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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Edelman I. S., Sokolov A. Е., Sukhachev A. L., Temerov V. L., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Valiev U. V.
Заглавие : Optical absorption and luminescence of Tm3+ and Yb3+ ions in huntite structure
Место публикации : Республиканская конференция «Оптические методы в современной физике», Ташкент, Узбекистан, 2008, с. 33-35
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrovsky A. S., Gudim I. A., Krylov A. S, Temerov V. E.
Заглавие : Luminescence of manganese ions in yttrium aluminium borate
Место публикации : 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, Lyon, 2008, p.482
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen W., Gao H., Molokeev M. S., Chen Q., Geng X., Mei L., Min X., Ma B.
Заглавие : Luminescence enhancement effects of CaxSr2‒xNb2O7:Er3+,Tm3+ phosphors for temperature sensing and anti-counterfeiting applications
Колич.характеристики :10 с
Место публикации : J. Rare Earths. - 2025. - Vol. 43, Is. 7. - P.1345-1354. - ISSN 10020721 (eISSN), DOI 10.1016/j.jre.2024.06.022
Примечания : Cited References: 55. - Project supported by the Science and Technology International Cooperation Project of Qinghai Province (2022-HZ-807) and the Open Project Salt Lake Chemical Engineering Research Complex, Qinghai University (2023-DXSSZZ-04)
Аннотация: Er3+- and Tm3+-doped CaxSr2‒xNb2O7 (CxS2‒xN, x = 0.6, 0.8, 1.0, 1.2, 1.4) phosphors with layered perovskite structure were designed. These phosphors exhibit a dominant emission peak at 549 nm under 980 nm laser excitation, attributed to the 4S3/2→4I15/2 transition. By increasing the content of Ca2+, the crystal field regulation of rare earth ions is realized and the luminescence enhancement is induced, which is manifested by the increase of 2H11/2,4S3/2→4I15/2 emission. Furthermore, the temperature sensing sensitivities of C0.6S1.4N:Er,Tm and C0.6S1.4N:Er,Tm based on non-thermally coupled energy levels were studied. Finally, an anti-counterfeiting imprint was prepared using phosphors, which have high brightness and excellent photothermal stability. This work not only confirms that closer ionic radii substitution enables to increase the electronic density of states, improve the crystal field symmetry and enhance the luminescence, but also provides a promising phosphor system for temperature sensing and anti-counterfeiting applications, opening up new prospects in the optimization of the optical properties of phosphors.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Titov R. A., Smirnov M. V., Bobreva L. A., Teplyakova N. A., Palatnikov M. N., Biryukova I. V., Masloboeva S. M., Krylov A. S., Vtyurin A. N., Sidorov N. V.
Заглавие : Optical properties, structural homogeneity, and defect centers of double-doped LiNbO3:Zn:Mg single crystals obtained using different technologies
Колич.характеристики :13 с
Место публикации : Inorg. Mater.: Appl. Res. - 2025. - Vol. 16, Is. 2. - P.278-290. - ISSN 20751133 (ISSN), DOI 10.1134/S2075113324701648. - ISSN 2075115X (eISSN)
Примечания : Cited References: 60. - This work was carried out with partial financial support from the Government of the Murmansk Region for research projects of young scientists (no. 201 dated November 27, 2023) and within the framework of the state assignment of the Ministry of Science and Higher Education of the Russian Federation (registration number FMEZ-2025-0055)
Аннотация: Features of the defect structure of a nominally pure LiNbO3stoich crystal and double-doped LiNbO3:Zn:Mg (3.45:1.41 mol %) and LiNbO3:Zn:Mg (3.45:1.22 mol %) single crystals have been studied using Raman spectroscopy, infrared absorption spectroscopy, photoluminescence, laser conoscopy, and photoinduced light scattering. The material for the study has been obtained using homogeneous and direct doping technology. It has been shown that double-doped LiNbO3:Zn:Mg crystals obtained using different technologies have high resistance to damage by laser radiation. However, the LiNbO3:Zn:Mg (3.45:1.22 mol %) crystal obtained by direct doping technology is characterized by lower compositional uniformity compared to the LiNbO3:Zn:Mg (3.45:1.41 mol %) crystal obtained by homogeneous doping technology. Raman spectra have showed that the features of the defect structure of double-doped LiNbO3:Zn:Mg crystals are largely determined by the magnesium impurity. This may be the reason that the influence of the ordering mechanism of magnesium cations (~1.22–1.44 mol %) prevails over the influence of the disordering mechanism of zinc cations (~3.45 mol %) on the features of the structural units of the cation sublattice. It has been found that the lowest concentration of OH groups and photoluminescence intensity in the near-IR region is characteristic of the LiNbO3:Zn:Mg (3.45:1.41 mol %) crystal obtained by homogeneous doping technology.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sal'nikova E. I., Аndreev О. V., Molokeev M. S., Aleksandrovsky A. S., Biryukov D. Yu., Zatsepin D. A., Oreshonkov A. S., Glukhova P. О., Azarapin N. O., Shulaev N. А., Garipov D. A., Volkova S. S., Denisenko Yu. G.
