Effect of Er and Yb Doping Concentration on the Luminescent Properties of Y2O2S:Yb, Er Phosphors

2010 ◽  
Vol 663-665 ◽  
pp. 381-384
Author(s):  
Peng De Han ◽  
Le Zhang ◽  
Yan Chen ◽  
Li Xi Wang ◽  
Qi Tu Zhang
Keyword(s):  
Emission Intensity ◽  
Doping Concentration ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Luminescent Intensity ◽  
Flux Method ◽  
Red Emission

Up-conversion luminescent materials of Y2O2S:Yb, Er with different doping concentrations of Er3+ ion (1 mol%–6 mol%) and Yb3+ ion (4 mol%–16 mol%) were prepared by flux method. As Yb3+ doping concentration was fixed at 8 mol%, when Er3+ doping concentration was 2 mol%, the green and red up-conversion luminescent intensity reached the maximum. As Er3+ doping concentration was fixed at 2 mol%, when Yb3+ doping concentration was 4 mol%, the green and red emission intensity reached the maximum. The up-conversion luminescent colours were adjustable.

Effect of Doping Concentration on the up-Conversion Luminescent Properties of Y2O2S:Yb, Tm Phosphors

2011 ◽  
Vol 197-198 ◽  
pp. 558-562 ◽  
Author(s):  
Peng De Han ◽  
Xiao Gu Huang ◽  
Qi Tu Zhang
Keyword(s):  
Emission Intensity ◽  
Doping Concentration ◽  
Blue Emission ◽  
Luminescent Properties ◽  
Concentration Quenching ◽  
Luminescent Materials ◽  
Luminescent Intensity ◽  
Nonradiative Transition ◽  
Flux Method ◽  
Red Emission

Up-conversion luminescent materials of Y2O2S: Yb, Tm with different doping concentrations of Tm3+ion (0.5 mol%–4 mol %) and Yb3+ion (4 mol%–16 mol %) were prepared by flux method. As Tm3+doping concentration was 1 mol% and Yb3+doping concentration was 8 mol%, the blue and red up-conversion luminescent intensity reached the maximum. The concentration quenching of Tm3+was due to the reducing of the distance between Tm3+ions and the cross-relaxation increasing. The concentration quenching of Yb3+was attributed to increasing of nonradiative transition. The blue emission intensity of1G4→3H6was always weaker than the red emission intensity of3F3→3H6, and the blue emission intensity of1G4→3H6is similar with the red emission intensity of1G4→3F4.

Upconversion luminescence of cerium-stabilized high temperature phase zirconia phosphors with a high Er3+ doping concentration

RSC Advances ◽  
2015 ◽  
Vol 5 (130) ◽  
pp. 107857-107863 ◽  
Author(s):  
Lili Cao ◽  
Yongqiang Zhou ◽  
Weidong Xiang ◽  
Dewu Yin ◽  
Xiaojuan Liang ◽  
...  
Keyword(s):  
High Temperature ◽  
Emission Intensity ◽  
Doping Concentration ◽  
Upconversion Luminescence ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Red Emission

As the Er3+ concentration increases, the luminescence can be tuned from green to red and the red emission intensity reaches its maximum with an Er3+ concentration as high as 10 mol%.

Synthesis and Luminescent Properties of CaSnO3:Eu Nanopowder Prepared by a Sol–Gel Route

2016 ◽  
Vol 16 (4) ◽  
pp. 3865-3868 ◽  
Author(s):  
Xiaoyan Fu ◽  
Tuyuan Zhao ◽  
Yan Zhang ◽  
Yibin Chen ◽  
Hongwu Zhang
Keyword(s):  
Sol Gel ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Potential Candidate ◽  
Excitation Band ◽  
Transfer Energy ◽  
High Quality ◽  
Red Emission ◽  
Red Phosphors ◽  
The Eu

Luminescent properties of nanocrystalline CaSnO3:1%Eu have been investigated in order to develop novel red phosphors. The results indicate that high-quality nanoparticles with controlled stoichiometry and microstructure were prepared by a sol–gel method using citric acid and EDTA as complexes. There are two broad excitation bands located at 240 and 270 nm existing in the excitation spectrum in addition to the characteristic excitation peaks of Eu3+. Further investigations show that the excitation band located at 240 nm can be assigned to the host absorption while the Eu–O charge transfer is responsible for the 270 nm excitation band. These results indicate that the host can efficiently transfer energy to the Eu3+ ions. The more important is that since the symmetry of Eu3+ ions is lower, the pure red emission (5D0 → 7F2 transition located at 618 nm) is predominant over all the emission. This mean CaSnO3:Eu is a potential candidate for red luminescent materials.

