HIGH YIELD NANOPARTICLES SYNTHESIS OF EUROPIUM-DOPED YTTRIUM OXIDE RED-PHOSPHOR USING AN ORGANIC COMPOUND

NANO ◽  
2009 ◽  
Vol 04 (03) ◽  
pp. 141-145 ◽  
Author(s):  
WOO JUNG PARK ◽  
TAKAKI MASAKI ◽  
DAE HO YOON
Keyword(s):  
High Efficiency ◽  
Luminescent Properties ◽  
Synthesis Temperature ◽  
High Yield ◽  
X Ray Diffraction ◽  
Promising Alternative ◽  
Red Phosphor ◽  
Grain Sizes ◽  
Phase Precursor ◽  
Red Emitting Phosphor

This paper reports an approach for enhancing the luminescent properties of Y2O3:Eu3+ nanophosphors with cellulose, using a liquid phase precursor (LPP) process. The nanosized [Formula: see text] particles showed a powder X-ray diffraction pattern, corresponding to the reference, and were highly crystalline. The grain sizes of the samples synthesized at 600°C for 1 h were estimated to be approximately 19 nm. The particle sizes of the samples increased with increasing synthesis temperature and the morphology was cleaned and without impurities. In addition, all the samples had a smaller particle size than that of the commercial product. The PL spectrum consisted of weak bands at 581, 587, 593, and 599 nm, corresponding to the 5 D 0 → 7 F 1 transition, and sharp peaks with a maximum intensity occurring at approximately 610 nm, due to the 5 D 0 → 7 F 2 transition of Eu 3+. These results suggest that Y 2 O 3: Eu 3+ is a promising alternative red-emitting phosphor for high efficiency resolution display applications.

Luminescent properties and the morphology of SrMoO4:Eu3+ powders synthesized via combining sol-gel and solid-state route

Open Physics ◽  
2010 ◽  
Vol 8 (5) ◽  
Author(s):  
Qiong Wei ◽  
Donghua Chen
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Ethylenediaminetetraacetic Acid ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Synthesis Temperature ◽  
X Ray Diffraction ◽  
Red Phosphors ◽  
Solid State Route ◽  
Metal Nitrates

AbstractSrMoO4:Eu3+ red phosphors were prepared by combining sol-gel and solid-state route. Citric acid and ethylenediaminetetraacetic acid (EDTA), employed as the chelating agents, were added to the aqueous solutions of metal nitrates. X-ray diffraction (XRD) and photoluminescent spectra techniques (PL) were used to characterize the resultant powders. The results indicated the obtained SrMoO4:Eu3+ phosphors were fine powders with a particle size of 50 nm. The effects of synthesizing conditions were also investigated and optimized, which included the synthesis temperature and the activator concentration on the luminescent intensity. Compared with SrMoO4:Eu3+ phosphors prepared by Solid-state reaction SrMoO4:Eu3+ phosphors prepared by combining sol-gel and solid-state route showed appropriate particle size and a higher emission intensity.

Novel Preparation Method and Luminescent Properties of Eu3+ Doped CdWO4 Nanorod

2013 ◽  
Vol 652-654 ◽  
pp. 664-668 ◽  
Author(s):  
Fang Lei ◽  
Hao Hong Chen ◽  
Ying Shi ◽  
Jian Jun Xie ◽  
He Feng
Keyword(s):  
Diffuse Reflectance Spectroscopy ◽  
Red Light ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
Pxrd Pattern ◽  
Red Phosphor ◽  
Transmission Electron ◽  
Length Width ◽  
20 Nm ◽  
The Eu

Eu3+ doped CdWO4 nanorods, with nearly uniform nanoscale was synthesized via a novel simple hydrothermal method easy for commercial run at 160 °C, of which the average dimensions are about 250, 50 and 20 nm in length, width and height respectively from the result of transmission electron microscopy (TEM). Powder X-ray diffraction (PXRD) pattern shows the product is pure wolframite structure. Different from undoped products showed brilliant blue-green irradiation and block crystals with multi-emission bands in red light range, the Eu doped nanorods give preferred strong 5D0→7F2 transition and are excellent red phosphor with high color purity supported by the photoluminescent (PL) measurements and ultraviolet visible diffuse reflectance spectroscopy (UV-Vis DRS). This suggests that a combination of the Eu3+ doped and undoped products are potential to realize the white lighting LED with blue, green and red components.

