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Journal articles on the topic 'Luminescence spectroscopy'

Author: Grafiati

Published: 4 June 2021

Last updated: 29 July 2024

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1

Gawad, Ahmed A., Tarek M. Salama, Islam Ibrahim, Mohamed Meshref, Gehad G. Mohamed, and Abdallah F. Zedan. "Alleviating Luminescence and Quenching toward Discrimination of Ballpoint Pen Inks Using Spectroscopy and Chromatography Techniques." Applied Sciences 13, no. 16 (August 16, 2023): 9300. http://dx.doi.org/10.3390/app13169300.

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The phenomenon of luminescence and quenching is widely applied in the forensic examination of various ink materials. Here, we introduce a hybrid spectroscopic and chromatography approach to gain insights into the underlying cause of infrared luminescence (IRL) in blue ballpoint (BP) pen inks. A total of thirty BP pen ink samples from the Egyptian market were employed in this study. Insights into the origin of luminescence and quenching in the studied samples were gained based on video spectral comparator (VSC), thin layer chromatography (TLC), ultraviolet–visible (UV–Vis) spectrophotometry, and photoluminescence (PL) spectroscopy. Results showed that some of the studied inks possessed IRL due to the presence of crystal violet and some other triaryl methane dyes. Nevertheless, some ink samples did not possess IRL, despite the presence of the dyes responsible for IRL in their matrix. Interestingly, the inclusion of phthalocyanine dye in those non-luminescent ink matrices resulted in luminescence quenching, mainly due to the overlap between the absorption of phthalocyanine dye and the luminescence of the triarylmethane dyes. The IRL behavior of the ink sample under the first illumination wave band (400–485 nm) exerted control over the IRL activity across subsequent illumination wavebands, and the most effective differentiation was achieved by utilizing the first and second preset filters in VSC. The results revealed the luminescent components present in studied inks and unraveled their distinct luminescence behavior present within the ink matrix. The combination of optical spectroscopy and chromatography techniques could provide a distinctive tool to reveal the luminescence and quenching behaviors of ink dyes for the successful forensic discrimination of several BP writing pens.

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2

Waychunas, G. A. "Luminescence Spectroscopy." Reviews in Mineralogy and Geochemistry 78, no. 1 (January 1, 2014): 175–217. http://dx.doi.org/10.2138/rmg.2014.78.5.

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3

Мирочник, А. Г., Е. В. Федоренко, and А. Ю. Белолипцев. "Люминесценция дитолуоилметаната дифторида бора. Образование J-агрегатов." Оптика и спектроскопия 130, no. 2 (2022): 237. http://dx.doi.org/10.21883/os.2022.02.52006.1717-21.

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The processes of the formation of J-aggregates during the dissolution 2,2-difluoro-4,6-di(4’-methylphenyl)-1,3,2-dioxaborine crystals (1) and their subsequent dissociation have been studied by absorption and luminescence spectroscopy and quantum-chemical modeling. It is shown that two luminescent centers are observed in the solution 1: monomeric luminescence and luminescence of J-aggregates (dual luminescence). Evolution of absorption, luminescence excitation and luminescence spectra is observed over time, indicating a slow dissociation of J-aggregates.

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4

Liu, Li, Ting Gao, Jie Zhou, and Xing Huang. "Preparation of Polymethyl Methacrylate-NaYF₄:Yb:Er Composite Material Used for Holographic Display." Advanced Materials Research 284-286 (July 2011): 2292–95. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.2292.

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In this study, we successfully prepared polymethyl methacrylate (PMMA) /NaYF4:Yb:Er up-conversion composite luminescence material by solution cast method. PMMA was used for polymer matrix, and NaYF4:Yb:Er for rare earth up-conversion luminescence component, and this composite material was prepared for holographic display. Fourier transform infrared spectroscopy (FTIR) and luminescent spectroscopy were measured to analyze structure and luminous performance of the composite material respectively.

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5

Jürgensen, Astrid. "XEOL spectroscopy of lanthanides in aqueous solution." Canadian Journal of Chemistry 95, no. 11 (November 2017): 1198–204. http://dx.doi.org/10.1139/cjc-2017-0038.

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As part of an ongoing study of the electronic interactions between solute and solvent molecules, a method for X-ray excited optical luminescence (XEOL) analysis of aqueous solutions was developed at the double-crystal monochromator beamline (DCM) of the Canadian Synchrotron Radiation Facility (CSRF). It was tested using a series of solutions containing lanthanide ions. The samples were contained in a sample holder for liquids with a 3 μm Mylar window separating them from the vacuum (≤3 × 10−6 torr, 1 torr = 133.3224 Pa) in the solid state absorption chamber of the DCM beamline. Terbium, samarium, and dysprosium have 4 intense and narrow luminescence peaks between 450 and 700 nm, well separated from the luminescence peak of the Mylar window between 300 and 425 nm. The intensity of the rare earth (RE3+) luminescence peaks was lower for the solutions than for solid RECl3·6H2O. In part, this was caused by the lower RE3+ concentration in the solutions than in the solid. In addition, the solvent (water) acts as a quencher. The disorder and the molecular motion in the solution increase the availability of nonradiative de-excitation pathways. A high concentration of SO42− in the solution enhanced the luminescence intensity, probably by inhibiting some nonradiative de-excitation pathways. This study has shown that it is in principle possible to investigate the luminescence of aqueous solutions with XEOL spectroscopy. Furthermore, it is possible to use this technique as a quantitative analytical tool for concentrated luminescent solutions and to study the shielding effects of anions in the solution that increase the luminescence intensity.