Заглавие : Synthesis and electron dependent properties of the phosphor Gd2O2S:Ce3+, Tb3+
Колич.характеристики :9 с
Место публикации : ChemistrySelect. - 2025. - Vol. 10, Is. 23. - Ст.e00964. - ISSN 23656549 (eISSN), DOI 10.1002/slct.202500964
Примечания : Cited References: 53. - The study was carried out with the support of the Ministry of Science and Higher Education of the Russian Federation within the framework of the project “Fundamental problems of development methodology and related legal and ethical regulation in the field of application of artificial intelligence systems and models” (FEWZ-2024–0052). D.A. Zatsepin and D.Yu. Biryukov are grateful to the Ministry of Science and Higher Education of Russian Federation (FEUZ-2023–0014) for support. Yu. G. Denisenko, A.S. Aleksandrovsky, and A.S. Oreshonkov are grateful for support by ′′Priority- 2030′′ program for the Tyumen State University and Siberian Federal University, and the state assignment of Kirensky Institute of Physics (FWES-2024–0003). The results of UV spectroscopy were obtained using the equipment of the Center for Collective Use "Rational Nature Management and Physical-Chemical Research" of Tyumen State University
Аннотация: A substitutional solid solution of (Gd0.94Ce0.03Tb0.03)2O3 (Ia3, a = 10.8496 (5) A, V = 1277.1 (2) A3) was obtained by hydrothermal synthesis from rare earth nitrates and sodium hydroxide, followed by calcination in air at 900 °C for 2 h. The subsequent sulfidation of the compound in a hydrogen sulfide stream at 900 °C for 9 h yielded a substitutional solid solution of the oxysulfide (Gd0.94Ce0.03Tb0.03)2O2S (P3m1, a = 3.8682 (4) A, c = 6.6770 (8) A, V = 86.52 (2) A3). A qualitative and quantitative analysis of the obtained samples was carried out using the Rietveld method, along with morphological characterization of the particles. A mechanism for the transformation of particles at different stages of synthesis has been proposed. Combined experimental and theoretical investigations showed possibility of both direct and indirect electronic transitions in (Gd0.94Ce0.03Tb0.03)2O2S. Density functional theory calculations highlighted the complex nature of charge transfer in lanthanide oxysulfides, suggesting further investigations. The results of the study on the photoluminescent properties of the obtained phosphors showed that Tb3+ ions play a major role in the emission processes, with the most intense emission band occurring in the green spectral region at 538 nm. In addition to the narrow terbium bands, weak cerium emission was also observed, covering a broad spectral range of 350-700 nm.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gong Ch., Zhu H., Zhou Ch., Li Ya., Xi Yu., Molokeev M. S., Zolotov A., Zhou Zh., Xia M.
Заглавие : Highly efficient Fe3+-activated hexaaluminate phosphor with multisite luminescence and high thermal stability toward plant lighting
Колич.характеристики :8 с
Место публикации : J. Alloys Compd. - 2025. - Vol. 1031. - Ст.181052. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2025.181052. - ISSN 18734669 (eISSN)
Примечания : Cited References: 38. - The authors would like to gratefully acknowledge funds from the the Natural Science Foundation of Hunan Province, China (2023JJ40307, 2024JJ3019 and 2025JJ70278), 2024 Interdisciplinary Research Youth Guide Project of Hunan Agricultural University (2024XKJC11), the Hunan Provincial Innovation Foundation for Postgraduate (CX20240455), the Russian Science Foundation (Grant 24–43–00006) and the Furong Plan Province enterprise science and technology innovation and entrepreneurship team support project
Аннотация: Fe3+ activator is a NIR candidate due to its non-toxicity and low cost. Herein, a NIR phosphor BaZnAl10O17: Fe3+ (BZA: Fe3+) with high external quantum efficiency (EQE = 54.1 %) and excellent thermal stability is synthesized. Various emission spectra can be observed under three different excitation wavelengths, which is attributed to the occupation of Fe3+ on two octahedral sites and a tetrahedral site. The anti-thermal quenching phenomenon under the excitation wavelength of 340 nm can be attributed to trap-assisted energy compensation, weak electron-phonon coupling and energy transfer between different Fe3+ sites. These sparkling properties indicate application potential in the field of plant lighting.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Banerjee S., Saikia S., Molokeev M. S., Nag A.
