The Size Confinement Effect for Eu3+ Concentration Quenching and Energy Transfer in YVO4 Nanocrystal

2016 ◽  
Vol 16 (4) ◽  
pp. 3772-3776 ◽  
Author(s):  
Qingyu Meng ◽  
Jiaqi Dai ◽  
Wenjun Sun ◽  
Changwen Wang
Keyword(s):  
Energy Transfer ◽  
Exchange Interaction ◽  
Electric Dipole ◽  
Dipole Interaction ◽  
Concentration Quenching ◽  
Confinement Effect ◽  
Precipitation Method ◽  
Range Interaction ◽  
Operating Range ◽  
Size Confinement

YVO4:Eu3+ nanocrystal powders (∼30 nm) with different doping concentrations were prepared using a precipitation method. Bulky powders (∼500 nm) were obtained by annealing the nanopowders at high temperature. The concentration quenching of luminescent centers and energy transfer in YVO4: Eu3+ powders were investigated. It was found that quenching concentration for Eu3+ 5D0→7F2 transition emission in nanopowders is distinctly higher than that in bulk powders. The type of energy transfer that caused concentration quenching was identified to be electric dipole–dipole interaction in bulk powders and exchange interaction in nanopowders. The electric dipole–dipole interaction is a long-range interaction (operating range of several nanometers). The size confinement effect of boundary in nanoparticles has obvious inhibitory effect on electric dipole–dipole interaction, and hardly affect the exchange interaction which is a short-range interaction (operating range several angstroms). The electric dipole–dipole interaction is restrained by particle boundary in nanopowders. So energy transfer of Eu3+ ions in nanomaterials is dominated by exchange interaction, and quenching concentration of nanomaterials is higher than in bulky materials.

scholarly journals Ce3+/Eu2+ Doped Al2O3 Coatings Formed by Plasma Electrolytic Oxidation of Aluminum: Photoluminescence Enhancement by Ce3+→Eu2+ Energy Transfer

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 819 ◽  
Author(s):  
Stevan Stojadinović ◽  
Aleksandar Ćirić
Keyword(s):  
Energy Transfer ◽  
Electric Dipole ◽  
Plasma Electrolytic Oxidation ◽  
Dipole Interaction ◽  
Critical Distance ◽  
Visible Spectral Range ◽  
Electrolytic Oxidation ◽  
Phase And Chemical Composition ◽  
Plasma Electrolytic ◽  
Overlap Method

Plasma electrolytic oxidation (PEO) of aluminum in electrolytes containing CeO2 and Eu2O3 powders in various concentrations was used for creating Al2O3 coatings doped with Ce3+ and Eu2+ ions. Phase and chemical composition, surface morphology, photoluminescence (PL) properties and energy transfer from Ce3+ to Eu2+ were investigated. When excited by middle ultraviolet radiation, Al2O3:Ce3+/Eu2+ coatings exhibited intense and broad emission PL bands in the ultraviolet/visible spectral range, attributed to the characteristic electric dipole 4f05d1→4f1 transition of Ce3+ (centered at about 345 nm) and 4f65d1→4f7 transition of Eu2+ (centered at about 405 and 500 nm). Due to the overlap between the PL emission of Al2O3:Ce3+ and the PL excitation of Al2O3:Eu2+, energy transfer from Ce3+ sensitizer to the Eu2+ activator occurs. The energy transfer is identified as an electric dipole–dipole interaction. The critical distance between Eu2+ and Ce3+ ions in Al2O3 was estimated to be 8.6 Å by the spectral overlap method.

scholarly journals Luminescence Properties and Energy Transfer of Tm3+-Eu3+ double Doped LiLaSiO4 Phosphors

2021 ◽  
Author(s):  
Xiulan Wu ◽  
Liang Du ◽  
Qiang Ren ◽  
Ou Hai
Keyword(s):  
Energy Transfer ◽  
Electric Dipole ◽  
Solid Phase ◽  
Intensity Variation ◽  
Concentration Quenching ◽  
Luminous Intensity ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Color Control ◽  
Fluorescence Spectrometer

