Microscintillator of Ce Doped β-NaLuF4 in Uniform Hexagonal Prism Morphology by a Facile Hydrothermal Method

2014 ◽  
Vol 541-542 ◽  
pp. 220-224
Author(s):  
Li Sha Liu ◽  
Hao Hong Chen ◽  
Bi Qiu Liu ◽  
Bin Tang ◽  
Zhi Jia Sun ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Hexagonal Phase ◽  
Broad Band ◽  
High Energy ◽  
Hexagonal Prism ◽  
Facile Hydrothermal Method ◽  
X Ray ◽  
Strong Broad Band ◽  
Broad Band Emission ◽  
Band Emission

To explore micro-or nanoscintillator with a controllable architecture, a novel facile hydrothermal method easy for commercial run was used to synthesize pure and Ce doped β-NaLuF4 microcrystals at 453K. The morphology of uniform hexagonal prism with 3.3μm in diameter and 1.4 μm in thickness, respectively, is presented by the results of scanning electron microscopy (SEM). Powder X-ray diffraction (PXRD) patterns show the products are both pure hexagonal phase. Different from the undoped product without any irradiation, the Ce doped product has given strong broad band emission attributed to 5d4f transition of Ce3+, which can be potentially used as scintillator for biomedical imaging and detectors for high energy such as X-ray and γray. This synthetical strategy extends the understanding about nanomaterial chemistry and can be also useful for other systems such as fluorides, oxides and sulfides.

scholarly journals The challenging SED of AP Librae

2011 ◽  
Vol 7 (S284) ◽  
pp. 411-413 ◽  
Author(s):  
David Sanchez ◽  
Berrie Giebels ◽  
Pascal Fortin ◽  
Keyword(s):  
Spectral Energy Distribution ◽  
Broad Band ◽  
Low Frequency ◽  
Theoretical Models ◽  
Intermediate Frequency ◽  
High Energy ◽  
Spectral Energy ◽  
Broad Band Emission ◽  
Band Emission ◽  
Bl Lac

AbstractMatching the broad-band emission of active galaxies with the predictions of theoretical models can be used to derive constraints on the properties of the emitting region and to probe the physical processes involved. AP Librae is the third low frequency peaked BL Lac (LBL) detected at very high energy (VHE, E>100GeV) by an Atmospheric Cherenkov Telescope; most VHE BL Lacs (34 out of 39) belong to the high-frequency and intermediate-frequency BL Lac classes (HBL and IBL). LBL objects tend to have a higher luminosity with lower peak frequencies than HBLs or IBLs. The characterization of their time-averaged spectral energy distribution is challenging for emission models such as synchrotron self-Compton (SSC) models.

Synthesis, Characterization and Photophysical Properties of Rhenium(I) Complexe with 2-(naphthalen-2-yl)-1-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline

2014 ◽  
Vol 988 ◽  
pp. 66-69
Author(s):  
Qiang Li ◽  
Le Li ◽  
Rong Feng Zhong ◽  
Hai Di Cai ◽  
Feng Zhao
Keyword(s):  
Experimental Data ◽  
Solid State ◽  
Photophysical Properties ◽  
Broad Band ◽  
High Energy ◽  
H Nmr ◽  
Emission Maximum ◽  
Broad Band Emission ◽  
Band Emission

In this paper, a Re(I) complex [Re(CO)3(E2)Cl], where E2 = 2-(naphthalen-2-yl)-1-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline(E2), was synthesized and characterized by 1H NMR successfully. Experimental data confirm that Re(I) complex [Re(CO)3(E2)Cl] is high-energy-emitting one. The broad band emission upon excitation at λ = 400 nm with the emission maximum locates at λ = 581 nm in solid state and 614nm in CH2Cl2 solution were observed.

scholarly journals Multiwavelength observations of PSR J2032+4127 during the 2017 periastron passage

2020 ◽  
Vol 495 (1) ◽  
pp. 365-374 ◽  
Author(s):  
M Chernyakova ◽  
D Malyshev ◽  
P Blay ◽  
B van Soelen ◽  
S Tsygankov
Keyword(s):  
Gamma Ray ◽  
Broad Band ◽  
Joint Analysis ◽  
Spectral Evolution ◽  
Optical Telescope ◽  
X Ray ◽  
Broad Band Emission ◽  
Band Emission ◽  
Mass Outflow ◽  
Be Star

