scholarly journals Unusual x-ray excited luminescence spectra of NiO suggest self-trapping of thed-dcharge-transfer exciton

2012 ◽  
Vol 86 (11) ◽  
Author(s):  
V. I. Sokolov ◽  
V. A. Pustovarov ◽  
V. N. Churmanov ◽  
V. Yu. Ivanov ◽  
N. B. Gruzdev ◽  
...  
Keyword(s):  
Luminescence Spectra ◽  
X Ray ◽  
Self Trapping ◽  
Excited Luminescence

Self-trapping of the d-d charge transfer exciton in bulk NiO evidenced by X-ray excited luminescence

JETP Letters ◽  
2012 ◽  
Vol 95 (10) ◽  
pp. 528-533 ◽  
Author(s):  
V. I. Sokolov ◽  
V. A. Pustovarov ◽  
V. N. Churmanov ◽  
V. Yu. Ivanov ◽  
N. B. Gruzdev ◽  
...  
Keyword(s):  
Charge Transfer ◽  
X Ray ◽  
Self Trapping ◽  
Excited Luminescence

Luminescence properties of Na3LuSi3O9:Ce3+ as a potential scintillator material

RSC Advances ◽  
2015 ◽  
Vol 5 (124) ◽  
pp. 102477-102480 ◽  
Author(s):  
Jianbang Zhou ◽  
Fengjuan Pan ◽  
Jiuping Zhong ◽  
Hongbin Liang ◽  
Qiang Su ◽  
...  
Keyword(s):  
Luminescence Properties ◽  
Luminescence Spectra ◽  
X Ray ◽  
Scintillator Material ◽  
Excited Luminescence

Comparison between the X-ray excited luminescence spectra of the Bi4Ge3O12 (BGO) and Na3Lu0.99Ce0.01Si3O9 powders.

Activation of Lead Fluoride Room Temperature Luminescence by Structural Modifications

1994 ◽  
Vol 348 ◽  
Author(s):  
D.L. Alov ◽  
A.V. Bazhenov ◽  
V.K. Egorov ◽  
G.A. Emelchenko ◽  
N.V. Klassen ◽  
...  
Keyword(s):  
Room Temperature ◽  
Structural Characteristics ◽  
Structural Defects ◽  
Luminescence Spectra ◽  
Lead Fluoride ◽  
Light Emitting ◽  
X Ray ◽  
Structural Modifications ◽  
Excited Luminescence ◽  
Room Temperature Luminescence

ABSTRACTThe connection of lead fluoride luminescence properties with its structural characteristics has been studied. Single crystals of the cubic and orthorombic phases, cubic and orthorombic powders, pressure compacted orthorombic ceramics, plastically deformed crystals were used. The photo- and X-ray excited luminescence spectra have been investigated. The experimental results have shown that the room temperature luminescence of lead fluoride can be accounted for local light emitting centers which are produced by the intrinsic structural defects in the orthorombic lead fluoride.

scholarly journals X-Ray Excited Luminescence Spectroscopy and Imaging with NaGdF4:Eu and Tb

2020 ◽  
Author(s):  
Meenakshi Ranasinghe ◽  
Md Arifuzzaman ◽  
Apeksha C. Rajamanthrilage ◽  
Ashley Dickey ◽  
Joseph W. Kolis ◽  
...  
Keyword(s):  
High Temperature ◽  
Mri Contrast Agents ◽  
Luminescence Spectroscopy ◽  
Luminescence Spectra ◽  
Mri Contrast ◽  
X Ray ◽  
Optical Luminescence ◽  
Light Generation ◽  
Excited Luminescence ◽  
Hydrothermal Methods

