Time-Resolved Spectroscopy of Scintillation Materials using X-RAY Synchrotron Radiation

1994 ◽  
Vol 348 ◽  
Author(s):  
Andrey N. Belsky ◽  
Vitaly V. Mikhaihin ◽  
Andrey L. Rogalev ◽  
Eduard I. Zinin
Keyword(s):  
Synchrotron Radiation ◽  
Spectral Composition ◽  
Emission Spectra ◽  
Luminescence Spectra ◽  
Electronic Excitations ◽  
Decay Kinetics ◽  
Time Resolved ◽  
X Ray ◽  
Exponential Law ◽  
Kinetics Of

ABSTRACTThe time-resolved luminescence spectra and decay kinetics of BaF2, BGO, and CeF3, were measured with the dissector technique using X-ray synchrotron radiation (SR)of different spectral composition from wiggler mounted at VEPP-3 storage ring (Novosibirsk).Two effects of X-ray excitation energy on the luminescence parameters were observed: modifications of the emission spectrum and acceleration of decay kinetics. Under the excitation by soft X-ray SR the 220 nm emission band for BaF2 is broadened, whereas shorter wavelength part of CeF3 and BGO emission spectra increases. For luminescence decay of excitons and crossluminescence the degree of the deviation from the single exponential law depends on the photon energies and increases under soft X-ray excitation as well. These effects are supposed to be due to the interaction of electronic excitations created after the relaxation of deep core holes.Fast intrinsic luminescence was observed for Cdl2, and CsPbCl3 under X-ray SR excitation. 500 nm band of Cdl2 has characteristic time τ=4.6 ns, whereas 420 nm band of CsPbCl3 shows very fast decay with τ=0.2 ns.

scholarly journals Люминесценция примесных Pr-=SUP=-3+-=/SUP=--центров и дефектов в Sr-=SUB=-9-=/SUB=-Sc(PO-=SUB=-4-=/SUB=-)-=SUB=-7-=/SUB=-:Pr-=SUP=-3+-=/SUP=-

2019 ◽  
Vol 61 (5) ◽  
pp. 867
Author(s):  
В.А. Пустоваров ◽  
К.В. Ивановских ◽  
Ю.Е. Хатченко ◽  
В.Ю. Иванов ◽  
M. Bettinelli ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Vacuum Ultraviolet ◽  
Slow Component ◽  
Visible Spectrum ◽  
Luminescence Spectra ◽  
Decay Kinetics ◽  
X Ray ◽  
Spectroscopic Characteristics ◽  
Main Component ◽  
Kinetics Of

AbstractThe spectroscopic characteristics and luminescence decay kinetics of Sr_9Sc(PO_4)_7:Pr^3+(1%) were investigated using synchrotron radiation of ultraviolet (UV), vacuum ultraviolet (VUV) and X-ray ranges, as well as pulsed cathodoluminescence (PCL) methods at temperatures of 10, 90, and 295 K. The luminescence spectra contain three groups of bands and lines. In the UV range, the observed bands correspond to interconfigurational 5 d → 4 f transitions in Pr^3+ ions. In the visible spectrum, the wide luminescence band of defects dominates, as well as narrow lines associated with intraconfigurational 4 f → 4 f transitions in Pr^3+ ions. When excited by an electron beam (5 Hz), the main component with a decay time τ ∼ 17 ns dominates in the decay kinetics of the 5 d → 4 f luminescence. The decay kinetics of 5 d → 4 f luminescence upon excitation with high-frequency (τ ∼ 8 MHz) synchrotron radiation of the X-ray range contains a fast component (τ ∼ 15 ns) against the background of the slow component of the μs-range. An effective nonradiative energy transfer is observed from impurity centers to defects, as well as from the host to Pr^3+ ions and defects.

scholarly journals Спектроскопия и кинетика люминесценции ионов Pr-=SUP=-3+-=/SUP=- в K-=SUB=-3-=/SUB=-LuSi-=SUB=-2-=/SUB=-O-=SUB=-7-=/SUB=- : Pr-=SUP=-3+-=/SUP=-

