Effect of ligand field symmetry on upconversion luminescence in heat‐treated LaBGeO 5 :Yb 3+ , Er 3+ glass

2018 ◽  
Vol 101 (9) ◽  
pp. 4387-4396 ◽  
Author(s):  
Mohamed. A. Ali ◽  
Jinjun Ren ◽  
Xiaofeng Liu ◽  
Jianrong Qiu
Keyword(s):  
Upconversion Luminescence ◽  
Ligand Field ◽  
Heat Treated ◽  
Field Symmetry

scholarly journals Impact of Ag2O Content on the Optical and Spectroscopic Properties of Fluoro-Phosphate Glasses

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3516 ◽  
Author(s):  
Marwa Ennouri ◽  
Luukas Kuusela ◽  
Ifa Jlassi ◽  
Bernard Gelloz ◽  
Laeticia Petit ◽  
...  
Keyword(s):  
Spectroscopic Properties ◽  
Phosphate Glasses ◽  
Radiative Properties ◽  
Ligand Field ◽  
Structural And Optical Properties ◽  
Ag Nps ◽  
Heat Treated ◽  
Field Symmetry ◽  
Quenching Method ◽  
The Impact

Glasses with the system (84.60-x) NaPO3-5 ZnO-(9.40-x) NaF-x Ag2O-1 Er2O3, (x = 0, 2, 4, and 6) (mol%) were synthesized by the conventional melt-quenching method. The impact of the addition of Ag2O on the physical, thermal, structural, and optical properties of the glasses is discussed. The Judd-Oflet analysis was used to evaluate the radiative properties of the emission transitions of the glasses. The enhancement of luminescence properties due to Ag2O is discussed in terms of consequent changes in the local electromagnetic field, symmetry, and the ligand field around the Er3+ ion. The heat treatment of the glass was performed in order to precipitate Ag nanoparticles (NPs), which form as a layer at the surface of the heat-treated glasses as confirmed using scanning electron microscopy (SEM). The Ag NPs were found to increase the intensity of the emission at 1.5 µm.

scholarly journals Ligand-field symmetry effects in Fe(ii) polypyridyl compounds probed by transient X-ray absorption spectroscopy

2012 ◽  
Vol 157 ◽  
pp. 463 ◽  
Author(s):  
Hana Cho ◽  
Matthew L. Strader ◽  
Kiryong Hong ◽  
Lindsey Jamula ◽  
Eric M. Gullikson ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Ligand Field ◽  
X Ray ◽  
Field Symmetry ◽  
X Ray Absorption

Upconversion Luminescence Properties of Er3+ Doped Yb2Ti2O7 Nanophosphor by Gd3+ Codoping

2016 ◽  
Vol 16 (4) ◽  
pp. 3690-3694 ◽  
Author(s):  
B. S Cao ◽  
J. L Wu ◽  
X. H Wang ◽  
Z. Q Feng ◽  
B Dong
Keyword(s):  
Cell Parameter ◽  
Upconversion Luminescence ◽  
Sol Gel ◽  
Nominal Composition ◽  
Face Centered Cubic ◽  
Cubic Crystal ◽  
Crystal Field Symmetry ◽  
Field Symmetry ◽  
Face Centered ◽  
Upconversion Emissions

Er3+ doped Yb2Ti2O7 nanophosphors by Gd3+ codoping with nominal composition of (Er0.05Yb0.95−xGdx)2Ti2O7 (x = 0, 0.2, 0.4, 0.6, 0.8, and 0.95) have been prepared by sol–gel method. −Er3+–Gd3+ codoped Yb2Ti2O7 was characteristic of a typical face-centered cubic crystal phase, and the unit cell parameter increased linearly with the increase of Gd3+ concentration. Under a 976 nm laser diode excitation, both green and red upconversion emissions were observed and the upconversion emissions were enhanced significantly by Gd3+ codoping, showing the strongest green and red emissions at 80 mol% Gd3+ codoping. The intensity ratio of green to red emissions (Igreen/Ired) increased monotonously with the increase of Gd3+ concentration. The energy transfer between Yb3+ and Er3+ and the variation of local crystal field symmetry of Er3+ by the substitution of Yb3+ by Gd3+ ions led to the improvement of upconversion properties of Er3+–Gd3+ codoped Yb2Ti2O7 nanophosphors.

scholarly journals Morphology Manipulation and Upconversion Luminescence Enhancement of β-NaLuF4: Er3+ Hexagonal Microtubes via Sr2+ Doping

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Han Lin ◽  
Zhonggen Wang ◽  
Yan Hong
Keyword(s):  
Reaction Time ◽  
Upconversion Luminescence ◽  
Time Dependent ◽  
Doping Content ◽  
Luminescence Enhancement ◽  
Ion Doping ◽  
Crystal Field Symmetry ◽  
Total Fluorescence ◽  
Field Symmetry ◽  
Red Luminescence

