Combustion Synthesis and Luminescence Properties of NaY1-XTbX(WO4)2 Novel Green Phosphors

2011 ◽  
Vol 295-297 ◽  
pp. 861-864
Author(s):  
Xian Hua Qian ◽  
Da Feng Zhang ◽  
Xi Peng Pu
Keyword(s):  
Decay Curve ◽  
Green Light ◽  
Combustion Method ◽  
Luminescence Properties ◽  
Photoluminescence Spectra ◽  
Green Phosphor ◽  
X Ray ◽  
Fluorescent Lamps ◽  
Structure Morphology ◽  
Light Excitation

NaY1-xTbx(WO4)2 green phosphors have been synthesized by a facile combustion method. The structure, morphology and luminescence properties of as-synthesized phosphors were characterized via X-ray powder diffraction (XRD), photoluminescence spectra, and decay curve. The XRD results indicate that as-synthesized phosphors exhibit sheelite-type structure without any impurity phase. The as-obtained phosphors emit strong green light centered at 546 nm under ultraviolet light excitation. The lifetimes are about 0.57 ms. The excellent luminescence properties make it a new promising green phosphor for fluorescent lamps application.

Photoluminescence Properties of NaLa(WO4)2:Tb3+ Novel Green Phosphors Prepared by the Combustion Method

2011 ◽  
Vol 694 ◽  
pp. 513-517 ◽  
Author(s):  
Xian Hua Qian ◽  
Xi Peng Pu ◽  
Da Feng Zhang ◽  
Shi Cai Cui ◽  
Yan Yan Gao
Keyword(s):  
Green Light ◽  
Combustion Method ◽  
Impurity Phase ◽  
Optimum Concentration ◽  
Optimum Temperature ◽  
Excitation Band ◽  
Photoluminescence Properties ◽  
Wide Region ◽  
X Ray ◽  
Light Excitation

A series of NaLa(WO4)2:Tb3+ green phosphors have been prepared by a facile combustion method. X-ray powder diffraction (XRD) and photoluminescence were used to characterize the structure and luminescence properties of as-synthesized phosphors, respectively. The XRD results confirm that the as-synthesized phosphors exhibit sheelite-type structure without any impurity phase. The excitation band of the phosphors covers a wide region of 200-300 nm. The as-obtained phosphors emit strong green light centered at 546 nm under ultraviolet light excitation (261 nm). The results show that the optimum temperature is 800°C and the optimum concentration of Tb3+-dopant is 50 at%.

scholarly journals Annealing effects on luminescent properties of Eu3+ doped Gd2Zr2O7 nanopowders

2015 ◽  
Vol 47 (3) ◽  
pp. 269-272 ◽  
Author(s):  
M.S. Rabasovic ◽  
D. Sevic ◽  
J. Krizan ◽  
M.D. Rabasovic ◽  
N. Romcevic
Keyword(s):  
Low Cost ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Combustion Method ◽  
Luminescence Properties ◽  
Camera System ◽  
Strong Emission ◽  
Structure Morphology ◽  
Annealing Effects ◽  
Size And Morphology

In this report presented are structure, morphology and luminescence properties of nanopowders based on gadolinium zirconium oxide (Gd2Zr2O7) doped by europium ions (Eu3+). The nanopowders were prepared using a flame combustion method, the most frequently used process due to the simplicity and low cost of the synthesis procedures and also due to the possibility of tailoring the size and morphology of particles. The produced material is suitable for various optical devices. The luminescence properties of synthesized nanopowders were characterized by emission spectra and luminescence lifetimes obtained by using the streak camera system. Moreover, emission spectra were obtained and compared for powders as-obtained and after additional annealing at 1200o C. Luminescence emission spectra clearly show peaks characteristic for the strong emission lines at 611 nm and 630 nm corresponding to the 5D0 ? 7F2 long lived transition.

SYNTHESIS AND PHOTOLUMINESCENCE PROPERTIES OF Er3+, Eu3+ IONS ACTIVATED SrAl12O19

2006 ◽  
Vol 20 (29) ◽  
pp. 4891-4898 ◽  
Author(s):  
VIJAY SINGH ◽  
JUN-JIE ZHU
Keyword(s):  
Optical Properties ◽  
Combustion Method ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Aluminate Phosphor

Synthesis of Er 3+, Eu 3+ ions activated strontium hexa-aluminate phosphor using the combustion method is described. An efficient phosphor can be prepared by this method at reaction temperatures as low as 500°C in a few minutes. Powder X-ray diffraction and the optical properties were studied by photoluminescence spectra.