Abstract A series of LiLaSiO4:yTm3+, zEu3+ phosphors were prepared by high temperature solid-phase reaction. The microstructure, luminescence performance and quantum yield of the phosphors are characterized by XRD, SEM and fluorescence spectrometer. When the monitoring wavelength is 360 nm, LiLaSiO4:yTm3+ phosphors showed a sharp emission peak at 460 nm, corresponding to the 7F0→5D2 energy level transition, and the concentration quenching point of Tm3+ ions was y = 0.015. When the monitoring wavelength is 360 nm, LiLaSiO4:yTm3+, zEu3+ phosphors have emission peaks of Tm3+ and Eu3+ ions at 460 and 618 nm, respectively. As the molar mass fraction of Eu3+ ions doped increases, the luminous intensity of Tm3+ ions gradually decrease, and the luminous intensity of Eu3+ ions increases first and then decreases, and the concentration quenching point of Eu3+ ions was z = 0.08. The energy transfer of Tm3+→Eu3+ ions through electric dipole- electric dipole interactions is demonstrated by the luminous intensity variation law and fluorescence lifetime. By changing the doping ratio of Eu3+ and Tb3+ ions, the full-color control of the phosphor luminescent color from blue to red can be achieved.

Luminescence Properties of Europium-Doped Yttrium Oxides Derived from Their Dodecylsulfate-Templated Mesostructure and Nanotube Forms

2003 ◽  
Vol 775 ◽  
Author(s):  
Tsuyoshi Kijima ◽  
Kenichi Iwanaga ◽  
Tomomi Hamasuna ◽  
Shinji Mohri ◽  
Mitsunori Yada ◽  
...  
Keyword(s):  
Room Temperature ◽  
Broad Band ◽  
Concentration Quenching ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Bulk Materials ◽  
Main Band ◽  
Homogeneous Precipitation Method ◽  
Order Of Magnitude ◽  
Weak Luminescence

AbstractEuropium-doped hexagonal-mesostructured and nanotubular yttrium oxides templated by dodecylsulfate species as well as surfactant free bulk oxides were synthesized by the homogeneous precipitation method. All the as grown nanostructured or bulk materials with amorphous or poorly crystalline frameworks showed weak luminescence bands at room temperature. On calcination at 1000°C these materials were converted into highly crystalline yttrium oxides, resulting in a total increase in intensity of all the bands by one order of magnitude. In the hexagonal-mesostructured system, the main band due to the 5D0-7F2 transition for the calcined phases showed a sharp but asymmetrical multiplet splitting indicating multiple Eu sites. Concentration quenching was found at a Eu content of 3 mol% or above for these phases. In contrast, the main emission for the calcined solids in the nanotubular system occurred as poorly resolved broad band and the intensity of the main band at higher Eu content was significantly enhanced compared with those for the other two systems.

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.

Synthesis, crystal structure and photoluminescence properties of Eu2+-activated RbCaGd(PO4)2 phosphors

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11211-11217 ◽  
Author(s):  
Xue Chen ◽  
Qidi Wang ◽  
Fengzhu Lv ◽  
Paul K. Chu ◽  
Yihe Zhang
Keyword(s):  
Crystal Structure ◽  
Sol Gel ◽  
Dipole Interaction ◽  
Concentration Quenching ◽  
Photoluminescence Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
First Time

RbCaGd(PO4)2:Eu2+ was prepared by the Pechini-type sol–gel method. The crystal structure was determined in the first time. The dipole–dipole interaction plays a major role in the mechanism of concentration quenching of Eu2+ in this phosphor.

Ce:LaB3O6 glass for high-resolution radiation dosimetry

2022 ◽  
Author(s):  
Dongsheng Yuan ◽  
Encarnación G. Víllora ◽  
Takumi Kato ◽  
Daisuke Nakauchi ◽  
Takayuki YANAGIDA ◽  
...  
Keyword(s):  
High Resolution ◽  
Quantum Efficiency ◽  
Linear Dependence ◽  
Interatomic Distance ◽  
Irradiation Dose ◽  
Radiation Dosimetry ◽  
Dipole Interaction ◽  
Concentration Quenching ◽  
Optimum Concentration ◽  
Reducing Atmosphere

Abstract Ce:LaB3O6 (LBO) glass, whose constituents are abundant elements and fabrication is easy and cheap, is found to be a promising thermoluminescence (TL) dosimeter. This is originally achieved by CeF3 doping and melting under a reducing atmosphere, with the optimum concentration of 0.1% (quantum efficiency = 66%). The corresponding Ce interatomic distance is ~ 4 nm, below which concentration quenching occurs via Ce dipole-dipole interaction, as elucidated experimentally by Dexter’s theory. Ce:LBO exhibits a good dose resolution, with a linear dependence covering five orders of magnitude on both irradiation-dose and TL-response. Furthermore, it can be cyclically irradiated and read without degradation.

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