Заглавие : Unveiling temperature-induced structural phase transition and luminescence in Mn2+-doped Cs2NaBiCl6 double perovskite
Колич.характеристики :8 с
Место публикации : Chem. Mater. - 2024. - Vol. 36, Is. 9. - P.4750-4757. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.4c00514. - ISSN 15205002 (eISSN)
Примечания : Cited References: 49. - Authors acknowledge Dr. Arup Rath’s lab NCL Pune and SAIF-IIT Bombay for diffuse reflectance spectroscopy and ICP-AES measurements, respectively. A.N. acknowledges Science & Engineering Research Board, India, for Swarnajayanti Fellowship (SB/SJF/2020-21/02), and BRICS grant (e-27558) of the Department of Science and Technology, India. Authors acknowledge the Department of Science and Technology India (FIST program, SR/FST/CS-II/2019/105) for temperature-dependent powder XRD and EPR data. S.B. is grateful to IISER Pune for a research fellowship. S.S. acknowledges Prime Minister’s Research Fellowship (PMRF), Ministry of Education, India. M.M. acknowledges the Russian Science Foundation, grant 24-43-00006
Аннотация: Halide double perovskites like Cs2NaBiCl6 are good host materials for luminescent dopants like Mn2+. The nature of photoluminescence (PL) depends on the local structure around the dopant ion, and doping may sometimes influence the global structure of the host. Here, we unveil the correlation between the temperature-induced (global) structural phase transition of Mn2+-doped Cs2NaBiCl6 with the local structure and PL of the Mn2+ dopant. X-ray diffraction analysis shows Mn2+-doped Cs2NaBiCl6 is in a cubic (Fm3m) phase between 300 and 110 K, below which the phase changes to tetragonal (I4/mmm), which persists at least until 15 K. The small (∼1%) doping amount does not alter the phase transition behavior of Cs2NaBiCl6. Importantly, the phase transition does not influence the Mn2+ d-electron PL. The PL peak energy, intensity, spectral width, and lifetime do not show any signature of the phase transition between 300–6 K. The hyperfine splitting in temperature-dependent electron paramagnetic spectra of Mn2+ ions also remain unchanged across the phase transition. These results suggest that the global structural phase transition of the host does not influence the local structure and emission property of the dopant Mn2+ ion. This structure–property insight might be explored for other transition-metal- and lanthanide-doped halide double perovskites as well. The stability of dopant emission regardless of the structural phase transition bodes well for their potential applications in phosphor-converted light emitting diodes.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Su B., Molokeev M. S., Chen R., Zhang T.
Заглавие : Near-unity PLQY and high anti-thermal quenching red luminescence from one-dimensional hybrid manganese chloride for efficient and stable white light-emitting diodes
Колич.характеристики :8 с
Место публикации : J. Mater. Chem. C. - 2024. - Vol. 12, Is. 25. - P.9266-9273. - ISSN 20507526 (ISSN), DOI 10.1039/D4TC01477D. - ISSN 20507534 (eISSN)
Примечания : Cited References: 47. - The present work was supported by the National Science Foundation Committee of China (62105194), the Key Research and Development Program of Shaanxi Province, China (2024GX-YBXM-409), and the Russian Science Foundation, grant 24-43-00006
Аннотация: The discovery of novel Mn2+-based metal halides with excellent luminescence properties and thermostability is particularly of great importance for solid-state lighting (SSL). Herein, a novel one-dimensional hybrid manganese chloride (TMA)MnCl3 of a hexagonal system with a P63/m space group is synthesized via a simple saturation crystallization method. Under 443 nm excitation, (TMA)MnCl3 single crystals exhibit a strong broad-band red emission peak at 645 nm originating from the 4T1 → 6A1 transition of Mn2+ ions with a full width at half maximum of 99 nm and a photoluminescence quantum yield (PLQY) of 98.6%. Moreover, (TMA)MnCl3 shows a high anti-thermal quenching behavior, and the integrated PL intensity still retains 100% of the initial intensity measured at 300 °C, caused by the high structural rigidity. Benefiting from its strong blue light excitation, high PLQY, and excellent thermal stability, a stable white light-emitting diode device is fabricated by combining a 465 nm blue LED chip, green-emitting Lu3Al5O12:Ce3+ and the (TMA)MnCl3 red phosphor with a high color rendering index of 94.3% and a correlated color temperature of 3995 K. This work develops a novel hybrid manganese chloride red-emitter and paves a new path to explore high-performance phosphors excited by blue light for SSL.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou G., Wang Y., Mao Y., Guo C., Zhang J., Molokeev M. S., Xia Z., Zhang X.-M.
Заглавие : Temperature/component-dependent luminescence in lead-free hybrid metal halides for temperature sensor and anti-counterfeiting
Колич.характеристики :9 с
Место публикации : Adv. Funct. Mater. - 2024. - Vol. 34, Is. 34. - Ст.2401860. - ISSN 1616301X (ISSN), DOI 10.1002/adfm.202401860. - ISSN 16163028 (eISSN)
Примечания : Cited References: 89. - G.J.Z. and Y.T.W. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (No.52202177, 22271211), Fundamental Research Program of Shanxi Province (No.20210302124054), Science and Technology Innovation Project of Colleges and Universities in Shanxi Province (No.2021L262), 1331 Project of Shanxi Province, Postgraduate Innovation Project of Shanxi Province (No.2023KY462), and supported by the Ministry of Science and High Education of Russian Federation (No.FSRZ-2023-0006). The authors would like to thank Prof. Haijun Jiao, Leibniz-Institut für Katalyse e.V., Germany, for the theoretical support on the electron-transition mechanism
Аннотация: Hybrid metal halides (HMHs) have emerged as a promising platform for optically functional crystalline materials, but it is extremely challenging to thoroughly elucidate the electron transition coupled to additional ligand emission. Herein, to discover sequences of lead-free HMHs with distinct optically active metal cations are aimed, that is, Sb3+ (5s2) with the lone-pair electron configuration and In3+ (4d10) with the fully-filled electron configuration. (Me2NH2)4MCl6·Cl (Me = −CH3, M = Sb, In) exhibits the superior temperature/component-dependent luminescence behaviors resulting from the competition transition between triplet-states (Tn-S0) self-trapped excitons (STEs) of inorganic units and singlet-state (S1-S0) of organic cations, which is manipulated by the optical activity levels of [SbCl6]3− and [InCl6]3−. The bonding differences between Sb3+/In3+ and Cl− in terms of electronic excitation and hybridization are emphasized, and the different electron-transition mechanisms are established according to the PL spectra at the extreme temperature of 5 to 305 K and theoretical calculations. By fine-tuning the B-site Sb3+/In3+ alloying, the photoluminescence quantum yield (PLQY = 81.5%) and stability are optimized at 20% alloying of Sb3+. This research sheds light on the rules governing PL behaviors of HMHs, as well as exploring the optical-functional application of aviation temperature sensors and access-control systems.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ma Y., Liao W., Quan B., Kong Z., Molokeev M. S., Zolotov A., Cheng M., Chen X., Zhou Zh., Xia M.