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6

Mirochnik A. G., Fedorenko E.V., and Beloliptsev A. Yu. "Luminescence of boron difluoride ditoluoylmethanate. Formation of J-aggregatess." Optics and Spectroscopy 132, no. 2 (2022): 236. http://dx.doi.org/10.21883/eos.2022.02.53212.1717-21.

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The processes of the formation of J-aggregates during the dissolution 2,2-difluoro-4,6-di(4'-methylphenyl)-1,3,2-dioxaborine crystals ( 1) and their subsequent dissociation have been studied by absorption and luminescence spectroscopy and quantum-chemical modeling. It is shown that two luminescent centers are observed in the solution 1: monomeric luminescence and luminescence of J-aggregates (dual luminescence). Evolution of absorption, excitation and luminescence spectra is observed over time, indicating a slow dissociation of J-aggregates. Keywords: luminescence, absorption spectra, boron difluoride complexes, J-aggregates.

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7

Monteiro, Jorge H. S. K. "Recent Advances in Luminescence Imaging of Biological Systems Using Lanthanide(III) Luminescent Complexes." Molecules 25, no. 9 (April 29, 2020): 2089. http://dx.doi.org/10.3390/molecules25092089.

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The use of luminescence in biological systems allows one to diagnose diseases and understand cellular processes. Molecular systems, particularly lanthanide(III) complexes, have emerged as an attractive system for application in cellular luminescence imaging due to their long emission lifetimes, high brightness, possibility of controlling the spectroscopic properties at the molecular level, and tailoring of the ligand structure that adds sensing and therapeutic capabilities. This review aims to provide a background in luminescence imaging and lanthanide spectroscopy and discuss selected examples from the recent literature on lanthanide(III) luminescent complexes in cellular luminescence imaging, published in the period 2016–2020. Finally, the challenges and future directions that are pointing for the development of compounds that are capable of executing multiple functions and the use of light in regions where tissues and cells have low absorption will be discussed.

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8

Bennett, Stacey D., Bryony A. Core, Matthew P. Blake, Simon J. A. Pope, Philip Mountford, and Benjamin D. Ward. "Chiral lanthanide complexes: coordination chemistry, spectroscopy, and catalysis." Dalton Trans. 43, no. 15 (2014): 5871–85. http://dx.doi.org/10.1039/c4dt00114a.

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Luminescent lanthanide complexes bearing amido-bisoxazoline ligands are reported. They were studied using time-resolved luminescence spectroscopy, and were probed for their activity in hydroamination/cyclisation and ring-opening polymerisation catalysis.

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9

de la Torre, Angel, Santiago Medina-Rodríguez, Jose C. Segura, and Jorge F. Fernández-Sánchez. "Self-Referenced Multifrequency Phase-Resolved Luminescence Spectroscopy." Sensors 20, no. 19 (September 24, 2020): 5482. http://dx.doi.org/10.3390/s20195482.

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Phase-resolved luminescence chemical sensors provide the analyte determination based on the estimation of the luminescence lifetime. The lifetime is estimated from an analysis of the amplitudes and/or phases of the excitation and emission signals at one or several modulation frequencies. This requires recording both the excitation signal (used to modulate the light source) and the emission signal (obtained from an optical transducer illuminated by the luminescent sensing phase). The excitation signal is conventionally used as reference, in order to obtain the modulation factor (the ratio between the emission and the excitation amplitudes) and/or the phase shift (the difference between the emission and the excitation phases) at each modulation frequency, which are used to estimate the luminescence lifetime. In this manuscript, we propose a new method providing the luminescence lifetimes (based either on amplitudes or phases) using only the emission signal (i.e., omitting the excitation signal in the procedure). We demonstrate that the luminescence lifetime can be derived from the emission signal when it contains at least two harmonics, because in this case the amplitude and phase of one of the harmonics can be used as reference. We present the theoretical formulation as well as an example of application to an oxygen measuring system. The proposed self-referenced lifetime estimation provides two practical advantages for luminescence chemical sensors. On one hand, it simplifies the instrument architecture, since only one analog-to-digital converter (for the emission signal) is necessary. On the other hand, the self-referenced estimation of the lifetime improves the robustness against degradation of the sensing phase or variations in the optical coupling, which reduces the recalibration requirements when the lifetimes are based on amplitudes.

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10

Rout, Alok, Satendra Kumar, and N. Ramanathan. "Unraveling the coordination approach of Eu(iii) in cyphos nitrate ionic liquid – a comprehensive luminescence spectroscopy study." Dalton Transactions 51, no. 14 (2022): 5534–45. http://dx.doi.org/10.1039/d2dt00422d.

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A luminescent spectroscopy probe is an effective tool to ascertain the precise status of Eu(iii) coordination in the ionic liquid phase. Many of the unrevealed facts in IL based solvent extraction results have been explored by luminescence spectroscopy.

