scholarly journals Luminescent and Scintillation Properties of CeAlO3 Crystals and Phase-Separated CeAlO3/CeAl11O18 Metamaterials

Crystals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 296
Author(s):  
Oleg Sidletskiy ◽  
Pavlo Arhipov ◽  
Serhii Tkachenko ◽  
Iaroslav Gerasymov ◽  
Georgy Trushkovsky ◽  
...  
Keyword(s):  
Decay Time ◽  
Growth Process ◽  
Uv Light ◽  
Light Yield ◽  
Luminescence Decay ◽  
Crystalline Film ◽  
Time Value ◽  
Light Excitation ◽  
Single Crystalline Film ◽  
Α Particles

This work is dedicated to the growth process and investigation of luminescent and scintillation properties of CeAlO3 single crystals and CeAlO3/CeAl11O18 metamaterials under e-beam and α-particles excitation. It has been shown that cathodoluminescence and radioluminescence spectra of CeAlO3 crystals contain two bands, peaking at 440 and 500 nm, and caused by the Ce3+ 5d–4f transitions into CeAl11O18 phase, which is present in these crystals as an admixture. Under 270 nm ultraviolet (UV) light excitation, a CeAlO3 crystal possesses complicated non-exponential luminescence decay, with the average decay time of 16 ns. The light yield of CeAlO3 crystals under α-particle excitation is about 16% and 12%, in respect to the standard Bi4Ge3O12 (BGO) crystal and Y3Al5O12:Ce (YAG:Ce) single crystalline film samples, respectively. The CeAlO3 scintillation decay is quite fast, with the decay time value t1/e in the 54–56 ns range.

UV emitting single crystalline film scintillators grown by LPE method: current status and perspective

2011 ◽  
Vol 1341 ◽  
Author(s):  
Yuriy Zorenko ◽  
Vitaliy Gorbenko ◽  
Volodymyr Savchyn ◽  
Taras Voznyak ◽  
Miroslaw Batentschuk ◽  
...  
Keyword(s):  
Decay Time ◽  
Luminescence Decay ◽  
Current Status ◽  
Single Crystalline ◽  
Crystalline Film ◽  
Crystalline Films ◽  
New Type ◽  
Single Crystalline Film ◽  
Spectral Ranges ◽  
Nm Range

ABSTRACTThis work is dedicated to the development of new type of UV phosphors based on single crystalline films (SCF) of aluminum garnet compounds grown by liquid phase epitaxy (LPE). The development of two types of UV emitting SCF scintillators is reported in this work: 1) Pr-doped SCF of Y-Lu-Al garnet having the intensive Pr3+ f-d luminescence in the 300-400 nm spectral ranges with a decay time of about 13-18 ns; 2) SCF of Y-Lu-Al-garnet doped with Sc3+ isoelectronic impurity emitting in the 290-400 nm range due to the formation of the ScY,Lu and ScAl centers with a luminescence decay time in the order of several hundred ns.

Photoluminescence and photocatalytic activity of zinc tungstate powders

Open Physics ◽  
2011 ◽  
Vol 9 (2) ◽  
Author(s):  
Larisa Gigorjeva ◽  
Donats Millers ◽  
Jānis Grabis ◽  
Dzidra Jankoviča
Keyword(s):  
Grain Size ◽  
Photocatalytic Activity ◽  
Decay Time ◽  
Uv Light ◽  
Combustion Method ◽  
Time Correlation ◽  
Luminescence Decay ◽  
Luminescence Spectra ◽  
Luminescence Decay Time ◽  
Decay Kinetics

AbstractZnWO4 powders with grain size in range 20 nm–10 µm have been synthesized by a simple combustion method and subsequent calcinations. The photocatalytic activities of powders were tested by degradation of methylene blue solution under UV light. The luminescence spectra and luminescence decay kinetics were studied and luminescence decay time dependence on average powder-grain size was obtained. The correlation between self-trapped exciton luminescence decay time and photocatalytic activity of ZnWO4 powders was shown. A model explaining the excitonic luminescence decay time correlation with photocatalytic activity was proposed.

scholarly journals Development of Composite Scintillators Based on the LuAG: Pr Single Crystalline Films and LuAG:Sc Single Crystals

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 846
Author(s):  
Vitalii Gorbenko ◽  
Sandra Witkiewicz-Łukaszek ◽  
Tetiana Zorenko ◽  
Yuri Syrotych ◽  
Jiri A. Mares ◽  
...  
Keyword(s):  
Decay Kinetics ◽  
Single Crystalline ◽  
Epitaxial Structure ◽  
Crystalline Film ◽  
Radiation Fluxes ◽  
Simultaneous Registration ◽  
Crystalline Films ◽  
Single Crystalline Film ◽  
Kinetics Of ◽  
Α Particles

The scintillation properties of novel type of composite scintillator based on Lu3Al5O12:Pr (LuAG:Pr) single crystalline film (SCF) and LuAG:Sc substrate grown by the liquid-phase epitaxy method are considered in this work. The registration of α-particles and γ-quanta in such types of composites occurs by means of separation of the scintillation decay kinetics of SCF and crystal parts, respectively. Namely, under excitation by α-particles of 241Am (5.5 MeV) source and γ-quanta of 137Cs (662 keV) source, the large differences in the respective scintillation decay kinetics and decay time values tα and tγ are observed for the LuAG:Pr SCF/LuAG:Sc SC composite scintillator with various film thicknesses. Furthermore, the best tγ/tα ratio above 4.5 is achieved for such types of epitaxial structure with SCF and substrate thicknesses of 17 μm and about 0.5 mm, respectively. The development types of composite scintillators can be successfully applied for simultaneous registration of α-particles and γ-quanta in the mixed radiation fluxes.