Combustion Synthesis of CaMoO4:Eu3+, Li+ Red Phosphors Using Urea-Thiourea Mixture Fuels

2013 ◽  
Vol 652-654 ◽  
pp. 546-549
Author(s):  
Xia Wang ◽  
Yu Zhi Feng ◽  
Gui Hua Peng ◽  
Zhen Hua Liang ◽  
Xiao Bao Han
Keyword(s):  
Combustion Synthesis ◽  
Crystalline Phase ◽  
Tetragonal Phase ◽  
Luminescent Properties ◽  
Luminescent Intensity ◽  
Red Emission ◽  
Red Phosphors ◽  
Chromaticity Coordinates ◽  
Standard Values ◽  
Diffraction Peaks

The CaMoO4:Eu3+, Li+ red phosphors were synthesized by combustion synthesis with urea or urea-thiourea as fuels, and their crystalline phase, morphology and luminescent properties were investigated. The XRD results demonstrated that all the diffraction peaks of the products can be well indexed to the pure tetragonal phase of CaMoO4. The SEM photographs showed that the particles of sample using urea as fuel are agglomeration, while the particles of sample using urea-thiourea mixture fuels are non-agglomeration. The powder can be effectively excited by ultraviolet with wavelength of 395 nm, and exhibits a strong red emission with maximum wavelength at 615 nm. The luminescent intensity of the phosphor with mixture fuels had 2.2 times stronger than that of the phosphor with single fuel, and its chromaticity coordinates (0.65, 0.35) was closer to NTSC standard values (0.67, 0.33).

Study on the Luminescent Properties of Europium (III) Complex with 2, 3-Pyrazinedicarboxylic Acid

2013 ◽  
Vol 643 ◽  
pp. 60-63
Author(s):  
Li Hua Wang
Keyword(s):  
Metal Ions ◽  
Organic Solvents ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Luminescent Intensity ◽  
The Eu

Two new europium (III) complexes luminescent materials, Eu-PDA and Eu-PDA-Phen, were prepared by the reaction of Eu(NO3)3·6H2O with 2, 3-pyrazinedicarboxylic acid (PDA) and 1,10-phenanthroline, respectively. The luminescent properties of two europium (III) complexes in solid and in organic solvents have been studied. The effect of organic solvents and metal ions (Ca2+ and Mg2+) on the luminescent intensity of the Eu (III) complexes have also been investigated. The results show that the metal ions (Ca2+ and Mg2+) could enhance the luminescent intensity of Eu-PDA-Phen complex and reduce luminescent intensity of Eu-PDA complex. The polarity of organic solvents is an important factor on the luminescent intensity of two complexes.

scholarly journals Effect of Eu3+ doping concentration on the structural and luminescence properties of NaYF4: Eu3+ nanoparticles

2020 ◽  
Vol 5 (1) ◽  
pp. first
Author(s):  
Cao Thi My Dung ◽  
Tran Thi Thanh Van ◽  
Lê Thuy Thanh Giang
Keyword(s):  
Emission Intensity ◽  
Doping Concentration ◽  
Solvothermal Method ◽  
Luminescent Properties ◽  
Hexagonal Structure ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optimal Doping Concentration ◽  
Xrd Patterns