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11

Yakovlev, V. "Time-resolved luminescence spectroscopy study of CsI:Eu crystal." Functional Materials 20, no. 4 (December 25, 2013): 451–56. http://dx.doi.org/10.15407/fm20.04.451.

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12

Rashba, Emmanuel I. "Luminescence and spectroscopy." Journal of Luminescence 100, no. 1-4 (December 2002): 57–64. http://dx.doi.org/10.1016/s0022-2313(02)00433-7.

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13

McClure, Donald S. "Luminescence and spectroscopy." Journal of Luminescence 100, no. 1-4 (December 2002): 47–55. http://dx.doi.org/10.1016/s0022-2313(02)00435-0.

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14

Wild, Urs P., Markus Luond, Erich Meister, and Georg W. Suter. "Total luminescence spectroscopy." Journal of Luminescence 40-41 (February 1988): 270–71. http://dx.doi.org/10.1016/0022-2313(88)90189-5.

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15

Worsfold, P. J. "Molecular luminescence spectroscopy." TrAC Trends in Analytical Chemistry 13, no. 3 (March 1994): ix. http://dx.doi.org/10.1016/0165-9936(94)87082-9.

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16

Worsfold, P. J. "Molecular Luminescence Spectroscopy." Analytica Chimica Acta 183 (1986): 324. http://dx.doi.org/10.1016/0003-2670(86)80110-6.

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17

Roitershtein, Dmitrii M., Lada N. Puntus, Konstantin A. Lyssenko, Ilya V. Taidakov, Evgenia A. Varaksina, Mikhail E. Minyaev, Victor A. Gerasin, et al. "An efficient route for design of luminescent composite materials based on polyethylene containing europium dibenzoylmethanate." New Journal of Chemistry 41, no. 22 (2017): 13663–72. http://dx.doi.org/10.1039/c7nj03055j.

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18

Grzyb, Tomasz, Rafal J. Wiglusz, Vitali Nagirnyi, Aleksei Kotlov, and Stefan Lis. "Revised crystal structure and luminescent properties of gadolinium oxyfluoride Gd4O3F6doped with Eu3+ions." Dalton Trans. 43, no. 18 (2014): 6925–34. http://dx.doi.org/10.1039/c4dt00338a.

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19

Madej, Dominika, and Andrzej Kruk. "Luminescent Properties of (Ca7ZrAl6O18-Ca3Al2O6-CaZrO3):Eu3+ Composite Ceramics and Tracing in the Hydration Process." Molecules 28, no. 23 (November 27, 2023): 7799. http://dx.doi.org/10.3390/molecules28237799.

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In this work, solid-state reaction sintering was used to fabricate Ca7ZrAl6O18-Ca3Al2O6-CaZrO3:Eu3+ ternary composite ceramics and cements. The structural, microstructural, and spectroscopic properties of the ceramics with different Eu2O3 content were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), and spectrofluorimetry, respectively. The XRD patterns analyzed with Rietveld refinement confirm the presence of the orthorhombic phase of Ca7ZrAl6O18 and the cubic phase of Ca3Al2O6 in all the samples, indicating that doping of Eu3+ slightly changes the crystalline structure of both aluminate phosphors. EDS analysis revealed that the Eu doping element was strongly concentrated to the two phases, i.e., Ca7ZrAl6O18 and Ca3Al2O6, with the Eu concentrations of 8.45 wt.% and 8.26 wt.%, respectively. The luminescent properties of the ceramics doped with different Eu3+ ion concentrations were investigated by excitation and emission spectroscopy at room temperature. These results were compiled using a laser with an optical parametric oscillator (OPO) system. The obtained spectra indicated changes in the luminescence intensity and shape occurring with phase composition and Eu2O3 concentration. The emission spectra of the ceramics exhibit a strong dependence on the excitation wavelength in the range from 210 to 300 nm, and invariably, five peaks were assigned to the 5D0 → 7FJ (J = 0, 1, 2, 3, 4) transitions of Eu3+. The luminescence spectroscopy was then used to trace the early and long-term hydration behavior of cements. Thus, luminescence spectroscopy may provide a new tool for non-destructive testing of cement-based structures.

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20

Wu, Mihye, Hyemin Park, Eun Gyu Lee, Sanghun Lee, Yu Jin Hong, and Sungho Choi. "Luminescence Quenching Behavior of Hydrothermally Grown YVO4:Eu3+ Nanophosphor Excited under Low Temperature and Vacuum Ultra Violet Discharge." Materials 13, no. 15 (July 23, 2020): 3270. http://dx.doi.org/10.3390/ma13153270.

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The luminescence quenching behavior and energy transfer process in hydrothermally grown Eu3+-doped YVO4 nanophosphors were studied using low temperature photoluminescence spectroscopy. The luminescence efficiency of nanophosphor is dependent on the acidity of its solution media and the post annealing condition after hydrothermal processing. The overall results suggest that the abnormal luminescence behavior of Eu3+-doped nanocrystalline YVO4 under low temperature photoexcitation is due to the incorporated non-radiative hydroxyl groups often encountered in hydrothermal synthesis as well as to the inefficient energy transfer to luminescent ions from vanadate groups.

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21

Danilov P. A., Kudryashov S. I., Levchenko A. O., Oleynichuk E. A., and Kovalchuk O. E. "Laser-induced luminescent centers in diamond: influence of exposure and duration of short laser pulses." Optics and Spectroscopy 130, no. 4 (2022): 391. http://dx.doi.org/10.21883/eos.2022.04.53723.50-21.

