Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO2 and Spectroscopic Properties of ZrO2:Sm3+ Phosphor

2021 ◽  
Author(s):  
H. S. Lokesha ◽  
K. R. Nagabhushana ◽  
Fouran Singh ◽  
S. H. Tatumi ◽  
A. R. E. Prinsloo ◽  
...  
Keyword(s):  
Charge State ◽  
Oxygen Vacancies ◽  
Spectroscopic Properties ◽  
Monoclinic Zro2

scholarly journals Unraveling the Charge State of Oxygen Vacancies in ZrO2–x on the Basis of Synergistic Computational and Experimental Evidence

2019 ◽  
Vol 123 (18) ◽  
pp. 11581-11590 ◽  
Author(s):  
Claudio Imparato ◽  
Marzia Fantauzzi ◽  
Cristiana Passiu ◽  
Ilaria Rea ◽  
Chiara Ricca ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Charge State ◽  
Oxygen Vacancies

scholarly journals Оптические свойства кристаллов (ZrO-=SUB=-2-=/SUB=-)-=SUB=-1-x-=/SUB=-(Y-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-)-=SUB=-x-=/SUB=- (x=0-0.037), полученных направленной кристаллизацией расплава

2020 ◽  
Vol 128 (12) ◽  
pp. 1830
Author(s):  
Т.В. Перевалов ◽  
В.Н. Кручинин ◽  
С.В. Рыхлицкий ◽  
В.А. Гриценко ◽  
А.П. Елисеев ◽  
...  
Keyword(s):  
Zirconium Oxide ◽  
Oxygen Vacancies ◽  
Maximum Energy ◽  
Photoluminescence Spectra ◽  
High Concentration ◽  
Green Luminescence ◽  
Monoclinic Zro2 ◽  
Tetragonal Modification ◽  
Properties Of Materials ◽  
Optical Properties Of Materials

The luminescent and optical properties of materials based on zirconium oxide obtained by the crystallization of ZrO2 with 0, 2.0, 2.5, 2.8, and 3.7% mol Y2O3 melts were studied. Using Raman spectroscopy, it was found that when the Y2O3 content in the mixture is less than 2 % mol. the material is predominantly a monoclinic ZrO2 structure. For such crystal, a blue-green band with the maximum energy of 2.4 eV was observed in the photoluminescence spectra. This fact, together with the peculiarities of the refractive index and absorption dispersion spectra, indicates the presence of a high concentration of oxygen vacancies and polyvacancies in the sample. With a higher content of Y2O3 in the mixture, the tetragonal modification of ZrO2 dominates in the studied materials; the intensity of blue-green luminescence decreases. A comparative analysis of experimental optical spectra with the first-principle calculations for ideal ZrO2 crystals in the cubic, tetragonal and monoclinic phases was performed.

scholarly journals Spectroscopic properties of oxygen vacancies inLaAlO3

2016 ◽  
Vol 93 (13) ◽  
Author(s):  
Oliver A. Dicks ◽  
Alexander L. Shluger ◽  
Peter V. Sushko ◽  
Peter B. Littlewood
Keyword(s):  
Oxygen Vacancies ◽  
Spectroscopic Properties

Electronic Structure and Charge State of Oxygen Vacancies in Perfect ZrO2 Crystals

1990 ◽  
Vol 162 (1) ◽  
pp. 165-171 ◽  
Author(s):  
A. B. Sobolev ◽  
A. N. Varaksin ◽  
O. A. Keda ◽  
A. P. Khaimenov
Keyword(s):  
Electronic Structure ◽  
Charge State ◽  
Oxygen Vacancies

scholarly journals Solid-state optical properties of self-assembling amyloid-like peptides with different charged states at the terminal ends

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Chiara Schiattarella ◽  
Carlo Diaferia ◽  
Enrico Gallo ◽  
Bartolomeo Della Ventura ◽  
Giancarlo Morelli ◽  
...  
Keyword(s):  
Solid State ◽  
Charge State ◽  
Spectroscopic Properties ◽  
The Self ◽  
Quantum Yields ◽  
Visible Range ◽  
Small Peptides ◽  
Self Assembling ◽  
Uv Visible ◽  
Pl Emission