2019 ◽  
Vol 61 (5) ◽  
pp. 861
Author(s):  
В.А. Пустоваров ◽  
К.В. Ивановских ◽  
Ю.Е. Хатченко ◽  
M. Bettinelli ◽  
Q. Shi
Keyword(s):  
Synchrotron Radiation ◽  
Vacuum Ultraviolet ◽  
Slow Component ◽  
Impurity Center ◽  
Pulse Electron Beam ◽  
Luminescence Spectra ◽  
Decay Kinetics ◽  
Excitation Spectra ◽  
Decay Component ◽  
Kinetics Of

Abstract—The luminescent characteristics of K_3LuSi_2O_7:Pr^3+ (1%), which is a promising optical material for the use as a scintillator, have been studied using a set of techniques. The luminescence spectra of K_3LuSi_2O_7:Pr^3+ (1%) contain two bands in the UV-range with peaks at 284 and 330 nm, which correspond intraconfigurational 5 d → 4 f transitions in the Pr^3+ ions. The radiation in the visible and near IR range (480–850 nm) has been represented by the intraconfigurational 4 f → 4 f transitions. The kinetics of 5 d → 4 f -luminescence contains a build-up stage (τ_rise ∼ 7–12 ns), nonexponential decay stage (τ_1/2 ∼ 60 ns), and a slow component of the μs-range when excited by high-frequency (∼8 MHz) synchrotron radiation of the X-ray range. The fast component of the decay (τ = 54 ns) dominates in the decay kinetics of luminescence along with the build-up stage while the contribution of the μs decay component is less than 0.5% at the excitation by an pulse electron beam (5Hz). The excitation spectra of d – f - and f–f -photoluminescence in the ultraviolet and vacuum ultraviolet range that are measured using synchrotron radiation reveal features that are caused by both intracenter transitions and processes related to the energy transfer from the intrinsic electronic excitations to the impurity center.

scholarly journals Synchrotron Radiation Study of Interconfigurational 5d-4f Luminescence of Pr3+ in KLuP2O7

2014 ◽  
Vol 69 (2) ◽  
pp. 205-209 ◽  
Author(s):  
Mattia Trevisani ◽  
Konstantin Ivanovskikh ◽  
Fabio Piccinelli ◽  
Marco Bettinelli
Keyword(s):  
Excited State ◽  
Synchrotron Radiation ◽  
Luminescence Spectroscopy ◽  
X Ray Diffraction ◽  
Decay Kinetics ◽  
X Ray ◽  
Double Phosphate ◽  
Radiation Study ◽  
Scintillator Material ◽  
Kinetics Of

The double phosphate KLuP2O7 doped with Pr3+ ions was prepared by solid-state reaction. The material obtained was characterized by powder X-ray diffraction. The luminescence spectroscopy and the excited state dynamics of this material were studied upon excitation with VUV synchrotron radiation. The 5d-4 f emission of Pr3+ upon both direct and band gap excitation was detected and assigned. The decay kinetics of the Pr3+ 5d-4 f emission is characterized by a decay time of about 20 ns and is nearly temperature independent within the range 8 - 300 K. Both dynamics and energy transfer peculiarities revealed in the study suggested good potentials for application of KLuP2O7:Pr3+ as a fast scintillator material.

UV and Visible Luminescence of Pr3+ Doped Oxides: New Materials

2008 ◽  
Vol 1111 ◽  
Author(s):  
Fabio Piccinelli ◽  
Adolfo Speghini ◽  
Konstantin Ivanovskikh ◽  
Andries Meijerink ◽  
Cees Ronda ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Significant Rise ◽  
Luminescence Spectroscopy ◽  
New Materials ◽  
Decay Kinetics ◽  
X Ray ◽  
Visible Luminescence ◽  
Decay Times ◽  
Kinetics Of ◽  
Defect Luminescence