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The optical properties of point luminescent centers formed in the volume IaA-type natural diamond under the action of ultrashort laser pulses in the visible range (515 nm) with durations of 0.3-2.4 ps were investigated. The analysis using confocal Raman spectroscopy demonstrates the formation of nitrogen vacancy centers (NV) and there are no graphitization traces in processing areas. The luminescence amplitude of NV centers depends linearly on the exposure time at different durations of ultrashort laser pulses. Keywords: ultrashort laser pulses, luminescence, luminescent centers in diamond, NV centers.

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22

Myasnikova, L. N., A. G. Maratova, and K. Sh Shunkeyev. "The features of deformation-stimulated RbI luminescence." Eurasian Journal of Physics and Functional Materials 5, no. 4 (December 10, 2021): 218–28. http://dx.doi.org/10.32523/ejpfm.2021050406.

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This paper studies deformation-stimulated features of radiative relaxation of self-trapped excitons and recombination assembly of exciton-like luminescence in RbI crystal. Methods of research were luminescence and thermal activation spectroscopy. The identity of the mechanism of manifestation of the X-ray luminescence, tunnel luminescence and thermally stimulated luminescence spectra were found in the elastically deformed RbI crystal, interpreted by the luminescence of self-trapped exciton, tunnel recharge of F′, VK -pairs and thermally stimulated recombination of e−, VK -centres, respectively.The temperatures of the maximum destruction peaks of thermally stimulated luminescence, their spectral composition and activation energies were determined experimentally, on the basis of which the mechanisms of recombination assembly of exciton-like luminescences in a RbI crystal were interpreted. Uniaxial elastic deformation leads to the effective formation of point radiation defects ( F′, HA, VK -centers) in comparison with an unbroken lattice, where the predominant mechanism is the association of interstitial atoms ( H -centres) with the formation of I3−-centres.

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23

Bunkin, N. F., S. V. Bashkin, P. N. Bolotskova, S. V. Gudkov, and V. A. Kozlov. "Luminescence Intensity ELF Oscillations from a Polymer Membrane in the Aqueous Salt Solutions." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 2 (107) (April 2023): 50–82. http://dx.doi.org/10.18698/1812-3368-2023-2-50-82.

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The paper studies luminescence from the Nafion polymer membrane surface at its swelling in the isotonic aqueous solutions and bi-distilled water using the experimental photo luminescent spectroscopy. Liquid samples were preliminarily treated with the electric pulses with duration of 1 µs and amplitude of 0.1 V using antenna in the form of a flat capacitor. Experiments in photo luminescent spectroscopy were carried out 20 min after the electric pulse treatment. Typical luminescence intensity dependence on the membrane swelling time could be represented as the exponentially decreasing function. Characteristic decay time of the corresponding functions and stationary level of the membrane luminescence intensity depend on the electrical pulses repetition rate. The obtained dependencies could well be reproduced. However, dependence of the luminescence intensity at certain pulse repetition rates appears to be a random function, and the reproducibility is missing. It could be assumed that these stochastic effects are associated with exposure to random external force of the electromagnetic nature acting on the polymer membrane during swelling. Low-frequency pulsations of neutron stars or white dwarfs are the source of this random force according to the authors of the work. This effect is associated with depolarization during the low-frequency electromagnetic field scattering caused by the neutron stars pulsation. Depolarization effect arises due to scattering on long-living anisotropic clusters of nano-bubbles, which, in turn, are becoming anisotropic in the external field of a flat capacitor. Depolarized scattered radiation causes stochastic oscillations of the polymer fibers unwound into the bulk liquid. In this case, luminescence should also acquire the stochastic character taking into account the effect of resonant luminescence energy transfer from a donor to the luminescence acceptor

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24

Lis, Stefan, Slawomir But, Andrzej M. Klonkowski, and Beata Grobelna. "Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutions." International Journal of Photoenergy 5, no. 4 (2003): 233–38. http://dx.doi.org/10.1155/s1110662x03000370.

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Chosen polyoxometalate (POM) anions and their lanthanide(III) complexes, LnPOM, have been synthesized and spectroscopically characterized in solid state, aqueous and non-aqueous solutions. POMs, such as Keggin's, Dawson's and Anderson's type,Na9EuW10O36, compositions that function as inorganic cryptands ([(Na)P5W30O110]14−-Preyssler anion, and [(Na)As4W40O140]27−), containing inorganic(Na+,K+,NH4+)or organic (tetrabutylammonium,NBu4+) counter cations were obtained and their Ln(III) complexes (sandwiched and encapsulated) studied. The synthesized compounds were identified using elemental and thermogravimetric analysis, UV-Vis spectrophotometry and FTIR spectroscopy. The complexation studies were carried out with the use Nd(III) and Er(III) optical absorption and Eu(III) luminescence spectroscopy. Luminescence characterization, including results of intensity, quantum yields and luminescence lifetimes of EuPOM complexes in aqueous, non-aqueous solutions (DMF, DMSO, acetonitryle) and solid are discussed. Based on luminescence lifetime measurements of the Eu(III) ion the hydration numbers of its sandwiched (efficient emitters) and encrypted complexes have been determined and quenching effect discussed. The Eu(III) complexes entrapped in a xerogel matrix have been studied as luminescent materials. Luminescence intensity, lifetime and quantum yield of the EuPOM materials and their photochemical stability, during continuous UV irradiation, were tested.

