Investigation of the thermal quenching of two emission centers in Sr9MnLi(PO4)7:Eu2+ using time-resolved technique

2020 ◽  
Vol 22 (27) ◽  
pp. 15632-15639
Author(s):  
Fengfeng Chi ◽  
Wenjuan Dai ◽  
Bin Jiang ◽  
Bibo Lou ◽  
Xiantao Wei ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Emission Spectra ◽  
Time Resolved ◽  
Luminescent Centers ◽  
Schematic Diagrams

The emission spectra of two luminescent centers in Sr9MnLi(PO4)7:Eu2+ and the corresponding schematic diagrams of luminescence thermal quenching.

scholarly journals Spectroscopic study of barite from the Kremikovtsi Deposit (Bulgaria) with implication for its origin

2006 ◽  
pp. 101-108 ◽  
Author(s):  
Maya Dimova ◽  
Gerard Panczer ◽  
Michael Gaft
Keyword(s):  
Ir Spectra ◽  
Crystal Lattice ◽  
Emission Spectra ◽  
Time Resolved ◽  
Genetic Types ◽  
Luminescent Spectra ◽  
Luminescent Centers ◽  
First Time ◽  
Ir And Raman ◽  
532 Nm

Different genetic types (endogene and supergene) of barite from the Kremikovtsi deposit (Bulgaria) were studied by Laser-induced time-resolved luminescence (LITRL), Infrared (IR) and Raman spectroscopy. The IR spectra of the endogene barites are quite similar to those reported in the literature and do not show appreciable differences among them. The IR spectra of the supergene barites are almost identical to those of the endogene ones in respect to the positions of the vibrational modes ?1, ?2 and ?4 of SO4 2 except for a shift of 3 cm-1 for the ? 3 band. They displayed a presence of additional bands, which are close to the ?3 and ?1 modes of CO3 2- in calcite. The Raman studies support the suggestion that the supergene barite contains traces of calcite. The modern LITRL technique allowed the detection of several luminescent centers in the endogene barite. Eu3+ luminescence was identified for the first time in barite. The different emission spectra at 266 and 532 nm excitations suggest there are at least 2 structural positions for Eu3+ in the barite crystal lattice. The luminescent spectra also revealed a rather unusual violet-blue Nd3+ emission, which usually occurs in the IR spectral range, as well as emissions of Ce3+, Eu2+, Tb3+, Ag+, Sn2+(?) and UO2 2+. The oxidation state of cations isomorphically present in the barite crystal lattice suggests the endogene barite in the Kremikovtsi deposit precipitated from reduced fluids supposedly subjected to cooling (conductive/convective) and oxidation (mixing with seawater).

Optical, electrochemical and third-order nonlinear optical studies of triphenylamine substituted zinc phthalocyanine

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1173-1181 ◽  
Author(s):  
Narra Vamsi Krishna ◽  
Puliparambil Thilakan Anusha ◽  
S. Venugopal Rao ◽  
L. Giribabu
Keyword(s):  
Nonlinear Optical ◽  
Emission Spectra ◽  
Optical Emission ◽  
Soret Band ◽  
Laser Pulses ◽  
Zinc Phthalocyanine ◽  
Third Order ◽  
Time Resolved ◽  
Nlo Properties ◽  
Scan Data

Zinc phthalocyanine possessing triphenylamine at its peripheral position has been synthesized and its optical, emission, electrochemical and third-order nonlinear optical (NLO) properties were investigated. Soret band was broadened due to the presence of triphenylamine moiety. Electrochemical properties indicated that both oxidation and reduction processes were ring centered. Emission spectra were recorded in different solvents and the fluorescence yields obtained were in the range of 0.02–0.17 while the time-resolved fluorescence data revealed radiative lifetimes of typically few ns. Third-order NLO properties of this molecule have been examined using the Z-scan technique with picosecond (ps) and femtoseocnd (fs) pulses. Closed and open aperture Z-scan data were recorded with 2 ps/1 50 fs laser pulses at a wavelength of 800 nm and NLO coefficients were extracted from both the data. Our data clearly suggests the potential of this molecule for photonics applications.

scholarly journals Люминофоры холодного голубого излучения на основе оксида алюминия, допированного диспрозием

2022 ◽  
Vol 64 (1) ◽  
pp. 95
Author(s):  
И.В. Бакланова ◽  
В.Н. Красильников ◽  
А.П. Тютюнник ◽  
Я.В. Бакланова
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Diffraction Analysis ◽  
Powder Diffraction ◽  
Thermal Quenching ◽  
Emission Spectra ◽  
X Ray ◽  
White Emission ◽  
Uv Excitation ◽  
Quenching Of Luminescence

Al2О3:Dy3+ oxides with different colors luminescence were synthesized using precursor technology. The phase composition and crystal structure of the obtained materials were established by X-ray powder diffraction analysis. The excitation and emission spectra, decay curves, thermal quenching of luminescence were studied. Under UV excitation, the phosphors exhibit blue, purplish blue, white emission depending on the concentration of dysprosium and the temperature of annealing of the Al1-xDyx(OH)(HCOO)2 precursor in air.