Crystal Structure and Luminescence of Layered Perovskites Sr3LnInSnO8

2015 ◽  
Vol 230 ◽  
pp. 67-72 ◽  
Author(s):  
Yuriy Titov ◽  
Sergiy G. Nedilko ◽  
Vitalii Chornii ◽  
V. Scherbatskii ◽  
Nadiya Belyavina ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Powder Diffraction ◽  
Luminescence Properties ◽  
Excitation Wavelength ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
X Ray ◽  
Layered Perovskites

The Sr3LnInSnO8(Ln = La, Pr, Nd) layered perovskites were synthesized and their structures have been determined by X-ray powder diffraction. Luminescence properties of the synthesized polycrystalline compounds Sr3PrInSnO8and Sr3NdInSnO8were investigated. Photoluminescence spectra of Sr3PrInSnO8substantially depend on excitation wavelength unlike Sr3NdInSnO8compound. The correlations between peculiarities of the crystal structures and photoluminescence properties have been discussed.

Combustion Synthesis of Nanocrystalline Y2O2S: Eu 3+ , Mg 2+ , Ti 4+ Red Long-Lasting Phosphors Using Mixture Fuel of Thiourea and Citric Acid

2013 ◽  
Vol 652-654 ◽  
pp. 669-672 ◽  
Author(s):  
Xiao Bao Han ◽  
Xiang Guo Li ◽  
Gui Hua Peng ◽  
Zhen Hua Liang ◽  
Xia Wang
Keyword(s):  
Citric Acid ◽  
Luminescent Properties ◽  
Combustion Method ◽  
Molar Ratio ◽  
Hexagonal Crystal Structure ◽  
X Ray Diffraction ◽  
Hexagonal Crystal ◽  
Red Emission ◽  
X Ray ◽  
Structure Morphology

Nanocrystalline Y2O2S: Eu3+, Mg2+, Ti4+red long-lasting phosphor was synthesized successfully by combustion method using thiourea and citric acid as fuel. The structure, morphology and luminescent properties of these phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy (PL). The experimental results revealed that the phosphor was composed of sheet-shaped Y2O2S with hexagonal crystal structure. They exhibited strong red emission at 617 nm and 626nm. In addition, the dosage of citric acid has great effect on the phosphor. When molar ratio of citric acid to Y3+is 1.3, the resulted phosphor gives the highest emission intensity.

Tb3+ Doped CaMgSi2O6-Based Green Phosphor

2011 ◽  
Vol 187 ◽  
pp. 394-398
Author(s):  
Ren Qing Wang
Keyword(s):  
Green Light ◽  
Luminescent Properties ◽  
Raw Material ◽  
Solid State Method ◽  
Green Phosphor ◽  
Reducing Atmosphere ◽  
Structure Morphology ◽  
New Type ◽  
Ultraviolet Ray ◽  
Green Fluorescent

SiO2，CaO and MgO was chosen as main raw material and Solid State method was used to prepare the sample. The precursor was directly sintered at 1000°C with reducing atmosphere for 3 h to obtain new green CaMgSi2O6:Tb3+,Li+Phosphors.The effects of the content of the doping ions Tb3+ on the luminescent properties have been studied. The structure, morphology and luminescent properties of the phosphors were characterized by XRD,SEM,UV and PL-PLE spectra respectively.The results showed that the CaMgSi2O6:Tb3+,Li+ was base-centered monoclinic crystals, the phosphor particle distributed uniformly.The phosphor has a strong absorptive capacity excited by 230 nm ultraviolet ray, and could emit the strong green light with the wavelength of 543 nm(5D4→7F5). The CaMgSi2O6:Tb3+,Li+ is a new type of green fluorescent material.

A Facile Co-Precipitation Synthesis and Luminescence Properties of Red-Emitting La2O2SO4: x%Eu3+ Nanophosphors

2018 ◽  
Vol 281 ◽  
pp. 679-685 ◽  
Author(s):  
Fan Liu ◽  
Jing Bao Lian ◽  
Guang Xi Xu ◽  
Nian Chu Wu
Keyword(s):  
Raw Materials ◽  
Average Diameter ◽  
Luminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Double Exponential ◽  
Subsequent Calcination ◽  
Light Excitation ◽  
Co Precipitation ◽  
Decay Behavior

A series of Eu3+ ions activated La2O2SO4 nanophosphors had been prepared successfully by a facial co-precipitation route followed by a subsequent calcination treatment. The commercial Eu2O3, La2O3, HNO3, (NH4)2SO4 and NH3·H2O were used as the raw materials. The structural analyses and luminescence properties of as-prepared products were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and photoluminescence (PL) spectra. Pure La2O2SO4 quasi-sphere nanoparticles with an average diameter of 40 nm were successfully prepared by calcining the precursor at 800 °C for 2 h in air. PL results reveal that the strongest red emission peak is centred at 617 nm upon 393 nm light excitation, corresponding to the 5D0→7F2 transition of Eu3+ ions. Its quenching concentration is 9 mol%, which can be attributed to the exchange interaction among Eu3+ ions and the corresponding decay process shows a double exponential decay behavior, with 0.310 μs for t1 and 1.419 μs for t2.

