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Selective laser spectroscopy of a highly dispersed Bi4Ge3O12 scintillator doped with Pr3+ ions
Optical Materials. 2022. Vol. 128. Article 112330.
Alimov O., Doroshenko M., Egorysheva A., Gajtko O., Pierpont K., Shodiev H., Veselova V.
The optical properties of a highly dispersed bismuth orthogermanate powder (HDP_BGO) were studied at 300 K. The fluorescence of undoped HDP_BGO under ultraviolet (UV) excitation (266nm) was shown to result from Frenkel excitons. The HDP_BGO fluorescence decay kinetics under UV excitation had a complex decay form similar to that of BGO single crystal and was a sum of four exponentialswith lifetimes τ 1, 2, 3, 4– 0.16/0.30/0.70/2.7 μs respectively. Two types of Pr ions optical centers with lifetimes of ~5.0 and 85 μs have been determined in a HDP_BGO: Pr3+. The resonance energy transfer of the electronic excitation from the HDP_BGO to Pr3ions was identified. The effect of Pr3+ ions on the HDP_BGO fluorescence lifetime reduction from 160 to 35 ns was established.
Гущина В. А., / Series chemrxiv-2023-vpzhz-v2 "ChemRxiv". 2023.
All-inorganic perovskite CsPbBr3 and Cs4PbBr6 nanoparticles are being intensively studied due to their unique properties and wide range of applications; however, however, the nature of their optical properties is not yet fully understood due to the difficulty of synthesis of singlephase nanoparticles. In this article we describe the features of the synthesis of single-phase particles ...
Added: May 14, 2026
Sautenkov V., Saakyan S., Bobrov A. et al., Journal of Quantitative Spectroscopy and Radiative Transfer 2026 Vol. 351 Article 109796
We discuss nonlinear spectra of selective reflection from high-density rubidium atomic vapor, where the self-broadening of the resonant transition 5S1/2 - 5P3/2 dominates over the Doppler width. In the experiments, the hole-burning technique with probe and pump lasers is used. The reflection of weak probe beam is investigated at four atomic densities in the range ...
Added: January 11, 2026
Erzunov D., Alekseeva A., Sarvin I. et al., Journal of Porphyrins and Phthalocyanines 2024 Vol. 28 No. 09n10 P. 701–709
Peripheral phenyl-substituted metal phthalocyanines with thio and oxa substitution in the spacer bridge fragment were obtained in the work. Spectroscopic properties were studied for the obtained complexes, and the main patterns of behavior and characteristics change depending on the solvent and the nature of the spacer atom. It is shown that the replacement of an oxygen ...
Added: September 16, 2025
Курмаз С. В., Иванова И., Фадеева Н. В. et al., Известия Академии наук. Серия химическая 2023 Т. 72 № 6 С. 1349–1365
Polymer compositions of folic acid based on an amphiphilic copolymer of N-vinylpyrrolidone with methacrylic acid branched with triethylene glycol dimethacrylate have been developed and characterized by the methods of DLS, 1H NMR, IRS, DSC and TGA in solutions and in solid state. The effective binding constants of folic acid to copolymer in isopropyl alcohol and ...
Added: September 14, 2025
Ivanova A., Polikovskiy T., Victoria E. Gontcharenko et al., Sensors and Actuators, A: Physical 2024 Vol. 379 Article 115969
Luminescence thermometry, leveraging the temperature-dependent luminescent properties of coordination compounds, offers precise and remote temperature measurement. However, many existing luminescent thermometers exhibit a narrow peak in temperature sensitivity, restricting their effective operating range. In this study, we synthesized new complexes [LnL2(NO3)(TPPO)2], where Ln = Eu (1), Tb (2), Gd (3), Tb0.94Eu0.06 (4), (HL - 4,4,4-trifluoro-1-(furan-2-yl) ...
