Preparation and luminescent properties of CaCO3:Eu3+ hollow sphere by co-precipitation method

2019 ◽  
Vol 200 (1) ◽  
pp. 16-25
Author(s):  
Guilin Yan ◽  
Xinru Xu ◽  
Xinmiao Yu ◽  
Teshen Wang ◽  
Jiangguo Xiao ◽  
...  
Keyword(s):  
Hollow Sphere ◽  
Luminescent Properties ◽  
Precipitation Method ◽  
Co Precipitation

scholarly journals Structure, Luminescence, and Magnetic Properties of Crystalline Manganese Tungstate Doped with Rare Earth Ion

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3717
Author(s):  
Jae-Young Jung ◽  
Soung-Soo Yi ◽  
Dong-Hyun Hwang ◽  
Chang-Sik Son
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Sintering Temperature ◽  
Luminescent Properties ◽  
Concentration Quenching ◽  
Rare Earth Ions ◽  
Precipitation Method ◽  
Rare Earth Ion ◽  
Co Precipitation ◽  
Quenching Phenomenon

The precursor prepared by co-precipitation method was sintered at various temperatures to synthesize crystalline manganese tungstate (MnWO4). Sintered MnWO4 showed the best crystallinity at a sintering temperature of 800 °C. Rare earth ion (Dysprosium; Dy3+) was added when preparing the precursor to enhance the magnetic and luminescent properties of crystalline MnWO4 based on these sintering temperature conditions. As the amount of rare earth ions was changed, the magnetic and luminescent characteristics were enhanced; however, after 0.1 mol.%, the luminescent characteristics decreased due to the concentration quenching phenomenon. In addition, a composite was prepared by mixing MnWO4 powder, with enhanced magnetism and luminescence properties due to the addition of dysprosium, with epoxy. To one of the two prepared composites a magnetic field was applied to induce alignment of the MnWO4 particles. Aligned particles showed stronger luminescence than the composite sample prepared with unsorted particles. As a result of this, it was suggested that it can be used as phosphor and a photosensitizer by utilizing the magnetic and luminescent properties of the synthesized MnWO4 powder with the addition of rare earth ions.

Fabrication and Luminescence Properties of CaMoO4:Eu3+ Red Phosphors for White LED

2010 ◽  
Vol 663-665 ◽  
pp. 441-444
Author(s):  
Zhen Hua Liang ◽  
Yu Zhi Feng ◽  
Xiao Xia Liu ◽  
Gui Hua Peng
Keyword(s):  
Luminescent Properties ◽  
Luminescence Properties ◽  
Precipitation Method ◽  
White Led ◽  
Doping Amount ◽  
Red Phosphors ◽  
Co Precipitation ◽  
The Relationship

CaMoO4: Eu3+ red phosphors were synthesized by co-precipitation method with H3BO3 as an additive and the relationship between H3BO3 doping amount and luminescent properties were studied. The brightness increased with increasing H3BO3 amount, the brightness of the CaMoO4: Eu3+ powder with 10 mol％ H3BO3 was 3.2 times higher than that of the phosphor without H3BO3.

A Study on Orthogonal Experiments of YAG: Ce3+ Yellow Phosphor for White LED

2011 ◽  
Vol 216 ◽  
pp. 383-387 ◽  
Author(s):  
Rong Feng Guan ◽  
Qin Qin Li ◽  
Shuai Mou Li
Keyword(s):  
Orthogonal Experiment ◽  
Luminescent Properties ◽  
Precipitation Method ◽  
Prepared Phosphor ◽  
Luminescent Materials ◽  
White Led ◽  
Yellow Phosphor ◽  
Sintering Time ◽  
Orthogonal Experiments ◽  
Co Precipitation

The YAG yellow phosphor was synthesized by Co-precipitation Method and its luminescent properties were characterized. The Orthogonal Experiment results that under laboratory conditions, the prepared phosphor luminous intensity reached at the maximum and the optical properties of compound as white up to the best with blue-chip, when calcinations temperature up to 1600°C, sintering time is 3h, the Ce3+content is 0.05.Therefore, the phosphor could provide a theoretical basis for the design and development of white LED with luminescent materials, promoting the practical of white LED.

Nanocrystalline Features of Structure and Luminescent Properties of (Y1−xLax)3(Al1−yGay)5O12:Ce3+ Garnets

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940070
Author(s):  
Yu. V. Bokshits ◽  
G. P. Shevchenko ◽  
E. V. Tratsiak ◽  
S. E. Kichanov
Keyword(s):  
Neutron Diffraction ◽  
Crystalline Structure ◽  
Diffraction Method ◽  
Luminescent Properties ◽  
Precipitation Method ◽  
Partial Substitution ◽  
Co Precipitation ◽  
Neutron Diffraction Method

The compounds of (Y[Formula: see text]Lax)3(Al[Formula: see text]Gay)5O[Formula: see text]:Ce[Formula: see text] compositions with partial substitution of Y[Formula: see text] and Al[Formula: see text] by La[Formula: see text] and Ga[Formula: see text], respectively, were fabricated by the co-precipitation method using different precipitants. Detailed investigations of the crystalline structure were made using the neutron diffraction method. The influence of the precipitant, quantity and type of the substituted ions on the structural and luminescent properties of the compounds was established. Distortion of the oxygen dodecahedron in the crystals has the strongest impact on their luminescent properties.