<p>X-ray scintillating NaGdF<sub>4</sub>: Eu and Tb nanophosphors were synthesized via co-precipitate and hydrothermal methods, encapsulated with silica, functionalized with biotin, and characterized by X-ray excited optical luminescence spectroscopy and imaging. The nanophosphors synthesized by co-precipitate method were ~90 and ~106 nm in size, respectively; nanophosphors synthesized by hydrothermal method showed the highest luminescence intensity. Further, we investigated the effect of thermal annealing/calcination on the X-ray excited luminescence spectra and intensity. We observed, at high-temperature, NaGdF<sub>4</sub>: Eu@SiO<sub>2</sub> converts to NaGd<sub>9</sub>Si<sub>6</sub>O<sub>26</sub>: Eu which is also an X-ray scintillator. The particles generate light through tissue and can be selectively excited using a focused X-ray source for imaging and light generation applications. The particles also act as MRI contrast agents for multi-modal localization. </p>

scholarly journals X-Ray Excited Luminescence Spectroscopy and Imaging with NaGdF4:Eu and Tb

2020 ◽  
Author(s):  
Meenakshi Ranasinghe ◽  
Md Arifuzzaman ◽  
Apeksha C. Rajamanthrilage ◽  
Ashley Dickey ◽  
Joseph W. Kolis ◽  
...  
Keyword(s):  
High Temperature ◽  
Mri Contrast Agents ◽  
Luminescence Spectroscopy ◽  
Luminescence Spectra ◽  
Mri Contrast ◽  
X Ray ◽  
Optical Luminescence ◽  
Light Generation ◽  
Excited Luminescence ◽  
Hydrothermal Methods

<p>X-ray scintillating NaGdF<sub>4</sub>: Eu and Tb nanophosphors were synthesized via co-precipitate and hydrothermal methods, encapsulated with silica, functionalized with biotin, and characterized by X-ray excited optical luminescence spectroscopy and imaging. The nanophosphors synthesized by co-precipitate method were ~90 and ~106 nm in size, respectively; nanophosphors synthesized by hydrothermal method showed the highest luminescence intensity. Further, we investigated the effect of thermal annealing/calcination on the X-ray excited luminescence spectra and intensity. We observed, at high-temperature, NaGdF<sub>4</sub>: Eu@SiO<sub>2</sub> converts to NaGd<sub>9</sub>Si<sub>6</sub>O<sub>26</sub>: Eu which is also an X-ray scintillator. The particles generate light through tissue and can be selectively excited using a focused X-ray source for imaging and light generation applications. The particles also act as MRI contrast agents for multi-modal localization. </p>

Self-trapping of the d-d charge transfer exciton in rock-salt structured Zn1-x Ni x O evidenced by soft X-ray excited luminescence

2013 ◽  
Vol 10 (10) ◽  
pp. 1329-1335
Author(s):  
V. I. Sokolov ◽  
V. A. Pustovarov ◽  
V. N. Churmanov ◽  
V. Yu. Ivanov ◽  
N. B. Gruzdev ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Rock Salt ◽  
X Ray ◽  
Self Trapping ◽  
Excited Luminescence

Tuning the Photophysical Properties of Cyclometalated Ir(III) Complexes by a Trifluoroacetyl Group

2012 ◽  
Vol 67 (3) ◽  
pp. 213-218 ◽  
Author(s):  
Bihai Tong ◽  
Jiayan Qiang ◽  
Qunbo Mei ◽  
Hengshan Wang ◽  
Qianfeng Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Electron Acceptor ◽  
Photophysical Properties ◽  
Red Shift ◽  
Luminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Absorption And Luminescence Spectra ◽  
Homo Lumo

Four cationic Ir(III) complexes, [Ir(dpq)2(bpy)]PF6 (1), [Ir(dpq)2(phen)]PF6 (2), [Ir(tfapq)2- (bpy)]PF6 (3), and [Ir(tfapq)2(phen)]PF6 (4) (dpqH = 2,4-diphenylquinoline, tfapqH = 2-(4ʹ-trifluoroacetylphenyl)- 4-phenylquinoline, bpy = 2,2ʹ-bipyridine, phen = 1,10-phenanthroline) have been synthesized and fully characterized. The structure of 4 was also confirmed by single-crystal X-ray diffraction. The electron-acceptor character of the trifluoroacetyl unit leads to a reduced HOMO-LUMO gap and consequently a red-shift of the UV/Vis absorption and luminescence spectra. The solvophobic character of the trifluoroacetyl unit gives rise to a molecule assembly in solution.

