y 2 O 3, Y 2 O 3 :Eu and Y 2 O 3 :Eu , Sr were prepared by urea solution combustion method. Then the resultant nanopowders were investigated by means of X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR) and photo-luminescence emission spectra. Furthermore, the CIE color coordinate of samples were calculated from photoluminescence emission spectra. Results showed that by doping of strontium, the photoluminescence intensity and chromaticity of Y 2 O 3: Eu phosphor was enhanced while crystallite size was decreased.

Luminescent Properties of La3PO7:Eu3+ Nanoparticles

2008 ◽  
Vol 8 (3) ◽  
pp. 1410-1413 ◽  
Author(s):  
Shaozhe Lü ◽  
Jishen Zhang
Keyword(s):  
Charge Transfer Band ◽  
Emission Spectra ◽  
Local Environment ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
Excitation Spectra ◽  
Time Resolved ◽  
Transmission Electron ◽  
Light Excitation ◽  
Average Size

La3PO7:Eu3+ samples were prepared by combustion and annealing and characterized by X-ray diffraction and transmission electron microscopy. It was found that the average size of the particles is about 80 nm. The red emission from the 5D0 → 7F2 transition of the Eu3+ ions under ultraviolet light excitation is much stronger than the orange emission from the 5D0 → 7F1 transition. The emission spectra, charge transfer band, laser selective excitation spectra, and time-resolved spectra indicate that symmetry of the local environment of Eu3+ lacks an inversion center and Eu3+ ions occupy at least two types of sites in the La3PO7 crystal. The superior color chromaticity compared to other phosphates and borates doped with Eu3+ means La3PO7:Eu3+ may have potential as a luminescent material.

Preparation and Photoluminescence of Nano-Sized Green Phosphors by Solution Combustion Synthesis

2012 ◽  
Vol 174-177 ◽  
pp. 1015-1018
Author(s):  
Z. Chen ◽  
Li Qiang Zhang ◽  
Miao Miao Wang ◽  
Zhi Ying Zhao ◽  
De Hui Liu ◽  
...  
Keyword(s):  
Combustion Synthesis ◽  
Emission Spectra ◽  
Solution Combustion Synthesis ◽  
Green Emission ◽  
Wide Band ◽  
Luminescent Properties ◽  
Solution Combustion ◽  
Fluorescent Lamps ◽  
Good Crystallinity ◽  
Plasma Display

By adopting a facile solution combustion synthesis (SCS) method, pure well-crystallized (Ba,Sr)MgAl10O17:Mn green phosphors were successfully prepared. The crystallinity, particle size, morphology, and luminescent properties were characterized by XRD, FE-SEM and spectrofluorometer respectively. The results indicated that the obtained phosphors have spherical morphology, good crystallinity, and strong green emission. The emission spectra of obtained nanophosphor on 147nm excitation consist of a wide band with the peak at 518nm, which corresponds to the transition from the 3d5(4T1g) excited state to the 3d5(6A1g) ground state of Mn2+. The synthesized phosphors can be efficiently excited at VUV light and have potential application in Plasma Display Panels (PDPs), 3D displays and mercury-free fluorescent lamps

scholarly journals Role of NH4Cl as Flux on Photoluminescence Properties of Ca1-xZrO3:Eux (x = 0.05) Synthesized by Solution Combustion Route

2021 ◽  
Vol 33 (3) ◽  
pp. 686-690
Author(s):  
S.G. Prasanna Kumar ◽  
Nagaraju Kottam ◽  
R. Preetham ◽  
D. L. Monika
Keyword(s):  
Combustion Synthesis ◽  
Emission Spectra ◽  
Solution Combustion Synthesis ◽  
Photoluminescence Intensity ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
One Pot ◽  
Red Phosphor ◽  
Synthesis Approach