A New Method for Preparation and Luminescence of YBO3 :Eu3+ Phosphor

2011 ◽  
Vol 287-290 ◽  
pp. 1460-1463 ◽  
Author(s):  
Lin Yan Jia ◽  
Zhong Bao Shao ◽  
Yan Wen Tian
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Solid State Reaction Method ◽  
Luminescence Spectra ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
Red Phosphor ◽  
Milling Method

The pure phase red phosphor yttrium borate doped with Eu3+was prepared by a new solid state reaction named high temperature ball milling method. The phosphor was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and luminescence spectra. The results show that the single phase YBO3:Eu3+phosphor was obtained at 600°C, which is obviously decreased in contrast to conventional solid state reaction method. The particles are approximately nanometer size with narrow distribution range and spherical morphology. In emission spectra, the strongest peak at 597nm is due to the transition5D0→7F1 of Eu3+ions under 394nm monitoring wavelength. The luminescent properties of YBO3:Eu3+phosphor with 25 mol% doping concentration of Eu3+is optimal.

The Preparation of CaMgSi2O6: Eu3+,Li+ Red Phosphor

2011 ◽  
Vol 55-57 ◽  
pp. 413-417 ◽  
Author(s):  
Ren Qing Wang
Keyword(s):  
Red Light ◽  
Luminescent Properties ◽  
Raw Material ◽  
X Ray Diffraction ◽  
Phosphor Particle ◽  
Solid State Method ◽  
Red Phosphor ◽  
Structure Morphology ◽  
New Type ◽  
Ultraviolet Ray

SiO2, CaO and MgO was chosen as main raw material and Solid State method was used to prepare the samples. The precursor was directly sintered at 1000°Cfor 3h to obtain new green CaMgSi2O6:Eu3+,Li+Phosphors.The effects of the content of the doping ions Eu3+ on the luminescent properties have been studied. The structure, morphology and luminescent properties of the phosphors were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM),UV and PL-PLE spectra respectively.The results showed that the CaMgSi2O6:Eu3+,Li+ was base-centered monoclinic crystals, the phosphor particle distributed uniformly.The phosphor has a strong absorptive capacity excited by 248 nm ultraviolet ray, and could emit the strong red light with the wavelength of 590nm(5D0→7F1)and 615nm(5D0→7F2). The CaMgSi2O6:Eu3+,Li+ is a new type of red fluorescent material.

Synthesis and Luminescence Property of Sr3Al2O6:Eu3+ Red Phosph or Prepared by Co-Precipitation Technique

2015 ◽  
Vol 1096 ◽  
pp. 486-491 ◽  
Author(s):  
Hong Mei Gao ◽  
Feng Yun Yan ◽  
Ling He
Keyword(s):  
Emission Spectrum ◽  
Thermal Quenching ◽  
Luminescent Properties ◽  
Average Diameter ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
Ultraviolet Excitation ◽  
Near Ultraviolet ◽  
Co Precipitation

Sr3Al2O6:Eu3+ red phosphor was synthesized by co-precipitation and investigated their crystal structures and luminescent properties in detail. EuCl3 was used as rare earth sources to replace Eu2O3, which saving cost significantly. X-ray diffraction(XRD) and scanning electron microscopy (SEM) result indicated that the as-prepared phosphors was calcined at 1150 oC for 2h crystalized in cubic phase with space group of Pa-3 and uniform morphology. The average diameter of the phosphors were 1.8um. Excitation spectrum and emission spectrum results shows when Boric acid was added 3wt% and Eu3+ was added x=0.04((Sr1-xEux)3Al2O6), the red emission of Eu3+ centers was shown at peak of 611nm under near ultraviolet excitation with wavelength of 393nm. The emission spectrum was line spectrum. Luminous intensity achieved the optimum. The thermal quenching experiments indicated that it had thermal stability in the temperature of 20 oC -80 oC.

scholarly journals Luminescence properties of Mn4+-doped CaAl2O4as a red emitting phosphor for white LEDs

2021 ◽  
Vol 63 (3) ◽  
pp. 3-7
Author(s):  
Thi Kim Chi Nguyen ◽  
◽  
Duy Hung Nguyen ◽  
Tan Vinh Le ◽  
Thanh Vu Tran ◽  
...  
Keyword(s):  
Great Promise ◽  
White Led ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
White Leds ◽  
Broadband Emission ◽  
Structure Morphology ◽  
Red Luminescence ◽  
Co Precipitation ◽  
Red Emitting Phosphor

A series of Mn4+-activated CaAl2O4 (CAO) compounds were synthesized by co-precipitation to seek a candidate for a red-emitting phosphor to be employed in a white LED. The crystal structure, morphology, and fluorescence properties of the as-obtained phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL). The deep red luminescence of Mn4+ in CaAl2O4 is reported and discussed. The excitation spectrum exhibited broadband emission between 260 and 550 nm with three peaks dominating at 320 nm due to the transition of 4A24T1. Theemission spectra between 600 to 720 nm displays an overwhelming emission peak at 654 nm owing to the 2E4A2 transition of Mn4+ ion.This research demonstrates the great promise of CaAl2O4:Mn4+ as a commercial red phosphor in warm white LEDs and opens up new avenues for the exploration of novel non-rare-earth red-emitting phosphors.