Highly efficient green-emitting phosphor Sr4Al14O25:Ce,Tb with low thermal quenching and wide color gamut upon UV-light excitation for backlighting display applications

2020 ◽  
Author(s):  
Haoran Li ◽  
Yujun Liang ◽  
Shiqi Liu ◽  
Weilun Zhang ◽  
Yanying Bi ◽  
...  
Keyword(s):  
Performance Enhancement ◽  
Uv Light ◽  
Thermal Quenching ◽  
High Response ◽  
Color Gamut ◽  
Ultraviolet Excitation ◽  
Highly Efficient ◽  
Near Ultraviolet ◽  
Wide Color Gamut ◽  
Light Excitation

Highly-efficient and stable inorganic phosphors with high response to near-ultraviolet excitation are essential to the performance enhancement of the phosphor converted backlighting devices. Herein, highly-efficient green-emitting phosphors Sr4Al14O25:Ce,Tb (SAO:Ce3+,Tb3+) with...

ROOM TEMPERATURE PHOTOLUMINESCENCE OF POLYCRYSTALLINE SIC PREPARED FROM CARBON-SATURATED SI MELT

2002 ◽  
Vol 16 (06n07) ◽  
pp. 1047-1051
Author(s):  
JIANPING MA ◽  
ZHIMING CHEN ◽  
GANG LU ◽  
MINGBIN YU ◽  
LIANMAO HANG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Uv Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
Composition And Structure ◽  
Light Excitation ◽  
Scanning Electron

Intense photoluminescence (PL) has been observed at room temperature from the polycrystalline SiC samples prepared from carbon-saturated Si melt at a temperature ranging from 1500 to 1650°C. Composition and structure of the samples have been confirmed by means of X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy. PL measurements with 325 nm UV light excitation revealed that the room temperature PL spectrum of the samples consists of 3 luminescent bands, the peak energies of which are 2.38 eV, 2.77 eV and 3.06 eV, respectively. The 2.38 eV band is much stronger than the others. It is suggested that some extrinsic PL mechanisms associated with defect or interface states would be responsible to the intensive PL observed at room temperature.

A new lanthanum oxysulfide-based IR phosphor with a controlled luminescence decay time

2015 ◽  
Vol 51 (5) ◽  
pp. 466-472 ◽  
Author(s):  
O. Ya. Manashirov ◽  
E. M. Zvereva ◽  
A. N. Lobanov
Keyword(s):  
Decay Time ◽  
Luminescence Decay ◽  
Luminescence Decay Time

Status of Cerium Fluoride Performances

1994 ◽  
Vol 348 ◽  
Author(s):  
E. Auffray ◽  
I. Dafinei ◽  
P. Lecoq ◽  
M. Schneegans
Keyword(s):  
Decay Time ◽  
High Energy Physics ◽  
Light Yield ◽  
High Energy ◽  
Radiation Hardness ◽  
Cerium Fluoride ◽  
The World ◽  
Electromagnetic Calorimeters ◽  
Physics Experiments ◽  
Energy Physics

ABSTRACTCerium fluoride offers a reasonable compromise between parameters like the density, the light yield, the scintillation characteristics (particularly the decay time) and the radiation hardness, and is considered today as the best candidate for large electromagnetic calorimeters in future High Energy Physics experiments. Details on the performances of large crystals produced by different manufacturers all over the world and measured by the Crystal Clear collaboration will be shown and the usefulness of a good collaboration between the industry and the users will be highlighted by some examples on the light yield and radiation hardness improvement.

Syntheses, crystal structures and photoluminescence properties of two rare-earth molybdates CsLn(MoO4)2 (Ln=Eu, Tb)

2018 ◽  
Vol 233 (2) ◽  
pp. 73-79 ◽  
Author(s):  
Dan Zhao ◽  
Fa-Xue Ma ◽  
Bao-Zhong Liu ◽  
Yun-Chang Fan ◽  
Xue-Feng Han ◽  
...  
Keyword(s):  
Rare Earth ◽  
Uv Light ◽  
Layer Structure ◽  
Green Emission ◽  
Salt Flux ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Light Excitation ◽  
Rare Earth Molybdates

AbstractSingle crystals of two cesium rare-earth molybdates CsLn(MoO4)2(Ln=Eu, Tb) have been prepared using the high temperature molten salt (flux) method. Single-crystal X-ray diffraction analyses reveal that they crystallize in the orthorhombic space groupPccm(No. 49) and features a 2D layer structure that is composed of [Ln(MoO4)2]∞and [Cs]∞layers. Under near-UV light excitation, emission spectrum of CsEu(MoO4)2consists of several sharp lines due to the characteristic electronic transitions of Eu3+ions, whereas CsTb(MoO4)2exhibits characteristic green emission of Tb3+ions.

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