ChemInform Abstract: Luminescent Properties of Bi3+-Activated Ca2Sb2O7Nano-Phosphor Prepared by Co-Precipitation Method.

ChemInform ◽  
2015 ◽  
Vol 46 (50) ◽  
pp. no-no
Author(s):  
Shiyue Yao ◽  
Xuan Zhou ◽  
Yanling Huang ◽  
Zuoshan Wang ◽  
Yumei Long ◽  
...  
Keyword(s):  
Luminescent Properties ◽  
Precipitation Method ◽  
Co Precipitation

Study on Luminescent Properties of YAG:Ce3+, Gd3+/La3+ Prepared by Co-Precipitation Method

2014 ◽  
Vol 1002 ◽  
pp. 29-34
Author(s):  
Rong Feng Guan ◽  
Ya Jun You ◽  
Juan Song ◽  
Gui Hua Hou
Keyword(s):  
Emission Intensity ◽  
Room Temperature ◽  
Thermal Quenching ◽  
Luminescent Properties ◽  
Ammonium Bicarbonate ◽  
Color Temperature ◽  
Precipitation Method ◽  
Structure Morphology ◽  
Relative Emission Intensity ◽  
Co Precipitation

The YAG:Ce3+, Gd3+/La3+ yellow phosphors were prepared by co-precipitation method with 0.1mol/L ammonium bicarbonate and aqueous ammonia as precipitants, and the crystal structure, morphology, luminescent properties were investigated. The results indicated that the emission peaks of the YAG:Ce3+, Gd3+/La3+ were redshifted from 535nm to 545.5nm /547nm, and the relative emission intensity declined from 330nm to 145/132 with doping content of Gd3+ /La3+ increased from 0 to 0.9mol at room temperature. Compared with Gd-doping phosphors, the redshift of La3+-doping phosphor was larger and the relative emission intensity declined more quickly. Compared with YAG:Ce3+, the thermal quenching characteristics of YAG:Ce,Gd and YAG:Ce,La were noticeably worse when the temperature increased, but the extents of peak wavelength redshifts were almost the same, about is 7-8nm in the experimental temperature range (50-200°C), have little relation with the doping concentration change. Doping concentrations of Gd or La couldn't be too high, and the suitable concentration was less than 0.6mol at the regulating color temperature and color index.

Luminescent properties of Bi3+-activated Ca2Sb2O7 nano-phosphor prepared by co-precipitation method

2015 ◽  
Vol 653 ◽  
pp. 345-350 ◽  
Author(s):  
Shiyue Yao ◽  
Xuan Zhou ◽  
Yanling Huang ◽  
Zuoshan Wang ◽  
Yumei Long ◽  
...  
Keyword(s):  
Luminescent Properties ◽  
Precipitation Method ◽  
Nano Phosphor ◽  
Co Precipitation

Near-Infrared Downconversion in LuPO4: Tm3+, Yb3+ Phosphors

2016 ◽  
Vol 16 (4) ◽  
pp. 3511-3516 ◽  
Author(s):  
Li Li ◽  
Yongjie Wang ◽  
Jun Shen ◽  
Wenxuan Chang ◽  
Tianting Jin ◽  
...  
Keyword(s):  
Tetragonal Phase ◽  
Diffuse Reflectance ◽  
Near Infrared ◽  
Luminescent Properties ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Crystallinity ◽  
Nir Emission ◽  
Co Precipitation

Tm3+ and Yb3+ codoped LuPO4 phosphors were synthesized by the reverse-strike co-precipitation method. The obtained LuPO4:Tm3+, Yb3+ phosphors were characterized by X-ray diffraction (XRD), diffuse reflectance spectra, photoluminescence (PL) spectra, and decay lifetime to understand the observed near-infrared downconversion (DC) phenomena. The XRD results show that all the prepared phosphors can be readily indexed to the pure tetragonal phase of LuPO4 and exhibit good crystallinity. The experimental results showed that the strong visible emission around 649 nm from Tm3+(1G4 → 3F4) and near-infrared (NIR) emission around 1003 nm from Yb3+(2F5/2 → 2F7/2) of LuPO4:Tm3+, Yb3+ phosphors were observed under 468 nm excitation, respectively. The Yb3+ concentration dependence of luminescent properties and lifetimes of both the visible and NIR emissions have also been investigated. The quenching concentration of Yb3+ ions approaches 30 mol%. The DC mechanism is also discussed in detail.

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