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25

POTŮČEK, Z., Z. BRYKNAR, and P. PTÁČEK. "Luminescence Spectroscopy of Sn2P2S6Crystals." Ferroelectrics 304, no. 1 (January 2004): 181–85. http://dx.doi.org/10.1080/00150190490456745.

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26

Riehl, James P., and Frederick S. Richardson. "Circularly polarized luminescence spectroscopy." Chemical Reviews 86, no. 1 (February 1986): 1–16. http://dx.doi.org/10.1021/cr00071a001.

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27

Lyon, S. A., and C. L. Petersen. "Ballistic electron luminescence spectroscopy." Semiconductor Science and Technology 7, no. 3B (March 1, 1992): B21—B25. http://dx.doi.org/10.1088/0268-1242/7/3b/005.

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28

Phillips, David. "Advances in Luminescence Spectroscopy." Journal of Photochemistry 33, no. 2 (May 1986): 271–72. http://dx.doi.org/10.1016/0047-2670(86)87045-9.

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29

Stevenson, Christopher L., and Tuan Vo-Dinh. "Laser-Excited Synchronous Luminescence Spectroscopy." Applied Spectroscopy 47, no. 4 (April 1993): 430–35. http://dx.doi.org/10.1366/0003702934334967.

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The use of lasers as excitation sources for molecular luminescence often results in improvements in sensitivity and limits of detection (LODs). Synchronous luminescence (SL) spectroscopy, in which both excitation and emission wavelengths are scanned simultaneously, provides a convenient means to improve selectivity (often dramatically) in the analysis of multicomponent mixtures using room-temperature luminescence. We report here on the first use of a dye laser as an excitation source for SL at room temperature. The performance of the laser synchronous luminescence (LSL) system is described for the analysis of four polyaromatic compounds; for one of these—tetracene—the LOD was 680 zeptomoles (10−21 mol) in the volume probed by the laser. In addition to impressive sensitivity and selectivity, the laser system used is quite small and can be considered as an attractive source for portable SL instruments designed for in-field screening of environmental samples.

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30

Hamaguchi, H., T. Tahara, and M. Tasumi. "Suppression of Luminescence Background in Raman Spectroscopy by Means of Transient Optical Depletion of Causal Impurity Molecules." Applied Spectroscopy 41, no. 8 (November 1987): 1265–68. http://dx.doi.org/10.1366/0003702874447202.

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A simple but highly efficient method of luminescence quenching in Raman spectroscopy is proposed—made on the basis of a newly recognized phenomenon which is ascribable to the optical depletion of luminescent impurity molecules by pulsed-laser excitation. The method has been applied to two typical biological samples: a DNA tetramer (AATT; adenine-adenine-thymine-thymine) and a protein (calmodulin). Suppression of luminescence background by factors of 10–100 was achieved by changing the mode of excitation from cw to pulsed. A model calculation based on semiquantitative estimation of photoexcitation rates successfully accounts for the observed quenching efficiency.

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31

ITOH, Tadashi. "Fundamentals of Laser Spectroscopy. II. Luminescence Spectroscopy." Review of Laser Engineering 28, no. 1 (2000): 54–59. http://dx.doi.org/10.2184/lsj.28.54.

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32

Валиев, Д. Т., О. Л. Хасанов, Э. С. Двилис, В. Д. Пайгин, Ч. Линь, and С. А. Степанов. "Оптические и люминесцентные свойства керамик MgAl-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=-, активированных ионами Eu в высокой концентрации." Оптика и спектроскопия 131, no. 5 (2023): 589. http://dx.doi.org/10.21883/os.2023.05.55709.53-22.

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The series of MgAl2O4 ceramics doped with high level of europium oxide (Eu2O3) up to 15 wt.% was fabricated by the Spark Plasma Sintering technique. The prepared ceramics have been tested using the various experimental techniques: X-ray diffraction, scanning electron microscopy, as well as optical and cathodoluminescence spectroscopy. The influence of europium oxide on the complex of optical and luminescent characteristics of MgAl2O4:Eu ceramics is discussed. The nature of the luminescence centers and the luminescence decay parameters are considered in detail.

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33

Venevtsev I. D., Muslimov A. E., Tarasov A. P., Emiraslanova L. L., Ismailov A. M., and Kanevsky V. M. "X-ray Luminescent Properties of Zinc Oxide Films on the Sapphire M and A-Plane." Optics and Spectroscopy 130, no. 11 (2022): 1458. http://dx.doi.org/10.21883/eos.2022.11.55106.3845-22.

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The results of comparative studies of the processes of high-temperature synthesis, luminescence and scintillation characteristics of ZnO films on M(100)- and A(110)-orientation sapphire substrates are presented. It is shown that the use of the magnetron deposition method makes it possible to form, against the background of a continuous film, ensembles of individual [001] ZnO microcrystals with pronounced X-ray luminescent properties. The X-ray luminescence kinetics is characterized by two components: a fast component with a decay time in the order of a nanosecond and a slow luminescence component. The study of the films by photoluminescence spectroscopy revealed the features of the near-band-edge luminescence spectra of the samples, in particular, the presence of various excitonic emission channels. Differences in the spectral parameters of the near-band-edge luminescence band in the case of optical and X-ray excitation are found and interpreted. Keywords: Films, microcrystals, zinc oxide, X-ray luminescence, photoluminescence, excitonic emission.