Time-resolved x-ray emission spectra from optically ionized helium and neon plasmas

1998 ◽  
Vol 57 (1) ◽  
pp. 982-993 ◽  
Author(s):  
T. E. Glover ◽  
J. K. Crane ◽  
M. D. Perry ◽  
R. W. Lee ◽  
R. W. Falcone
Keyword(s):  
Emission Spectra ◽  
Time Resolved ◽  
X Ray

Modelling the thermal quenching mechanism in quartz based on time-resolved optically stimulated luminescence

2010 ◽  
Vol 130 (5) ◽  
pp. 902-909 ◽  
Author(s):  
V. Pagonis ◽  
C. Ankjærgaard ◽  
A.S. Murray ◽  
M. Jain ◽  
R. Chen ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Optically Stimulated Luminescence ◽  
Quenching Mechanism ◽  
Time Resolved

Energy and Charge Transfer in Electroluminescent Polymer/Porphyrin Blends

1999 ◽  
Vol 560 ◽  
Author(s):  
V. Cleave ◽  
G. Yahioglu ◽  
P. Le Barny ◽  
R.H. Friend ◽  
N. Tessler ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Charge Separation ◽  
Emission Spectra ◽  
Time Resolved ◽  
Show Evidence ◽  
Homo And Lumo ◽  
Lumo Level ◽  
Photoluminescence Efficiency ◽  
Absorption Measurements ◽  
Triplet Excitons

ABSTRACTWe present a study of the effects of blending electroluminescent polymers with platinum (II) octaethylporphyrin (PtOEP). We find that in the case of polymers which are measured to have HOMO and LUMO levels respectively below and above those of the PtOEP, and which have emission spectra overlapping the PtOEP absorption spectra, energy transfer occurs as expected. We find further evidence, in the form of steady state and time-resolved electroluminescence and photoluminescence measurements, which indicates additional transfer of triplet excitons between polymer and porphyrin. Where the polymers have emission spectra overlapping the absorption spectra of PtOEP, but which are measured to have a HOMO or LUMO level between those of the porphyrin, quenching of the photoluminescence efficiency occurs. We propose this is due to charge separation between the porphyrin and the polymer, and show evidence for this in the form of photoinduced absorption measurements.

Luminescence thermal quenching ofCr3+in zirconium-barium-based fluoride glasses investigated by time-resolved laser spectroscopy

1991 ◽  
Vol 44 (10) ◽  
pp. 4759-4770 ◽  
Author(s):  
R. Balda ◽  
J. Fernández ◽  
M. A. Illarramendi ◽  
M. A. Arriandiaga ◽  
J. L. Adam ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Thermal Quenching ◽  
Time Resolved ◽  
Fluoride Glasses

Distribution of Vibrational States of CO2in the Reaction O(1D) + CO2from Time-Resolved Fourier Transform Infrared Emission Spectra

2009 ◽  
Vol 113 (15) ◽  
pp. 3431-3437 ◽  
Author(s):  
Hui-Fen Chen ◽  
Hung-Chu Chiang ◽  
Hiroyuki Matsui ◽  
Soji Tsuchiya ◽  
Yuan-Pern Lee
Keyword(s):  
Fourier Transform ◽  
Emission Spectra ◽  
Fourier Transform Infrared ◽  
Infrared Emission ◽  
Vibrational States ◽  
Time Resolved

Spectroscopic System for Direct Lanthanide Photoluminescence Spectroscopy with Nanomolar Detection Limits

2009 ◽  
Vol 63 (5) ◽  
pp. 483-493 ◽  
Author(s):  
Christopher M. Andolina ◽  
William G. Holthoff ◽  
Phillip M. Page ◽  
Ryan A. Mathews ◽  
Janet R. Morrow ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Ethylenediaminetetraacetic Acid ◽  
Bound Water ◽  
Emission Spectra ◽  
Lanthanide Ions ◽  
Visible Range ◽  
Time Resolved ◽  
Nanomolar Detection ◽  
Time Resolved Photoluminescence ◽  
The Eu

A new spectroscopic system for direct photoluminescence of lanthanide ions (Ln(III)) through electronic transitions within the 4fn manifold is described. The system is based on an injection seeded frequency tripled (λ = 355 nm) Nd:YAG pump laser coupled with a master oscillator power oscillator (MOPO). The MOPO delivers an average pulse energy of ⪝60 mJ/pulse, is continuously tunable from 425 to 690 nm (Signal) and 735 to 1800 nm (Idler) with a linewidth of <0.2 cm−1, and has a pulse duration of 10–12 ns. Aqueous solutions containing two polyaminocarboxylate complexes, ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA), and Ln3+ aqua ion for several lanthanides including Eu(III), Tb(III), Dy(III), and Sm(III)) are used as steady-state and time-resolved photoluminescence standards. The versatility of the instrument is demonstrated by excitation scans over a broad visible range for aqueous solutions of complexes of Eu(III), Dy(III), Sm(III), and Tb(III). The Eu(III) excitation band (7Fo→5Do) is recorded over a range of complex concentrations that are 1000–fold less than reported previously, including Eu(EDTA) (1.00 nM), Eu(DTPA) (1.00 nM), and Eu(III) aqua ion (50.0 nM). Emission spectra are recorded in the visible range for Ln(III) complexes at pH 6.5 and 1.00 mM. Excited-state lifetimes for the standards were constant as a function of concentration from 10.0 nM to 1.00 mM for Eu(EDTA) and Eu(DTPA) and from 100 nM to 1.00 mM for Eu(III) aqua ion. Photoluminescence lifetimes in H2O and D2O are recorded and used to calculate the number of bound water molecules for all complexes.

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