AbstractThe garnet Ca3Sc2Si3O12 (CSSO) and the silico-carnotite Ca3Y2Si3O12 (CYSO) and Ca3Lu2Si3O12 (CLSO) materials, both undoped and doped with Pr3+, have been synthesized by solid state reaction at high temperature. The luminescence spectroscopy and the excited state dynamics of the materials have been studied upon VUV and X-ray excitation using synchrotron radiation. All doped samples have shown efficient 5d-4f emission upon direct VUV excitation of 5d levels, but only CSSO:Pr3+ shows luminescence upon interband VUV or X-ray excitation. The VUV excited emission spectra of CYSO:Pr3+ and CLSO:Pr3+ show features attributed to emission from two distinct sites accommodating the Pr3+ dopant. The decay kinetics of the Pr3+ 5d-4f emission in CSSO:Pr3+ upon VUV excitation across the conduction band are characterized by decay times in the range 25-28 ns with no significant rise after the excitation pulse. They appear to be faster upon X-ray irradiation than for VUV excitation. Weak afterglow components are attributed to defect luminescence.

In situ Time-Resolved Small-Angle X-ray Scattering Reveals the Formation Kinetics of Polyelectrolyte Complex Micelles

2019 ◽  
Author(s):  
Hao Wu ◽  
Jeffrey Ting ◽  
Siqi Meng ◽  
Matthew Tirrell
Keyword(s):  
Small Angle ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Polyelectrolyte Complex ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Ray Scattering

We have directly observed the <i>in situ</i> self-assembly kinetics of polyelectrolyte complex (PEC) micelles by synchrotron time-resolved small-angle X-ray scattering, equipped with a stopped-flow device that provides millisecond temporal resolution. This work has elucidated one general kinetic pathway for the process of PEC micelle formation, which provides useful physical insights for increasing our fundamental understanding of complexation and self-assembly dynamics driven by electrostatic interactions that occur on ultrafast timescales.

scholarly journals X-ray reflectivity with a twist: Quantitative time-resolved X-ray reflectivity using monochromatic synchrotron radiation

2019 ◽  
Vol 114 (8) ◽  
pp. 081904 ◽  
Author(s):  
Howie Joress ◽  
Shane Q. Arlington ◽  
Timothy P. Weihs ◽  
Joel D. Brock ◽  
Arthur R. Woll
Keyword(s):  
Synchrotron Radiation ◽  
Time Resolved ◽  
X Ray ◽  
Monochromatic Synchrotron

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.

scholarly journals A large-solid-angle X-ray Raman scattering spectrometer at ID20 of the European Synchrotron Radiation Facility

2017 ◽  
Vol 24 (2) ◽  
pp. 521-530 ◽  
Author(s):  
S. Huotari ◽  
Ch. J. Sahle ◽  
Ch. Henriquet ◽  
A. Al-Zein ◽  
K. Martel ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Raman Scattering ◽  
Solid Angle ◽  
European Synchrotron Radiation Facility ◽  
Electronic Excitations ◽  
Raman Scattering Spectroscopy ◽  
X Ray ◽  
Area Detector ◽  
Spectroscopic Tool

An end-station for X-ray Raman scattering spectroscopy at beamline ID20 of the European Synchrotron Radiation Facility is described. This end-station is dedicated to the study of shallow core electronic excitations using non-resonant inelastic X-ray scattering. The spectrometer has 72 spherically bent analyzer crystals arranged in six modular groups of 12 analyzer crystals each for a combined maximum flexibility and large solid angle of detection. Each of the six analyzer modules houses one pixelated area detector allowing for X-ray Raman scattering based imaging and efficient separation of the desired signal from the sample and spurious scattering from the often used complicated sample environments. This new end-station provides an unprecedented instrument for X-ray Raman scattering, which is a spectroscopic tool of great interest for the study of low-energy X-ray absorption spectra in materials under in situ conditions, such as in operando batteries and fuel cells, in situ catalytic reactions, and extreme pressure and temperature conditions.

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