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34

Gaft, Michael, Harold Seigel, Gerard Panczer, and Renata Reisfeld. "Laser-induced time-resolved luminescence spectroscopy of Pb2+ in minerals." European Journal of Mineralogy 14, no. 6 (November 25, 2002): 1041–48. http://dx.doi.org/10.1127/0935-1221/2002/0014-1041.

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35

Tóthová, J., J. Sádecká, and P. Májek. "Total luminescence spectroscopy for differentiating between brandies and wine distillates." Czech Journal of Food Sciences 27, No. 6 (December 23, 2009): 425–32. http://dx.doi.org/10.17221/125/2008-cjfs.

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In this study, the differentiation was investigated between brandy and wine distillate samples by fluorescence spectroscopy in combination with multivariate analysis. The samples corresponding to eight brandies from three producers and sixteen wine distillates from five producers were acquired in the local supermarkets. Total luminescence spectra of diluted and undiluted samples were recorded. In order to extract reliable information from the data sets, two multivariate analysis methods, Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA), were applied separately on the excitation and emission spectra. The best differentiation was achieved using the emission spectra (400–470 nm) recorded at the excitation wavelength of 340 nm, or the excitation spectra (240–380 nm) recorded at the emission wavelength of 450 nm. The similarity map defined by the PC1 and PC2 of the PCA performed on the excitation spectra accounted for 94.9% of the total variance (PC1 90.3%, PC2 4.6%) and allowed a good discrimination between the beverages. Although the PCA similarity map defined by the PC1 (84.2%) and PC2 (13.0%) performed on the emission spectra did not lead to a clear discrimination between the beverages, a general trend pointing out the brandies and wine distillates was observed on the map. HCA performed on the excitation spectra provided a better differentiation between the two classes, without any classification error, while HCA performed on the emission spectra allowed 95.8% correct classification.

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36

Bulyga, Dmitry V., Diana A. Gavrilova, Sergey K. Evstropiev, Irina A. Arefina, Maxim K. Myagkih, and Andrey A. Shelemanov. "YAG:Ce Nanophosphors Synthesized by the Polymer–Salt Method for White LEDs with Isomorphic Substitution of Yttrium by Gadolinium." Crystals 13, no. 8 (July 26, 2023): 1156. http://dx.doi.org/10.3390/cryst13081156.

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Fine-dispersed YGdAG:Ce nanopowders with various degrees of isomorphic substitution of yttrium by gadolinium were synthesized. The structure and luminescent properties were studied by X-ray diffraction, attenuated total reflection Fourier-transform infrared spectroscopy, luminescence spectroscopy and scanning electron microscopy. The possibility of synthesis of YGdAG:Ce nanopowders with a degree of gadolinium substitution up to 60% and nanocrystals with average sizes of 25–30 nm were shown. The red-shift of the cerium luminescence band with an increase in Gd content was studied. The CIE diagram for emission of YGdAG:Ce synthesized by the polymer–salt method shows that the degree 30–40% substitution of Y by Gd is optimal for the fabrication of a white light source based on LED with an emission wavelength of 470 nm.

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37

Веневцев, И. Д., А. Э. Муслимов, А. П. Тарасов, Л. Л. Эмирасланова, А. М. Исмаилов, and В. М. Каневский. "Рентгенолюминесцентные свойства пленок оксида цинка на M- и A-плоскостях сапфира." Оптика и спектроскопия 130, no. 11 (2022): 1723. http://dx.doi.org/10.21883/os.2022.11.53780.3845-22.

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The results of comparative studies of the processes of high-temperature synthesis, luminescence and scintillation characteristics of ZnO films on M(100)- and A(110)-orientation sapphire substrates are presented. It is shown that the use of the magnetron deposition method makes it possible to form, against the background of a continuous film, ensembles of individual [001] ZnO microcrystals with pronounced X-ray luminescent properties. The X-ray luminescence kinetics is characterized by two components: a fast component with a decay time in the order of a nanosecond and a slow luminescence component. The study of the films by photoluminescence spectroscopy revealed the features of the near-band-edge luminescence spectra of the samples, in particular, the presence of various excitonic emission channels. Differences in the spectral parameters of the near-band-edge luminescence band in the case of optical and X-ray excitation are found and interpreted.

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38

Molchanova, Anastasiia, Kirill Boldyrev, Nikolai Kuzmin, Alexey Veligzhanin, Kirill Khaydukov, Evgeniy Khaydukov, Oleg Kondratev, Irina Gudim, Elizaveta Mikliaeva, and Marina Popova. "Manganese Luminescent Centers of Different Valence in Yttrium Aluminum Borate Crystals." Materials 16, no. 2 (January 5, 2023): 537. http://dx.doi.org/10.3390/ma16020537.