Заглавие : Solid solution structural engineering enhances the luminescence of SrMgAl10O17:Cr3+ for agricultural lighting
Колич.характеристики :7 с
Место публикации : J. Lumin. - 2024. - Vol. 270. - Ст.120553. - ISSN 00222313 (ISSN), DOI 10.1016/j.jlumin.2024.120553. - ISSN 18727883 (eISSN)
Примечания : Cited References: 46. - The authors would like to gratefully acknowledge funds from the Key R & D Projects in Hunan Province (2021SK2047, 2022NK2044), the Wangcheng Science and Technology Plan (KJ221017), the Science and Technology Innovation Program of Hunan Province (2022WZ1022). The work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of the World-class Research Center program: ‘‘Advanced Digital Technologies’’, contract no. 075-15-2020-935. Research Foundation of Education Bureau of Hunan Province, China (22B0211)
Аннотация: Lead-free non-rare earth oxide phosphors have attracted wide attention due to their environmental protection, sustainability, and potential to replace halides and fluorides in the field of plant lighting. Among them, the Cr3+-excited aluminate phosphor exhibits high brightness, high thermal stability, and far red to near-infrared (NIR) emission due to the influence of the crystal field strength (CFS). This property gives rise to a variety of strategies used to modulate the CFS, for example, single ion substitution, chemical unit co-substitution, etc. Here, we chose the substitution of a single ion, with [BaO6] gradually replacing [SrO6] to form a solid solution. Their structural characteristics and the local structure of Cr3+ are studied and discussed. The device is packaged to evaluate the feasibility of the material for practical application. The prepared phosphor had a bright far-red light emission of 693 nm under blue light excitation, and this spectrum strongly matched the absorption of plant phytochrome PFR. This work provides the design principle of far red light emission activated by Cr3+ aluminate solid solution, which can inspire further research on pc-LED lights for plant lighting.
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11.

Вид документа : Статья из журнала
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Автор(ы) : Oreshonkov A. S., Aleksandrovsky A. S., Chimitova O.D., Pankin D.V., Popov Z.I., Sukhanova E.V., Molokeev M. S., Adichtchev S.V., Pugachev A.M., Nemtsev I. V.
Заглавие : Solid state synthesis, structural, DFT and spectroscopic analysis of EuAl3(BO3)4
Колич.характеристики :10 с
Место публикации : Mater. Chem. Phys. - 2024. - Vol. 320. - Ст.129400. - ISSN 02540584 (ISSN), DOI 10.1016/j.matchemphys.2024.129400. - ISSN 18793312 (eISSN)
Примечания : Cited References: 55. - The work was carried out within the state assignment No FWES-2024-0003 of Kirensky Institute of Physics. This work was partially supported by the state order of BINM SB RAS (0273-2021-0008). The samples for this research were synthesized using equipment of the CCU BINM SB RAS. The reflectance spectrum was obtained at the Center for Optical and Laser Materials Research of Research park of St. Petersburg State University. The SEM measurements were performed at Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS"
Аннотация: Huntite-like borates are versatile and promising materials with wide range of applications in frequency conversion, UV light generation, lighting, displays, quantum information storage, and more, demonstrated by their various properties and uses in scientific research. In this work, EuAl3(BO3)4 powder was prepared through multi-stage solid-state reaction method using high-purity starting reagents: Eu2O3, Al2O3 and H3BO3, considering a 20 wt% excess of H3BO3 to compensate for B2O3 volatilization. Obtained samples undergo several treatments at varying temperatures and their phase purity is subsequently verified through powder X-ray diffraction analysis. The scanning electron microscopy reveals that resulting EuAl3(BO3)4 powder consists of granules exhibiting irregular morphologies with dimensions of 0.5–8 μm. The electronic band structure of EuAl3(BO3)4, calculated using the GGA PBE method, reveals f-states of Eu near 4 eV. These states do not produce emphasized peaks on simulated absorbance spectra. Using of DFT + U for the f-states of Eu pushed up f-bands above 6 eV and the charge transfer from p-O to d-Eu was obtained (Egdirect = 5.63 eV, Egindirect = 5.37 eV using Ueff = 4 eV). The variation of Ueff has a weak influence on the position of the bottom of the conduction band. The experimental bandgaps of EuAl3(BO3)4 crystalline powder, both direct and indirect, are found to be 3.96 and 3.67 eV, correspondingly. These values are lower than theoretical values what is associated with limitations of DFT calculations involving f electrons. The Raman spectrum of EuAl3(BO3)4 powder is discussed, detailing the contributions of different ions to specific spectral bands. Investigation of high-resolution luminescence spectra shows the possibility to estimate the content of defects by the testing the violation of the prohibition of ultranarrow 5D0 → 7F0 line that is forbidden in the ideal crystalline structure of trigonal EuAl3(BO3)4.