Synthesis and Luminescent Properties of Eu3+ Doped Double Molybdate Phosphors

2011 ◽  
Vol 211-212 ◽  
pp. 213-216 ◽  
Author(s):  
Zhi Yong Zhang ◽  
Yong Yang ◽  
Wei Li
Keyword(s):  
Single Phase ◽  
Broad Band ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Solid State Reaction Method ◽  
Double Molybdate ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
Diffraction Patterns ◽  
Narrow Bands

A series of trivalent europium (Eu3+) doped double molybdate phosphors (MLa(MoO4)2, M = Li, Na, K) have been prepared via traditional solid state reaction method at 500-800 °C. Their crystal structures and luminescent properties have been investigated, finding that the phosphors take on single phase through X-ray diffraction patterns (XRD) sintered at 600, 700 and 800 °C for lithium, soldium and potassium salt, respectively.Their excited spectra consist of a broad band and three absorptions, in which the higher peaks locate at 400 nm and 470 nm in the region of 350-500 nm. Excited with 470 nm, the emission spectra are composed of four narrow bands and the strongest emission peak is located at 615 nm. The appropriate doping concentration of Eu3+was 10 mol% for the 615 nm emission. The results indicate that this Eu3+activated NaLa(MoO4)2phosphors are promising yellowish red phosphor for ultraviolet (UV) and blue InGaN-based white LED.

Ten-Vertex Polyhedral Monocarbaborane Chemistry. The Novel High-Yield Formation of the Ten-Vertex closo Compound [6-(PMe2Ph)-closo-1-CB9H9] from the Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11]

1993 ◽  
Vol 58 (12) ◽  
pp. 2924-2935 ◽  
Author(s):  
Jane H. Jones ◽  
Bohumil Štíbr ◽  
John D. Kennedy ◽  
Mark Thornton-Pett
Keyword(s):  
Nmr Spectroscopy ◽  
Diffraction Analysis ◽  
High Yield ◽  
Monoclinic Space Group ◽  
The Novel ◽  
X Ray Diffraction ◽  
Metal Centre ◽  
X Ray ◽  
Yield Formation ◽  
Boiling Toluene

Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11] in boiling toluene solution results in an elimination of the platinum centre and cluster closure to give the ten-vertex closo species [6-(PMe2Ph)-closo-1-CB9H9] in 85% yield as a colourles air stable solid. The product is characterized by NMR spectroscopy and single-crystal X-ray diffraction analysis. Crystals (from hexane-dichloromethane) are monoclinic, space group P21/c, with a = 903.20(9), b = 1 481.86(11), c = 2 320.0(2) pm, β = 97.860(7)° and Z = 8, and the structure has been refined to R(Rw) = 0.045(0.051) for 3 281 observed reflections with Fo > 2.0σ(Fo). The clean high-yield elimination of a metal centre from a polyhedral metallaborane or metallaheteroborane species is very rare.

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...

scholarly journals An accelerated and effective synthesis of zinc borate from zinc sulfate using sonochemistry

2020 ◽  
Vol 43 (1) ◽  
pp. 7-14
Author(s):  
Ali Can Ersan ◽  
Azmi Seyhun Kipcak ◽  
Meral Yildirim Ozen ◽  
Nurcan Tugrul
Keyword(s):  
Inorganic Compounds ◽  
Zinc Borate ◽  
High Yield ◽  
X Ray Diffraction ◽  
Ultrasonic Probe ◽  
Minimum Particle Size ◽  
Effective Synthesis ◽  
Ft Ir ◽  
Lower Temperature ◽  
Borate Compound

AbstractRecently, sonochemistry has been used for the synthesis of inorganic compounds, such as zinc borates. In this study using zinc sulphate heptahydrate (ZnSO4·7H2O) and boric acid (H3BO3) as starting materials, a zinc borate compound in the form of Zn3B6O12·3.5H2O was synthesized using an ultrasonic probe. Product’s characterization was carried out with using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR) and Raman spectroscopy. Zinc borate compound’s chemical bond structure was observed with Raman and FTIR. From the XRD results it was seen that Zn3B6O12·3.5H2O can be quickly synthesized upon heating at 80°C and 85°C (55 min) or 90°C (45 min) in very high yield (>90%). The minimum particle size obtained was ~143 μm from the SEM results. Zinc borate compound was synthesized at a lower temperature in less time than other synthesized zinc metal compound in literature.

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