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We present an extensive study of the luminescence characteristics of Mn impurity ions in a YAl3(BO3)4:Mn crystal, in combination with X-ray fluorescence analysis and determination of the valence state of Mn by XANES (X-ray absorption near-edge structure) spectroscopy. The valences of manganese Mn2+(d5) and Mn3+(d4) were determined by the XANES and high-resolution optical spectroscopy methods shown to be complementary. We observe the R1 and R2 luminescence and absorption lines characteristic of the 2E ↔ 4A2 transitions in d3 ions (such as Mn4+ and Cr3+) and show that they arise due to uncontrolled admixture of Cr3+ ions. A broad luminescent band in the green part of the spectrum is attributed to transitions in Mn2+. Narrow zero-phonon infrared luminescence lines near 1060 nm (9400 cm−1) and 760 nm (13,160 cm−1) are associated with spin-forbidden transitions in Mn3+: 1T2 → 3T1 (between excited triplets) and 1T2 → 5E (to the ground state). Spin-allowed 5T2 → 5E Mn3+ transitions show up as a broad band in the orange region of the spectrum. Using the data of optical spectroscopy and Tanabe–Sugano diagrams we estimated the crystal-field parameter Dq and Racah parameter B for Mn3+ in YAB:Mn as Dq = 1785 cm−1 and B = 800 cm−1. Our work can serve as a basis for further study of YAB:Mn for the purposes of luminescent thermometry, as well as other applications.

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39

Zhang, Hong Yan, Jun Wang, and Shao Hua Fan. "Bifunctional Fe₃O₄@SiO₂@Eu-Polyoxometalates Nanoparticles and Study on their Magnetism and Luminescence." Advanced Materials Research 284-286 (July 2011): 2224–29. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.2224.

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In this paper, we report the synthesis of the bifunctional Fe3O4@SiO2@Eu-polyoxometalates particles. The magnetite nanoparticles (Fe3O4) homogeneously coated with silica spheres prepared with the Stöber method. The so-obtained Fe3O4@SiO2 core/shell particles were modified by 3-aminopropyltriethoxysilane and finally grafted with the luminescent Europium -polyoxometalates. The core-shell particles were characterized by scanning electron microscopy, transmission electron microscopy, FT-IR, UV, magnetism and luminescence spectroscopy. The results indicated that the core-shell particles show both interesting luminescence and magnetic properties.

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40

Borodina, Lyubov’, Vladimir Borisov, Kirill Annas, Aliaksei Dubavik, Andrey Veniaminov, and Anna Orlova. "Nanostructured Luminescent Gratings for Sensorics." Materials 15, no. 22 (November 18, 2022): 8195. http://dx.doi.org/10.3390/ma15228195.

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Two-dimensional holographic structures based on photopolymer compositions with luminescent nanoparticles, such as quantum dots, are promising candidates for multiresponsive luminescence sensors. However, their applicability may suffer from the incompatibility of the components, and hence aggregation of the nanoparticles. We showed that the replacement of an organic shell at the CdSe/ZnS quantum dots’ surface with monomer molecules of the photopolymerizable medium achieved full compatibility with the surrounding medium. The effect was demonstrated by luminescence spectroscopy, and steady-state and time-resolved luminescent laser scanning microscopy. We observed the complete spectral independence of local photoluminescence decay, thus proving the absence of even nanoscale aggregation, either in the liquid composition or in the nodes and antinodes of the grating. Therefore, nanostructured luminescent photopolymer gratings with monomer-covered quantum dots can act as hybrid diffractive–luminescent sensor elements.

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Sharma, Madhulika, D. Gupta, D. Kaushik, A. B. Sharma, and R. K. Pandey. "Highly Luminescent Inverted ZnS/CdS Core/Shell Quantum Dots." Journal of Nanoscience and Nanotechnology 8, no. 8 (August 1, 2008): 3949–54. http://dx.doi.org/10.1166/jnn.2008.195.

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Synthesis of highly luminescent and monochromatic inverted core–shell structures utilizing ZnS/CdS quantum dots (QDs) has been investigated. The core/shell quantum dots have been characterized using grazing angle X-ray diffraction (XRD), Transmission electron microscopy, Optical absorption and luminescence spectroscopy. The results suggested that passivation of surface states along with an increased localization of electron and hole in CdS shell layer, give rise to increased monochromaticity with higher quantum yield. The possibility of using the inverted core–shell structure as an additional parameter for tuning the color of luminescence has also been discussed.

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42

Sidorov A.I., Leks E. Y., Podsvirov O.A., and Vinogradov A. Y. "Crystallization and silicon carbide formation in two-layer amorphous silicon-carbon films during electron irradiation." Technical Physics 67, no. 11 (2022): 1475. http://dx.doi.org/10.21883/tp.2022.11.55178.180-22.

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It is shown that the irradiation by focused electron beam with electron energy of 10 keV of two-layer amorphous silicon-carbon films 60 nm thick results in films partial crystallization. Moreover, in the irradiated zone the layer of crystalline silicon carbide with luminescent properties is formed. The observed effects are confirmed by methods of Raman spectroscopy and by luminescence spectra Keywords: silicon, carbon, silicon carbide, film, structure, electron beam, Raman spectroscopy.