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12.

Вид документа : Статья из журнала
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Автор(ы) : Kolesnik O. V., Grabovoy A. S., Badun G. A., Churilov G. N., Kudryasheva N. S.
Заглавие : Radioprotective properties of fullerenol: Cellular, biochemical and physicochemical approaches
Колич.характеристики :10 с
Место публикации : Eurasian J. Chem. - 2024. - Vol. 29, Is. 3 (115), Section: Nano- and photo- catalysis in current chemistry: Possibilities and challenges. - P.72-81. - ISSN 29590663 (ISSN), DOI 10.31489/2959-0663/3-24-9. - ISSN 29590671 (eISSN)
Примечания : Cited References: 65. - This research was funded by the Russian Science Foundation No. 23-26-10018, Krasnoyarsk Regional Science Foundation. The purification of enzymes was supported by the State Assignment of the Ministry of Science and Higher Education of the Russian Federation, project No. FWES-2024-0018
Аннотация: The search for optimal radioprotective methods and tools under low-dose radiation exposures represents a pressing issue in the field of modern radioecology. The objective of the study was to investigate the radioprotective properties of fullerenol C60,70Oy(OH)x, (x+y = 24–28), a water-soluble polyhydroxylated fullerene derivative with an electron-deficient aromatic carbon structure. Tritium, a radionuclide of low decay energy, was selected to simulate an exposure to low-dose irradiation (˂ 0.05 Gy). We applied luminous marine bacteria Photobacterium phosporeum as a model cellular object to monitor radiation bioeffects; the bioluminescence intensity of the bacteria was used as a tested biological parameter. Tritium activated the bacterial luminescence; the addition of fullerenol (˂ 3∙10–3 g/L) “mitigated” the activation, thus revealing the radioprotective capacity of fullerenol for the marine microorganism. To evaluate the mechanisms of radioprotection of fullerenol in tritiated water, we investigated the effects of fullerenol on: (1) the content of reactive oxygen species and (2) the intensity of bioluminescence in the bacterial enzymatic reaction. Tritiated water produced moderate deviations from the control values, whereas the addition of fullerene brought these values closer to the ‘control’ ones. All observed effects were attributed to variations in the ionic balance of the aqueous medium, which resulted in the activation of bacterial functions through cell membranes.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Парфенова Е. В., Слюсаренко Н. В., Кулагин С. В., Рогова А. В., Томилин, Феликс Николаевич, Слюсарева Е. А.
Заглавие : Фотофизические свойства люминофоров на основе 3-(1,3-бензотиазол‑2-ил)-4-гидроксибензолсульфокислоты
Колич.характеристики :7 с
Место публикации : Изв. РАН. Сер. физич. - 2024. - Т. 88, № 6. - С. 960-966. - ISSN 03676765 (ISSN), DOI 10.31857/S0367676524060182
Примечания : Библиогр.: 25. - Работа выполнена при поддержке программы "Приоритет 2030", проект "Создание новых люминесцентных материалов полифункционального назначения" и Совета по грантам Президента РФ (проект № МК-995.2022.1.2)
Аннотация: Водорастворимые органические люминофоры на основе 3-(1,3-бензотиазол-2-ил)-4-гидроксибензол-сульфокислоты впервые исследованы экспериментально и с применением расчетов методами функционала плотности. Из-за различия в химической структуре, для одного из люминофоров наблюдается большой стоксов сдвиг, возникающий в результате внутримолекулярного переноса протона в возбужденном состоянии.Water-soluble organic phosphors based on 3-(1,3-benzothiazol-2-yl)-4-hydroxybenzene sulphonic acid were first studied experimentally and by density functional theory. The phosphors have differences in chemical structure. For one of them there is a large Stokes shift that results from intramolecular proton transfer in the excited state.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Титов Р. А., Смирнов М. В., Сидоров Н. В., Палатников М. Н., Крылов, Александр Сергеевич, Втюрин, Александр Николаевич
Заглавие : Структурная однородность боросодержащего кристалла ниобата лития
Колич.характеристики :8 с
Место публикации : Труды Кольского научн. центра РАН. Сер. технич. науки. - 2024. - Т. 15, № 1. - С. 395-402. - ISSN 29491215 (ISSN), DOI 10.37614/2949-1215.2024.15.1.065; Trans. Kola Sci. Centre RAS. Ser. Eng. Sci.