Luminescence Properties of Eu3+ and Dy3+ Doped Magnesium Tellurite Borophosphate Glass

2016 ◽  
Vol 846 ◽  
pp. 75-79
Author(s):  
Siti Maisarah Aziz ◽  
Rosli Hussin
Keyword(s):  
Glass Sample ◽  
Decay Curve ◽  
Amorphous State ◽  
Luminescence Properties ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Amorphous Phases ◽  
Borophosphate Glass ◽  
Co Doped

The luminescence properties of rare earth in glass are interesting to study and being one of attractive properties in development of laser. A series of Eu3+/Dy3+ co-doped magnesium tellurite borophosphate glass has been prepared with nominal composition 50B2O3-15P2O5-25MgO-10TeO2. The amorphous phases of the sample were characterized using X-ray diffraction pattern and the presence of a broad hunch shows that the sample in an amorphous state. For Eu3+/Dy3+ co-doped borophosphate glass sample of consist five peaks where Eu3+ emission were located at 611 nm, 662 nm and 699 nm due to the transition of 5D0-7FJ ( J = 2, 3, 4) while the Dy3+ emission is due to transition 4F9/2-5HJ/2 (J = 15 and 13). Furthermore, glass sample showed exponential decay curve and lifetime for glass sample is determined.

scholarly journals Structural and Enhanced Optical Properties of Stabilized γ‒Bi2O3 Nanoparticles: Effect of Oxygen Ion Vacancies

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1023 ◽  
Author(s):  
Ashish Chhaganlal Gandhi ◽  
Chia-Liang Cheng ◽  
Sheng Yun Wu
Keyword(s):  
Room Temperature ◽  
Excess Oxygen ◽  
Ambient Atmosphere ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Band Emission ◽  
Oxygen Ion ◽  
Integrated Intensity ◽  
Effect Of Oxygen

We report the synthesis of room temperature (RT) stabilized γ–Bi2O3 nanoparticles (NPs) at the expense of metallic Bi NPs through annealing in an ambient atmosphere. RT stability of the metastable γ–Bi2O3 NPs is confirmed using synchrotron radiation powder X-ray diffraction and Raman spectroscopy. γ–Bi2O3 NPs exhibited a strong red-band emission peaking at ~701 nm, covering 81% integrated intensity of photoluminescence spectra. Our findings suggest that the RT stabilization and enhanced red-band emission of γ‒Bi2O3 is mediated by excess oxygen ion vacancies generated at the octahedral O(2) sites during the annealing process.

scholarly journals Hydrothermal Synthesis, Characterization and Exploration of Photocatalytic Activities of Polyoxometalate: Ni-CoWO4 Nanoparticles

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 456
Author(s):  
Fahad A. Alharthi ◽  
Hamdah S. Alanazi ◽  
Amjad Abdullah Alsyahi ◽  
Naushad Ahmad
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Structure Morphology ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Photocatalytic Reactions ◽  
Cobalt Tungstate

This study demonstrated the hydrothermal synthesis of bimetallic nickel-cobalt tungstate nanostructures, Ni-CoWO4 (NCW-NPs), and their phase structure, morphology, porosity, and optical properties were examined using X-ray Diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Scanning electron microscopy- energy dispersive X-ray spectroscopy (SEM-EDS), high resolution Transmission electron microscopy (HR-TEM), Brunauer-Emmett-Teller (BET) and Raman instruments. It was found that as-calcined NCW-NPs have a monoclinic phase with crystal size ~50–60 nm and is mesoporous. It possessed smooth, spherical, and cubic shape microstructures with defined fringe distance (~0.342 nm). The photocatalytic degradation of methylene blue (MB) and rose bengal (RB) dye in the presence of NCW-NPs was evaluated, and about 49.85% of MB in 150 min and 92.28% of RB in 90 min degraded under visible light. In addition, based on the scavenger’s study, the mechanism for photocatalytic reactions is proposed.

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