CaZrO3 ceramics exhibits high chemical, thermal and structural stability. However, its application as a host for various luminophores/activators has not been clearly explored. In present study, CaZrO3 doped with Eu3+, as a potential orange-red phosphor and the effect of NH4Cl as flux during combustion synthesis is investigated. Ca1-xZrO3:Eux (x = 0.05) nanophosphor was prepared through a low temperature, one pot solution combustion synthesis approach using glycine as fuel. Various wt.% of NH4Cl (wt.% = 0, 1, 3, 5, 7) as flux added to the reaction mixture and combustion reaction was performed. X-ray diffraction results showed that the addition of flux has significant effect on the crystallite size and the crystallinity of Ca1-xZrO3:Eux (x = 0.05) phosphor. From SEM morphology, the particles were found to be significantly agglomerated. The extent of agglomeration varies with varying the wt.% of flux. The photoluminescence excitation and emission spectra were recorded under similar condition to evaluate the effect of flux on the optical properties. Interestingly, the amount of flux was found to have significant effect on the photoluminescence emission characteristics. The photoluminescence intensity was found to be the maximum when the flux used was 5 wt.% and further increase in flux amount the photoluminescence intensity decreases. The mechanistic aspects of effect of flux on the photoluminescence were also discussed.

Photoluminescence, Synthesis,Characterization of MgO Nanophosphors Influenced by Dy3+ Ions Concentrations

2021 ◽  
Vol 30 (1) ◽  
pp. 130-138
Author(s):  
Gitanjali Sahu ◽  
Anubha S. Gour
Keyword(s):  
Synthesis Method ◽  
Emission Spectra ◽  
Solution Combustion Synthesis ◽  
Combustion Method ◽  
Xrd Analysis ◽  
Magnesium Nitrate ◽  
Solution Combustion ◽  
X Ray ◽  
Transmission Electron ◽  
Photoluminescence Studies

The present paper reports the synthesis, characterization and photoluminescence (PL) studies of MgO:Dy3+ nanoparticles. In this work, MgO:Dy3+ nanophosphors were prepared through solution combustion synthesis method using magnesium nitrate as oxidizer and urea as a fuel. The as-obtained MgO:Dy3+ nanomaterials were characterized by powder X-ray diffraction (XRD), energy-dispersive X-ray (EDX) analysis, Fourier transformation infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), high resolution transmission electron microscope (HRTEM), photoluminescence (PL) spectra and afterglow curve analysis. The cubic structure of the MgO phosphors is confrmed by XRD analysis and crystalline size calculated by Scherer’s formula using XRD data shows the nanocrystalline nature of the phosphor. No phase change is observed with increasing concentrations of Dy3+ ions. The surface morphology of the prepared phosphors is determined by SEM, which shows a sphere-like structure and good connectivity of the grains. The confrmation of the nanocrystalline phosphors is examined by HRTEM analysis.The photoluminescence studies revealed that the emission spectra of the prepared phosphors shows the broad emission centered at 435 nm and 480 nm due to the transition arises from the 4f→5d defect band transition of Dy3+ ions. The afterglow decay characteristics of different as synthesized MgO:Dy3+ nanophosphors are conceptually described. This is the first reported that on the synthesis of nanocrystalline MgO:Dy3+ materials by combustion method using urea as a fuel.

scholarly journals Fabrication of La2O3 Uniformly Doped Mo Nanopowders by Solution Combustion Synthesis Followed by Reduction under Hydrogen

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2385 ◽  
Author(s):  
Siyong Gu ◽  
Mingli Qin ◽  
Houan Zhang ◽  
Jidong Ma
Keyword(s):  
Combustion Synthesis ◽  
Hydrogen Reduction ◽  
Synthesis Method ◽  
Reduction Process ◽  
Solution Combustion Synthesis ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
X Ray ◽  
Transmission Electron