Added: November 22, 2024
Zelener B. B., Vilshanskaya E. V., Morozov N. V. et al., Physical Review Letters 2024 Vol. 132 No. 11 Article 115301
In this Letter we discuss our approach that makes possible creation of the steady-state ultracold plasma having various densities and temperatures by means of continuous two-step optical excitation of calcium atoms in the magneto-optical trap. A strongly coupled ultracold plasma can be used as an excellent test platform for studying many-body interactions associated with various ...
Added: March 16, 2024
Бобров А. А., Saakyan S., Саутенков В. А. et al., Письма в Журнал экспериментальной и теоретической физики 2021 Т. 114 № 9 С. 604–607
The dipole–dipole broadening of the spectrum of the selective reflection of intense resonance light from the interface between a transparent dielectric and a gas of the natural mixture of Rb isotopes has been studied experimentally. The case of a high gas density where the Doppler broadening can be neglected has been investigated. It has been ...
Added: February 5, 2023
Федосеева Е. В., Григорьева И. Ю., Николаева О.В. et al., Вопросы современной альгологии 2020 № 2(23) С. 40–45
Algae tests are widely used due to the availability of cultivation conditions and high reproducibility. Freshwater and marine algae are used to estimate the toxicity of drinking, natural and wastewater, water extracts from soils, sewage sludge and production and consumption waste. The presence of dissolved organic matter in the samples, stimulating the growth of algae ...
Added: July 8, 2022
Khoroshutin A. V., Lypenko D. A., Korlyukov A. et al., Synthetic Metals 2022 Vol. 287 Article 117094
A series of tricyclic naphthothiophenes – photocyclization products (8-methoxynaphtho[1,2-b]thiophene; 6,7-dimethoxynaphtho[1,2-b]thiophene; 8-methoxynaphtho[2,1-b]thiophene) have been studied. HOMO and LUMO levels, as well as a gap between them was accessed by cyclic voltammetry and optical spectroscopy. Double potential step chronoamperometry showed that the former naphthothiophene exhibits slower current decay than the other substances. Charge carrier mobility measured by the CELIV technique was ...
Added: June 7, 2022
Kovaleva M., Manevitch L. I., Physica Scripta 2021 Vol. 96 No. 12 Article 125035
In this report we consider two weakly coupled Schrödinger equations as a reduced model of interchain energy transport in the DNA double-helix torsional model. We employ a reduction of the Yakushevich-type model that considers the torsional dynamics of the DNA as effective chains of pendula. In previous works, only small amplitude excitations and stationary dynamics ...
Added: February 14, 2022
Smirnov V., Kovaleva M., Manevitch L. I., Nonlinear Dynamics 2022 P. 1819–1837
We present the results of the analytical as well as numerical study of the stationary and nonstationary dynamics of the sine-lattice. The latter is the discrete constitutive model used in various fields of physics, in particular, for the description of flexible polymers, quasi-one-dimensional spin chains, biopolymers, etc. To analyze the sine-lattice dynamics, we introduce the complex functions that allow us to determine the nonlinear normalmodes as ...
Added: February 14, 2022
Selyukov A. S., Ю.Г. Вайнер, Vitukhnovsky A. G., Квантовая электроника 2020 Т. 50 № 3 С. 252–254
Samples of inverted photonic-crystal films, containing planar and rolled-up (in the form of scrolls) CdSe nanocrystals, are studied. The transmission spectra of these structures are recorded These spectra (along with the change in colour) confirm the incorporation of nanocrystals into the films. The photoluminescence decay dynamics is investigated. It is shown that the photonic-crystal matrix ...
Added: October 18, 2021
Beliaev L., Takayama O., Melentiev P. N. et al., OPTO-ELECTRONIC ADVANCES 2021 Vol. 4 No. 8 Article 210031
Photoluminescence including fluorescence plays a great role in a wide variety of applications from biomedical sensing and imaging to optoelectronics. Therefore, the enhancement and control of photoluminescence has immense impact both on fundamental scientific research and aforementioned applications. Among various nanophotonic schemes and nanostructures to enhance the photoluminescence, we focus on a certain type of ...