In our study, hexagonal-NaYF4: Eu3+ nanoparticles were synthesized by the solvothermal method at 180◦C for 24 hours. The typical vibrational spectrum showed the appearance of characteristic organic modes of oleic acid in the sample. The presence of elements such as Na, Y, F and Eu was indicated in the energy-dispersive X-ray spectroscopy (EDX). X-ray diffraction (XRD) patterns revealed that the NaYF4 host possessed the hexagonal structure when the doping contents below 5 mol%. At the Eu3+ amount of 10 mol%, the XRD appeared additional peaks of cubic phase of NaYF4 host. Both XRD and TEM data showed that the crystal sizes increase slightly as a function of Eu3+ doping concentration. Under an excitation at 395 nm, photoluminescence (PL) spectra revealed that the ratio of emission intensity between orange and red were controlled by changing the doping concentration. The optimal doping concentration was about 7 mol% for achieving the highest emission intensity. Moreover, PL data also demonstrated that a part of ions Eu3+ could occupy at Y3+ sites in the crystal structure of NaYF4. Because of their outstanding luminescent properties, NaYF4:Eu nanoparticles would the potential material for applications in biomedical medicine, optoelectronics.

Fabrication of Bifunctional SiO2/Europium-Polyoxometalates/Ag Particles and their Luminescence and Catalysis Properties

2013 ◽  
Vol 575-576 ◽  
pp. 216-224
Author(s):  
Jun Wang ◽  
Shao Hua Fan ◽  
Wei Qian Zhao ◽  
Wu Ke Li ◽  
Xue Lian Lu
Keyword(s):  
Main Product ◽  
Catalytic Properties ◽  
Uv Light ◽  
Luminescent Properties ◽  
Silica Spheres ◽  
Hybrid Particles ◽  
Red Emission ◽  
Transmission Electron ◽  
Ag Particles ◽  
Luminescent Spectra

In this paper, Stöber silica particles were decorated with polyethyleneimine and silver nanoparticles and Eu-polyoxometalates were grafted on the surface of polyethyleneimine/silica spheres. The hybrid SiO2/Eu-polyoxometalates/Ag particles were characterized by IR, UVvis, luminescent spectra, scanning electron microscopy, transmission electron microscope, and cyclic voltammetry (CV), respectively. The hybrid particles show the bright red emission under UV light which can be observed by naked eyes. The luminescent properties of particles have been investigated which show that Ag nanoparticles have an influences on the luminescence of europium ions. The electrochemical activities of SiO2/Eu-polyoxometalates/Ag particles have been demonstrated by CV measurement. The catalytic results indicate that the hybrid particles show the catalytic properties in the oxidation of styrene and benzaldehyde is the main product of the reaction.

High red emission intensity of Eu:Y2O3 films grown on Si(1 0 0)/Si(1 1 1) by electron beam evaporation

2014 ◽  
Vol 148 ◽  
pp. 186-191 ◽  
Author(s):  
V.A.G. Rivera ◽  
F.A. Ferri ◽  
J.L. Clabel H. ◽  
M.A. Pereira-da-Silva ◽  
L.A.O. Nunes ◽  
...  
Keyword(s):  
Electron Beam ◽  
Emission Intensity ◽  
Electron Beam Evaporation ◽  
Red Emission

scholarly journals Thermal Stability and Luminescent Properties of Tri-cellulose Acetate Composites Containing Dy(SSA)3Phen Complex

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Xiangwei Sun ◽  
Feiyue Wu ◽  
Yan Luo ◽  
Mengjun Huang ◽  
Yuntao Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Cellulose Acetate ◽  
Ternary Complex ◽  
Fluorescence Spectra ◽  
Luminescent Properties ◽  
Rare Earth Complex ◽  
Luminescent Materials ◽  
Sulfosalicylic Acid ◽  
Composition And Structure ◽  
Fluorescent Materials

Dysprosium (Dy) ternary complex was prepared using 5-sulfosalicylic acid (SSA) as the first ligand and 1,10-phenanthroline (Phen) as the second ligand, denoted as Dy(SSA)3Phen. The complex was blended with tri-cellulose acetate (TCA) via a cosolvent method to obtain polymer luminescent materials. The composition and structure of the rare-earth complex were characterized by means of elemental analysis, infrared (IR) spectra, and thermogravimetric analysis (TGA). The fluorescence spectra displayed this pure Dy(SSA)3Phen complex, and the TCA/Dy(SSA)3Phen composites all emit blue light. The (90/10) composite possesses fine luminescent properties with quantum yield of 33.5% and thermal stability for potential usage as blue fluorescent materials.

Sign in / Sign up

Export Citation Format

Share Document