Примечания : Библиогр.: 18. - Государственное задание по теме НИР № FMEZ-2022-0016
Аннотация: Методами спектроскопии комбинационного рассеяния света и фотолюминесценции исследована структурная однородность монокристаллической були LiNbO3:B (0,83 мол. % B2O3 в шихте). Обнаружено, что вырезанные из разных частей боросодержащей були параллелепипеды LiNbO3:B (1 и 2) обладают близкой стехиометрией, приближенной к 1. Наличие поляронной люминесценции в ближней ИК-области спектра подтверждает отличие состава кристалла LiNbO3:B (2) от строго стехиометрического состава.The structural uniformity of a single-crystal LiNbO3:B (0.83 mol. % B2O3 in the charge) boule was studied by Raman spectroscopy and photoluminescence. It was found that LiNbO3:B (1 and 2) parallelepipeds cutting from different parts of a boron-containing boule had stoichiometry, close to 1. The presence of polaron luminescence in the near IR region of the spectrum confirms the difference in the composition of the LiNbO3:B (2) crystal from the strictly stoichiometric composition.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Титов Р. А., Смирнов М. В., Бобрева Л. А., Теплякова Н. А., Палатников М. Н., Бирюкова И. В., Маслобоева С. М., Крылов, Александр Сергеевич, Втюрин, Александр Николаевич, Сидоров Н. В.
Заглавие : Оптические свойства, структурная однородность и дефектные центры монокристаллов двойного легирования LiNbO3:Zn:Mg, полученных по разным технологиям
Колич.характеристики :18 с
Место публикации : Перспективн. материалы. - 2024. - № 8. - С. 5-22. - ISSN 1028978X (ISSN), DOI 10.30791/1028-978X-2024-8-5-22
Примечания : Библиогр.: 60. - Работа выполнена при частичной финансовой поддержке правительства Мурманской области научно-исследовательских проектов молодых учёных (№ 201 от 27 ноября 2023 г.) и в рамках государственного задания Министерства науки и высшего образования РФ (регистрационный номер FMEZ-2022-0016)
Аннотация: Методами спектроскопии комбинационного рассеяния света, инфракрасной спектроскопии поглощения, фотолюминесценции, лазерной коноскопии и фотоиндуцированного рассеяния света исследованы особенности дефектной структуры номинально чистого кристалла LiNbO3стех и монокристаллов двойного легирования LiNbO3:Zn:Mg (3,45:1,41 мол. %) и LiNbO3:Zn:Mg (3,45:1,22 мол. %), полученных по технологии гомогенного и прямого легирования. Кристаллы двойного легирования LiNbO3:Zn:Mg, полученные по разным технологиям, обладают высоким сопротивлением повреждению лазерным излучением. Кристалл LiNbO3:Zn:Mg (3,45:1,22 мол. %), полученный по технологии прямого легирования, характеризуется более низкой композиционной однородностью по сравнению с кристаллом LiNbO3:Zn:Mg (3,45:1,41 мол. %), полученным по технологии гомогенного легирования. По спектрам комбинационного рассеяния света обнаружено, что особенности дефектной структуры кристаллов двойного легирования LiNbO3:Zn:Mg в большей степени определяет примесь магния. Обнаруженный факт может быть причиной преобладания влияния упорядочивающего механизма катионов магния (~ 1,22 – 1,44 мол. %) над влиянием разупорядочивающего механизма катионов цинка (~ 3,45 мол. %) на особенности структурных единиц катионной подрешетки. Наименьшее значение концентрации ОН-групп и интенсивности фотолюминесценции в ближней ИК области характерно для кристалла LiNbO3:Zn:Mg (3,45:1,41 мол. %), полученного по технологии гомогенного легирования.Features of the defect structure of a nominally pure LiNbO3stoich crystal and doubly doped LiNbO3:Zn:Mg (3.45:1.41 mol. %) and LiNbO3:Zn:Mg (3.45:1.22 mol. %) single crystals have been studied using Raman spectroscopy, infrared absorption spectroscopy, photoluminescence, laser conoscopy and photoinduced light scattering. The material for the study has been obtained using homogeneous and direct doping technology. It has been shown that double-doped LiNbO3:Zn:Mg crystals obtained using different technologies have high resistance to damage by laser radiation. However, the LiNbO3:Zn:Mg (3.45:1.22 mol. %) crystal obtained using direct doping technology is characterized by lower compositional uniformity compared to the LiNbO3:Zn:Mg (3.45:1.41 mol. %) crystal obtained using homogeneous doping technology. Raman spectra have showed that the features of the defect structure of double-doped LiNbO3:Zn:Mg crystals are largely determined by the magnesium impurity. This may be the reason that the influence of the ordering mechanism of magnesium cations (~ 1.22 – 1.44 mol. %) prevails over the influence of the disordering mechanism of zinc cations (~ 3.45 mol. %) on the features of the structural units of the cation sublattice. It has been found that the lowest concentration of OH groups and photoluminescence intensity in the near-IR region is characteristic of the LiNbO3:Zn:Mg (3.45:1.41 mol. %) crystal obtained using homogeneous doping technology.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parfenova E. V., Slyusarenko N. V., Kulagin S. V., Rogova A. V., Tomilin F. N., Slyusareva E. A.