This work reports the preparation of La2O3 uniformly doped Mo nanopowders with the particle sizes of 40–70 nm by solution combustion synthesis and subsequent hydrogen reduction (SCSHR). To reach this aim, the foam-like MoO2 precursors (20–40 nm in size) with different amounts of La2O3 were first synthesized by a solution combustion synthesis method. Next, these precursors were used to prepare La2O3 doped Mo nanopowders through hydrogen reduction. Thus, the content of La2O3 used for doping can be accurately controlled via the SCSHR route to obtain the desired loading degree. The successful doping of La2O3 into Mo nanopowders with uniform distribution were proved by X-ray photon spectroscopy and transmission electron microscopy. The preservation of the original morphology and size of the MoO2 precursor by the La2O3 doped Mo nanopowders was attributed to the pseudomorphic transport mechanism occurring at 600 °C. As shown by X-ray diffraction, the formation of Mo2C impurity, which usually occurs in the direct H2 reduction process, can be avoided by using the Ar calcination-H2 reduction process, when residual carbon is removed by the carbothermal reaction during Ar calcination at 500 °C.

Luminescent Properties of Gd2MoO6:Eu3+ Nanophosphor for WLEDs

2021 ◽  
Author(s):  
Yan Chen ◽  
Yuemei Lan ◽  
Dong Wang ◽  
Guoxing Zhang ◽  
Wenlong Peng ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Fluorescence Spectra ◽  
Solvothermal Method ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

A series of Gd2-xMoO6:xEu3+(x=0.18-0.38) nanophosphors were synthesized by the solvothermal method. The properties of this nanophosphor were characterized by x-ray diffraction (XRD), transmission electron microscope (TEM), fluorescence spectra and diffuse...

Flameless Solution Combustion Synthesis of Al3+ Doped LiMn2O4

2011 ◽  
Vol 186 ◽  
pp. 7-10 ◽  
Author(s):  
Gui Yang Liu ◽  
Jun Ming Guo ◽  
Bao Sen Wang ◽  
Ying He
Keyword(s):  
Combustion Synthesis ◽  
Synthesis Method ◽  
Solution Combustion Synthesis ◽  
Xrd Analysis ◽  
Cycling Performance ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
Electrochemical Test ◽  
Micro Morphology ◽  
Better Than

Single phase Al3+ doped LiMn2O4 has been prepared by flameless solution combustion synthesis method at 600oC for 1h. X-ray diffraction (XRD) and scanning electric microscope (SEM) were used to determine the phase composition and micro morphology of the products. XRD analysis indicates that the purities increase and the lattice parameters of the products decrease with increasing Al3+ content. Electrochemical test indicates that the cycling performance of the products with Al3+ doping are better than that of the product without Al3+ doping. The product LiAl0.10Mn1.90O4 gets the best electrochemical performance. At the current density of 30mA/g, the initial discharge capacity of LiAl0.10Mn1.90O4 is 124.8mAh/g, and after 20 cycles, the capacity retention is more than 89%. SEM investigation indicates that the particles of LiAl0.10Mn1.90O4 are sub-micron in size and well dispersed.

Fabrication, characterization and magnetic properties of Na-doped ZnO nanorods

2016 ◽  
Vol 09 (03) ◽  
pp. 1650039 ◽  
Author(s):  
Jingyuan Piao ◽  
Li-Ting Tseng ◽  
Kiyonori Suzuki ◽  
Jiabao Yi
Keyword(s):  
Magnetic Measurements ◽  
Zno Nanorods ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Shallow Donors ◽  
Na Doping ◽  
Transmission Electron ◽  
Doped Zno ◽  
Electron Paramagnetic

Na-doped ZnO nanorods have been fabricated through a hydrothermal method. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses indicate that the d spacing of ZnO increases with increasing doping concentration, suggesting the effective incorporation of dopant Na in the samples. Electron paramagnetic resonance (EPR) measurements indicate that there are shallow donors in pure ZnO samples and the shallow donors are strongly prohibited by Na doping. In addition, the resonance at g = 2.005 suggests the formation of Zn vacancies. Magnetic measurements indicate that pure ZnO is paramagnetic and Na doping leads to ferromagnetism at room temperature. Moreover, 0.5% Na-doped ZnO nanorods exhibits the largest saturation magnetization.

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