Time-Resolved Luminescence Spectra of Dosimeter Glasses

1990 ◽  
Vol 29 (Part 1, No. 5) ◽  
pp. 948-949 ◽  
Author(s):  
Tadaki Miyoshi
Keyword(s):  
Luminescence Spectra ◽  
Time Resolved

scholarly journals Luminescence of uranium(VI) after liquid-liquid extraction from HCl by Aliquat® 336 in n-dodecane:1-decanol by time-resolved laser-induced luminescence spectroscopy

2020 ◽  
Vol 108 (7) ◽  
pp. 527-533 ◽  
Author(s):  
Pascal E. Reiller ◽  
Clarisse Mariet
Keyword(s):  
Organic Phase ◽  
Decay Time ◽  
Specific Interaction ◽  
Intensity Variation ◽  
Pitzer Model ◽  
Luminescence Spectroscopy ◽  
Luminescence Spectra ◽  
Time Resolved ◽  
Crystal Field Effect ◽  
Hcl Concentration

AbstractTo investigate the extraction of uranium(VI) in HCl media by Aliquat® 336 in 1:99 (v:v) 1-decanol:n-dodecane mixture, our objective is to identify the complexe(s) in the organic phase by time-resolved laser-induced luminescence spectroscopy (TRLS). The extraction mechanism is supposed to involve the formation of $[U{O_2}Cl_4^{2 - } \cdot {({R_4}{N^ + })_2}]$ in the organic phase. The occurrence of such a species leads to the presence of the ${\rm{U}}{{\rm{O}}_2}{\rm{Cl}}_4^{2 - }$ species in the organic solution, which luminescence shows particular features. The luminescence spectra and decay time evolutions are obtained in the organic phase as a function of HCl concentration in the aqueous phase (0.5–6 M). The extraction of ${\rm{U}}{{\rm{O}}_2}{\rm{Cl}}_4^{2 - }$ is confirmed by the particular spectrum of uranium(VI) in the organic phase, and the typical splitting of the luminescence bands, due to the crystal field effect, is clearly evidenced. The stoichiometry is verified using luminescence intensity variation as a function of the activity of Cl−, and extraction constants are calculated both using the specific interaction theory and Pitzer model. A decomposition of the spectrum of the extracted complex in the organic phase is also proposed. The decay time variation as a function of temperature allows estimating the activation energy of the luminescence process of the extracted complex.

scholarly journals Defect Characterization in ZnGeP2 by Time -Resolved Photoluminescence

1996 ◽  
Vol 450 ◽  
Author(s):  
N. Dietz ◽  
W. Busse ◽  
H. E. Gumlich ◽  
W. Ruderman ◽  
I. Tsveybak ◽  
...  
Keyword(s):  
Energy Range ◽  
Infrared Emission ◽  
Luminescence Spectra ◽  
Broad Emission Band ◽  
Wide Energy Range ◽  
Time Resolved ◽  
Broad Emission ◽  
Donor Acceptor ◽  
Donor States ◽  
Time Resolved Photoluminescence

AbstractSteady state and time-resolved photoluminescence (PL) investigations on ZnGeP2 crystals grown from the vapor phase by high pressure physical vapor transport (HPVT) and from the melt by gradient freezing (GF) are reported. The luminescence spectra reveal a broad infrared emission with peak position at 1.2 eV that exhibits features of classical donor-acceptor recombination. The hyperbolic decay characteristic over a wide energy range, investigated from 1.2 eV up to 1.5eV, suggest that this broad emission band is related to one energetic recombination center. Higher energetic luminescence structures at 1.6eV and 1.7eV were revealed after annealing of ZnGeP2 crystals in vacuum for a longer period of time. The emission decay behavior in this energy range is characterized by two hyperbolic time constants, viewed as the supercomposition of the decay from the broad emission center peaked at 1.2eV and additional donor-acceptor recombination emissions at 1.6eV and 1.7eV, respectively. ZnGeP2 crystals grown under Ge-deficient conditions by HPVT show an additional emission structure at 1.8 eV with sharp emission fine structures at 1.778 eV related to the presence of additional donor states.

Time-Resolved Luminescence Spectra of Rb2MnCl4 Crystals

1992 ◽  
Vol 170 (1) ◽  
pp. K55-K59 ◽  
Author(s):  
T. Tsuboi ◽  
P. Silfsten ◽  
K. Iio
Keyword(s):  
Luminescence Spectra ◽  
Time Resolved

scholarly journals Time- and Temperature-Dependent Luminescence of Manganese Ions in Ceramic Magnesium Aluminum Spinels

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 420
Author(s):  
Nicholas Khaidukov ◽  
Angela Pirri ◽  
Maria Brekhovskikh ◽  
Guido Toci ◽  
Matteo Vannini ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Broad Band ◽  
Solid State Reaction Method ◽  
Luminescence Spectroscopy ◽  
Luminescence Spectra ◽  
Manganese Ions ◽  
Time Resolved ◽  
Synthesis Conditions ◽  
Magnesium Aluminum Spinel