Заглавие : Photophysical properties of luminophores based on 3-(1,3-benzothiazol-2-yl)-4-hydroxybenzenesulfonic acid
Колич.характеристики :6 с
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2024. - Vol. 88, Is. 6. - P.940-945. - ISSN 10628738 (ISSN), DOI 10.1134/S1062873824706858. - ISSN 19349432 (eISSN)
Примечания : Cited References: 25. - The authors are grateful to OLBO Company for the presented samplesThe work was supported by the Priority 2030 Program, the project "Design of New Luminescent Materials for Multifunctional Purposes", and the Grant Council of the President of the Russian Federation (project no. MK-995.2022.1.2)
Аннотация: Water-soluble organic luminophores based on 3-(1,3-benzothiazol-2-yl)-4-hydroxybenzenesulfonic acid were studied both experimentally and by density functional theory for the first time. Because of peculiarities in chemical structure, one of them has a large Stokes shift, which results from excited state intramolecular proton transfer.
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17.

Вид документа : Статья из журнала
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Автор(ы) : Chen H., Zhang Z., Mi R., Molokeev M. S., Liu Yu., Wang B., Mei L., Fang M., Wu X., Min X., Liu Ya.
Заглавие : Synergetic manipulation of components and multiple activator sites towards full-spectrum lighting in Eu2+-doped whitlockite phosphors for high color-rendering WLED
Колич.характеристики :9 с
Место публикации : J. Lumin. - 2024. - Vol. 275. - Ст.120795. - ISSN 00222313 (ISSN), DOI 10.1016/j.jlumin.2024.120795. - ISSN 18727883 (eISSN)
Примечания : Cited References: 47. - We acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 52104272 and 52072348), the Young Elite Scientists Sponsorship Program by CAST (2024QNRC001) and the Program National Key R&D Program of China (2021YFC1910602-01)
Аннотация: Tuning the components and multiple activator sites possesses profound significances on the regulation for corresponding luminescent properties of target phosphors. However, it is still challenging to realize full-visible emission via single activator in a single phase owing to the matrix diversity and uncertainty for multi-site occupation. Herein, we developed a family of whitlockite-type solid-solution phosphors Ca8MgGa1-yLay(PO4)7: Eu2+(y = 0–1) via inducing the La3+ ions into Ca8MgGa(PO4)7:Eu2+. The local environments of Eu2+ ions and corresponding tunable photoluminescent properties, decay times and thermal stability are revealed systematically in detail. Specially, the excitation and emission spectra of Ca8MgGa1-yLay(PO4)7: Eu2+ are broadened gradually, finally towards a full-visible emission with 152 nm bandwidth spectrum for the phosphor Ca8MgLa(PO4)7: Eu2+. WLED with a high color rendering index (CRI = 95) and low color temperature (CCT = 3764 K) was fabricated based on the full-visible emission Ca8MgGa0.2La0.8(PO4)7: 0.08Eu2+ phosphors under a 365 nm chip, indicating the prominent potentials for high-color-rendering WLEDs. These results in current work provide new ideas for synergetic manipulation of components and multiple activator sites towards a full-visible emission in single-phase applied for white lighting.
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18.

Вид документа : Статья из журнала
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Автор(ы) : Liu Sh., Li L., Qin X., Du R., Sun Y., Xie Sh., Wang J., Molokeev M. S., Xi Sh., Bunzli J.-C. G., Zhou L., Wu M.
Заглавие : Achieving ultra-broadband sunlight-like emission in single-phase phosphors: The interplay of structure and luminescence
Колич.характеристики :9 с
Место публикации : Adv. Mater. - 2024. - Vol. 36, Is. 38. - Ст.2406164. - ISSN 09359648 (ISSN), DOI 10.1002/adma.202406164. - ISSN 15214095 (eISSN)
Примечания : Cited References: 43. - S.L. and L.L. contributed equally to this work. This work was ﬁnancially supported by grants from the National Natural Science Foundationof China (NSFC, No. 52272174) and its joint project with Guangdong(Nos. U22A20135, U1801253 and U1301242) Province. J. Wang acknowl-edges Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) projects SML2021SP204, SML2023SP215/218/238. The authorsare grateful to Prof. Peter A. Tanner and Prof. Ka-Leung Wong for the indepth communication and valuable advice on the improvement of the manuscriptOpen access funding provided by Ecole Polytechnique Federale de Lausanne
Аннотация: The quest for artificial light sources mimicking sunlight has been a long-standing endeavor, particularly for applications in anticounterfeiting, agriculture, and color hue detection. Conventional sunlight simulators are often cost-prohibitive and bulky. Therefore, the development of a series of single-phase phosphors Ca9LiMg1-xAl2x/3(PO4)7:0.1Eu2+ (x = 0-0.75) with sunlight-like emission represents a welcome step towards compact and economical light source alternatives. The phosphors are obtained by an original heterovalent substitution method and emit a broad spectrum spanning from violet to deep red. Notably, the phosphor with x = 0.5 exhibits an impressive full width at half-maximum of 330 nm. A synergistic interplay of experimental investigations and theory unveils the mechanism behind sunlight-like emission due to the local structural perturbations introduced by the heterovalent substitution of Al3+ for Mg2+, leading to a varied distribution of Eu2+ within the lattice. Subsequent characterization of a series of organic dyes combining absorption spectroscopy with convolutional neural network analysis convincingly demonstrates the potential of this phosphor in portable photodetection devices. Broad-spectrum light source testing empowers the model to precisely differentiate dye patterns. This points to the phosphor being ideal for mimicking sunlight. Beyond this demonstrated application, the phosphor's utility is envisioned in other relevant domains, including visible light communication and smart agriculture.