ELECTRON STRUCTURE INVESTIGATIONS OF InGaP/GaAs(100) HETEROSTRUCTURES WITH InP QUANTUM DOTS

2007 ◽  
Vol 06 (03n04) ◽  
pp. 215-219
Author(s):  
E. P. DOMASHEVSKAYA ◽  
V. A. TEREKHOV ◽  
V. M. KASHKAROV ◽  
S. YU. TURISHCHEV ◽  
S. L. MOLODTSOV ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Emission Spectra ◽  
Luminescence Spectra ◽  
Partial Density ◽  
Edge Structure ◽  
X Ray ◽  
Metal Organic ◽  
Structure Investigations ◽  
First Time ◽  
Inp Quantum Dots

Ultrasoft X-ray emission spectra (USXES) and X-ray absorption near-edge structure (XANES) spectra with the use of synchrotron radiation in the range of P L2,3-edges were obtained for the first time for nanostructures with InP quantum dots grown on GaAs 〈100〉 substrates by vapor-phase epitaxy from metal–organic compounds. These spectra represent local partial density of states in the valence and conduction bands. The additional XANES peak is detected; its intensity depends on the number of monolayers forming quantum dots. Assumptions are made on the band-to-band origin of luminescence spectra in the studied nanostructures.

Temperature behavior of X-Ray luminescence spectra of ZnSe

2022 ◽  
Author(s):  
I. Abbasov ◽  
M. Musayev ◽  
D. Askerov ◽  
J. Huseynov ◽  
E. Gavrishuk ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Chemical Vapor ◽  
Temperature Behavior ◽  
Luminescence Spectra ◽  
Uv Laser ◽  
Green Band ◽  
Spectra Analysis ◽  
X Ray ◽  
Temperature Dependences ◽  
The Given

In the given paper, the temperature dependences ([Formula: see text]–300 K) of the green band intensity at wavelengths [Formula: see text] nm and [Formula: see text] nm have been measured and observed, respectively, from the polished and unpolished surface (PS and unPS) of a polycrystalline CVD (chemical vapor deposition) ZnSe sample upon excitation by X-ray quanta ([Formula: see text]. In both cases, the activation energy of thermal quenching has been determined, and the reasons for thermal quenching have been considered in detail. Along with XRL spectra analysis, the temperature behavior of the green band observed upon excitation by an ultraviolet (UV) laser (He–Cd, [Formula: see text] nm) from the PS and unPS in the temperature range [Formula: see text]–200 K has been discussed in more detail.

scholarly journals Люминесценция кристаллов BaBrI, активированных ионами Ce-=SUP=-3+-=/SUP=-

2019 ◽  
Vol 61 (5) ◽  
pp. 930
Author(s):  
Р.Ю. Шендрик ◽  
И.И. Ковалев ◽  
А.И. Русаков ◽  
Ю.В. Сокольникова ◽  
А.А. Шалаев
Keyword(s):  
Luminescence Spectra ◽  
Russian Science ◽  
Scientific Center ◽  
X Ray ◽  
Trivalent Lanthanides ◽  
Scientific Equipment ◽  
The Government ◽  
Geochemical Studies ◽  
Transfer Mechanisms

The optical properties of BaBrI crystals doped with cerium ions were studied. The possible types of cerium-containing luminescence centers are established. Based on the experimental data obtained for trivalent lanthanides, a Dorenbos diagram was constructed. According to the results of the study of the luminescence spectra measured under X-ray excitation, possible energy transfer mechanisms are assumed. This work was supported by the Russian Science Foundation, a grant of the Russian Science Foundation 17-72-10084: spectroscopy of cerium and cerium-oxygen centers, determination of cerium concentration in crystals, analysis of the results obtained. Some of the crystals investigated in the article were grown as part of the government assignment 0350-2016-0024. The data in the work were obtained using the scientific equipment of the Collective Scientific Center "Isotope-geochemical studies" of the IHP SB RAS.

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