AbstractThe self-assembling of small peptides not only leads to the formation of intriguing nanoarchitectures, but also generates materials with unexpected functional properties. Oligopeptides can form amyloid-like cross-β assemblies that are able to emit intrinsic photoluminescence (PL), over the whole near-UV/visible range, whose origin is still largely debated. As proton transfer between the peptide chain termini within the assembly is one of the invoked interpretations of this phenomenon, we here evaluated the solid state PL properties of a series of self-assembled hexaphenylalanine peptides characterized by a different terminal charge state. Overall, our data indicate that the charge state of these peptides has a marginal role in the PL emission as all systems exhibit very similar multicolour PL associated with a violation of the Kasha’s rule. On the other hand, charged/uncharged ends occasionally produce differences in the quantum yields. The generality of these observations has been proven by extending these analyses to the Aβ16–21 peptide. Collectively, the present findings provide useful information for deciphering the code that links the spectroscopic properties of these assemblies to their structural/electronic features.

Methanol synthesis on ZnO(0001). I. Hydrogen coverage, charge state of oxygen vacancies, and chemical reactivity

2009 ◽  
Vol 130 (18) ◽  
pp. 184706 ◽  
Author(s):  
Janos Kiss ◽  
Alexander Witt ◽  
Bernd Meyer ◽  
Dominik Marx
Keyword(s):  
Charge State ◽  
Methanol Synthesis ◽  
Oxygen Vacancies ◽  
Chemical Reactivity

scholarly journals Solid-State Optical Properties of Self-Assembling Amyloid-Like Peptides with Different Charged States at the Terminal Ends

2021 ◽  
Author(s):  
Chiara Schiattarella ◽  
Carlo Diaferia ◽  
Enrico Gallo ◽  
Bartolomeo Della Ventura ◽  
Giancarlo Morelli ◽  
...  
Keyword(s):  
Solid State ◽  
Charge State ◽  
Spectroscopic Properties ◽  
The Self ◽  
Quantum Yields ◽  
Visible Range ◽  
Small Peptides ◽  
Self Assembling ◽  
Uv Visible ◽  
Pl Emission

Abstract The self-assembling of small peptides not only leads to the formation of intriguing nanoarchitectures, but also generates materials with unexpected functional properties. Oligopeptides can form amyloid-like cross-β assemblies that are able to emit intrinsic photoluminescence (PL), over the whole near-UV/visible range, whose origin is still largely debated. As proton transfer between the peptide chain termini within the assembly is one of the invoked interpretations of this phenomenon, we here evaluated the solid state PL properties of a series of self-assembled hexaphenalanine peptides characterized by a different terminal charge state. Overall, our data indicate that the charge state of these peptides has a marginal role in the PL emission as all systems exhibit very similar multicolour PL associated with a violation of the Kasha’s rule. On the other hand, charged/uncharged ends occasionally produce differences in the quantum yields. The generality of these observations has been proven by extending these analyses to the Aβ16−21 peptide. Collectively, the present findings provide useful information for deciphering the code that links the spectroscopic properties of these assemblies to their structural/electronic features.

scholarly journals Various Aspects of the Spectroscopy of PAHs (Polycyclic Aromatic Hydrocarbons)

2002 ◽  
Vol 12 ◽  
pp. 44-47
Author(s):  
Philippe Bréchignac
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Charge State ◽  
Aromatic Hydrocarbons ◽  
Near Infrared ◽  
Spectroscopic Properties ◽  
Infrared Emission ◽  
Ir Absorption ◽  
Near Ir ◽  
Polycyclic Aromatic ◽  
Infrared Intensities

AbstractThe exploitation of the recent observations (in particular by ISO) of the near infrared emission bands (UIBs) requires a good knowledge of the spectroscopic properties of the main proposed carriers, i.e. the Polycyclic Aromatic Hydrocarbons, which are expected to act as efficient UV/visible to infrared free-flying light converters.The charge state of the interstellar PAHs strongly affects their spectroscopy. The laboratory study of the electronic transitions of PAH cations in the gas phase enables to address important questions, like their possible contribution to the Diffuse Interstellar Bands (visible and near-IR absorption), and the mechanism responsible for electronic to vibrational intramolecular energy conversion.Microcanonical simulations based on hybrid quantum/classical theoretical methods reveal how strongly affected are the infrared intensities by both the charge state and the vibrational temperature.

Sign in / Sign up

Export Citation Format

Share Document