Added: October 16, 2021
Sautenkov V., Saakyan S., Zelener B., Journal of Quantitative Spectroscopy and Radiative Transfer 2020 Vol. 256 P. 1–6
We report an experimental study of nonlinear radiation trapping in a high-density rubidium vapor where the self-broadening of the resonance transitions 5S1/2 − 5P3/2 exceeded the Doppler broadening. The atomic number densities used were N1 = 3 × 10^16 cm^−3 and N2 = 8 × 10^16 cm^−3. In our experiment, a signal of retro-fluorescence was ...
Added: June 21, 2021
P. V. Dolganov, K. D. Baklanova, Bobrovsky A. Y., Liquid Crystals 2021 Vol. 48 No. 9 P. 1339–1348
We report complex optical investigations of polymer-stabilised cholesteric photonic liquid crystal doped by a dichroic fluorescent dye. For the first time, we employed a combination of various experimental methods, including measurements of spectra of transmission, reflection, rotation of the plane of polarisation of light, fluorescence, to characterise the properties of the photonic crystal. The peculiarity ...
Added: January 19, 2021
Yorov K. E., Khodan A. N., Baranchikov A. E. et al., Microporous and Mesoporous Materials 2020 Vol. 293 Article 109804
A straightforward and facile procedure for the fabrication of superhydrophobic luminescent 3D nanomaterials was developed. Chemical modification of ultra-lightweight highly porous nanostructured aluminum oxyhydroxide (NOA) monoliths in 8-hydroxyquinoline vapors resulted in the formation of tris(8–hydroxyquinoline)aluminum on the surface of NOA nanofibrils. The original shape and size of the initial NOA monolith and its internal 3D ...
Added: May 27, 2020
Алфёрова В. А., Shuvalov M., Сучкова Т. et al., Amino Acids 2019 Vol. 50 No. 12 P. 1697–1705
Added: April 24, 2020
Vladimir A. Korshun, Amino Acids 2018 Vol. 50 No. 12 P. 1697–1705
4-Chloro-l-kynurenine (3-(4-chloroanthraniloyl)-l-alanine, l-4-ClKyn), an amino acid known as a prospective antidepressant, was recently for the first time found in nature in the lipopeptide antibiotic taromycin. Here, we report another instance of its identification in a natural product: 4-chloro-l-kynurenine was isolated from acidic hydrolysis of a new complex peptide antibiotic INA-5812. l-4-ClKyn is a fluorescent compound responsible for the ...
Added: November 8, 2019
Vladimir A. Korshun, Journal of Organic Chemistry 2017 Vol. 82 No. 19 P. 10015–10024
Oligonucleotide probes labeled with pyrene pairs that form excimers have a number of applications in hybridization analysis of nucleic acids. A long excited state lifetime, large Stokes shift, and chemical stability make pyrene excimer
an attractive fluorescent label. Here we report synthesis of chiral phosphoramidite building blocks based on (R)-4- amino-2,2-dimethylbutane-1,3-diol, easily available from an inexpensive D-(−)-pantolactone. ...
Added: November 8, 2019
Vladimir A. Korshun, Prokhorenko I., Golovin A., Tetrahedron 2017 Vol. 73 No. 23 P. 3220–3230
1-Phenylethynylpyrene fluorophore (1-PEPy) has long-wavelength shifted emission and higher photostability
compared to pyrene, retaining, however, pyrene's ability to form excimers. Here we report the
synthesis of 2'-O-[3(and 4)-(pyren-1-ylethynyl)benzyl]-uridines and their tandem incorporation into
deoxyribo- and 2'-O-Me-ribo-oligonucleotide probes. Excimer forming probes of type NN … NNXXNN …
NN (X = 2'-O-[meta(or para)-(pyren-1-ylethynyl)-benzyl]uridine) containing two adjacent fluorescent
nucleosides within an oligonucleotide are ...
Added: November 6, 2019