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43

Ricci, Giulia, Andrea Maurizio Monti, Renato Pagano, Marco Martini, Luisa Caneve, and Gilberto Artioli. "Unusual Luminescence of Quartz from La Sassa, Tuscany: Insights on the Crystal and Defect Nanostructure of Quartz." Minerals 11, no. 12 (November 30, 2021): 1345. http://dx.doi.org/10.3390/min11121345.

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Quartz from La Sassa (Tuscany, Italy) presents a unique luminescence related to intrinsic and extrinsic defects in the crystal lattice due to the growth mechanisms in hydrothermal conditions. The bright fluorescence under the UV lamp was apparent to collectors since the early 1970s, and it entered the literature as a reference case of yellow-luminescent quartz. Early reports present the history of the discovery, the geological context, and preliminary luminescence measurements of the quartz nodules, suggesting various activators as potentially responsible of the peculiar luminescence effects: uranyl groups (UO22+), rare earths (Tb3+, Eu3+, Dy3+, Sm3+, Ce3+) and polycyclic aromatic compounds (PAH). Here, we report a full investigation of the La Sassa material, by a multi-analytical approach encompassing cathodoluminescence optical microscopy (OM-CL), laser-induced fluorescence (LIF), wavelength resolved thermally stimulated luminescence (WR-TSL), trace elements analysis by mass spectrometry (ICP-MS) and Raman spectroscopy (RS). The results provide a significant step forward in the interpretation of the luminescence mechanisms: the main luminescent centres are identified as alkali-compensated (mainly Li+ and Na+, K+ and H+) aluminum [AlO4/M+]0 centres substituting for Si, where the recombination of a self-trapped exciton (STE) or an electron at a nonbridging oxygen hole centre (NBOHC) are active.

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44

Wang, Rui, Jianguo Tang, Na Kong, Yao Wang, Jixian Liu, and Jingquan Liu. "A Nano-Silver Enhancement Effect on the Luminescence of a Ligand–Eu3+ Complex via a SiO2 Spacer." Australian Journal of Chemistry 67, no. 4 (2014): 644. http://dx.doi.org/10.1071/ch13593.

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Luminescent rare earth complex (REC) nanocomposites, Eu(TTA)3Phen attached onto Ag@SiO2 nanoshells, were fabricated by facile wet chemistry and self-assembly techniques. Transmission electron microscopy, and fourier transform infrared and UV–Vis spectroscopy were used to investigate the step-by-step fabrication. The luminescence of REC was significantly enhanced using a silver core (size: 45 nm) surrounded by a 20-nm thick silica shell. Thicker or thinner silica shells afforded tuning of the metal-enhanced luminescence. The thiophene-TTA-containing REC fluorophore was able to etch the silver core, resulting in hollow silica shells, consequently displaying no luminescence enhancing capabilities. The etching efficiency was proportional to the concentration of Eu(TTA)3Phen, and decreased with increasing shell thickness.

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45

DULDA, A., D. S. JO, M. TAKAKI, and D. H. YOON. "MILLING EFFECT AND ENHANCED LUMINESCENCE PROPERTY OF BAM NANOPHOSPHOR VIA SURFACE MODIFICATIONS." Nano 04, no. 06 (December 2009): 367–70. http://dx.doi.org/10.1142/s1793292009001873.

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Surface modification of luminescent nanomaterials has attracted considerable technological interest. With decreasing particle size, the passivation of surface defects is of vital importance. This paper reports the effect of an alkali (KOH) solution treatment and organic functional groups on the luminescence efficiency and particle dispersibility. Fourier transform infrared spectroscopy provided clear evidence of surface modification with organic functional groups from the C=O , C–H , and C–O stretching modes at 1740, 1365, and 1218 cm-1. The KOH-treated sample showed a 40% increase in luminescence intensity, whereas 87% increase in luminescence intensity was obtained from the dispersion-agent-containing sample. To the best of our knowledge, this is the highest efficiency improvement for sub-micrometer-sized BAM: Eu2+ phosphors reported thus far.

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46

Sivasankar, V. S., and P. W. M. Jacobs. "Luminescence spectroscopy of CsI: Tl+." Philosophical Magazine B 51, no. 5 (May 1985): 479–88. http://dx.doi.org/10.1080/13642818508244481.

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47

Vo-Dinh, Tuan, DeLyle Eastwood, and Alan Townshend. "Laser techniques in luminescence spectroscopy." Analytica Chimica Acta 243 (1991): 323. http://dx.doi.org/10.1016/s0003-2670(00)82581-7.

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48

Gorobets, Boris S., Alexander M. Portnov, and Alexander A. Rogozhin. "Luminescence spectroscopy of the earth." Radiation Measurements 24, no. 4 (October 1995): 485–91. http://dx.doi.org/10.1016/1350-4487(94)00124-j.

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49

Deveaud, Benoît. "Subpicosecond luminescence spectroscopy of heterostructures." Applied Surface Science 50, no. 1-4 (June 1991): 63–64. http://dx.doi.org/10.1016/0169-4332(91)90139-b.

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50

Feldbach, Eduard, Marco Kirm, Jelena Kozlova, Aarne Maaroos, Hugo Mändar, Rando Saar, and Väino Sammelselg. "Luminescence spectroscopy of nanocrystalline MgO." physica status solidi (c) 8, no. 9 (May 23, 2011): 2669–72. http://dx.doi.org/10.1002/pssc.201084091.

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