ABSTRACT PSR J2032+4127 is only the second known gamma-ray binary where it is confirmed that a young radio pulsar is in orbit around a Be-star. The interaction of the pulsar wind with the mass outflow from the companion leads to broad-band emission from radio up to TeV energies. In this paper we present results of optical monitoring of the 2017 periastron passage with the Nordic Optical Telescope. These observations are complemented by X-ray (Swift/XRT, NuSTAR) and GeV (Fermi/LAT) monitoring. Joint analysis of the evolution of the parameters of the H α line and the broad-band (X-ray to TeV) spectral shape allows us to propose a model linking the observed emission to the interaction of the pulsar and Be-star winds under the assumption of the inclined disc geometry. Our model allows the observed flux and spectral evolution of the system to be explained in a self-consistent way.

scholarly journals Late X-ray flares from the interaction of a reverse shock with a stratified ejecta in GRB afterglows: simulations on a moving mesh

2020 ◽  
Vol 495 (3) ◽  
pp. 2979-2993 ◽  
Author(s):  
Eliot H Ayache ◽  
Hendrik J van Eerten ◽  
Frédéric Daigne
Keyword(s):  
Gamma Ray ◽  
Mass Density ◽  
Broad Band ◽  
Moving Mesh ◽  
Late Time ◽  
Causal Connection ◽  
Reverse Shock ◽  
X Ray ◽  
Broad Band Emission ◽  
Band Emission

ABSTRACT Late activity of the central engine is often invoked in order to explain the flares observed in the early X-ray afterglow of gamma-ray bursts, either in the form of an active neutron star remnant or (fall-back) accretion on to a black hole. However, these scenarios are not always plausible, in particular when flares are delayed to very late times after the burst. Recently, a new scenario was proposed that suggests X-ray flares can be the result of the passing of a long-lived reverse shock through a stratified ejecta, with the advantage that it does not require late-time engine activity. In this work, we numerically demonstrate this scenario to be physically plausible, by performing one-dimensional simulations of ejecta dynamics and emission using our novel moving-mesh relativistic hydrodynamics code. Improved efficiency and precision over previous work enables the exploration of a broader range of set-ups. We can introduce a more physically realistic description of the circumburst medium mass density. We can also locally trace the cooling of electrons when computing the broad-band emission from these set-ups. We show that the synchrotron cooling time-scale can dominate the flare decay time if the stratification in the ejecta is constrained to a localized angular region inside the jet, with size corresponding to the relativistic causal connection angle, and that it corresponds to values reported in observations. We demonstrate that this scenario can produce a large range of observed flare times, suggesting a connection between flares and initial ejection dynamics rather than with late-time remnant activity.

scholarly journals Warm ionized ISM in the bulge of Andromeda galaxy

2009 ◽  
Vol 5 (H15) ◽  
pp. 296-296
Author(s):  
Marat Gilfanov ◽  
Akos Bogdan
Keyword(s):  
Galactic Disk ◽  
Broad Band ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Spiral Arms ◽  
X Ray ◽  
Star Forming ◽  
Star Forming Regions ◽  
Broad Band Emission ◽  
Band Emission

AbstractWe demonstrate that unresolved X-ray emission from the bulge of M31 is composed of at least three different components: (i) Broad-band emission from a large number of faint sources – mainly accreting white dwarfs and active binaries, associated with the old stellar population, similar to the Galactic Ridge X-ray emission of the Milky Way. (ii) Soft emission from ionized gas with temperature of about ~ 300 eV and mass of ~ 4 × 106 M⊙. The gas distribution is significantly elongated along the minor axis of the galaxy suggesting that it may be outflowing in the direction perpendicular to the galactic disk. The shadows cast on the gas by spiral arms and the 10-kpc star-forming ring confirm large off-plane extent of the gas. (iii) Hard unresolved emission from spiral arms, most likely associated with protostars and young stellar objects located in the star-forming regions.

Simplified Synthesis and Luminous Mechanism of Eu2+-Doped α-Si3N4 Nanowires with Strong Green Luminescent Properties

2017 ◽  
Vol 727 ◽  
pp. 635-641 ◽  
Author(s):  
Rui Su ◽  
Zhi Feng Huang ◽  
Fei Chen ◽  
Qiang Shen ◽  
Lian Meng Zhang
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Broad Band ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Broad Band Emission ◽  
Band Emission ◽  
Nitridation Process ◽  
Transmission Electron

Ultra-long, single crystal, Eu-doped α-Si3N4 nanowires were prepared by a simple approach involving nitriding Eu-doped cryomilled nanocrystalline Si powder in NH3 flow at 1350 °C for 4 h. Phases, chemical composition and microcosmic feature of cryomilled powders and as-prepared nanowires were tested by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), respectively. The results suggested that Eu was successfully introduced into Si lattice after the cryomilling process and then entered into the lattice of α-Si3N4 during the nitridation process. The as-synthesized Eu-doped α-Si3N4 nanowires had highly uniform dimension with 20~30 nm in diameter and ~100 μm in length. The room temperature photoluminescence (PL) spectrum of as-synthesized nanowires showed a broad band emission center at 570 nm which was attributed to the transition from 4f65d to 4f7 in Eu2+. The transition from Eu3+ to Eu2+ during nitridation process was tested by X-ray photoelectron spectroscopy (XPS).