Samples of magnesium aluminum spinel ceramics doped with manganese ions were prepared by a high-temperature solid-state reaction method; their potential as red-emitting phosphors was analyzed using a time-resolved luminescence spectroscopy technique, from room temperature to 10 K. It was found that in the red spectral range, the luminescence spectra of manganese ions in the MgAl2O4 spinel showed a narrow band peaking at 651 nm due to the emission of Mn4+ and a broader emission band in the region of 675 ÷ 720 nm; the ratio of intensities for these bands depends on the synthesis conditions. By applying a special multi-step annealing procedure, the MgAl2O4:Mn4+ phosphor containing only tetravalent manganese ions, Mn4+, was synthesized. Broad-band far-red emission observed from MgAl2O4:Mn and Mg1.25Al1.75O3.75F0.25:Mn phosphors, prepared by a conventional method of a solid-state reaction, was interpreted as coming from Mn3+ ions.

Time-resolved luminescence spectra of Eu $$^{3+}$$ 3 + doped YVO $$_4$$ 4 , Sr $$_2$$ 2 CeO $$_4$$ 4 and Gd $$_2$$ 2 Zr $$_2$$ 2 O $$_7$$ 7 nanopowders

2016 ◽  
Vol 48 (2) ◽  
Author(s):  
Maja S. Rabasovic ◽  
Janez Krizan ◽  
Peter Gregorcic ◽  
Mihailo D. Rabasovic ◽  
Nebojsa Romcevic ◽  
...  
Keyword(s):  
Luminescence Spectra ◽  
Time Resolved

Pico-second time-resolved luminescence spectra of excitonic molecules in CuCl

1976 ◽  
Vol 20 (9) ◽  
pp. 847-850 ◽  
Author(s):  
Masahiro Ojima ◽  
Takashi Kushida ◽  
Yuichi Tanaka ◽  
Shigeo Shionoya
Keyword(s):  
Luminescence Spectra ◽  
Time Resolved

EXCITON DYNAMICS OF ORTHORHOMBIC PHASE PbI2 EMBEDDED IN PbI2-PbBr2 MIXED CRYSTALS

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3845-3848 ◽  
Author(s):  
J. TAKEDA ◽  
T. SAKAMOTO ◽  
T. ARAI ◽  
S. KURITA
Keyword(s):  
Luminescence Band ◽  
Stokes Shift ◽  
Orthorhombic Phase ◽  
Exciton State ◽  
Mixed Crystals ◽  
Luminescence Spectra ◽  
Relaxation Processes ◽  
Time Resolved ◽  
Decay Component ◽  
Reflection Peak

Reflection, time-integrated and time-resolved luminescence spectra have been measured in PbI 2(1-x) Br 2x(x≥0.5) mixed crystals in order to elucidate the excitonic properties and relaxation processes of orthorhombic phase PbI 2 embedded in the mixed crystals. The crystal structure of PbI 2(1-x) Br 2x above x=0.5 is orthorhombic and an observed new reflection peak (~2.5 × 104 cm -1) above x=0.5 is due to an excitonic state of orthorhombic phase PbI 2. On the excitation energy above 2.5 × 104 cm -1, a broad luminescence band with a large Stokes shift from the reflection peak was observed. This luminescence band is attributed to a self-trapped exciton state. The decay of the luminescence has two components. Based on an atomic excitation picture, the shorter decay component (≤10 ns ) is attributed to the allowed transition from 3P1 to 1S0. On the other hand, the longer decay component (~3 μ s ) might be due to the forbidden transition from 3P0 to 1S0.

Optical Fabrication of Semiconductor Single-Crystalline Microspheres in Superfluid Helium

2014 ◽  
Vol 1635 ◽  
pp. 103-108 ◽  
Author(s):  
Shinya Okamoto ◽  
Satoshi Ichikawa ◽  
Yosuke Minowa ◽  
Masaaki Ashida
Keyword(s):  
Superfluid Helium ◽  
Luminescence Spectra ◽  
Ultraviolet Region ◽  
Optical Fabrication ◽  
Strong Light ◽  
Time Resolved ◽  
Light Matter Interaction ◽  
Time Resolved Photoluminescence ◽  
Spherical Microparticles ◽  
Typical Mode

ABSTRACTWe successfully fabricated semiconductor microspheres of ZnO, ZnSe, etc., by laser ablation in superfluid helium and investigated their morphology and optical properties. Time-resolved photoluminescence spectroscopy in ultraviolet region of single ZnO microspheres shows luminescence spectra with mode structures and remarkable reduction of the luminescence decay time compared to that of polycrystals or non-spherical microparticles. This indicates strong light-matter interaction due to efficient light-confinement in the ZnO microspheres. In addition, the fabricated ZnSe microspheres also show the photoluminescence spectra with typical mode structures indicating their high sphericity.

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