A new and facile strategy to enhance the upconversion luminescence (UCL) emission of NaLuF4: Er3+ microcrystals (MCs) using strontium (Sr) as a dopant has been reported. With the introduction of Sr2+, the products change from long NaLuF4: Er3+ hexagonal microtubes to short hexagonal microtubes and finally to hexagonal microprisms. The growth mechanism is profoundly discussed according to the different reaction time-dependent morphologies. More importantly, the total fluorescence intensity is significantly reinforced by doping Sr2+ ions. When 18% Sr2+ is doped into NaLuF4: Er3+ hexagonal microtubes, the maximum green and red luminescence intensities are about 5.8 and 4.4 times higher than those of Sr2+-free samples, respectively. The influences of Sr2+ ion doping content on the phase, the morphology, and the local crystal field symmetry of the as-synthesized NaLuF4 crystals are investigated.

scholarly journals The Impact of Ligand Field Symmetry on Molecular Qubit Coherence

2021 ◽  
Author(s):  
Nathanael P. Kazmierczak ◽  
Ruben Mirzoyan ◽  
Ryan G. Hadt
Keyword(s):  
Ligand Field ◽  
Field Symmetry ◽  
The Impact

scholarly journals Eu3+, Tb3+- and Er3+, Yb3+-Doped α-MoO3 Nanosheets for Optical Luminescent Thermometry

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 646 ◽  
Author(s):  
Jing Liu ◽  
Rik Van Deun ◽  
Anna M. Kaczmarek
Keyword(s):  
Photoelectron Spectroscopy ◽  
Upconversion Luminescence ◽  
Luminescence Spectroscopy ◽  
Potential Candidate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Applications ◽  
Transmission Electron ◽  
Heat Treated ◽  
Synthesis Approach

Here we report a novel synthesis approach for the preparation of α-MoO3:Ln3+ materials employing a two-step synthesis. Additionally, in this work the α-MoO3:Ln3+ materials are reported as potential optical thermometers for the first time. In this synthesis approach, first MoS2 2D nanosheets were prepared, which were further heat treated to obtain α-MoO3. These materials were fully characterized by powder X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), thermogravimetry (TG) and differential thermal analysis (DTA), transmission electron microscopy (TEM), and luminescence spectroscopy. Temperature-dependent luminescence measurements were carried out to determine the optical thermometric properties of two different types of α-MoO3:Ln3+ materials (Eu3+/Tb3+ downshifting and Er3+/Yb3+ upconversion luminescence systems). We demonstrate in this study that this class of material could be a potential candidate for temperature-sensing applications.

Why Zinc Fingers Prefer Zinc:  Ligand-Field Symmetry and the Hidden Thermodynamics of Metal Ion Selectivity†,‡

Biochemistry ◽  
2004 ◽  
Vol 43 (44) ◽  
pp. 13910-13925 ◽  
Author(s):  
Marcel J. Lachenmann ◽  
John E. Ladbury ◽  
Jian Dong ◽  
Kun Huang ◽  
Paul Carey ◽  
...  
Keyword(s):  
Metal Ion ◽  
Zinc Fingers ◽  
Ion Selectivity ◽  
Ligand Field ◽  
Field Symmetry ◽  
Metal Ion Selectivity

Direct Observation of Crystalline Ordering In Naturally Graphitized Carbon Produced by Low Grade Metamorphism

1977 ◽  
Vol 35 ◽  
pp. 162-163
Author(s):  
Thomas R. McKee ◽  
Peter R. Buseck
Keyword(s):  
Crystallite Size ◽  
Sedimentary Rocks ◽  
Carbonaceous Material ◽  
Low Grade ◽  
X Ray ◽  
Graphitized Carbon ◽  
Transmission Electron ◽  
Heat Treated ◽  
Commercial Carbon ◽  
Metamorphic Zone

Sediments commonly contain organic material which appears as refractory carbonaceous material in metamorphosed sedimentary rocks. Grew and others have shown that relative carbon content, crystallite size, X-ray crystallinity and development of well-ordered graphite crystal structure of the carbonaceous material increases with increasing metamorphic grade. The graphitization process is irreversible and appears to be continous from the amorphous to the completely graphitized stage. The most dramatic chemical and crystallographic changes take place within the chlorite metamorphic zone.The detailed X-ray investigation of crystallite size and crystalline ordering is complex and can best be investigated by other means such as high resolution transmission electron microscopy (HRTEM). The natural graphitization series is similar to that for heat-treated commercial carbon blacks, which have been successfully studied by HRTEM (Ban and others).

Effect of Shock Loading on the Microstructure of Uniloy 326

1974 ◽  
Vol 32 ◽  
pp. 504-505
Author(s):  
K. P. Staudhammer ◽  
L. E. Murr
Keyword(s):  
Grain Size ◽  
Shock Loading ◽  
Current Investigation ◽  
Two Phase ◽  
05 C ◽  
Shock Deformation ◽  
Heat Treated

The effect of shock loading on a variety of steels has been reviewed recently by Leslie. It is generally observed that significant changes in microstructure and microhardness are produced by explosive shock deformation. While the effect of shock loading on austenitic, ferritic, martensitic, and pearlitic structures has been investigated, there have been no systematic studies of the shock-loading of microduplex structures.In the current investigation, the shock-loading response of millrolled and heat-treated Uniloy 326 (thickness 60 mil) having a residual grain size of 1 to 2μ before shock loading was studied. Uniloy 326 is a two phase (microduplex) alloy consisting of 30% austenite (γ) in a ferrite (α) matrix; with the composition.3% Ti, 1% Mn, .6% Si,.05% C, 6% Ni, 26% Cr, balance Fe.

Sign in / Sign up

Export Citation Format

Share Document