scholarly journals One-dimensional lead iodide hybrid stabilized by inorganic hexarhenium cluster cations as a new broad-band emitter

RSC Advances ◽  
2021 ◽  
Vol 11 (40) ◽  
pp. 24580-24587
Author(s):  
Giang Thi Ly ◽  
Jun Choi ◽  
Youngmee Kim ◽  
Yuna Kim ◽  
Sujin Kim ◽  
...  
Keyword(s):  
Broad Band ◽  
Lead Iodide ◽  
One Dimensional ◽  
Strong Broad Band ◽  
Broad Band Emission ◽  
Band Emission

A novel one-dimensional (1D) hybrid {[Re6S8(Pz)6][Pb3I8(DMF)2]}·6(DMF) with hexarhenium cluster cations has been synthesized, and it shows strong broad-band emission with peak at 634 nm.

Synthesis, Characterization and Photophysical Properties of a New CuI Complexe Contain Bis[2-(diphenylphosphino)phenyl]ether and 2-(anthracen-9-yl)-1-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline

2014 ◽  
Vol 1033-1034 ◽  
pp. 1163-1166
Author(s):  
Ji Ling He
Keyword(s):  
Experimental Data ◽  
Photophysical Properties ◽  
Broad Band ◽  
High Energy ◽  
Phenyl Ether ◽  
H Nmr ◽  
Emission Maximum ◽  
Broad Band Emission ◽  
Band Emission ◽  
Diimine Ligand

In this paper, a new diimine ligand of 2-(anthracen-9-yl)-1-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline(D1) and its corresponding CuI complex contain Bis[2-(diphenylphosphino)phenyl]ether were synthesized and characterized by 1H NMR successfully. Experimental data confirm that Complex [Cu(D1)(DPEphos)](PF6) is high-energy-emitting one. The broad band emission upon excitation at λ = 400 nm with the emission maximum locates at λ = 579 nm was observed. This makes them potential candidates as cheap emitting materials.

Synthesis, Characterization and Photophysical Properties of a New CuI Complexe Contain Bis[2-(diphenylphosphino)phenyl] ether and 7,10-Dimethyl Pyrazino [2,3-f][1,10]phenanthroline

2014 ◽  
Vol 941-944 ◽  
pp. 610-613
Author(s):  
Qiang Li ◽  
Zhenh Xiong ◽  
Rongf Zhong ◽  
Feng Zhao
Keyword(s):  
Experimental Data ◽  
1H Nmr ◽  
Photophysical Properties ◽  
Broad Band ◽  
High Energy ◽  
Red Shift ◽  
Phenyl Ether ◽  
Emission Maximum ◽  
Broad Band Emission ◽  
Band Emission

In this paper, a new CuI complex containing the bis[2-(diphenylphosphino)phenyl]ether and 7,10-Dimethyl Pyrazino [2,3-f][1,10]phenanthroline have been syntheized and characterized by 1H NMR successfully. Experimental data confirm that Complex [Cu(dppl)(DPEphos)](PF6) is high-energy-emitting one. The broad band emission upon excitation at λ = 420 nm with the emission maximum locates at λ = 577 nm was observed. The introduction of DPEphos system leads to red shift of emissive about 11 nm than complex [Cu(dppl)2](PF6). This makes them potential candidates as cheap emitting materials.

Synthesis, Characterization and Photophysical Properties of CuI Complexe with 7,10-Dimethyl Pyrazino [2,3-f][1,10]phenanthroline

2014 ◽  
Vol 881-883 ◽  
pp. 201-204
Author(s):  
Qiang Li ◽  
Wen Qu Liu ◽  
Feng Zhao
Keyword(s):  
Experimental Data ◽  
1H Nmr ◽  
Photophysical Properties ◽  
Broad Band ◽  
High Energy ◽  
Cu Complex ◽  
Emission Maximum ◽  
Broad Band Emission ◽  
Band Emission ◽  
Cu Complexes

In this paper, a diimine compound of 7,10-DimethylPyrazino[2,3-f][1,10]phenanthroline (dppl) and its corresponding phosphorescent Cu complexes were synthesized and characterized by 1H NMR successfully. Experimental data confirm that Cu Complex is high-energy-emitting one. The broad band emission upon excitation at λ = 440 nm with the emission maximum locates at λ = 566 nm was observed. This makes them potential candidates as cheap emitting materials.

Sign in / Sign up

Export Citation Format

Share Document