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19.

Вид документа : Статья из журнала
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Автор(ы) : Wang, Xuejiao, Feng, Xiaowen, Molokeev M. S., Zheng, Huiling, Wang, Qiushi, Xu, Chunyan, Li, Ji-Guang
Заглавие : Modulation of Bi3+ luminescence from broadband green to broadband deep red in Lu2WO6 by Gd3+ doping and its applications in high color rendering index white LED and near-infrared LED
Место публикации : Dalton Trans. - 2023. - Vol. 52, Is. 9. - P.2619-2630. - ISSN 14779226 (ISSN), DOI 10.1039/D2DT03751C. - ISSN 14779234 (eISSN)
Примечания : Cited References: 4. - This work is supported in part by the Project of Education Department of Liaoning Province (Grant No. LQ2019014) and he Natural Science Foundation of Liaoning Province (Grant No. 2020-MS-286). The authors are thankful for the support for the 4B9A Beamline from the Beijing Synchrotron Radiation Facility (BSRF) (Project No. 2021-BEPC-PT-005290). The authors would like to thank Siqi Liu from Shiyanjia Lab (
Аннотация: Phosphors that exhibit tunable broadband emissions are highly desired in multi-functional LEDs, including pc-WLEDs and pc-NIR LEDs. In this work, broadband emissions were obtained and modulated in the unexpectedly wide spectral range of 517–609 nm for (Lu0.99−xGdxBi0.01)2WO6 phosphors by tuning the Gd3+ content (x = 0–0.99). The effects of Gd3+ doping on phase constituents, particle morphology, crystal structure, and photoluminescence were systematically investigated. Broadband green emission was obtained from Gd3+-free (Lu0.99Bi0.01)2WO6 phosphors (x = 0), whose emission intensity was enhanced by 50% with 5 at% Gd3+ (x = 0.05). The phase transition happened when x 0.50 and the broadband red-NIR emission was obtained when x = 0.75–0.99. Three luminescence centers were proved to be responsible for the broadband green emissions via crystal structure, spectral fitting and fluorescence decay analysis. A pc-WLED with a high color rendering index (Ra = 91.3), a stable emission color, and a low color temperature (3951 K) was fabricated from the (Lu0.94Gd0.05Bi0.01)2WO6 broadband green phosphor, and an LED device that simultaneously emits high color rendering index white light and NIR light was obtained with the (Gd0.99Bi0.01)2WO6 broadband red-NIR phosphor. Night vision and noninvasive imaging were also demonstrated using the latter LED device.
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20.

Вид документа : Статья из журнала
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Автор(ы) : Lyu, Kuangnan, Liu, Gaochao, Molokeev M. S., Xia, Zhiguo
Заглавие : Double-site occupation triggered broadband and tunable NIR-I and NIR-II luminescence in AlNbO4:Cr3+ phosphors
Место публикации : Adv. Phys. Res. - 2023. - Vol. 2, Is. 4. - Ст.2200056. - ISSN 27511200 (eISSN), DOI 10.1002/apxr.202200056
Примечания : Cited References: 38. - This research was supported by the International Cooperation Project of the National Key Research and Development Program of China (2021YFB3500400 and 2021YFE0105700), National Natural Science Foundations of China (Grant No. 51972118), Guangzhou Science & Technology Project (202007020005), the State Key Laboratory of Luminescent Materials and Devices (Skllmd-2022-02), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01×137). This work was also funded by RFBR according to the research project No. 19-52-80003
Аннотация: Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are desired for optoelectronic and biomedical applications, while the development of target broadband NIR phosphors still remains a significant challenge. Herein, a kind of Cr3+-doped AlNbO4 phosphors with a broad NIR emission ranging from 650 to 1400 nm under 450 nm excitation are reported. A giant red-shift emission peak from 866 to 1020 nm together with broadened full width at half-maximum of 320 nm is achieved simply by varying the doped Cr3+ concentrations. Structural and spectroscopy analysis demonstrate that a concentration-dependent site-occupation of Cr3+ emitters in different Al3+ sites is responsible for the tunable NIR luminescence. The as-fabricated NIR pc-LED based on optimized AlNbO4:Cr3+ phosphor exhibits great potential in night-vision applications. This work provides a novel design principle on the Cr3+-doped AlNbO4 phosphor with tunable broadband luminescence from NIR-I to NIR-II, and these materials can be employed in NIR spectroscopy applications.
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