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.

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.

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.

REMO4 (RE = Y, Gd; M = Nb, Ta) phosphors from hybrid precursors: Microstructure and luminescence

2008 ◽  
Vol 23 (3) ◽  
pp. 679-687 ◽  
Author(s):  
Xiuzhen Xiao ◽  
Bing Yan
Keyword(s):  
Energy Transfer ◽  
Transfer Process ◽  
Energy Transfer Process ◽  
Luminescent Properties ◽  
Concentration Quenching ◽  
Emission Lines ◽  
Rare Earth Ion ◽  
Red Emission ◽  
Characteristic Emission

In this paper, YNbO4:0.05Tb3+ and GdTaO4:0.05Eu3+ phosphors were chosen to study the influence of the firing temperature on the phase and morphologies using novel modified in situ chemical coprecipitation technology. Results show that until the temperature reaches 1000 °C, the formation of YNbO4 and GdTaO4 were realized; with the increasing firing temperatures, those samples present better crystalline structure and better morphologies. The luminescent properties of Eu3+ and Tb3+ have shown that after calcinations at 1000 °C, the intensity of Eu3+ and Tb3+ increases strongly with the increasing of the calcinations temperature, while remaining relatively unchanged at the temperatures ranging between 600 and 800 °C. Furthermore, other rare earth ion doped GdTaO4 and Y1−xGdxTaO4:5 mol% Eu3+ with the different yttrium content were also synthesized after calcinating at the preferable temperature using the same method. The photoluminescence of Y1−xGdxTaO4:5 mol% Eu3+ revealed that the red emission intensity of Eu3+ increases with the increasing of gadolinium content, indicating that Gd ion plays an important role in the energy transfer process. Also, the concentration quenching has been studied in the GdTaO4:Eu3+/Dy3+ systems. Moreover, the characteristic emission lines of Tb3+, Pr3+, and Er3+ in GdTaO4 were observed, showing that the energy transfer process appears between host and those activators.

Luminescent properties of Eu3+-doped SmBa3B9O18

2013 ◽  
Vol 28 (S1) ◽  
pp. S41-S44 ◽  
Author(s):  
Ming He ◽  
Z.H. Zhang ◽  
Y.Z. Zhu ◽  
Y.G. Tang ◽  
Z. Song
Keyword(s):  
Luminescent Properties ◽  
Optical Devices ◽  
Concentration Quenching ◽  
Solid State Reactions ◽  
Luminescent Materials ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Eu3+-doped SmBa3B9O18 luminescent materials were synthesized by high temperature solid state reactions. The structure and photoluminescence properties of Sm(1−x)EuxBa3B9O18 (x = 0.2, 0.4, and 0.6) were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and photoluminescence spectra. The results show that doping of Eu3+ ions does not change the structure of SmBa3B9O18. The luminescence is mainly the characteristic Eu3+ ion luminescence. No concentration quenching processes occur with the increment of Eu3+ concentration. The work implies that SmBa3B9O18 is a potential host material and europium-doped SmBa3B9O18 may find application in display and optical devices.

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.

scholarly journals Preparation and spectroscopic properties of Ca2MgTeO6:Tm3+ blue-emitting tellurate phosphors

2020 ◽  
Vol 213 ◽  
pp. 01034
Author(s):  
Sumeng Jiang ◽  
Fanhua Zeng ◽  
Hui Liu ◽  
Yan Duan ◽  
Bin Deng
Keyword(s):  
Doping Concentration ◽  
Blue Emission ◽  
Dipole Interaction ◽  
Spectroscopic Properties ◽  
Concentration Quenching ◽  
Quenching Mechanism ◽  
X Ray ◽  
Chromaticity Coordinates ◽  
Cie Chromaticity ◽  
Optimum Doping Concentration

Various novel Ca2MgTeO6:Tm3+ blue-emitting tellurate materials were synthesized via solid-state reaction. The structure and phase purity of prepared Ca2MgTeO6:xTm3+ (x = 0.0025-0.10 mol) were examined by X-ray powder diffraction. The Ca2MgTeO6:Tm3+ phosphors emit blue emission at 359 nm excitation. The optimum doping concentration was 0.02 mol. The concentration quenching mechanism in the Ca2MgTeO6 host was due to the electric dipole-dipole interaction. The The CIE chromaticity coordinates of Ca2MgTeO6:Tm3+ phosphors located in the blue region. These results validated the Ca2MgTeO6:Tm3+ tellurate phosphor can be used as good blue-emitting candidate for W-LEDs.

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.

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